CA2383524C - Thiazolyl alkynyl compounds and methods of use thereof - Google Patents
Thiazolyl alkynyl compounds and methods of use thereof Download PDFInfo
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Abstract
In accordance with the present invention, there are provided novel class of heterocyclic compounds and methods of use thereof. Compounds of the invention contain a substituted, unsaturated five, six or seven membered heterocyclic ring that includes at least one nitrogen atom and at least one carbon atom. At a ring position adjacent to a ring nitrogen atom, the heterocyclic ring has at least one substituent which includes a moiety, linked to the heterocyclic ring via an alkylene moiety, an alkynylene moiety or an azo group. Invention compounds are capable of a wide variety of uses including modulating physiological processes by functioning as agonists and antagonists of receptors in the nervous system, as insecticides, and as fungicides. The invention further provides methods of modulating the activity of excitatory amino acid receptors using a specifically defined class of heterocyclic compounds including the novel compounds referred to above. In one embodiment, there are provided methods of modulating metabotropic glutamate receptors. The present invention also discloses methods of treating disease using heterocyclic compounds.
The invention further discloses methods of preventing disease conditions related to diseases of the pulmonary system, diseases of the nervous system, diseases of the cardiovascular system, diseases of the gastrointestinal system, diseases of the endocrine system, diseases of the exocrine system, diseases of the skin, cancer and diseases of the ophthalmic system. The invention also discloses pharmaceutically acceptable salt forms of the above-described heterocyclic compounds.
The invention further discloses methods of preventing disease conditions related to diseases of the pulmonary system, diseases of the nervous system, diseases of the cardiovascular system, diseases of the gastrointestinal system, diseases of the endocrine system, diseases of the exocrine system, diseases of the skin, cancer and diseases of the ophthalmic system. The invention also discloses pharmaceutically acceptable salt forms of the above-described heterocyclic compounds.
Description
THIAZOLYL ALKYNYL COMPOUNDS AND METHODS OF USE THEREOF
FIELD OF INVENTION
The present invention relates to novel heterocyclic compounds which contain a heterocylic ring bearing at least one substituent attached by a linker containing an acetylenic group, a vinylic group or an azo group. In addition, the present invention relates to therapeutic methods of use of heterocyclic compounds for the treatment and prevention of various disease conditions.
BACKGROUND OF THE INVENTION
Unsaturated heterocylic compounds fmd a wide variety of uses. -For example, compounds of this class fmd uses as modulators of physiological processes that are mediated by ligand-activated receptors. Receptors that are activated by ligands are located throughout the nervous, cardiac, renal, digestive and bronchial systems, among others. Therefore, in the nervous system, for example, heterocyclic compounds are capable of functioning as agonists or antagonists of receptors for neurotransmitters, neurohormones and neuromodulators. Ligand-activated receptors have been identified in a wide variety of species, -including humans, other mammals and vertebrates as well as in invertebrate species. Therefore, compounds of this class are also able to modulate receptor-mediated processes throughout phylogeny and find uses in a wide variety of applications, e.g., as pharmaceuticals, insecticides and fungicides.
Receptors activated by excitatory amino acids, such as the amino acid L-glutamic acid (glutamate), are a major excitatory neurotransmitter receptor class in the mammalian central nervous system.
Anatomical, biochemical and electrophysiological analyses suggest that glutamatergic systems are involved in a broad array of neuronal processes, including fast excitatory synaptic transmission, regulation of neurotransmitter release, long-term potentiation, long-term depression, learning and memory, developmental synaptic plasticity, hypoxic-ischemic damage and neuronal cell death, epileptiform seizures, visual processing, as well as the pathogenesis of several neurodegenerative disorders. See generally, Nakanishi et al., Brain Research Reviews 20:230-235 (1998); Monaghan et al, Am Rev. PharmacoZ
Toxicol. 29:365-402 (1980). This extensive repertoire of functions, especially those related to learning, neurotoxicity, and neuropathology, has stimulated recent attempts to describe and define the mechanisms through which glutamate exerts its effects.
Glutamate has been observed to mediate its effects through receptors that have been categorized into two main groups: ionotropic and metabotropic. Metabotropic glutamate receptors are divided into three groups based on amino acid sequence homology, transduction mechanism and pharmacological properties, namely Group I, Group II and Group III. Each Group of receptors contains one or more types of receptors. For example, Group I includes metabotropic glutamate receptors 1 and 5 (mG1uR1 and mGluR5), Group II includes metabotropic glutamate receptors 2 and 3 (mGluR2 and mGluR3) and Group III includes metabotropic glutamate receptors 4, 6, 7 and 8 (mGluR4, mGluR6, mGluR7 and mGluR8). Several subtypes of a mGluR type may exist. For example, subtypes of mGluRl include mGluRla, mGluRlb, mGluRlc and mGluRld.
Anatomical studies demonstrate a broad and selective distribution of metabotropic glutamate receptors in the mammalian nervous system. For example, mGluRl is expressed in the cerebellum, olfactory bulb, hippocampus, lateral septum, thalamus, globus pallidus, entopeduncular nucleus, ventral pallidum and substantia nigra (Petralia et al., (1997) J. Chem. Neuroanat., 13:77-93; Shigemoto et al., (1992) J. Comp. Neurol., 322:121-135). In contrast, mGluR5 is weakly expressed in the cerebellum, while higher levels of expression are found in the striatum and cortex (Romano et al., (1995) J. Comp.
Neurol., 355:455-469). In the hippocampus, mGluR5 appears widely distributed and is diffusely expressed.
Metabotropic glutamate receptors are typically characterized by seven putative transmembrane domains, preceded by a large putative extracellular amino-terminal domain and followed by a large putative intracelluar carboxy-terminal domain. The receptors couple to G-proteins and activate certain second messengers depending on the receptor group. Thus, for example, Group I
mGluRs activate phospholipase C. Activation of the receptors results in the hydrolysis of membrane phosphatidylinositol (4,5)-bisphosphate to diacylglycerol, which activates protein kinase C, and inositol trisphosphate, which in turn activates the inositol trisphosphate receptor to promote the release of intracellular calcium.
Ionotropic glutamate receptors are generally divided into two classes: the N-methyl-D-aspartate (NMDA) and non-NMDA receptors. Both classes of receptors are linked to integral cation channels and share some amino acid sequence homology. G1uR1-4 are termed AMPA (a-amino-3-hydroxy-5-methylisoxazole-4-propionic acid) receptors because AMPA preferentially activates receptors composed of these subunits, while GIuR5-7 and KA1-2 are termed kainate receptors as these are preferentially sensitive to kainic acid. Thus, an "AMPA receptor" is a non-NMDA receptor that can be activated by AMPA. AMPA receptors include the GluR1-4 family, which form homo-oligomeric and hetero-oligomeric complexes which display different current-voltage relations and calcium permeability. Polypeptides encoded by G1uR1-4 nucleic acid sequences can form functional ligand-gated ion channels. An AMPA receptor includes a receptor having a GluRl, G1uR2, GluR3 and/or G1uR4 subunit. A NMDA receptor includes a receptor having NMDARI, NMDAR2a, NMDAR2b, NMDAR2c, NMDAR2d and/or NMDAR3 subunits.
Because of the physiological and pathological significance of excitatory amino acid receptors generally and metabotropic glutamate receptors, in particular, there is a need to identify methods of modulating excitatory amino acid receptor-mediated processes, as well as therapeutic methods of treatment and methods for prevention of diseases. Also, there is a continuing need in the art for new members of a compound class that can modulate excitatory amino acid receptors.
The present invention satisfies these and related needs.
BRIEF DESCRIPTION OF THE INVENTION
In accordance with the present invention, there is provided a novel class of heterocyclic compounds. Compounds of the invention contain a substituted, unsaturated five-, six- or seven-membered heterocyclic ring that includes at least one nitrogen atom and at least one carbon atom. The ring additionally includes three, four or five atoms independently selected from carbon, nitrogen, sulfur and oxygen atoms. The heterocyclic ring has at least one substituent located at a ring position adjacent to a ring nitrogen atom. This mandatory substituent of the ring includes a moiety (B), linked to the heterocyclic ring via a hydrocarbyl or an azo group. The invention also discloses pharmaceutically acceptable salt forms of heterocyclic compounds.
Invention compounds are useful for a wide variety of applications. For example heterocyclic compounds can act to modulate physiological processes by functioning as agonists and antagonists of receptors in the nervous system. Invention compounds may also act as insecticides and as fungicides.
Pharmaceutical compositions containing invention compounds also have wide utility.
In accordance with the present invention, there are also provided methods of modulating the activity of excitatory amino acid receptors using a specifically defined class of heterocyclic compounds.
In one embodiment, there are provided methods of modulating metabotropic glutamate receptors. The present invention also provides methods and compositions for treating or preventing disease using heterocyclic compounds. In one embodiment, compounds of the invention are used in the manufacture of a medicament for treating disease contemplated herein. Diseases contemplated include cerebral ischemia, chronic neurodegeneration, psychiatric disorders, schizophrenia, mood disorders, emotion disorders, disorders of extrapyramidal motor function, obesity, disorders of respiration, motor control and function, attention deficit disorders, concentration disorders, pain disorders, neurodegenerative disorders, epilepsy, convulsive disorders, eating disorders, sleep disorders, sexual disorders, circadian disorders, drug withdrawal, drug addiction, compulsive disorders, anxiety, panic disorders, depressive disorders, skin disorders, retinal ischemia, retinal degeneration, glaucoma, disorders associated with organ transplantation, asthma, ischemia and astrocytomas. The invention further discloses methods of preventing disease conditions related to diseases of the pulmonary system, diseases of the nervous system, diseases of the cardiovascular system, diseases of the gastrointestinal system, diseases of the endocrine system, diseases of the exocrine system, diseases of the skin, cancer and diseases of the ophthalmic system.
FIELD OF INVENTION
The present invention relates to novel heterocyclic compounds which contain a heterocylic ring bearing at least one substituent attached by a linker containing an acetylenic group, a vinylic group or an azo group. In addition, the present invention relates to therapeutic methods of use of heterocyclic compounds for the treatment and prevention of various disease conditions.
BACKGROUND OF THE INVENTION
Unsaturated heterocylic compounds fmd a wide variety of uses. -For example, compounds of this class fmd uses as modulators of physiological processes that are mediated by ligand-activated receptors. Receptors that are activated by ligands are located throughout the nervous, cardiac, renal, digestive and bronchial systems, among others. Therefore, in the nervous system, for example, heterocyclic compounds are capable of functioning as agonists or antagonists of receptors for neurotransmitters, neurohormones and neuromodulators. Ligand-activated receptors have been identified in a wide variety of species, -including humans, other mammals and vertebrates as well as in invertebrate species. Therefore, compounds of this class are also able to modulate receptor-mediated processes throughout phylogeny and find uses in a wide variety of applications, e.g., as pharmaceuticals, insecticides and fungicides.
Receptors activated by excitatory amino acids, such as the amino acid L-glutamic acid (glutamate), are a major excitatory neurotransmitter receptor class in the mammalian central nervous system.
Anatomical, biochemical and electrophysiological analyses suggest that glutamatergic systems are involved in a broad array of neuronal processes, including fast excitatory synaptic transmission, regulation of neurotransmitter release, long-term potentiation, long-term depression, learning and memory, developmental synaptic plasticity, hypoxic-ischemic damage and neuronal cell death, epileptiform seizures, visual processing, as well as the pathogenesis of several neurodegenerative disorders. See generally, Nakanishi et al., Brain Research Reviews 20:230-235 (1998); Monaghan et al, Am Rev. PharmacoZ
Toxicol. 29:365-402 (1980). This extensive repertoire of functions, especially those related to learning, neurotoxicity, and neuropathology, has stimulated recent attempts to describe and define the mechanisms through which glutamate exerts its effects.
Glutamate has been observed to mediate its effects through receptors that have been categorized into two main groups: ionotropic and metabotropic. Metabotropic glutamate receptors are divided into three groups based on amino acid sequence homology, transduction mechanism and pharmacological properties, namely Group I, Group II and Group III. Each Group of receptors contains one or more types of receptors. For example, Group I includes metabotropic glutamate receptors 1 and 5 (mG1uR1 and mGluR5), Group II includes metabotropic glutamate receptors 2 and 3 (mGluR2 and mGluR3) and Group III includes metabotropic glutamate receptors 4, 6, 7 and 8 (mGluR4, mGluR6, mGluR7 and mGluR8). Several subtypes of a mGluR type may exist. For example, subtypes of mGluRl include mGluRla, mGluRlb, mGluRlc and mGluRld.
Anatomical studies demonstrate a broad and selective distribution of metabotropic glutamate receptors in the mammalian nervous system. For example, mGluRl is expressed in the cerebellum, olfactory bulb, hippocampus, lateral septum, thalamus, globus pallidus, entopeduncular nucleus, ventral pallidum and substantia nigra (Petralia et al., (1997) J. Chem. Neuroanat., 13:77-93; Shigemoto et al., (1992) J. Comp. Neurol., 322:121-135). In contrast, mGluR5 is weakly expressed in the cerebellum, while higher levels of expression are found in the striatum and cortex (Romano et al., (1995) J. Comp.
Neurol., 355:455-469). In the hippocampus, mGluR5 appears widely distributed and is diffusely expressed.
Metabotropic glutamate receptors are typically characterized by seven putative transmembrane domains, preceded by a large putative extracellular amino-terminal domain and followed by a large putative intracelluar carboxy-terminal domain. The receptors couple to G-proteins and activate certain second messengers depending on the receptor group. Thus, for example, Group I
mGluRs activate phospholipase C. Activation of the receptors results in the hydrolysis of membrane phosphatidylinositol (4,5)-bisphosphate to diacylglycerol, which activates protein kinase C, and inositol trisphosphate, which in turn activates the inositol trisphosphate receptor to promote the release of intracellular calcium.
Ionotropic glutamate receptors are generally divided into two classes: the N-methyl-D-aspartate (NMDA) and non-NMDA receptors. Both classes of receptors are linked to integral cation channels and share some amino acid sequence homology. G1uR1-4 are termed AMPA (a-amino-3-hydroxy-5-methylisoxazole-4-propionic acid) receptors because AMPA preferentially activates receptors composed of these subunits, while GIuR5-7 and KA1-2 are termed kainate receptors as these are preferentially sensitive to kainic acid. Thus, an "AMPA receptor" is a non-NMDA receptor that can be activated by AMPA. AMPA receptors include the GluR1-4 family, which form homo-oligomeric and hetero-oligomeric complexes which display different current-voltage relations and calcium permeability. Polypeptides encoded by G1uR1-4 nucleic acid sequences can form functional ligand-gated ion channels. An AMPA receptor includes a receptor having a GluRl, G1uR2, GluR3 and/or G1uR4 subunit. A NMDA receptor includes a receptor having NMDARI, NMDAR2a, NMDAR2b, NMDAR2c, NMDAR2d and/or NMDAR3 subunits.
Because of the physiological and pathological significance of excitatory amino acid receptors generally and metabotropic glutamate receptors, in particular, there is a need to identify methods of modulating excitatory amino acid receptor-mediated processes, as well as therapeutic methods of treatment and methods for prevention of diseases. Also, there is a continuing need in the art for new members of a compound class that can modulate excitatory amino acid receptors.
The present invention satisfies these and related needs.
BRIEF DESCRIPTION OF THE INVENTION
In accordance with the present invention, there is provided a novel class of heterocyclic compounds. Compounds of the invention contain a substituted, unsaturated five-, six- or seven-membered heterocyclic ring that includes at least one nitrogen atom and at least one carbon atom. The ring additionally includes three, four or five atoms independently selected from carbon, nitrogen, sulfur and oxygen atoms. The heterocyclic ring has at least one substituent located at a ring position adjacent to a ring nitrogen atom. This mandatory substituent of the ring includes a moiety (B), linked to the heterocyclic ring via a hydrocarbyl or an azo group. The invention also discloses pharmaceutically acceptable salt forms of heterocyclic compounds.
Invention compounds are useful for a wide variety of applications. For example heterocyclic compounds can act to modulate physiological processes by functioning as agonists and antagonists of receptors in the nervous system. Invention compounds may also act as insecticides and as fungicides.
Pharmaceutical compositions containing invention compounds also have wide utility.
In accordance with the present invention, there are also provided methods of modulating the activity of excitatory amino acid receptors using a specifically defined class of heterocyclic compounds.
In one embodiment, there are provided methods of modulating metabotropic glutamate receptors. The present invention also provides methods and compositions for treating or preventing disease using heterocyclic compounds. In one embodiment, compounds of the invention are used in the manufacture of a medicament for treating disease contemplated herein. Diseases contemplated include cerebral ischemia, chronic neurodegeneration, psychiatric disorders, schizophrenia, mood disorders, emotion disorders, disorders of extrapyramidal motor function, obesity, disorders of respiration, motor control and function, attention deficit disorders, concentration disorders, pain disorders, neurodegenerative disorders, epilepsy, convulsive disorders, eating disorders, sleep disorders, sexual disorders, circadian disorders, drug withdrawal, drug addiction, compulsive disorders, anxiety, panic disorders, depressive disorders, skin disorders, retinal ischemia, retinal degeneration, glaucoma, disorders associated with organ transplantation, asthma, ischemia and astrocytomas. The invention further discloses methods of preventing disease conditions related to diseases of the pulmonary system, diseases of the nervous system, diseases of the cardiovascular system, diseases of the gastrointestinal system, diseases of the endocrine system, diseases of the exocrine system, diseases of the skin, cancer and diseases of the ophthalmic system.
DETAILED DESCRIPTION OF THE INVENTION
In accordance with the present invention, there are provided compounds having the structure:
A-L-.B
or enantiomers, diastereomeric isomers or mixtures of any two or more thereof, or pharmaceutically acceptable salts thereof, wherein:
A is a 5-, 6- or 7-membered ring having the structure:
Y W
(R)q_+
ZEN
wherein at least one of W, X, Y and Z is (CR)p, wherein p is 0, 1 or 2;
the remainder of W, X, Y and Z are each independently 0, N or S; and each R is independently halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocycle, mercapto, nitro, carboxyl, carbamate, carboxamide, hydroxy, ester, cyano, amine, amide, amidine, amido, sulfonyl or sulfonamide, wherein g is 0, 1, 2 or 3;
L is substituted or unsubstituted alkenylene, alkynylene, or azo; and B is substituted or unsubstituted hydrocarbyl, substituted or unsubstituted cyclohydrocarbyl, substituted or unsubstituted heterocycle, optionally containing one or more double bonds, or substituted or unsubstituted aryl;
provided, that the following compounds are excluded:
the compounds wherein A is a 6-membered ring wherein:
W, X, Y and Z are (CR)P wherein p is 1; and R at the W position is hydrogen, lower alkyl, hydroxy, hydroxy-lower alkyl, amino-lower alkyl, lower alkylamino-lower alkyl, di-lower alkylamino-lower alkyl, unsubstituted or hydroxy-substituted lower alkyleneamino-lower alkyl, lower alkoxy, lower alkanoyloxy, amino-lower alkoxy, lower alkylamino-lower alkoxy, di-lower alkylamino-lower alkoxy, phthalimido-lower alkoxy, unsubstituted or hydroxy- or 2-oxo-imidazolidin-1-yl-substitued lower alkyleneamino-lower alkoxy, carboxy, esterified or amidated carboxy, carboxy-lower alkoxy or esterified carboxy-lower-alkoxy; R at the X position is hydrogen; R at the Y position is hydrogen, lower alkyl, carboxy, esterified carboxy, amidated carboxy, hydroxy-lower alkyl, hydroxy, lower alkoxy or lower alkanoyloxy; and R at the Z
position is hydrogen, lower alkyl, hydroxy-lower alkyl, carboxy, esterified carboxy, amidated carboxy, unsubstituted or lower alkyl-, lower alkoxy-, halo- and/or trifluoromethyl-substituted N-lower alkyl-N-phenylcarbamoyl, lower alkoxy, halo-lower alkyl or halo-lower alkoxy;
L is substituted or unsubstituted alkenylene, alkynylene or azo, B is substituted or unsubstituted aryl or heterocycle having two or more double bonds, wherein substituents are independently lower alkyl, lower alkenyl, lower alkynyl, phenyl, phenyl-lower alkynyl, hydroxy, hydroxy-lower alkyl, lower alkoxy, lower alkenyloxy, lower alkylenedioxy, lower 5 alkanoyloxy, phenoxy, phenyl-lower alkoxy, acyl, carboxy, esterified carboxy, amidated carboxy, cyano, nitro, amino, acylamino, N-acyl-N-lower alkylamino, halo and halo-lower alkyl, wherein phenyl, phenyl-lower alkynyl, phenoxy, and phenyl-lower alkoxy may bear further substituents; and the compounds wherein A is a 6-membered ring wherein:
W, X, Y and Z are (CR)p wherein p is 1; R at the X position is not hydrogen;
and R at the W, Y and Z positions are hydrogen;
L is alkenylene or alkynylene; and B is a substituted or unsubstituted aryl or heterocycle containing two or more double bonds; and the compounds wherein A is a 5-membered ring wherein:
one of W, X, Y and Z is (CR)P, and p is 0, two of W, X, Y and Z are (CR)P and p is 1, and the remaining variable ring member is 0 or S; or one of W, X, Y and Z is N, one of W, X, Y and Z is (CR)p and p is 1, one of W, X, Y and Z is (CR)P and p is 0, and the remaining variable ring member is 0, S or (CR)P, and p is 1; or two of W, X, Y and Z are N, one of W, X, Y and Z is (CR)P, and p is 0, and the remaining variable ring member is, 0 or S or (CR)P, and p is 1;
each R is independently hydrogen, nitro, halogen, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylthio, C1-C4-haloalkylthio, C3-C6-alkenyl or C3-C8-cycloalkyl;
L is alkynylene; and B is substituted or unsubstituted aryl, wherein substituents are independently nitro, cyano, C1-C6-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkthio, C1-C4-haloalkylthio, C1-C4-alkoxycarbonyl, C3-C6-alkenyl, phenyl or phenoxy, wherein phenyl and phenoxy may bear further substituents; and the compounds wherein A is a 6-membered ring wherein:
W, X, Y and Z are (CR)p, wherein p is 1 and R is hydrogen, L is alkynylene; and B is unsubstituted 1-cyclopenten-l-yl or unsubstituted 1-cyclohexen-l-yl; and the compounds wherein A is a 5-membered ring wherein:
In accordance with the present invention, there are provided compounds having the structure:
A-L-.B
or enantiomers, diastereomeric isomers or mixtures of any two or more thereof, or pharmaceutically acceptable salts thereof, wherein:
A is a 5-, 6- or 7-membered ring having the structure:
Y W
(R)q_+
ZEN
wherein at least one of W, X, Y and Z is (CR)p, wherein p is 0, 1 or 2;
the remainder of W, X, Y and Z are each independently 0, N or S; and each R is independently halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocycle, mercapto, nitro, carboxyl, carbamate, carboxamide, hydroxy, ester, cyano, amine, amide, amidine, amido, sulfonyl or sulfonamide, wherein g is 0, 1, 2 or 3;
L is substituted or unsubstituted alkenylene, alkynylene, or azo; and B is substituted or unsubstituted hydrocarbyl, substituted or unsubstituted cyclohydrocarbyl, substituted or unsubstituted heterocycle, optionally containing one or more double bonds, or substituted or unsubstituted aryl;
provided, that the following compounds are excluded:
the compounds wherein A is a 6-membered ring wherein:
W, X, Y and Z are (CR)P wherein p is 1; and R at the W position is hydrogen, lower alkyl, hydroxy, hydroxy-lower alkyl, amino-lower alkyl, lower alkylamino-lower alkyl, di-lower alkylamino-lower alkyl, unsubstituted or hydroxy-substituted lower alkyleneamino-lower alkyl, lower alkoxy, lower alkanoyloxy, amino-lower alkoxy, lower alkylamino-lower alkoxy, di-lower alkylamino-lower alkoxy, phthalimido-lower alkoxy, unsubstituted or hydroxy- or 2-oxo-imidazolidin-1-yl-substitued lower alkyleneamino-lower alkoxy, carboxy, esterified or amidated carboxy, carboxy-lower alkoxy or esterified carboxy-lower-alkoxy; R at the X position is hydrogen; R at the Y position is hydrogen, lower alkyl, carboxy, esterified carboxy, amidated carboxy, hydroxy-lower alkyl, hydroxy, lower alkoxy or lower alkanoyloxy; and R at the Z
position is hydrogen, lower alkyl, hydroxy-lower alkyl, carboxy, esterified carboxy, amidated carboxy, unsubstituted or lower alkyl-, lower alkoxy-, halo- and/or trifluoromethyl-substituted N-lower alkyl-N-phenylcarbamoyl, lower alkoxy, halo-lower alkyl or halo-lower alkoxy;
L is substituted or unsubstituted alkenylene, alkynylene or azo, B is substituted or unsubstituted aryl or heterocycle having two or more double bonds, wherein substituents are independently lower alkyl, lower alkenyl, lower alkynyl, phenyl, phenyl-lower alkynyl, hydroxy, hydroxy-lower alkyl, lower alkoxy, lower alkenyloxy, lower alkylenedioxy, lower 5 alkanoyloxy, phenoxy, phenyl-lower alkoxy, acyl, carboxy, esterified carboxy, amidated carboxy, cyano, nitro, amino, acylamino, N-acyl-N-lower alkylamino, halo and halo-lower alkyl, wherein phenyl, phenyl-lower alkynyl, phenoxy, and phenyl-lower alkoxy may bear further substituents; and the compounds wherein A is a 6-membered ring wherein:
W, X, Y and Z are (CR)p wherein p is 1; R at the X position is not hydrogen;
and R at the W, Y and Z positions are hydrogen;
L is alkenylene or alkynylene; and B is a substituted or unsubstituted aryl or heterocycle containing two or more double bonds; and the compounds wherein A is a 5-membered ring wherein:
one of W, X, Y and Z is (CR)P, and p is 0, two of W, X, Y and Z are (CR)P and p is 1, and the remaining variable ring member is 0 or S; or one of W, X, Y and Z is N, one of W, X, Y and Z is (CR)p and p is 1, one of W, X, Y and Z is (CR)P and p is 0, and the remaining variable ring member is 0, S or (CR)P, and p is 1; or two of W, X, Y and Z are N, one of W, X, Y and Z is (CR)P, and p is 0, and the remaining variable ring member is, 0 or S or (CR)P, and p is 1;
each R is independently hydrogen, nitro, halogen, C1-C4-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkylthio, C1-C4-haloalkylthio, C3-C6-alkenyl or C3-C8-cycloalkyl;
L is alkynylene; and B is substituted or unsubstituted aryl, wherein substituents are independently nitro, cyano, C1-C6-alkyl, C1-C4-haloalkyl, C1-C4-alkoxy, C1-C4-haloalkoxy, C1-C4-alkthio, C1-C4-haloalkylthio, C1-C4-alkoxycarbonyl, C3-C6-alkenyl, phenyl or phenoxy, wherein phenyl and phenoxy may bear further substituents; and the compounds wherein A is a 6-membered ring wherein:
W, X, Y and Z are (CR)p, wherein p is 1 and R is hydrogen, L is alkynylene; and B is unsubstituted 1-cyclopenten-l-yl or unsubstituted 1-cyclohexen-l-yl; and the compounds wherein A is a 5-membered ring wherein:
W is (CR)p, and p is 0, Y and Z are (CR)p, and p is 1, X is N or S; and R is phenyl; or W is (CR)p, and p is 0, X and Z are (CR)p, and p is 1,Y is 0,N or S;andRis phenyl;
L is unsubstituted alkenylene and B is unsubstituted phenyl; and the compounds wherein A is a 5-membered ring containing two double bonds, wherein one of W, X, Y and Z is (CR)p, and p is 0, and the remaining ring members are (CR)p and p is 1 ; and the compounds wherein A is unsubstituted heterocycle containing two or more double bonds; L
is alkenylene or alkynylene, and B is unsubstituted phenyl.
In one embodiment, there is provided a compound having the structure:
A-L-B
wherein:
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with: halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
As employed herein, "hydrocarbyl" refers to straight or branched chain univalent and bivalent radicals derived from saturated or unsaturated moieties containing only carbon and hydrogen atoms, and having in the range of about 1 up to 12 carbon atoms. Exemplary hydrocarbyl moieties include alkyl moieties, alkenyl moieties, dialkenyl moieties, trialkenyl moieties, alkynyl moieties, alkadiynal moieties, alkatriynal moieties, alkenyne moieties, alkadienyne moieties, alkenediyne moieties, and the like. The term "substituted hydrocarbyl" refers to hydrocarbyl moieties further bearing substituents as set forth below.
6a As employed herein, "alkyl" refers to straight or branched chain alkyl radicals having in the range of about 1 up to 12 carbon atoms; "substituted alkyl" refers to alkyl radicals further bearing one or more substituents such as hydroxy, alkoxy, mercapto, aryl, heterocycle, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amide, amidine, amido, carboxyl, carboxamide, carbamate, ester, sulfonyl, sulfonamide, and the like.
As employed herein, "alkenyl" refers to straight or branched chain hydrocarbyl radicals having at least one carbon-carbon double bond, and having in the range of about 2 up to 12 carbon atoms (with radicals having in the range of about 2 up to 6 carbon atoms presently preferred), and "substituted alkenyl" refers to alkenyl radicals further bearing one or more substituents as set forth above.
As employed herein, "alkenylene" refers to straight or branched chain divalent alkenyl moieties having at least one carbon-carbon double bond, and having in the range of about 2 up to 12 carbon atoms (with divalent alkenyl moieties having in the range of about 2 up to 6 carbon atoms presently preferred), and "substituted lower alkenylene" refers to divalent alkenyl radicals further bearing one or more substituents as set forth above.
L is unsubstituted alkenylene and B is unsubstituted phenyl; and the compounds wherein A is a 5-membered ring containing two double bonds, wherein one of W, X, Y and Z is (CR)p, and p is 0, and the remaining ring members are (CR)p and p is 1 ; and the compounds wherein A is unsubstituted heterocycle containing two or more double bonds; L
is alkenylene or alkynylene, and B is unsubstituted phenyl.
In one embodiment, there is provided a compound having the structure:
A-L-B
wherein:
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with: halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
As employed herein, "hydrocarbyl" refers to straight or branched chain univalent and bivalent radicals derived from saturated or unsaturated moieties containing only carbon and hydrogen atoms, and having in the range of about 1 up to 12 carbon atoms. Exemplary hydrocarbyl moieties include alkyl moieties, alkenyl moieties, dialkenyl moieties, trialkenyl moieties, alkynyl moieties, alkadiynal moieties, alkatriynal moieties, alkenyne moieties, alkadienyne moieties, alkenediyne moieties, and the like. The term "substituted hydrocarbyl" refers to hydrocarbyl moieties further bearing substituents as set forth below.
6a As employed herein, "alkyl" refers to straight or branched chain alkyl radicals having in the range of about 1 up to 12 carbon atoms; "substituted alkyl" refers to alkyl radicals further bearing one or more substituents such as hydroxy, alkoxy, mercapto, aryl, heterocycle, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amide, amidine, amido, carboxyl, carboxamide, carbamate, ester, sulfonyl, sulfonamide, and the like.
As employed herein, "alkenyl" refers to straight or branched chain hydrocarbyl radicals having at least one carbon-carbon double bond, and having in the range of about 2 up to 12 carbon atoms (with radicals having in the range of about 2 up to 6 carbon atoms presently preferred), and "substituted alkenyl" refers to alkenyl radicals further bearing one or more substituents as set forth above.
As employed herein, "alkenylene" refers to straight or branched chain divalent alkenyl moieties having at least one carbon-carbon double bond, and having in the range of about 2 up to 12 carbon atoms (with divalent alkenyl moieties having in the range of about 2 up to 6 carbon atoms presently preferred), and "substituted lower alkenylene" refers to divalent alkenyl radicals further bearing one or more substituents as set forth above.
As employed herein, "alkynyl" refers to straight or branched chain hydrocarbyl radicals having at least one carbon-carbon triple bond, and having in the range of about 2 up to 12 carbon atoms (with radicals having in the range of about 2 up to 6 carbon atoms presently being preferred), and "substituted alkynyl" refers to alkynyl radicals further bearing one or more substituents as set forth above.
As employed herein, "alkynylene" refers to straight or branched chain divalent alkynyl moieties having at least one carbon-carbon triple bond, and having in the range of about 2 up to 12 carbon atoms (with divalent alkynyl moieties having two carbon atoms presently being preferred), and "substituted alkynylene" refers to divalent alkynyl radicals further bearing one or more substituents as set forth above.
As employed herein, "cyclohydrocarbyl" refers to cyclic (i.e., ring-containing) univalent radicals derived from saturated or unsaturated moieties containing only carbon and hydrogen atoms, and having in the range of about 3 up to 20 carbon atoms. Exemplary cyclohydrocarbyl moieties include cycloalkyl moieties, cycloalkenyl moieties, cycloalkadienyl moieties, cycloalkatrienyl moieties, cycloalkynyl moieties, cycloalkadiynyl moieties, spiro hydrocarbon moieties wherein two rings are joined by a single atom which is the only common member of the two rings (e.g., spiro[3.4]octanyl, and the like), bicyclic hydrocarbon moieties wherein two rings are joined and have two atoms in common (e.g., bicyclo [3.2.1]octane, bicyclo [2.2.1]hept-2-ene, norbornene, decalin, and the like), and the like.
The term "substituted cyclohydrocarbyl" refers to cyclohydrocarbyl moieties further bearing one or more substituents as set forth above.
As employed herein, "cycloalkyl" refers to ring-containing alkyl radicals containing in the range of about 3 up to 20 carbon atoms, and "substituted cycloalkyl" refers to cycloalkyl radicals further bearing one or more substituents as set forth above.
As employed herein, "cycloalkenyl" refers to ring-containing alkenyl radicals having at least one carbon-carbon double bond in the ring, and having in the range of about 3 up to 20 carbon atoms, and "substituted cycloalkenyl" refers to cyclic alkenyl radicals further bearing one or more substituents as set forth above.
As employed herein, "cycloalkynyl" refers to ring-containing alkynyl radicals having at least one carbon-carbon triple bond in the ring, and having in the range of about 3 up to 20 carbon atoms, and "substituted cycloalkynyl" refers to cyclic alkynyl radicals further bearing one or more substituents as set forth above.
As employed herein, "aryl" refers to mononuclear and polynuclear aromatic radicals having in the range of 6 up to 14 carbon atoms, and "substituted aryl" refers to aryl radicals further bearing one or more substituents as set forth above, for example, alkylaryl moieties.
As employed herein, "alkynylene" refers to straight or branched chain divalent alkynyl moieties having at least one carbon-carbon triple bond, and having in the range of about 2 up to 12 carbon atoms (with divalent alkynyl moieties having two carbon atoms presently being preferred), and "substituted alkynylene" refers to divalent alkynyl radicals further bearing one or more substituents as set forth above.
As employed herein, "cyclohydrocarbyl" refers to cyclic (i.e., ring-containing) univalent radicals derived from saturated or unsaturated moieties containing only carbon and hydrogen atoms, and having in the range of about 3 up to 20 carbon atoms. Exemplary cyclohydrocarbyl moieties include cycloalkyl moieties, cycloalkenyl moieties, cycloalkadienyl moieties, cycloalkatrienyl moieties, cycloalkynyl moieties, cycloalkadiynyl moieties, spiro hydrocarbon moieties wherein two rings are joined by a single atom which is the only common member of the two rings (e.g., spiro[3.4]octanyl, and the like), bicyclic hydrocarbon moieties wherein two rings are joined and have two atoms in common (e.g., bicyclo [3.2.1]octane, bicyclo [2.2.1]hept-2-ene, norbornene, decalin, and the like), and the like.
The term "substituted cyclohydrocarbyl" refers to cyclohydrocarbyl moieties further bearing one or more substituents as set forth above.
As employed herein, "cycloalkyl" refers to ring-containing alkyl radicals containing in the range of about 3 up to 20 carbon atoms, and "substituted cycloalkyl" refers to cycloalkyl radicals further bearing one or more substituents as set forth above.
As employed herein, "cycloalkenyl" refers to ring-containing alkenyl radicals having at least one carbon-carbon double bond in the ring, and having in the range of about 3 up to 20 carbon atoms, and "substituted cycloalkenyl" refers to cyclic alkenyl radicals further bearing one or more substituents as set forth above.
As employed herein, "cycloalkynyl" refers to ring-containing alkynyl radicals having at least one carbon-carbon triple bond in the ring, and having in the range of about 3 up to 20 carbon atoms, and "substituted cycloalkynyl" refers to cyclic alkynyl radicals further bearing one or more substituents as set forth above.
As employed herein, "aryl" refers to mononuclear and polynuclear aromatic radicals having in the range of 6 up to 14 carbon atoms, and "substituted aryl" refers to aryl radicals further bearing one or more substituents as set forth above, for example, alkylaryl moieties.
As employed herein, "heterocycle" refers to ring-containing radicals having one or more heteroatoms (e.g., N, 0, S) as part of the ring structure, and having in the range of 3 up to 20 atoms in the ring. Heterocyclic moieties may be saturated or unsaturated when optionally containing one or more double bonds, and may contain more than one ring. Heterocyclic moieties include, for example, monocyclic moieties such as imidazolyl moieties, pyrimidinyl moieties, isothiazolyl moieties, isoxazolyl moieties, moieties, and the like, and bicyclic heterocyclic moieties such as azabicycloalkanyl moieties, oxabicycloalkyl moieties, and the like. The term "substituted heterocycle"
refers to heterocycles further bearing one or more substituents as set forth above.
As employed herein, "azo" refers to the bivalent moiety -N=N-, wherein each single bond is attached to a different carbon atom.
As employed herein, "halogen" refers to fluoride, chloride, bromide or iodide radicals.
In accordance with the present invention, A is a 5-, 6- or 7-membered unsaturated heterocyclic moiety, containing a ring having at least one nitrogen atom located on the ring in a position adjacent to a carbon atom which bears a linking moiety as a substituent. The ring further contains 3, 4 or 5 independently variable atoms selected from carbon, nitrogen, sulfur and oxygen. Thus, A can be pyridinyl, imidazolyl, pyridazinyl, pyrimidinyl, pyrazoyl, pyrazinyl, triazolyl, triazinyl, tetrazolyl, tetrazinyl, isoxazolyl, oxazolyl, oxadiazolyl, oxatriazolyl, oxadiazinyl, isothiazolyl, thiazoyl, dioxazolyl, oxathiazolyl, oxathiazinyl, azepinyl, diazepinyl, and the like. Those of skill in the art will recognize that multiple isomers exist for a single chemical formula; each of the possible isomeric forms of the various empirical formulae set forth herein are contemplated by the invention. When a variable ring atom is carbon, it bears a hydrogen, or is optionally substituted with halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, thiol, nitro, carboxyl, ester, cyano, amine, amide, carboxamide, amidine, amido, sulfonamide, and the like, with presently preferred embodiments having no substituent (i.e., q is 0) or bearing the following substituents: halogen, alkyl, containing one up to four carbon atoms, fluorinated alkyl, containing one up to four carbon atoms, aryl, and amine. Substitution at position Z of the ring is presently preferred.
In accordance with one embodiment of the invention, A is a 5-, 6- or 7-membered ring containing, as ring members, a nitrogen atom and a sulfur atom. Moieties contemplated for use by this embodiment of the invention include those wherein A is isothiazol-3-yl (1,2-thiazol-3-yl), thiazol-4-yl (1,3; thiazol-4-yl), thiazol-2-yl (1,3-thiazol-2-yl), 1,2-thiazin-3-yl, 1,3-thiazin-4-yl, 1,4-thiazin-3-yl, 1,3-thiazin-2-yl, thiazepinyl, and the like. Presently preferred moieties include those wherein A is isothiazol-3-yl (1,2-thiazol-3-yl), thiazol-4-yl (1,3-thiazol-4-yl) and thiazol-2-yl (1,3-thiazol-2-yl).
In accordance with another embodiment of the invention, A is a 5-, 6- or 7-membered ring containing, as ring members, a nitrogen atom and an oxygen atom. Moieties contemplated by this embodiment of the invention include those wherein A is 1,2-oxazin-3-yl, 1,3-oxazin-4-yl, 1,4-oxazin-3-yl, 1,3-oxazin-2-yl, oxazol-2-yl, isoxazol-3-yl, oxazol-4-yl, oxazepinyl, and the like. Presently preferred moieties include those wherein A is oxazol-2-yl, isoxazol-3-yl and oxazol-4-yl.
In accordance with another embodiment of the invention, A is a 5-, 6- or 7-membered ring containing, as a ring member, a nitrogen atom. Moieties contemplated by this embodiment of the invention include those wherein A is 2-pyridinyl and 2-pyrrolyl.
In accordance with another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing, as ring members, two nitrogen atoms. Moieties contemplated by this embodiment of the invention include those wherein A is 3-pyridazinyl (1,2-diazin-3-yl), pyrimidin-4-yl (1,3-diazin-4-yl), pyrazin-3-yl (1,4-diazin-3-yl), pyrimidin-2-yl (1,3-diazin-2-yl), pyrazol-3-yl (1,2-diazol-3-yl), imidazol-4-yl (1,3-isodiazol-4-yl, imidazol-2-yl (1,3-isodiazol-2-yl), diazepinyl, and the like. Presently preferred moieties include those wherein A is 3-pyridazinyl (1,2-diazin-3-yl), pyrimidin-4-yl (1,3-diazin-4-yl), pyrazin-3-yl (1,4-diazin-3-yl), pyrimidin-2-yl (1,3-diazin-2-yl), 1,3-isodiazol-4-yl and 1,3-isodiazol-2-yl.
In accordance with still another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing, as ring members, three nitrogen atoms. Moieties contemplated by this embodiment of the invention include those wherein A is 1,2,3-triazin-4-yl, 1,2,4-triazin-6-yl, 1,2,4-triazin-3-yl, 1,2,4-triazin-5-yl, 1,3,5-triazin-2-yl, 1,2,3-triazol-4-yl, 1,2,4-triazol-3-yl, triazepinyl, and the like. Presently preferred moieties include those wherein A is 1,2,3-triazin-4-yl, 1,2,4-triazin-6-yl, 1,2,4-triazin-3-yl, 1,2,4-triazin-5-yl, 1,3,5-triazin-2-yl, 1,2,3-triazol-4-yl, 1,2,4-triazol-3-yl.
In accordance with still another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing, as ring members, four nitrogen atoms. Moieties contemplated for use in the practice of the invention include those wherein A is tetrazin-2-yl, tetrazin-3-yl, tetrazin-5-yl, tetrazolyl, tetrazepinyl, and the like. Presently preferred moieties include those wherein A is tetrazolyl.
In accordance with yet another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing, as ring members, one sulfur atom and two nitrogen atoms. Moieties contemplated by this embodiment of the invention include those wherein A is 1,2,6-thiadiazin-3-yl, 1,2,5-thiadiazin-3-yl, 1,2,4-thiadiazin-3-yl, 1,2,5-thiadiazin-4-yl, 1,2,3-thiadiazin-4-yl, 1,3,4-thiadiazin-5-yl, 1,3,4-thiadiazin-2-yl, 1,2,4-thiadiazin-5-yl, 1,3,5-thiadiazin-4-yl, 1,3,5-thiadiazin-2-yl, 1,2,4-thiadiazol-3-yl, 1,2,3-thiadiazol-4-yl, 1,3,4-thiadiazol-2-yl, 1,2,5-thiadiazol-3-yl, 1,2,4-thiadiazol-5-yl, thiadiazepinyl, and the like. Presently preferred moieties include those wherein A
is 1,2,4-thiadiazol-3-yl, 1,2,3-thiadiazol-4-yl, 1,3,4-thiadiazol-2-yl, 1,2,5-thiadiazol-3-yl and 1,2,4-thiadiazol-5-yl.
In accordance with yet another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing, as ring members, one oxygen atom and two nitrogen atoms. Moieties contemplated by this embodiment of the invention include those wherein A is 1,2,6-oxadiazin-3-yl, 1,2,5-oxadiazin-3-yl, 1,2,4-oxadiazin-3-yl, 1,2,5-oxadiazin-4-yl, 1,2,3-oxadiazin-4-yl, 1,3,4-oxadiazin-5-yl, 5 1,3,4-oxadiazin-2-yl, 1,2,4-oxadiazin-5-yl, 1,3,5-oxadiazin-4-yl, 1,3,5-oxadiazin-2-yl, 1,2,4-oxadiazol-3-yl, 1,2,3-oxadiazol-4-yl, 1,3,4-oxadiazol-2-yl, 1,2,5-oxadiazol-3-yl, 1,2,4-oxadiazol-5-yl, oxadiazepinyl, and the like. Presently preferred moieties include those wherein A
is 1,2,4-oxadiazol-3-yl, 1,2,3-oxadiazol-4-yl, 1,3,4-oxadiazol-2-yl, 1,2,5-oxadiazol-3-yl and 1,2,4-oxadiazol-5-yl.
refers to heterocycles further bearing one or more substituents as set forth above.
As employed herein, "azo" refers to the bivalent moiety -N=N-, wherein each single bond is attached to a different carbon atom.
As employed herein, "halogen" refers to fluoride, chloride, bromide or iodide radicals.
In accordance with the present invention, A is a 5-, 6- or 7-membered unsaturated heterocyclic moiety, containing a ring having at least one nitrogen atom located on the ring in a position adjacent to a carbon atom which bears a linking moiety as a substituent. The ring further contains 3, 4 or 5 independently variable atoms selected from carbon, nitrogen, sulfur and oxygen. Thus, A can be pyridinyl, imidazolyl, pyridazinyl, pyrimidinyl, pyrazoyl, pyrazinyl, triazolyl, triazinyl, tetrazolyl, tetrazinyl, isoxazolyl, oxazolyl, oxadiazolyl, oxatriazolyl, oxadiazinyl, isothiazolyl, thiazoyl, dioxazolyl, oxathiazolyl, oxathiazinyl, azepinyl, diazepinyl, and the like. Those of skill in the art will recognize that multiple isomers exist for a single chemical formula; each of the possible isomeric forms of the various empirical formulae set forth herein are contemplated by the invention. When a variable ring atom is carbon, it bears a hydrogen, or is optionally substituted with halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, thiol, nitro, carboxyl, ester, cyano, amine, amide, carboxamide, amidine, amido, sulfonamide, and the like, with presently preferred embodiments having no substituent (i.e., q is 0) or bearing the following substituents: halogen, alkyl, containing one up to four carbon atoms, fluorinated alkyl, containing one up to four carbon atoms, aryl, and amine. Substitution at position Z of the ring is presently preferred.
In accordance with one embodiment of the invention, A is a 5-, 6- or 7-membered ring containing, as ring members, a nitrogen atom and a sulfur atom. Moieties contemplated for use by this embodiment of the invention include those wherein A is isothiazol-3-yl (1,2-thiazol-3-yl), thiazol-4-yl (1,3; thiazol-4-yl), thiazol-2-yl (1,3-thiazol-2-yl), 1,2-thiazin-3-yl, 1,3-thiazin-4-yl, 1,4-thiazin-3-yl, 1,3-thiazin-2-yl, thiazepinyl, and the like. Presently preferred moieties include those wherein A is isothiazol-3-yl (1,2-thiazol-3-yl), thiazol-4-yl (1,3-thiazol-4-yl) and thiazol-2-yl (1,3-thiazol-2-yl).
In accordance with another embodiment of the invention, A is a 5-, 6- or 7-membered ring containing, as ring members, a nitrogen atom and an oxygen atom. Moieties contemplated by this embodiment of the invention include those wherein A is 1,2-oxazin-3-yl, 1,3-oxazin-4-yl, 1,4-oxazin-3-yl, 1,3-oxazin-2-yl, oxazol-2-yl, isoxazol-3-yl, oxazol-4-yl, oxazepinyl, and the like. Presently preferred moieties include those wherein A is oxazol-2-yl, isoxazol-3-yl and oxazol-4-yl.
In accordance with another embodiment of the invention, A is a 5-, 6- or 7-membered ring containing, as a ring member, a nitrogen atom. Moieties contemplated by this embodiment of the invention include those wherein A is 2-pyridinyl and 2-pyrrolyl.
In accordance with another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing, as ring members, two nitrogen atoms. Moieties contemplated by this embodiment of the invention include those wherein A is 3-pyridazinyl (1,2-diazin-3-yl), pyrimidin-4-yl (1,3-diazin-4-yl), pyrazin-3-yl (1,4-diazin-3-yl), pyrimidin-2-yl (1,3-diazin-2-yl), pyrazol-3-yl (1,2-diazol-3-yl), imidazol-4-yl (1,3-isodiazol-4-yl, imidazol-2-yl (1,3-isodiazol-2-yl), diazepinyl, and the like. Presently preferred moieties include those wherein A is 3-pyridazinyl (1,2-diazin-3-yl), pyrimidin-4-yl (1,3-diazin-4-yl), pyrazin-3-yl (1,4-diazin-3-yl), pyrimidin-2-yl (1,3-diazin-2-yl), 1,3-isodiazol-4-yl and 1,3-isodiazol-2-yl.
In accordance with still another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing, as ring members, three nitrogen atoms. Moieties contemplated by this embodiment of the invention include those wherein A is 1,2,3-triazin-4-yl, 1,2,4-triazin-6-yl, 1,2,4-triazin-3-yl, 1,2,4-triazin-5-yl, 1,3,5-triazin-2-yl, 1,2,3-triazol-4-yl, 1,2,4-triazol-3-yl, triazepinyl, and the like. Presently preferred moieties include those wherein A is 1,2,3-triazin-4-yl, 1,2,4-triazin-6-yl, 1,2,4-triazin-3-yl, 1,2,4-triazin-5-yl, 1,3,5-triazin-2-yl, 1,2,3-triazol-4-yl, 1,2,4-triazol-3-yl.
In accordance with still another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing, as ring members, four nitrogen atoms. Moieties contemplated for use in the practice of the invention include those wherein A is tetrazin-2-yl, tetrazin-3-yl, tetrazin-5-yl, tetrazolyl, tetrazepinyl, and the like. Presently preferred moieties include those wherein A is tetrazolyl.
In accordance with yet another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing, as ring members, one sulfur atom and two nitrogen atoms. Moieties contemplated by this embodiment of the invention include those wherein A is 1,2,6-thiadiazin-3-yl, 1,2,5-thiadiazin-3-yl, 1,2,4-thiadiazin-3-yl, 1,2,5-thiadiazin-4-yl, 1,2,3-thiadiazin-4-yl, 1,3,4-thiadiazin-5-yl, 1,3,4-thiadiazin-2-yl, 1,2,4-thiadiazin-5-yl, 1,3,5-thiadiazin-4-yl, 1,3,5-thiadiazin-2-yl, 1,2,4-thiadiazol-3-yl, 1,2,3-thiadiazol-4-yl, 1,3,4-thiadiazol-2-yl, 1,2,5-thiadiazol-3-yl, 1,2,4-thiadiazol-5-yl, thiadiazepinyl, and the like. Presently preferred moieties include those wherein A
is 1,2,4-thiadiazol-3-yl, 1,2,3-thiadiazol-4-yl, 1,3,4-thiadiazol-2-yl, 1,2,5-thiadiazol-3-yl and 1,2,4-thiadiazol-5-yl.
In accordance with yet another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing, as ring members, one oxygen atom and two nitrogen atoms. Moieties contemplated by this embodiment of the invention include those wherein A is 1,2,6-oxadiazin-3-yl, 1,2,5-oxadiazin-3-yl, 1,2,4-oxadiazin-3-yl, 1,2,5-oxadiazin-4-yl, 1,2,3-oxadiazin-4-yl, 1,3,4-oxadiazin-5-yl, 5 1,3,4-oxadiazin-2-yl, 1,2,4-oxadiazin-5-yl, 1,3,5-oxadiazin-4-yl, 1,3,5-oxadiazin-2-yl, 1,2,4-oxadiazol-3-yl, 1,2,3-oxadiazol-4-yl, 1,3,4-oxadiazol-2-yl, 1,2,5-oxadiazol-3-yl, 1,2,4-oxadiazol-5-yl, oxadiazepinyl, and the like. Presently preferred moieties include those wherein A
is 1,2,4-oxadiazol-3-yl, 1,2,3-oxadiazol-4-yl, 1,3,4-oxadiazol-2-yl, 1,2,5-oxadiazol-3-yl and 1,2,4-oxadiazol-5-yl.
10 In accordance with still another embodiment of the invention, A is a 5-, 6-, or 7-membered ring containing as ring members, one up to six nitrogen atoms, and/or one up to six carbon atoms, and/or zero up to five sulfur atoms, and/or zero up to five oxygen atoms.
Further, in accordance with the present invention, L is a linking moiety which links moieties A and B. L is selected from substituted or unsubstituted alkenylene moieties, alkynylene moieties or azo moieties. Presently preferred compounds of the invention are those wherein L
is alkenylene or alkynylene moieties containing two carbon atoms, with alkynylene most preferred.
Further, in accordance with the present invention, B is a moiety linked through bridging moiety L
to moiety A. Radicals contemplated for use in the invention are those wherein B is substituted or unsubstituted hydrocarbyl, substituted or unsubstituted cyclohydrocarbyl, substituted or unsubstituted heterocycle, optionally containing one or more double bonds, substituted or unsubstituted aryl, and the like.
Presently preferred compounds of the invention are those wherein B is a substituted or unsubstituted hydrocarbyl selected from substituted or unsubstituted alkyl moieties, alkenyl moieties, dialkenyl moieties, trialkenyl moieties, alkynyl moieties, alkadiynyl moieties, alkatriynyl moieties, alkenynyl moieties, alkadienynyl moieties, alkenediynyl moieties, and the like.
Further preferred compounds of the invention are those wherein B is a substituted or unsubstituted cyclohydrocarbyl selected from substituted or unsubstituted cycloalkyl moieties, cycloalkenyl moieties, cycloalkadienyl moieties, cycloalkatrienyl moieties, cycloalkynyl moieties, cycloalkadiynyl moieties, bicyclic hydrocarbon moieties wherein two rings have two atoms in common, and the like. Especially preferred compounds are those wherein B is cycloalkyl and cycloalkenyl having in the range of 4 up to about 8 carbon atoms. Exemplary compounds include cyclopropanyl, cyclopentenyl and cyclohexenyl. Also especially preferred are bicyclic hydrocarbon moieties wherein two rings have two atoms in common; exemplary compounds include indenyl, dihydroindenyl, naphthalenyl and dihydronaphthalenyl.
Further, in accordance with the present invention, L is a linking moiety which links moieties A and B. L is selected from substituted or unsubstituted alkenylene moieties, alkynylene moieties or azo moieties. Presently preferred compounds of the invention are those wherein L
is alkenylene or alkynylene moieties containing two carbon atoms, with alkynylene most preferred.
Further, in accordance with the present invention, B is a moiety linked through bridging moiety L
to moiety A. Radicals contemplated for use in the invention are those wherein B is substituted or unsubstituted hydrocarbyl, substituted or unsubstituted cyclohydrocarbyl, substituted or unsubstituted heterocycle, optionally containing one or more double bonds, substituted or unsubstituted aryl, and the like.
Presently preferred compounds of the invention are those wherein B is a substituted or unsubstituted hydrocarbyl selected from substituted or unsubstituted alkyl moieties, alkenyl moieties, dialkenyl moieties, trialkenyl moieties, alkynyl moieties, alkadiynyl moieties, alkatriynyl moieties, alkenynyl moieties, alkadienynyl moieties, alkenediynyl moieties, and the like.
Further preferred compounds of the invention are those wherein B is a substituted or unsubstituted cyclohydrocarbyl selected from substituted or unsubstituted cycloalkyl moieties, cycloalkenyl moieties, cycloalkadienyl moieties, cycloalkatrienyl moieties, cycloalkynyl moieties, cycloalkadiynyl moieties, bicyclic hydrocarbon moieties wherein two rings have two atoms in common, and the like. Especially preferred compounds are those wherein B is cycloalkyl and cycloalkenyl having in the range of 4 up to about 8 carbon atoms. Exemplary compounds include cyclopropanyl, cyclopentenyl and cyclohexenyl. Also especially preferred are bicyclic hydrocarbon moieties wherein two rings have two atoms in common; exemplary compounds include indenyl, dihydroindenyl, naphthalenyl and dihydronaphthalenyl.
Still further preferred compounds of the invention are those wherein B is a substituted or unsubstituted heterocycle, optionally containing one or more double bonds.
Exemplary compounds include pyridyl, thiazolyl, furyl, dihydropyranyl, dihydrothiopyranyl, piperidinyl, isoxazolyl, pyridazinyl, pyrimidinyl, pyrazinyl, and the like. Also preferred are compounds wherein B is substituted or unsubstituted aryl. Especially preferred compounds are those wherein substituents are aryl and heterocycle, optionally bearing further substituents as described herein, methyl, trifluoromethyl, cyclopropyl, alkoxy, halogen and cyano. Also preferred are compounds wherein B
is a bicylic heterocyle moiety wherein two rings have two atoms in common. Exemplary compounds include indolyl and isoquinolinyl.
Those of skill in the art recognize that invention compounds may contain one or more chiral centers, and thus can exist as racemic mixtures. For many applications, it is preferred to carry out stereoselective syntheses and/or to subject the reaction product to appropriate purification steps so as to produce substantially optically pure materials. Suitable stereoselective synthetic procedures for producing optically pure materials are well known in the art, as are procedures for purifying racemic mixtures into optically pure fractions. Those of skill in the art will further recognize that invention compounds may exist in polymorphic forms wherein a compound is capable of crystallizing in different forms. Suitable methods for identifying and separating polymorphisms are known in the art.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, esterified carboxy is, for example, lower alkoxycarbonyl, phenyl-lower alkoxycarbonyl or phenyl-lower alkoxycarbonyl substituted in the phenyl moiety by one or more substituents selected from lower alkyl, lower alkoxy, halo and halo-lower alkyl. Esterified carboxy-lower-alkoxy is, for example, lower alkoxycarbonyl-lower alkoxy. Amidated carboxy is, for example, unsubstituted or aliphatically substituted carbamoyl such as carbamoyl, N-lower alkylcarbamoyl, NN-di-lower alkylcarbamoyl unsubstituted or lower alkyl-, lower alkoxy-, halo- and/or trifluoromethyl-substituted N-phenyl- or N-lower-alkyl-N-phenyl-carbamoyl.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, acyl is, for example, lower alkanoyl, lower alkenoyl or unsubstituted or lower alkyl-, lower alkoxy-, halo- and/or trifluoromethyl-substituted benzoyl. Acylamino is, for example, lower alkanoylamino, and N-acyl-N-lower alkylamino is, for example, N-lower alkanoyl-N-lower-alkylamino or unsubstituted or lower alkyl-, lower alkoxy-, halo- and/or trifluoromethyl-substituted benzoylamino.
As referred to in reference to compounds excluded herein when referring to novel compounds of the invention, "lower" groups are understood to comprise up to and including seven carbon atoms. N-lower-alkyl-N-phenylcarbamoyl is, for example, N-Ci-C4alkyl-N-phenylcarbamoyl, such as N-methyl, N-ethyl, N-propyl, N-isopropyl or N-butyl-N-phenylcarbamoyl.
Exemplary compounds include pyridyl, thiazolyl, furyl, dihydropyranyl, dihydrothiopyranyl, piperidinyl, isoxazolyl, pyridazinyl, pyrimidinyl, pyrazinyl, and the like. Also preferred are compounds wherein B is substituted or unsubstituted aryl. Especially preferred compounds are those wherein substituents are aryl and heterocycle, optionally bearing further substituents as described herein, methyl, trifluoromethyl, cyclopropyl, alkoxy, halogen and cyano. Also preferred are compounds wherein B
is a bicylic heterocyle moiety wherein two rings have two atoms in common. Exemplary compounds include indolyl and isoquinolinyl.
Those of skill in the art recognize that invention compounds may contain one or more chiral centers, and thus can exist as racemic mixtures. For many applications, it is preferred to carry out stereoselective syntheses and/or to subject the reaction product to appropriate purification steps so as to produce substantially optically pure materials. Suitable stereoselective synthetic procedures for producing optically pure materials are well known in the art, as are procedures for purifying racemic mixtures into optically pure fractions. Those of skill in the art will further recognize that invention compounds may exist in polymorphic forms wherein a compound is capable of crystallizing in different forms. Suitable methods for identifying and separating polymorphisms are known in the art.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, esterified carboxy is, for example, lower alkoxycarbonyl, phenyl-lower alkoxycarbonyl or phenyl-lower alkoxycarbonyl substituted in the phenyl moiety by one or more substituents selected from lower alkyl, lower alkoxy, halo and halo-lower alkyl. Esterified carboxy-lower-alkoxy is, for example, lower alkoxycarbonyl-lower alkoxy. Amidated carboxy is, for example, unsubstituted or aliphatically substituted carbamoyl such as carbamoyl, N-lower alkylcarbamoyl, NN-di-lower alkylcarbamoyl unsubstituted or lower alkyl-, lower alkoxy-, halo- and/or trifluoromethyl-substituted N-phenyl- or N-lower-alkyl-N-phenyl-carbamoyl.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, acyl is, for example, lower alkanoyl, lower alkenoyl or unsubstituted or lower alkyl-, lower alkoxy-, halo- and/or trifluoromethyl-substituted benzoyl. Acylamino is, for example, lower alkanoylamino, and N-acyl-N-lower alkylamino is, for example, N-lower alkanoyl-N-lower-alkylamino or unsubstituted or lower alkyl-, lower alkoxy-, halo- and/or trifluoromethyl-substituted benzoylamino.
As referred to in reference to compounds excluded herein when referring to novel compounds of the invention, "lower" groups are understood to comprise up to and including seven carbon atoms. N-lower-alkyl-N-phenylcarbamoyl is, for example, N-Ci-C4alkyl-N-phenylcarbamoyl, such as N-methyl, N-ethyl, N-propyl, N-isopropyl or N-butyl-N-phenylcarbamoyl.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, amino-lower alkyl is, for example, amino-C,-C4alkyl, preferably of the formula -(CH2),,,-NH2 in which n is 2 or 3, such as aminomethyl, 2-aminoethyl, 3-aminopropyl or 4-aminobutyl.
Hydroxy-lower alkyl is, for example, hydroxy-C,-C4alkyl, such as hydroxymethyl, 2-hydroxy ethyl, 3-hydroxypropyl, 2-hydroxyisopropyl or 4-hydroxybutyl. Halo-lower alkyl is, for example, polyhalo-C,-C4alkyl, such as trifluoromethyl.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, lower alkoxy is, for example, C,-C7alkoxy, preferably C,-C4alkoxy, such as methoxy, ethoxy, propyloxy, isopropyloxy or butyloxy, but may also represent isobutyloxy, sec.butyloxy, tert.-butyloxy or a C5-C,alkoxy group, such as a pentyloxy, hexyloxy or heptyloxy group.amino-lower alkoxy is, for example, amino-C2-C4alkoxy preferably of the formula -O-(CH2)n NRaRb in which n is 2 or 3, such as 2-aminoethoxy, 3-aminopropyloxy or 4-aminobutyloxy. Carboxy-lower-alkoxy is, for example, carboxy-C,-C4alkoxy, such as carboxymethoxy, 2-carboxyethoxy, 3-carboxypropyloxy or 4-carboxybutyloxy. Lower alkanoyloxy is, for example, C,-C7alkanoyloxy, such as acetoxy, propionyloxy, butyryloxy, isobutyryloxy or pivaloyloxy. Halo-lower alkoxy is, for example, halo- or polyhalo-C,-C7alkoxy, preferably halo- or polyhalo-C,-C4alkoxy, such as halo-or polyhaloethoxy, halo-or polyhalopropyloxy or butyl-oxy, wherein "poly" refers, for example, to tri-or pentahalo, and "halo"
denotes, for example, fluoro or chloro.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, lower alkylamino-lower alkoxy is, for example, C,-C4alkylamino-C2-C4alkoxy, preferably of the formula -O-(CH2)n-NRaRb in which n is 2 or 3 and Ra and Rb, independently of each other, denote lower alkyl groups as defined hereinbefore, such as methyl, ethyl, propyl or butyl. Lower alkylamino-lower alkyl is, for example, C,-C4alkylamino-C,-C4alkyl, preferably of the formula -(CH2)n NRaRb in which n is 2 or 3 and Ra and Rb, independently of each other, denote lower alkyl groups as defined hereinbefore, such as methyl, ethyl, propyl or butyl. Di-lower alkylamino-lower alkyl is, for example, Di-C,-C4alkylamino-C,-C4alkyl, preferably of the formula -(CH2)n NRaRb in which n is 2 or 3 and Ra and Rb, independently of each other, denote lower alkyl groups such as methyl, ethyl, propyl or butyl. Di-lower alkylamino-lower alkoxy is, for example, Di-C,-C4alkylamino-C2-C4alkoxy, preferably of the formula -O-(CH2)n-NRaRb in which n is 2 or 3 and Ra and Rb, independently of each other, denote lower alkyl groups such as methyl, ethyl, propyl or butyl.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, optionally hydroxy-substituted lower alkyleneamino-lower alkyl is, for example, unsubstituted or hydroxy-substituted 5- to 7-membered alkyleneamino-C,-C4alkyl, preferably of the formula -(CH2) -R, in which n is 2 or 3 and R, pyrrolidino, hydroxypyrrolidino, piperidino, hydroxypiperidino, homopiperidino or hydroxyhomopiperidino. Furthermore, optionally hydroxy-substituted lower alkyleneamino-lower alkoxy is, for example, unsubstituted or hydroxy-substituted 5-to 7-membered alkyleneamino-Ci-C4alkoxy, preferably of the formula -O-(CH2) -&
in which n is 2 or 3 and R, pyrrolidino, hydroxypyrrolidino, piperidino, hydroxypiperidino, homopiperidino or hydroxyhomopiperidino.
In accordance with another embodiment of the present invention, there are provided pharmaceutical compositions comprising heterocyclic compounds as described above, in combination with pharmaceutically acceptable carriers. Optionally, invention compounds can be converted into non-toxic acid addition salts, depending on the substituents thereon. Thus, the above-described compounds (optionally in combination with pharmaceutically acceptable carriers) can be used in the manufacture of medicaments useful for the treatment of a variety of indications.
Pharmaceutically acceptable carriers contemplated for use in the practice of the present invention include carriers suitable for oral, sublingual intravenous, subcutaneous, transcutaneous, intramuscular, intracutaneous, intrathecal, epidural, intraoccular, intracranial, inhalation, rectal, vaginal, and the like administration. Administration in the form of creams, lotions, tablets, capsules, pellets, dispersible 'powders, granules, suppositoiries, syrups, elixirs, lozenges, injectable solutions, sterile aqueous or non-aqueous solutions, suspensions or emulsions, patches, and the like, is contemplated. Pharmaceutically acceptable carriers include glucose, lactose, gum acacia, gelatin, mannitol, starch paste, magnesium trisilicate, talc, corn starch, keratin, colloidal silica, potato starch, urea, dextrans, and the like.
Invention compounds can optionally be converted into non-toxic acid addition salts. Such salts are generally prepared by reacting the compounds of this invention with a suitable organic or inorganic acid..
Representative salts include hydrochloride, hydrobromide, sulfate, bisulfate, methanesulfonate, acetate, oxalate, adipate, alginate, aspartate, valerate, oleate, laurate, borate, benzoate, lactate, phosphate, toluenesulfonate (tosylate), citrate, malate, maleate, fumarate, succinate, tartrate, napsylate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, benzenesulfonate, butyrate, camphorate, camphorsulfonate, cyclopentanepropionate, digluconate, dodecylsulfate, glucoheptanoate, glycerophosphate, heptanoate, hexanoate, undecanoate, 2-hydroxyethanesulfonate,ethanesulfonate, and the like. Salts can also be formed with inorganic acids such as sulfate, bisulfate, hemisulfate, hydrochloride, chlorate, perchlorate, hydrobromide, hydroiodide, and the like.
Examples of a base salt include ammonium salts; alkali metal salts such as sodium salts, potassium salts, and the like; alkaline earth metal salts such as calcium salts, magnesium salts, and the like; salts with organic bases such as dicyclohexylamine salts, N-methyl-D-glucamine, phenylethylamine, and the like;
and salts with amino acids such as arginine, lysine, and the like. Such salts can readily be prepared employing methods well known in the art.
In accordance with another embodiment of the present invention, there are provided methods for the preparation of heterocyclic compounds as described above. For example, many of the heterocyclic compounds described above can be prepared using synthetic chemistry techniques well known in the art (see Comprehensive Heterocyclic Chemistry, Katritzky, A. R.
and Rees, C. W. eds., Pergamon Press, Oxford, 1984) from a precursor of the substituted heterocycle of Formula 1 as outlined in Scheme 1.
Scheme 1 X.
Y,X,W Coupling_ (R)qW
(R)q Z -:N D + E = B z.N
B
Thus in Scheme 1, a substituted heterocycle precursor (prepared using synthetic chemistry techniques well known in the art) is reacted with an alkyne derivative. In Scheme 1, (R)q, W, X, Y, Z
and B are as defined above and D and E are functional groups which are capable of undergoing a transition metal-catalyzed cross-coupling reaction. For example, D is a group such as hydrogen, halogen, acyloxy, fluorosulfonate, trifluoromethanesulfonate, alkyl- or arylsulfonate, alkyl- or arylsulfinate, alkyl- or arylsulfide, phosphate, phosphinate, and the like, and E is hydrogen or a metallic or metalloid species such as Li, MgX (X is halogen), SnR3, B(OR)2, SiR3, GeR3, and the like. The coupling may be promoted by a homogeneous catalyst such as PdC12(PPh3)2i or by a heterogeneous catalyst such as Pd on carbon in a suitable solvent (e.g., tetrahydrofuran (THF), dimethoxyethane (DME), acetonitrile, dimethylformamide (DMF), etc.). Typically, a co-catalyst such as copper (I) iodide and a base (e.g., triethylamine, K2CO3 etc.) will also be present in the reaction mixture. The coupling reaction typically proceeds by allowing the reaction temperature to warm slowly from about 0 C up to ambient temperature over a period of several hours. The reaction mixture is then maintained at ambient temperature, or heated to a temperature anywhere between 30 C and 150 C. The reaction mixture is then maintained at a suitable temperature for a time in the range of about 4 up to 48 hours, with about 12 hours typically being sufficient. The product from the reaction can be isolated and purified employing standard techniques, such as solvent extraction, chromatography, crystallization, distillation, and the like.
Another embodiment of the present invention is illustrated in Scheme 2. A
substituted heterocycle precursor is reacted with an alkene derivative in a manner similar to the procedure described for Scheme 1.
Scheme 2 Y 'X, W
W + EB Coupling (R)q -To (R)4 z.Np z. N" B
The alkene derivative product from Scheme 2 may be converted to an alkyne derivative using the approach outlined in Scheme 3.
Scheme 3 X. X. X.
(R)qW Halogenation (R)4W G Base (R)qW
.N
z.`NJ~j,tiB z.NB z G B
5 Thus, the alkene derivative may be contacted with a halogenating agent such as chlorine, bromine, iodine, NCS (N-chlorosuccinimide), NBS (N-bromosuccinimide), NIS (N-iodosuccinimide), iodine monochloride, etc. in a suitable solvent (CC14, CHC13, CH2C12, acetic acid, and the like). The resulting halogenated derivative (G = halogen) is then treated with a suitable base such as NaOH, KOH, DBU (1,8-diazabicyclo[5.4.0]undec-7-ene), DBN (diazabicyclononene), DABCO
10 (1,4-diazabicyclo[2.2.2] octane), and the like, which promotes a double elimination reaction to afford the alkyne. The reaction is carried out in a suitable solvent such as ethanol, acetonitrile, toluene, etc. at an appropriate temperature, usually between about 0 C and 150 C.
In another embodiment of the present invention, a substituted heterocyclic derivative is reacted with an aldehyde or ketone to provide a substituted alkene. (See Scheme 4.) Scheme 4 Y 'X, W =+ O B Catalyst (R)gYW OR (R)q W
(R)q z.N~
K z.N B z.N-L6 Thus, in Scheme 4, J is hydrogen, PR3, P(O)(OR)2, SO2R, SiR3, and the like, K
is hydrogen, alkyl or aryl (as defined previously) and R is hydrogen, acetyl, and the like.
Suitable catalysts for this reaction include bases such as NaH, n-buytllithium, lithium diisopropylamide, lithium hexamethyl disilazide, H2NR, HNR2, NR3 etc., or electropositive reagents such as Ac20, ZnCl2, and the like. The reaction is carried out in a suitable solvent (THF, acetonitrile, etc.) at an appropriate temperature, usually between about 0 C and 150 C. Sometimes an intermediate is isolated and purified or partially purified before continuing through to the alkene product.
In yet another embodiment of the present invention, a substituted heterocyclic aldehyde or ketone is reacted with an activated methylene-containing compound to provide a substituted alkene.
(See Scheme 5.) Scheme 5 Y"X. W X.
(R)q O + B Catalyst (R)4 Y W 0- (R)q W y 'X' N i Ng z.N~B
K OR
Thus, in Scheme 5, J, K, R, the-catalyst and reaction conditions are as described for Scheme 4.
Again, as in Scheme 4, sometimes an intermediate is isolated and purified or partially purified before continuing through to the alkene product.
The alkene products from the reactions in Scheme 4 and Scheme 5 may be converted to an alkyne derivative using reagents and conditions as described for Scheme 3.
Another method for the preparation of heterocyclic compounds of Formula I is depicted in Scheme 6.
Scheme 6 Y )q Heat (R)q + G Y'~ Y=O,S
H
O L-g (R)q N L-B
In scheme 6, Y is 0 or S and G is halogen or a similar leaving group, and L
and B are as defined previously. The reagents are contacted in a suitable solvent such as ethanol, DMF, and the like and stirred until the product forms. Typically reaction temperatures will be in the range of ambient through to about 150 C, and reaction times will be from about 1 h to about 48 h, with about 70 C and 4 h being presently preferred. The heterocycle product can be isolated and purified employing standard techniques, such as solvent extraction, chromatography, crystallization, distillation, and the like. Often, the product will be isolated as the hydrochloride or hydrobromide salt, and this material may be carried onto the next step with or without purification.
Yet another method for the preparation of heterocyclic compounds of Formula I
is depicted in Scheme 7.
Scheme 7 (R)q G W\ Heat (R)q + H, ~\ W W=O,S
(R)q-~-,O L-B (R)q---'N""-L-B
In Scheme 7, W may be 0 or S, G is halogen or a similar leaving group, and L
and B are as defined previously. The reaction conditions and purification procedures are as described for Scheme 6.
In another embodiment of the present invention, depicted in Scheme 8, an alkynyl-substituted heterocycle precursor (prepared using synthetic chemistry techniques well known in the art) is reacted with a species B, bearing a reactive functional group D (See Scheme 8.) Scheme 8 (R)q(Y ~W
(R)q__1 10'N' .X.W + p` Coupling u B z.N
E B
In Scheme 8, (R)q, W, X, Y, Z and B are as defined above and D and E are functional groups which are capable of undergoing a transition metal-catalyzed cross-coupling reaction. For example, D
is a group such as hydrogen, halogen, acyloxy, fluorosulfonate, trifluoromethanesulfonate, alkyl- or arylsulfonate, alkyl- or arylsulfinate, alkyl- or arylsulfide, phosphate, phosphinate, and the like, and E is hydrogen or a metallic or metalloid species such as Li, MgX (X is halogen), SnR3, B(OR)2, SiR3, GeR3, and the like. The coupling may be promoted by a homogeneous catalyst such as PdC12(PPh3)2, or by a heterogeneous catalyst such as Pd on carbon in a suitable solvent (e.g.
tetrahydrofuran (THF), dimethoxyethane (DME), acetonitrile, dimethylformamide (DMF), etc.). Typically a co-catalyst such as copper (I) iodide and the like and a base (e.g. triethylamine, K2CO3, etc.) will also be present in the reaction mixture. The coupling reaction is typically allowed to proceed by allowing the reaction temperature to warm slowly from about 0 C up to ambient temperature over a period of several hours.
The reaction mixture is then maintained at ambient temperature, or heated to a temperature anywhere between about 30 C up to about 150 C. The reaction mixture is then maintained at a suitable temperature for a time in the range of about 4 up to about 48 hours, with about 12 hours typically being sufficient. The product from the reaction can be isolated and purified employing standard techniques, such as solvent extraction, chromatography, crystallization, distillation, and the like.
Another embodiment of the present invention is illustrated in Scheme 9.
Scheme 9 (R)q Y 'X' 3"~_E + D Coupling (R)q ~W
T-0 IN.
z.N~B z.N" "~B
An alkenyl-substituted heterocycle precursor is reacted with an alkene derivative in a manner similar to the procedure described for Scheme 8. The product alkene derivative from Scheme 9 may be converted to an alkyne derivative using the approach outlined previously in Scheme 3 above.
In yet another embodiment of the present invention, depicted in Scheme 10, an alkynyl-substituted heterocycle precursor is reacted with a species composed of a carbonyl group bearing substituents R' and CHR"R"'.
Scheme 10 X. ,X.
Y 'X, (R)qW + O Catalyst (Rkl ZOW (R)4 YW R~~' 30 Z' z N N OR N
E R R' R"
R"' Thus in Scheme 10, R', R" and R"' may be hydrogen or other substituents as described previously, or may optionally combine to form a ring (this portion of the molecule constitutes B in the final compound). E is hydrogen or a metallic or metalloid species such as Li, MgX, wherein X is halogen, SnR3, B(OR)2, SiR3, GeR3, and the like. Suitable catalysts for this reaction include bases such as NaH, n-butyllithium, lithium diisopropylamide, lithium hexamethylsilazide, H2NR, HNR2, NR3, nBu4NF, ethylmagnesium halide, etc. R in Scheme 10 may be hydrogen, Ac, and the like. Typically the reaction is carried out in a suitable solvent such as diethylether, THF, DME, toluene, and the like, and at an appropriate temperature, usually between -100 C and 25 C. The reaction is allowed to proceed for an appropriate length of time, usually from about 15 minutes to about 24 hours. The intermediate bearing the -OR group may be isolated and purified as described above, partially purified or carried on to the next step without purification. Elimination of the -OR
group to provide the alkene derivative may be accomplished using a variety of methods well known to those skilled in the art. For example, the intermediate may be contacted with POC13 in a solvent such as pyridine and stirred at a suitable temperature, typically between about 0 C and about 150 C, for an appropriate amount of time, usually between about 1 h and about 48 h. The product from the reaction can be isolated and purified employing standard techniques, such as solvent extraction, chromatography, crystallization, distillation, and the like.
In accordance with another embodiment of the present invention, there are provided methods of modulating the activity of excitatory amino acid receptors, said method comprising contacting said receptors with at least one compound as described above, as well as additional compounds of the same basic structure but having substitution patterns which may have been previously disclosed but never contmplated for use for such purposes. Thus, compounds contemplated for use in accordance with invention modulations methods include those having the structure A -L- B or enantiomers, diastereomeric isomers or mixtures of any two or more thereof, or pharmaceutically acceptable salts thereof, in an amount sufficient to modulate the activity of said excitatory amino acid receptor, wherein:
A is a 5-, 6- or 7-membered ring having the structure:
W
X V
(R)q-}- 0 Z
wherein at least one of V, W, X, Y and Z is (CR)P, wherein p is 0, 1 or 2;
at least one of V, W, X,VandZis0,NorS;
the remainder of V, W, X, Y and Z are each independently 0, N or S; and each R is independently halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocycle, mercapto, nitro, carboxyl, carbamate, carboxamide, hydroxy, ester, cyano, amine, amide, amidine, amido, sulfonyl or sulfonamide, wherein q is 0, 1, 2 or 3;
L is substituted or unsubstituted alkenylene, alkynylene, or azo; and B is substituted or unsubstituted hydrocarbyl, substituted or unsubstituted cyclohydrocarbyl, substituted or unsubstituted heterocycle, optionally containing one or more double bonds, or substituted or unsubstituted aryl;
provided, that the following compounds are excluded:
the compounds wherein A is a 6-membered ring wherein:
V, W, X and Y are (CR)p, wherein p is 1, Z is N;
R at the V position is hydrogen, lower alkyl, hydroxy, hydroxy-lower alkyl, amino-lower alkyl, lower alkylamino-lower alkyl, di-lower alkylamino-lower alkyl, unsubstituted or hydroxy-substituted lower alkyleneamino-lower alkyl, lower alkoxy, lower alkanoyloxy, amino-lower alkoxy, lower alkylamino-lower alkoxy, di-lower alkylamino-lower alkoxy, phthalimido-lower alkoxy, unsubstituted or hydroxy- or 2-oxo-imidazolidin-1-yl-substitued lower alkyleneamino-lower alkoxy, carboxy, esterified or amidated carboxy, carboxy-lower alkoxy or esterified carboxy-lower-alkoxy; R at the W position is hydrogen; R at the X position is hydrogen, lower alkyl, carboxy, esterified carboxy, amidated carboxy, hydroxy-lower alkyl, hydroxy, lower alkoxy or lower alkanoyloxy; and R at the Y
position is hydrogen, lower alkyl, hydroxy-lower alkyl, carboxy, esterified carboxy, amidated carboxy, unsubstituted or lower alkyl-, lower alkoxy-, halo- and/or trifluoromethyl-substituted N-lower alkyl-N-5 phenylcarbamoyl, lower alkoxy, halo-lower alkyl or halo-lower alkoxy;
L is substituted or unsubstituted alkenylene, alkynylene or azo, and B is substituted or unsubstituted aryl or heterocycle having two or more double bonds, wherein substituents are independently lower alkyl, lower alkenyl, lower alkynyl, phenyl, phenyl-lower alkynyl, hydroxy, hydroxy-lower alkyl, lower alkoxy, lower alkenyloxy, lower alkylenedioxy, lower 10 alkanoyloxy, phenoxy, phenyl-lower alkoxy, acyl, carboxy, esterified carboxy, amidated carboxy, cyano, nitro, amino, acylamino, N-acyl-N-lower alkylamino, halo and halo-lower alkyl, wherein phenyl, phenyl-lower alkynyl, phenoxy, and phenyl-lower alkoxy may bear further substituents.
As employed herein, "excitatory amino acid receptors" refers to a class of cell-surface receptors which are the major class of excitatory neurotransmitter receptors in the central nervous system. In 15 addition, receptors of this class also mediate inhibitory responses.
Excitatory amino acid receptors are membrane spanning proteins that mediate the stimulatory actions of the amino acid glutamate and possibly other endogenous acidic amino acids. Excitatory amino acids are crucial for fast and slow neurotransmission and they have been implicated in a variety of diseases including Alzheimer's disease, stroke, schizophrenia, head trauma, epilepsy, and the like. In addition, excitatory amino acids 20 are integral to the processes of long-term potentiation and depression which are synaptic mechanisms underlying learning and memory. There are three main subtypes of excitatory amino acid receptors: (1) the metabotropic receptors; (2) the ionotropic NMDA receptors; and (3) the non-NMDA receptors, which include the AMPA receptors and kainate receptors.
As employed herein, the phrase "modulating the activity of' refers to altered levels of activity so that the activity is different with the use of the invention method when compared to the activity without the use of the invention method. Modulating the activity of excitatory amino acid receptors includes the suppression or augmentation of the activity of receptors.
Suppression of receptor activity may be accomplished by a variety of means, including blocking of a ligand binding site, biochemical and/or physico-chemical modification of a ligand binding site, binding of agonist recognition domains, preventing ligand-activated conformational changes in the receptor, preventing the activated receptor from stimulating second messengers such as G-proteins, and the like.
Augmentation of receptor activity may be accomplished by a variety of means including, stabilization of a ligand binding site, biochemical and/or physico-chemical modification of a ligand binding site, binding of agonist recognition domains, promoting ligand-activated conformational changes in the receptor, and the like.
Excitatory amino acid receptor activity can be involved in numerous disease states. Therefore modulating the activity of receptors also refers to a variety of therapeutic applications, such as the treatment of cerebral ischemia, chronic neurodegeneration, psychiatric disorders, schizophrenia, mood disorders, emotion disorders, disorders of extrapyramidal motor function, obesity, disorders of respiration, motor control and function, attention deficit disorders, concentration disorders, pain disorders, neurodegenerative disorders, epilepsy, convulsive disorders, eating disorders, sleep disorders, sexual disorders, circadian disorders, drug withdrawal, drug addiction, compulsive disorders, anxiety, panic disorders, depressive disorders, skin disorders, retinal ischemia, retinal degeneration, glaucoma, disorders associated with organ transplantation, asthma, ischemia or astroytomas, and the like.
The compounds contemplated for use in accordance with of invention modulatory methods are especially useful for the treatment of mood disorders such as anxiety, depression, psychosis, drug withdrawal, tobacco withdrawal, memory loss, cognitive impairment, dementia, Alzheimer's disease, and the like; disorders of extrapyramidal motor function such as Parkinson's disease, progressive supramuscular palsy, Huntington's disease, Gilles de la Tourette syndrome, tardive dyskinesia, and the like.
Compounds contemplated for use in accordance with invention modulatory methods are also especially useful for the treatment of pain disorders such as neuropathic pain, chronic pain, acute pain, painful diabetic neuropathy, post-herpetic neuralgia, cancer-associated pain, pain associated with chemotherapy, pain associated with spinal cord injury, pain associated with multiple sclerosis, causalgia and reflex sympathetic dystrophy, phantom pain, post-stroke (central) pain, pain associated with HIV or AIDS, trigeminal neuralgia, lower back pain, myofacial disorders, migraine, osteoarthritic pain, postoperative pain, dental pain, post-burn pain, pain associated with systemic lupus, entrapment neuropathies, painful polyneuropathies, ocular pain, pain associated with inflammation, pain due to tissue injury, and the like.
"Contacting" may include contacting in solution or in solid phase.
"Pharmaceutically acceptable salt" refers to a salt of the compound used for treatment which possesses the desired pharmacological activity and which is physiologically suitable. The salt can be formed with organic acids such as acetate, adipate, alginate, aspartate, benzoate, benzenesulfonate, butyrate, citrate, camphorate, camphorsulfonate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, fumarate, glucoheptanoate, glycerophosphate, heptanoate, hexanoate, 2-hydroxyethanesulfonate, lactate, malate, maleate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, oxalate, tartrate, toluenesulfonate, undecanoate, and the like.
The salt can also be formed with inorganic acids such as sulfate, bisulfate, chlorate, perchlorate, hemisulfate, hydrochloride, hydrobromide, hydroiodide, and the like. In addition, the salt can be formed with a base salt, including ammonium salts, alkali metal salts such as sodium salts, potassium salts, and the like; alkaline earth metal salts such as calcium salts, magnesium salts, and the like; salts with organic bases such as dicyclohexylamine salts, N-methyl-D-glucamine, phenylethylamine, and the like;
and salts with amino acids such as arginine, lysine, and the like.
Salt forms of compounds herein find several advantages. Certain pharmaceutically acceptable salt forms of heterocyclic compounds described herein, achieve higher solubility as compared with non-salt forms. In addition, certain salt forms are more compatible with pharmaceutical uses. For example, the hydrochloric acid salt of 2-(phenylethynl)-1,3-thiazole is an oil while the toluene sulfonic acid salt form of 2-(phenylethynl)-1,3-thiazole is a solid that is soluble in aqueous medium. (See Example 187.) Characteristics of salt forms of compounds depend on the characteristics of the compound so treated, and on the particular salt employed.
In accordance with another embodiment of the invention, there are provided methods of modulating the activity of metabotropic glutamate receptors, said method comprising contacting metabotropic glutamate receptors with a concentration of a heterocylic compound as described above in accordance with invention methods for modulating the acitivity of excitatory amino acid receptors, sufficient to modulate the activity of said metabotropic glutamate receptors.
As used herein, the phrase "metabotropic glutamate receptor" refers to a class of cell-surface receptors which participates in the G-protein-coupled response of cells to glutamatergic ligands. Three groups of metabotropic glutamate receptors, identified on the basis of amino acid sequence homology, transduction mechanism and binding selectivity are presently known and each group contains one or more types of receptors. For example, Group I includes metabotropic glutamate receptors 1 and 5 (mGluR1 and mGluR5), Group II includes metabotropic glutamate receptors 2 and 3 (mGluR2 and mGluR3) and Group III includes metabotropic glutamate receptors 4, 6, 7 and 8 (mGluR4, mGluR6, mGluR7 and mGluR8). Several subtypes of each mGluR type may be found; for example, subtypes of mGluRl include mGluRla, mGluRlb and mGluRlc.
In accordance with another embodiment of the invention, there are provided methods of treating a wide variety of disease conditions, said method comprising administering to a patient having a disease condition a therapeutically effective amount of at least one of the heterocyclic compounds described above in accordance with invention methods for modulating the activity of excitatory amino acid receptors.
As used herein, "treating" refers to inhibiting or arresting the development of a disease, disorder or condition and/or causing the reduction, remission, or regression of a disease, disorder or condition. Those of skill in the art will understand that various methodologies and assays may be used to assess the development of a disease, disorder or condition, and similarly, various methodologies and assays may be used to assess the reduction, remission or regression of a disease, disorder or condition.
Disease conditions contemplated for treatment in accordance with the invention include cerebral ischemia, chronic neurodegeneration, psychiatric disorders, schizophrenia, mood disorders, emotion disorders, disorders of extrapyramidal motor function, obesity, disorders of respiration, motor control and function, attention deficit disorders, concentration disorders, pain disorders, neurodegenerative disorders, epilepsy, convulsive disorders, eating disorders, sleep disorders, sexual disorders, circadian disorders, drug withdrawal, drug addiction, compulsive disorders, anxiety, panic disorders, depressive disorders, skin disorders, retinal ischemia, retinal degeneration, glaucoma, disorders associated with organ transplantation, asthma, ischemia, astrocytomas, and the like.
Disease conditions contemplated for treatment in accordance with the present invention further include diseases of the pulmonary system, diseases of the nervous system, diseases of the cardiovascular system, diseases of the gastrointestinal system, diseases of the endocrine system, diseases of the exocrine system, diseases of the skin, cancer, diseases of the ophthalmic system, and the like.
As used herein, "administering" refers to means for providing heterocyclic compounds and/or salts thereof, as described herein, to a patient using oral, sublingual intravenous, subcutaneous, transcutaneous, intramuscular, intracutaneous, intrathecal, epidural, intraoccular, intracranial, inhalation, rectal, vaginal, and the like administration. Administration in the form of creams, lotions, tablets, capsules, pellets, dispersible powders, granules, suppositoiries, syrups, elixirs, lozenges, injectable solutions, sterile aqueous or non-aqueous solutions, suspensions or emulsions, patches, and the like, is also contemplated. The active ingredients may be compounded with non-toxic, pharmaceutically acceptable carriers including, glucose, lactose, gum acacia, gelatin, mannitol, starch paste, magnesium trisilicate, talc, corn starch, keratin, colloidal silica, potato starch, urea, dextrans, and the like.
For purposes of oral administration, tablets, capsules, troches, aqueous or oily suspensions, dispersible powders or granules, emulsions, hard or soft capsules, or syrups, elixirs and lozenges containing various excipients such as calcium carbonae, lactose, calcium phosphate, sodium phosphate, and the like may be employed along with various granulating and disintegrating agents such as corn starch, potato starch, alginic acid, and the like, together with binding agents such as gum tragacanth, corn starch, gelatin, acacia, and the like. Lubricating agents such as magnesium stearate, stearic acid, talc, and the like may also be added. Preparations intended for oral use may be prepared according to any methods known to the art for the manufacture of pharmaceutical preparations and such preparations may contain one or more agents selected from the group consisting of a sweetening agent such as sucrose, lactose, saccharin, and the lake, flavoring agents such as peppermint, oil of wintergreen, and the like, coloring agents and preserving agents in order to provide pharmaceutically palatable preparations.
Preparations for oral use may also contain suitable carriers include emulsions, solutions, suspensions, syrups, and the like, optionally containing additives such as wetting agents, emulsifying and suspending agents, sweetening, flavoring and perfuming agents, and the like. Tablets may be uncoated or they may be coated by known techniques to delay disintegration and absorption in the gastrointestinal tract and thereby provide a sustained action over a longer period of time.
For the preparation of fluids for parenteral administration, suitable carriers include sterile aqueous or non-aqueous solutions, suspensions, or emulsions. For parenteral administration, solutions for the practice of the invention may comprise sterile aqueous saline solutions, or the corresponding water soluble pharmaceutically acceptable metal salts, as previously described. For parenteral administration, solutions of the compounds used in the practice of the invention may also comprise non-aqueous solutions, suspensions, emulsions, and the like. Examples of non-aqueous solvents or vehicles are propylene glycol, polyethylene glycol, vegetable oils, such as olive oil and corn oil, gelatin, and injectable organic esters such as ethyl oleate. Such dosage forms may also contain adjuvants such as preserving, wetting, emulsifying, and dispersing agents. They may be sterilized, for example, by filtration through a bacteria-retaining filter, by incorporating sterilizing agents into the compositions, by irradiating the compositions, or by heating the compositions. They can also be manufactured in the form of sterile water, or some other sterile injectable medium immediately before use.
Aqueous solutions may also be suitable for intravenous, intramuscular, intrathecal, subcutaneous, and intraperitoneal injection. The sterile aqueous media employed are all readily obtainable by standard techniques well known to those skilled in the art. They may be sterilized, for example, by filtration through a bacteria-retaining filter, by incorporating sterilizing agents into the compositions, by irradiating the compositions, by heating the compositions, and the like. They can also be manufactured in the form of sterile water, or some other sterile medium capable of injection immediately before use.
Compounds contemplated for use in accordance with the present invention may also be administered in the form of suppositories for rectal or vaginal administration. These compositions may be prepared by mixing the drug with a suitable non-irritating excipient, such as cocoa butter, synthetic glyceride esters of polyethylene glycols, and the like, such materials being solid at ambient temperatures but liquify and/or dissolve in internal cavities to release the drug.
The preferred therapeutic compositions for inocula and dosage will vary with the clinical indication. Some variation in dosage will necessarily occur depending upon the condition of the patient being treated, and the physician will, in any event, determine the appropriate dose for the individual patient. The effective amount of compound per unit dose depends, among other things, on the body weight, physiology, and chosen inoculation regimen. A unit dose of compound refers to the weight of compound without the weight of carrier (when carrier is used).
The route of delivery of compounds and compositions used for the practice of the invention is determined by the disease and the site where treatment is required. Since the pharmacokinetics and pharmacodynamics of compounds and compositions described herein will vary somewhat, the most preferred method for achieving a therapeutic concentration in a tissue is to gradually escalate the dosage 5 and monitor the clinical effects. The initial dose, for such an escalating dosage regimen of therapy, will depend upon the route of administration.
In accordance with invention methods, the medicinal preparation can be introduced parenterally, by dermal application, and the like, in any medicinal form or composition. It is used as a solitary agent of medication or in combination with other medicinal preparations. Single and multiple 10 therapeutic dosage regimens may prove useful in therapeutic protocols.
As employed herein, the phrase "a therapeutically effective amount", when used in reference to invention methods employing heterocyclic compounds and pharmaceutically acceptable salts thereof, refers to a dose of compound sufficient to provide circulating concentrations high enough to impart a beneficial effect on the recipient thereof. The specific therapeutically effective dose level for any 15 particular patient will depend upon a variety of factors including the disorder being treated, the severity of the disorder, the activity of the specific compound used, the route of administration, the rate of clearance of the specific compound, the duration of treatment, the drugs used in combination or coincident with the specific compound, the age, body weight, sex, diet and general health of the patient, and like factors well known in the medical arts and sciences. Dosage levels typically fall in the range 20 of about 0.001 up to 100 mg/kg/day; with levels in the range of about 0.05 up to 10 mg/kg/day being preferred.
In still another embodiment of the invention, there are provided methods for preventing disease conditions in a subject at risk thereof, said method comprising administering to said subject a therapeutically effective amount of at least one of the heterocyclic compounds described above in 25 accordance with invention methods for modulating the activity of excitatory amino acid receptors.
As used herein, the phrase "preventing disease conditions" refers to preventing a disease, disorder or condition from occurring in a subject who may be at risk for the disease, but has not yet been diagnosed as having the disease. Those of skill in the art will understand that a variety of methods may be used to determine a subject at risk for a disease, and that whether a subject is at risk for a disease will depend on a variety of factors known to those of skill in the art, including genetic make-up of the subject, age, body weight, sex, diet, general health, occupation, exposure to environmental conditions, marital status, and the like, of the subject.
Those of skill in the art can readily identify a variety of assays that can be used to assess the activity of excitatory amino acid receptors. For receptor species that activate a second messenger pathway, assays that measure receptor-activated changes in intracellular second messengers can be employed to monitor receptor activity. For example, inhibition of G-protein-coupled metabotropic glutamate receptors by antagonists can lead to inhibition of the glutamate-evoked increase in phosphatidylinositol (PI) hydrolysis, which can be assessed by measuring decreases in glutamate-stimulated products of PI hydrolysis. (See e.g., Berridge et al, (1982) Biochem. J. 206:587-5950; and Nakajima et al., J Biol. Chem. 267:2437-2442 (1992) and Example 23.) Similarly, activation of excitatory amino acid receptors that leads to the release of intracellular calcium or changes in intracellular calcium concentration can also be used to assess excitatory amino acid receptor activity.
Methods of detection of transient increases in intracellular calcium concentration are well known in the art. (See e.g., Ito et al., J Neurochem. 56:531-540 (1991) and Example 22).
Furthermore, for receptor species that mediate analgesia, assays that measure analgesic efficacy can be employed to monitor receptor activity (See Example 24).
The following examples are intended to illustrate but not to limit the invention in any manner, shape, or form, either explicitly or implicitly. While they are typical of those that might be used, other procedures, methodologies, or techniques known to those skill in the art may alternatively be used.
Example 1 Synthesis of 2-(1-Cyclohexen-l-vlethynyl)-1,3-thiazole Triphenylphosphine (570 mg, 2.0 mmol) was dissolved in tetrahydrofuran (THF) (20 mL), then argon was bubbled through the solution for several minutes to deoxygenate if Palladium(II) acetate (120 mg, 0.54 mmol) was added, and the reaction mixture was heated to 60 C for 0.5 h, and then cooled to ambient temperature. Cu! (308 mg, 1.6 mmol), 2-bromo-1,3-thiazole (3.0 g, 18 mmol), 1-ethynylcyclohexene (2.4 g, 20 mmol), potassium carbonate (6 g, 45 mmol) and water (1.0 mL, 58 mmol) were dissolved in 50 mL dimethoxyether (DME) and argon was bubbled through the solution for several minutes to deoxygenate the mixture. The catalyst solution of triphenylphosphine and palladium (II) acetate in THE was added to the reaction flask which was heated to 75 C
for 2h. After 2 h, heating was discontinued and the reaction was allowed to cool to ambient temperature.
After stirring for 16 h, gas chromatography/mass spectrometry (GC/MS) analysis showed the reaction to be complete. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL) and washed with water (200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane then 97:3 hexane:ethyl acetate to afford 2-(1-cyclohexen-l-ylethynyl)-1,3-thiazole (2.56 g, 74%
yield) as a brown oil. 'H NMR
(CDC13, 300 MHz) 8 7.79 (d, J=3.0 Hz, 1H), 7.31 (d, J=3.0 Hz, 1H), 6.37-6.35 (m, 1H), 2.23-2.14 (m, 4H), 1.71-1.57 (m, 4H). MS (ESI) 190.0 (M+H).
Example 2 Synthesis of 2-Methyl-4-(1,3-thiazol-2-yll-3-butyn-2-ol 2-Bromo-1,3-thiazole (6.0 g, 37 mmol) and CuI (1.3 g, 7.3 mmol) were combined in DME (150 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture.
Triethylamine (25 mL, 180 mmol) and PdC12(PPh3)2 (2.5 g, 3.7 mmol) were added and 2-methyl-3-butyne-2-ol (4.6 g, 55 mmol) was added dropwise. After stirring at ambient temperature for 16 h, GC/MS showed the reaction was not complete. The reaction was heated to reflux for 2 h. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (600 mL), washed with water (600 mL), brine (600 mL), dried over Na2SO4, filtered and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane then 7:3 hexane:ethyl acetate to afford 4-(2-thiazolyl)-2-methyl-3-butyn-2-ol contaminated with 2,7-dimethyl-but-3,5-diyne-2,7-diol (the dimer of 2-methyl-3-butyne-2-ol). The product was crystallized from boiling hexane to afford 2-methyl-4-(1,3-thiazol-2-yl)-3-butyn-2-ol (2.18 g, 36% yield) as off white crystals that were contaminated with a small amount of 2,7-dimethyl-but-3,5-diyne-2,7-diol. M.p.
69-70 C. 'H NMR
(CDC13, 300 MHz) S 7.80 (d, J=3.0 Hz, 1H), 7.34 (d, J=3.0 Hz, 1H), 4.40 (s, 1H), 1.65 (s, 6H). MS
(ESI) 168.1 (M++H).
Example 3 Synthesis of 5-Chloro-3-pyridinyl trifluoromethanesulfonate Trifluoromethanesulfonic anhydride (5.0 mL, 30 mmol) was dissolved in CH2Cl2 (100 mL), and cooled to 0 C 5-Chloro-3-pyridinol (3.10 g, 23.9 mmol), and triethylamine (6.5 mL, 47 mmol) were dissolved in CH2C12 (50 mL), and the resulting solution was added to the cold trifluoromethanesulfonic anhydride solution dropwise via cannula. The resulting dark brownish-red solution was stirred at 0 C for 5 minutes, and then the ice bath was removed and the reaction mixture was allowed to warm to ambient temperature. After stirring for 16 h at ambient temperature the reaction was quenched by pouring into water and basified by addition of saturated aqueous sodium carbonate. The basic aqueous phase was extracted with CH2Cl2 (2 x 50 mL), the combined organics were then dried over Na2SO4, filtered and concentrated in vacuo. The resulting black viscous oil was filtered through a plug of silica gel and fractions were collected while eluting with 1:1 hexane:ethyl acetate. Fractions containing the desired product were combined, concentrated in vacuo, and further purified by column chromatography eluting with 15:1 then 10:1 hexane:ethyl acetate to afford 5-chloro-3-pyridinyl trifluoromethanesulfonate (3.68 g, 59% yield) as a golden liquid.
'H NMR (CDC13, 300 MHz) S 8.65 (d, J=2 Hz, 1H), 8.52 (d, J=2 Hz, 1H), 7.70 (t, J=3 Hz, 1H). MS
(ESI) 261 (M+, "Cl), 263 (M+, 31C1).
Example 4 Synthesis of 3-Chloro-5-f(trimethylsilyl)ethynylipyridine 5-Chloro-3-pyridinyl trifluoromethanesulfonate (4.0 g, 15 mmol) and Cul (580 mg, 3.0 mmol) were combined in DME (100 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (10.6 mL, 76.5 mmol), and PdC12(PPh3)2 (1.1g, 1.5 mmol) were added, then trimethylsilyl-acetylene (3.3 ml; 23 mmol) was added dropwise. The reaction mixture was stirred at ambient temperature for 1 h at which time GC/MS
analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 99:1 hexane:ethyl acetate to afford 3-chloro-5-[(trimethylsilyl)ethynyl]pyridine (2.8 g, 87% yield) as a brown solid. 'H NMR (CDC13, 300 MHz) 8 8.51 (s, 1H), 8.44 (s, 1H), 7.70(s, 1H), 0.22 (s, 9H). MS (EI ionization) 209 (M').
Example 5 Synthesis of 3-Chloro-5-ethynylpyridine 3-Chloro-5-[(trimethylsilyl)ethynyl]pyridine (1.4g, 6.7mmol) was dissolved in methanol (15 ml) and cooled to 0 C, to the resulting solution was added potassium carbonate (93 mg, 0.67 mmol).
The ice bath was removed and the reaction mixture was stirred at ambient temperature for 0.5 h at which time thin layer chromatography (TLC) and GC/MS analysis indicated that the reaction was complete. The solvent was removed in vacuo and the residue was dissolved in diethyl ether (50 mL), washed with water (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo to afford 3-chloro-5-ethynylpyridine (822mg, 90% yield) which was pure by GC/MS
analysis. MS (El ionization) 137 (35C1 M), 139 (37C1 M+). This material was carried on to the next step without further purification.
Example 6 Synthesis of 3-Chloro-5-(1.3-thiazol-2-ylethynyl)pyridine 2-Bromo-1,3-thiazole (980 mg, 6.0 mmol) and Cu! (230 mg, 1.2 mmol) were combined in DME (15 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (4.2 mL, 30 mmol) and PdC12(PPh3)2 (420 mg, 0.60 mmol) were added, then 3-chloro-5-ethynylpyridine (820 mg, 19 mmol) was added dropwise. After stirring at ambient temperature for 16 h, GC/MS analysis showed starting material remaining. The reaction mixture was heated at reflux for 2 h. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (100 mL), and washed with water (100 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 9:1 hexane:ethyl acetate to afford 3-chloro-5-(1,3-thiazol-2-ylethynyl)pyridine which contained some dimer. This material was crystallized from hot ethyl acetate to afford 3-chloro-5-(1,3-thiazol-2-ylethynyl)pyridine (300 mg 23% yield) as light orange crystals M.p. 124-125 C. 'H
NMR (CDC13, 300 MHz) 6 8.70 (d, J=1.5 Hz, 1H), 8.59 (d, J=3.0 Hz, 1H), 7.93 (d, J=3.0 Hz, 1H), 7.88 (t, J=2.0 Hz, I H), 7.48 (d, J=3.0 Hz, 2H). MS (ESI) 221.1 (M++H).
Example 7 Synthesis of 2-(Cyclohexylethynyl)-1,3-thiazole 2-Bromo-l,3-thiazole (3.1 g, 19 mmol) and CuI (290 mg, 1.5 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (13 mL, 95 mmol) and PdC12(PPh3)2 (530 mg, 0.76 mmol) were added and cyclohexylethyne (2.0 g, 19 mmol) was added dropwise. The reaction mixture was stirred at ambient temperature for 16 h at which time GC/MS analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane then 99:1 hexane:ethyl acetate to afford 2-(cyclohexylethynyl)-1,3-thiazole (1.6 g, 44% yield) as a yellow oil. 'H NMR
(CDC13, 300 MHz) S 7.76 (d, J=9.0 Hz, 1H), 7.28 (d, J=3.0 Hz, 1H), 2.68-2.59 (m, 1H), 1.91-1.28 (m, 1OH). MS (ESI) 191.7 (M).
Example 8 Synthesis of 2-(1-Pentynyl)-1,3-thiazole 2-Bromo-1,3-thiazole (2.0 g, 12 mmol) and Cu! (183 mg, 0.96 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8 mL, 60 mmol) and PdC12(PPh3)2 (337 mg, 0.48 mmol) were added and 1-pentyne (979 mg, 14.4 mmol) was added dropwise. The reaction mixture was stirred at ambient temperature for 6 h at which time GC/MS analysis indicated that the reaction was not complete.
Additional 1-pentyne (3.0 mL, 29 mmol) was added and the reaction was heated to 35 C under a condenser. After heating for 16 h, GC/MS analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane, 99:1, then 97:3 hexane:ethyl acetate to 2-(1-pentynyl)-1,3-thiazole (820 mg, 44% yield) as a yellow oil. 'H
NMR (CDC13, 300 MHz) S 7.76 (d, J=3.0 Hz, 1H), 7.28 (d, J=3.0 Hz, 1H), 2.47-2.42 (m, 2H), 1.68-1.60 (m, 2H), 1.08 - 0.99 (m, 3H). MS (ESI) 151.6 (M+).
Example 9 5 Synthesis of 2-(3-Cyclohexyl-l-propynyl)-1,3-thiazole 2-Bromo-1,3-thiazole (2.0 g, 12 mmol) and Cul (185 mg, 0.97 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.5 mL, 61 mmol) and PdC12(PPh3)2 (340 mg, 0.49 mmol) were added and 3-cyclohexyl-l- propyne (2.9 g, 24 mmol) was added dropwise. The reaction was stirred at ambient 10 temperature for 16 h at which time GC/MS analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane, then 98:2 hexane:ethyl 15 acetate to afford 2-(3-cyclohexyl-l-propynyl)-1,3-thiazole (1.14 g, 46%
yield) as a yellow oil. 'H NMR
(CDC13, 300 MHz) S 7.76 (d, J=3.0 Hz, 1H), 7.27 (d, J=3.0 Hz, 1H), 2.35 (d, J=6 Hz, 2H), 1.89-1.61 (m, 5H), 1.3 - 1.03 (m, 6H). MS (ESI) 205.9 (M++H).
Example 10 Synthesis of 2-(1-Cyclohexen-l-vlethynyl)-5-nitro-1,3-thiazole 20 2-Bromo-5-nitro-1,3-thiazole (2.5 g, 12 mmol) and Cul (460 mg, 2.5 mmol) were combined in DME (30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.4 mL, 60 mmol) and PdC12(PPh3)2 (840 mg, 1.2 mmol) were added and 1-ethynycyclohexene (1.5 g, 14.4 mmol) was added dropwise. The reaction was heated under reflux for 16 h at which time GC/MS analysis indicated that the reaction was complete.
The mixture was filtered 25 through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, 99:1 then 98.5:1.5 hexane:ethyl acetate to afford 2-(1-cyclohexen-l-ylethynyl)-5-nitro-1,3-thiazole (1.4 g, 51.8% yield) as a yellow powder. M.p.
30 85-86 C. 'H NMR (CDC13, 300 MHz) S 8.5 (s, 1H), 6.52 (br s, 1H), 2.24 (br s, 4H), 1.63 (br s, 4H). MS
(ESI) 235.1 (M++H).
Example 11 Synthesis of 2-(3,3-Dimethyl-l-butynyl)-1,3-thiazole Triphenylphosphine (380 mg, 1.5 mmol) was dissolved in THE (20 mL), then argon was bubbled through the solution for several minutes to deoxygenate it.
Palladium(II) acetate (82 mg, 0.37 mmol) was added, and the reaction mixture was heated to 60 C for 0.5 h, and then cooled to ambient temperature. Cul (210 mg, 1.1 mmol), 2-bromo-1,3-thiazole (1.6 g, 9.8 mmol), potassium carbonate (4.2 g, 31 mmol) and water (0.70 mL, 39 mmol) were dissolved in DME (30 mL) and argon was bubbled through the mixture for several minutes to deoxygenate the mixture.
3,3-dimethyl-I-butyne (1.0 g, 12.2 mmol) was then added to mixture. The catalyst solution of triphenylphosphine and palladium (II) acetate in THE was added to the reaction flask which was heated to 30 C for 2h. After this time heating was discontinued and the mixture was allowed to stir at ambient temperature. After stirring for 16 h, GC/MS analysis showed the reaction to be complete. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with water (200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, then 99:1 hexane:ethyl acetate to afford 2-(3,3-dimethyl-l-butynyl)-1,3-thiazole (0.45 g, 28% yield) as a yellow oil. 'H
NMR (CDC13, 300 MHz) S 7.74 (d, J=3.0 Hz, IH), 7.28 (d, J=3.0 Hz, 1H), 1.33 (s, 9H). MS (ESI) 166.1 (M++H).
Example 12 Synthesis of 1-(1,3-Thiazol-2-ylethynyl)cyclopentanol 2-Bromo-1,3-thiazole (3.1 g, 19 mmol) and Cul (360 mg, 1.9 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (13 mL, 94 mmol) and PdC12(PPh3)2 (660 mg, 0.94 mmol) were added and 1-ethynycyclopentanol (2.5 g, 23 mmol) was added dropwise. The reaction was heated at 50 C for 16 h at which time GC/MS analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate.
The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, 6:1 then 3:1 hexane:ethyl acetate to afford 1-(1,3-thiazol-2-ylethynyl)cyclopentanol (2.3 g, 52% yield) as a yellow powder. 'H NMR (CDC13, 300 MHz) 8 7.80 (d, J=3 Hz, 1H), 7.65 (d, J=3 Hz, 1H), 2.04-1.73 (m, 10.8H). MS
(EI ionization) 193 (M+).
Example 13 Synthesis of 2-(1-Cyclopenten-l-ylethynyl)-1,3-thiazole 1-(1,3-Thiazol-2-ylethynyl)cyclopentanol was dissolved in pyridine (20 ml) and phosphorus oxychloride (1.2 g, 6.2 mmol) was added dropwise under argon. The reaction was stirred at ambient temperature for lh at which time a precipitate had appeared. At this time GUMS
analysis indicated that the reaction was complete and the pyridine was removed in vacuo. The residue was dissolved in ethyl acetate (200 mL) and washed with water (200 mL), brine (200 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 99:1 hexane:ethyl acetate to 2-(1-cyclopenten-1-ylethynyl)-1,3-thiazole (0.25 g, 24% yield) as a light brown solid. M.p. 70.5-72 C, 'H NMR (CDC13, 300 MHz) S 7.80 (d, J=3.0 Hz, 1H), 7.34 (d, J=3.OHz, 1H), 6.31-6.30 (m, 1H), 2.60-2.45 (m, 4H), 2.00-1.90 (m, 2H). MS
(ESI) 176.1 (M++H).
Example 14 Synthesis of Methyl 3-(1,3-thiazol-2-yl)-2-propynyl ether 2-Bromo-1,3-thiazole (2.0 g, 12 mmol) and Cul (456 mg, 2.4 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.6 mL, 60 mmol) and PdC12(PPh3)2 (842 mg, 1.2 mmol) were added and methyl propargyl ether (1.00 g, 14.4 mmol) was added dropwise. The reaction was stirred at 55 C
under a condenser. After stirring at 55 C for 16 h, GC/MS analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, 99:1, 97:3, then 96:4 hexane:ethyl acetate to afford methyl 3-(1,3-thiazol-2-yl)-2-propynyl ether (250 mg, 13% yield) as a yellow oil. 'H NMR (CDC13, 300 MHz) S 7.78 (d, J=3.0 Hz, 1H), 7.37 (d, J=3.0 Hz, IH), 4.37 (s, 2H), 3.47 (s, 3H). MS (ESI) 154.1 (M++H).
Example 15 Synthesis of 2-Methyl-4-(3-pyridinyl)-3-butyn-2-ol 3-Bromopyridine (3.0 mL, 31 mmol), triethylamine (22 mL, 160 mmol), Cu! (1.2 g, 6.2 mmol), and PdC12(PPh3)2 (1.1 g, 1.5 mmol) were combined in DME (92 mL) and cooled to 0 C. 2-Methyl-3-butyne-2-ol (9.0 mL, 93 mmol) was then added and the reaction was allowed to slowly warm to ambient temperature. The mixture was then heated to 55-60 C for 16 h. The mixture was filtered through CeliteTM, and the pad was washed thoroughly with ethyl acetate. The combined filtrates were washed with brine (3 x 100 mL), dried over MgSO4i and filtered. The solution was concentrated in vacuo, and the residue was purified by column chromatography eluting with 90:10 hexane:ethyl acetate then ethyl acetate to afford 2-methyl-4-(3-pyridinyl)-3-butyn-2-ol (2.0 g, 40%
yield) as a brown oil 'H
NMR (CDC13, 300 MHz) S 8.76 (br s, 1H), 8.52 (br s, 1H), 7.74-7.70 (m, 1H), 4.08 (br s, 1H), 1.63 (s, 3H). MS (EI ionization) 161 (M).
Example 16 Synthesis of 3-Ethynylpyridine 2-Methyl-4-(3-pyridinyl)-3-butyn-2-ol (611 mg, 3.79 mmol) was dissolved in toluene (12 mL) at ambient temperature. A small amount (spatula tip) of NaH (60% dispersion in mineral oil) was added, and the reaction was heated to reflux. After 15 minutes the reaction was cooled to ambient temperature, and quenched by the addition of 1M aqueous HC1 (30 mL). Crude product from a previous preparation (-200 mg) was added to the workup mixture. The acidic aqueous was extracted with ethyl acetate (2 x 20 mL), basified by the addition of saturated aqueous NaHCO3, and extracted with CH2CI2. The CH2CI2 extracts were dried over MgSO4i filtered, and concentrated in vacuo to afford crude 3-ethynylpyridine (1.5 g, >100%) as a brown liquid., 'H NMR
(CDC13, 300 MHz) S 8.73 (br s, 1H), 8.58 (br s, 1H), 7.80-7.76 (m, 1H), 7.29-7.16 (m, 1H), 3.28 (s, 1H). A portion of this material was carried on to the next step without further purification.
Example 17 Synthesis of 3-(1,3-Thiazol-2-ylethynyl)pyridine 2-Bromo-1,3-thiazole (0.15 mL, 1.6 mmol), Cu! (98 mg, o.51 mmol), PdC12(PPh3)2 (120 mg, 0.17 mmol) and triethylamine (2.8 mL, 20 mmol) were combined in DMF (6.8 mL) and cooled in an ice bath. 3-Ethynylpyridine (520 mg, 5.04 mmol) was then added to the mixture as a solution in DMF
(3.0 mL). The ice bath was removed and the reaction was allowed to stir at ambient temperature for 16 h. The reaction mixture was filtered through a pad of CeliteTM, and the pad was washed thoroughly with ethyl acetate. The filtrate was washed with brine (3 x 20 mL). A partial emulsion was observed.
The mixture was concentrated in vacuo and the residue was taken up in CH2C12, washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 80:20 followed by 30:20 hexane:ethyl acetate to afford 3-(1,3-thiazol-2-ylethynyl)pyridine (160 mg) as a mixture with another product exhibiting a mass of 204 in the GCIMS, assigned as pyridylalkyne dimer. A portion of the mixture (100 mg) was further purified by preparative reverse-phase HPLC eluting with a gradient of 80:20 to 0:100 water:acetonitrile over twenty minutes. The fractions containing the desired product were collected (detection by uv at 210 nm) to afford 3-(1,3-thiazol-2-ylethynyl)pyridine as a white waxy solid (15 mg). 'H NMR (CDC13, 300 MHz) 8 9.3-8.5 (br s, 2 H), 7.92-7.90 (m, 2H), 7.50-7.30 (m, 2H). MS (ESI) 187.0 (M++H).
Example 18 Synthesis of 3,3.5.5-Tetramethyl-l-(2-pyridinylethynyl)cyclohexanol.
To a solution of 2-ethynylpyridine (1.0 g, 10 mmol) in THE at -78 C was added a 1.0 M
solution of ethyl magnesium bromide in THE (10 mL, 10 mmol). After stirring at reduced temperature for 30 minutes a solution of 3,3,5,5-tetramethylcyclohexanone (1.5 g, 10 mmol) in THE was added rapidly. The mixture was allowed to warm to ambient temperature over 16 hours, then partitioned between water and ethyl acetate. The organic layer was dried over anhydrous Na2SO4, and concentrated in vacuo. The resultant product was purified by flash column chromatography on silica gel eluting with 1:1 hexane:ethyl acetate to afford 3,3,5,5-tetramethyl-l-(2-pyridinylethynyl)cyclohexanol (250 mg, 10% yield) as a white solid. M.p.
126-127 C. 'H NMR
(DMSO-d6, 300 MHz) S 8.57 (m, 1H), 7.64 (m, 1H), 7.39 (d, J=5 Hz, 1H), 7.22 (m, 1H), 1.91 (d, J=9 Hz, 2H), 1.71 (d, J=9 Hz, 2H), 1.26 (s, 2H), 1.14 (s, 6H), 1.09 (s, 6H).
Example 19 Synthesis of 2-[(3.3 5,5-Tetramethyl-l-cyclohexen-1-yl)ethynyllpyridine 3,3,5,5-Tetramethyl-l-(2-pyridinylethynyl)cyclohexanol (200 mg, 0.78 mmol) was dissolved in pyridine. POC13 (153 mg, 1.0 mmol) was added, and the mixture was heated to reflux for 6 h. After cooling, the POC13 and pyridine were removed in vacuo. The residue was purified by flash column chromatography on silica gel eluting with 2:1 hexane:ethyl acetate to afford 2-[(3,3,5,5-tetramethyl-l-cyclohexen-l-yl)ethynyl]pyridine (148 mg, 80% yield) as a light tan solid.
M.p. 55-56 C. 'H NMR
(CDC13, 300 MHz) 8 8.56 (m, 1H), 7.62 (m, 1H), 7.40 (d, J=7 Hz, 1H), 7.18 (m, 1H), 6.09 (s, 1H), 2.00 (s, 2H), 1.35 (s, 2H), 1.05 (s, 6H), 0.99 (s, 6H).
Example 20 Synthesis of 2-[(5-Methyl-l-cyclohexen-1-yIlethynyl]pyridine and 2-[(3-methyl-l-cyclohexen-1-yl)ethynyllpyridine (111) Using the procedures for Examples 18 and 19 but with the appropriate starting materials, 2-[(5-methyl-l-cyclohexen-1-yl)ethynyl]pyridine and 2-[(3-methyl-l-cyclohexen-1-yl)ethynyl]pyridine were obtained as a mixture of racemic regioisomers. 'H NMR (CDC13, 300 MHz) 8 8.56 (m, 1H), 7.62 (m, 1H), 7.40 (m, 1H), 7.19 (m, 1H), 6.32 (s, 0.5H), 6.20 (s, 0.5 H), 2.25 (m, 3H), 1.73 (m, 3H), 1.22 (m, 1H), 1.01 (m, 3H). MS (EI ionization) Two peaks: 197 (M).
Example 21 General procedure for 2-pyridylenynes To a cooled a solution of 2-ethynylpyridine in THE to -78 C was added n-BuLi (1.6 M in hexane, 1 equiv). After 20 minutes stirring at reduced temperature this material was mixed with a 5 solution of the appropriate ketone (1 equiv) in THF. The solution was allowed to warm slowly to ambient temperature. The reaction mixture was then quenched and partitioned between water and ethyl acetate. The organic layer was dried over Na2SO4, and concentrated in vacuo.
The resultant product was purified by flash column chromatography on silica gel eluting with 1:1 hexane:ethyl acetate. The resulting product was dissolved in pyridine or a mixture of pyridine and methylene chloride (1:1).
10 POC13 (1.2 equiv) was added and the solution refluxed for 4 to 8 hours. The resultant mixture was partitioned between IM K2CO3 and ethyl acetate. The organic layer was dried over Na2SO4, and concentrated in vacuo. The resultant product was purified by flash column chromatography on silica gel eluting with 2:1 hexane:ethyl acetate.
Using this general procedure the following invention compounds (see Examples 22-33) were 15 obtained.
Example 22 Synthesis of 2-[(4-Methyl-l-cyclopenten-1-yl)ethynyl]pyridine and 2- [ -Methyl-1-cyclopenten-l-yl ethynyllpyridine (1:1) Reactants: 2-ethynylpyridine (620 mg, 6.0 mmol), 3-methylcyclopentanone (0.64 mL, 6.0 20 mmol); yields 2-[(4-methyl-l-cyclopenten-1-yl)ethynyl]pyridine and 2-[(3-methyl-l-cyclopenten-l-yl)ethynyl]pyridine (1:1) as a transparent oil (200 mg, 18% overall yield), as mixture of regio- and stereoisomers. 'H NMR (CDC13, 300 MHz) 8 8.56 (m, 1H), 7.64 (m, 1H), 7.44 (m, 1H), 7.20 (m, 1H), 6.19 (m, 0.5H), 6.18 (m, 0.5H), 2.90 (m, 0.5H), 2.70 (m, 2.5H), 2.21 (m, 2H), 1.48 (m, 0.5H), 1.08 (app d, J= 7.5Hz, 3H). Two peaks: 182 (W), 167 (M+-Me).
25 Example 23 Synthesis of 2-(Bicyclo[ .2.llhept-2-en-2-ylethynyl)pyridine Reactants: 2-ethynylpyridine (1.0 g, 10.0 mmol), norcamphor (1.1 g, 10.0 mmol); yields 2-(bicyclo[2.2.1]hept-2-en-2-ylethynyl)pyridine as a black oil (215 mg, 11% over two steps). This material was mixed with fumaric acid (128 mg, 1.11 mmol), dissolved in Methanol and the resulting 30 solution was concentrated in vacuo to afford a dark brown solid. This was triturated with a mixture of ethyl acetate:ethanol (1:1) and the resultant solids were partitioned between aqueous K2CO3 and ethyl acetate. The organics were dried over Na2SO4, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with 2:1 hexane:ethyl acetate to afford 2-(bicyclo[2.2.1 ]hept-2-en-2-ylethynyl)pyridine (30 mg, 1.5 % overall yield) as a translucent brown oil.
'H NMR (DMSO-d6, 300 MHz) 8 8.58 (d, J= 5Hz, 1H), 7.64 (m, 1H), 7.40 (m, 1H), 7.19 (m, 1H), 6.48 (d, J=4Hz, 1H), 3.07 (s, 1H), 2.97 (s, 1H), 1.76 (m, 2H), 1.51 (m, 1H), 1.23 (m, 1H), 1.11 (m, 1H). MS
(EI ionization) 195 (M+).
Example 24 Synthesis of 2-[(2.6-Dimethyl-1-cyclohexen-1-yl)ethynyl]pyridine Reactants: 2-ethynylpyridine (5.0 mmol, 515 mg), 2,6-dimethylcyclopentanone (6.0 mmol, 0.82 mL); yields 2-[(2,6-dimethyl-l-cyclohexen-1-yl)ethynyl]pyridine as a transparent oil (200 mg, 19% overall yield). 'H NMR (CDC13, 300 MHz) 8 8.56 (m, 1H), 7.60 (m, 1H), 7.42 (m, 1H), 7.19 (m, 1H), 2.40 (m, 1H), 2.10 (m, 2H), 2.01 (s, 3H), 1.76 (m, 2H), 1.56 (m, 1H), 1.34 (m, 1H), 1.22 (app d, J= 7 Hz, 3H). MS (EI ionization) 211 (M).
Example 25 Synthesis of 2-(1-Cyclohepten-1-ylethynyl)pyridine Reactants: 2-ethynylpyridine (5.0 mmol, 515 mg), cycloheptanone (6.0 mmol, 0.71 mL); yields 2-(1-cyclohepten-1-ylethynyl)pyridine as a transparent oil (200 mg, 18%
overall yield). 'H NMR
(CDC13, 300 MHz) 8 8.54 (m, 1H), 7.59 (m, 1H), 7.40 (m, 1H), 7.16 (m, 1H), 6.52 (t, J= 7 Hz, 1H), 2.47 (m, 2H), 2.26 (m, 2H), 1.77 (s, 2H), 1.61 (m, 2H), 1.56 (m, 2H). MS (EI
ionization) 197 (M1).
Example 26 Synthesis of 2-(1-Cycloocten-1-ylethynyl)pyridine Reactants: 2-ethynylpyridine (515 mg, 5.0 mmol), cyclooctanone (756 mg, 6.0 mmol); yields 2-(1-cycloocten-1-ylethynyl)pyridine as a transparent oil (250 mg, 24% overall yield).'H NMR (CDC13, 300 MHz) 6 8.57 (m, 1H), 7.62 (m, 1H), 7.40 (m, 1H), 7.18 (m, 1H), 6.33 (t, J=
7 Hz, IH), 2.41 (m, 2H), 2.23 (m, 2H), 1.66 (s, 2H), 1.52 (br m, 6H). MS (EI ionization) 211 (M).
Example 27 Synthesis of 2-[(4-Methyl-l-cyclohexen-1-yl)ethynyl]pyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), 4-methylcyclohexanone (6.0 mmol, 672 mg); yields 2-[(4-methyl-l-cyclohexen-1-yl)ethynyl]pyridine as a transparent oil (250 mg, 21% overall yield). 'H NMR (CDC13, 300 MHz) 6 8.57 (m, 1H), 7.59 (m, 1H), 7.39 (m, 1H), 7.20 (m, 1H), 6.30 (m, 1H), 2.22 (m, 3H), 1.72 (m, 3H), 1.25 (m, 1H), 0.99 (m, 3H). MS (EI
ionization) 197 (M).
Example 28 Synthesis of 2-(3,6-Dihydro-2H-thiopyran-4-ylethynyl)pyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), tetrahydrothiopyran-4-one (6.0 mmol, 696 mg); yields 2-(3,6-dihydro-2H-thiopyran-4-ylethynyl)pyridine as a transparent oil (150 mg, 12%
overall yield). 'H NMR (CDC13, 300 MHz) S 8.57 (m, 1H), 7.61 (m, 1H), 7.40 (m, 1H), 7.21 (m, 1H), 6.46 (m, 1H), 3.27 (m, 2H), 2.78 (m, 2H), 2.57 (m, 2H). MS (EI ionization) 201 (M).
Example 29 Synthesis of 2 X3.6-Dihydro-2H-pyran-4-ylethynyl)pyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), tetrahydro-4H-pyran-4-one (6.0 mmol, 600 mg); yields 2-(3,6-dihydro-2H-pyran-4-ylethynyl)pyridine as a transparent oil (200 mg, 18% overall yield). 'H NMR (CDC13i 300 MHz) 8 8.57 (m, 1H), 7.63 (m, 1H), 7.44 (m, 1H), 7.21 (m, 1H), 6.29 (m, 1H), 4.25 (m, 2H), 3.81 (m, 2H), 2.36 (m, 2H). MS (EI ionization) 185 (M+).
Example 30 Synthesis of 2-{[(1R)-1,7,7-Trimethylbicyccl [2 2.11 heat-2en-2-yl]ethynl}pyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), (1R)-(+)-camphor (6.0 mmol, 912 mg);
yields 2-{[(1R)-1,7,7-trimethylbicyclo[2.2.1]hept-2-en-2-yl]ethynyl}pyridine as a transparent yellow oil (125 mg, 9% overall yield). 'H NMR (CDC13, 300 MHz) 6 8.57 (m, 1H), 7.64 (m, 1H), 7.43 (m, 1H), 7.17 (m, 1H), 6.49 (d, J= 3Hz, 1H), 2.41 (t, J= 3Hz, 1H), 1.92 (br m, 1H), 1.65 (m, 1H), 1.18 (m, 1H), 1.17 (s, 3H), 1.09 (br m, 1H), 0.84 (s, 3H), 0.82 (s, 3H). MS (El ionization) 237 (M).
Example 31 Synthesis of 2- [(3.5-Dimethyl-l-cyclohexen-l-y1)ett ynyllpyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), 3,5-dimethylcyclohexanone (6.0 mmol, 0.85 mL); yields 2-[(3,5-dimethyl-l-cyclohexen-1-yl)ethynyl]pyridine as a transparent yellow oil (500 mg, 39% overall yield) as a mixture of diastereomers.'H NMR (CDC13, 300 MHz) 6 8.57 (m, 1H), 7.62 (m, 1 H), 7.40 (m, 1 H), 7.19 (m, 1 H), 6.15 (br s, 1 H), 2.29 (m, 2H), 1.80 (br m, 2H), 1.00 (m, 6H), 0.88 (br m, 2H). MS (El ionization) 211 (M).
Example 32 Synthesis of 2-{[(5R)-5-Methyl-l-cvclohexen-1-yllethynyl}pyridine compound with 2-{f(3R)-3-methyl-l-cvclohexen-l-yllethynyl}pyridine (1:1) Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), (3R)-(+)-3-methylcyclohexanone (6.0 mmol, 0.73 mL); yields 2-{[(5R)-5-methyl-l-cyclohexen-1-yl]ethynyl}pyridine and 2-{[(3R)-3-methyl-l-cyclohexen-1-yl]ethynyl}pyridine (1:1) as a transparent yellow oil (440 mg, 37% overall yield) as a mixture of regioisomers. 'H NMR (CDC13i 300 MHz) 58.56 (m, 1H), 7.62 (m, 1H), 7.40 (m, 1H), 7.18 (m, 1H), 6.31 (m, 0.5H), 6.19 (m, 0.5H), 2.30 (m, 3H), 1.85 (m, 2.5H), 1.22 (m, 1H), 0.98 (m, 3.5H).
MS (El ionization) 197 (M) two peaks resolved.
Example 33 Synthesis of 2-f(3E)-3-Methyl-3-penten-l-vnvllpyridine, 2-(3-ethyl-3-buten-l-ynyl)pyridine and 2-f (3Z)-3-methyl-3-penten-l-ynyllpyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), 2-butanone (6.0 mmol, 0.54 mL); yields 2-[(3E)-3-methyl-3-penten-1-ynyl]pyridine, 2-(3-ethyl-3-buten-1-ynyl)pyridine and 2-[(3Z)-3-methyl-3-penten-1-ynyl]pyridine as a transparent oil (135 mg, 14% overall yield) as a mixture of E, Z and exo-methylene isomers. 'H NMR (CDC13, 300 MHz) 58.59 (m, 1H), 7.65 (m, 1H), 7.44 (m, 1H), 7.20 (m, 1H), 5.88 (m, 0.75H), 5.53 (s, 0.33H) 5.40 (s, 0.33 H), 2.29 (q, J= 7Hz, 0.65H), 1.93 (m, 4.5H), 1.17 (t, J= 714z, 1 H). MS (El ionization) 157 (M+) two peaks resolved.
Example 34 Synthesis of 5-Ethyl-2-(phenylethynyl)pyrimidine hydrochloride 2-Chloro-5-ethylpyrimidine (500 mg, 3.5 mmol), PdC12(PPh3)2 (250 mg, 0.35 mmol), Cul (203 mg, 1.06 mmol), triethylamine (6.0 mL, 43 mmol), and n-Bu4NI (3.85 g, 10.4 mmol) were combined in dimethylformamide (DMF) (30 mL). The mixture was cooled in an ice bath and then phenylacetylene (1.5 mL, 14 mmol) was added. The reaction mixture was then heated to 45-50 C
and after 1.5 h, additional phenylacetylene (1.5 mL, 14 mmol) was added. After an additional 17 h the reaction was diluted with ethyl acetate, washed with brine (4 x 15 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The resulting black oil was purified by column chromatography eluting with hexane then 90:10 hexane:ethyl acetate to afford 5-ethyl-2-(phenylethynyl)pyrimidine (770 mg, >100%) as a black oil. MS (El ionization) 208 (M). This material was carried on to the salt formation without further purification.
5-Ethyl-2-(phenylethynyl)pyrimidine (730 mg, 3.7 mmol) was dissolved in CH2C12 (3.0 mL) and treated with HCI in diethyl ether (4.1 mL of a IN solution, 4.1 mmol).
Upon addition of the HCI
solution a solid precipitated from the solution. The mixture was diluted with diethyl ether (2 mL) and the supernatant decanted. The resultant solid was dried under high vacuum at 50 C to afford 5-ethyl-2-(phenylethynyl)pyrimidine hydrochloride (450 mg, 49 % yield) as an orange solid. M.p. 101-104 C. 'H
NMR (CD3OD, 300 MHz) S 8.75 (s, 2H), 7.58-7.55 (m, 2H), 7.41-7.32 (m, 3H), 2.67 (q, J=7.6 Hz, 2H), 1.21 (t, J=7.6 Hz, 3H).
Example 35 Synthesis of 4,6-Dimethoxy-2-(phenylethynyl)pyrimidine hydrochloride 2-Chloro-4,6-dimethoxypyrimidine (500 mg, 2.9 mmol), PdC12(PPh3)2 (200 mg, 0.28 mmol), CuI (160 mg, 0.84 mmol), triethylamine (4.8 mL, 34 mmol), and n-Bu4NI (3.2 g, 8.7 mmol) were combined in DMF (24 mL). The mixture was cooled in an ice bath and then phenylacetylene (1.25 mL, 11.4 mmol) was added. The reaction mixture was allowed to warm to ambient temperature. After 2.5 h at ambient temperature the reaction mixture was heated to 45-50 C. After 2 h, additional phenylacetylene (1.0 mL, 9.1 mmol) was added. After an additional 17 h stirring at 45-50 C, the reaction mixture was filtered through a pad of CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were washed with brine (4 x 20 mL), dried over MgSO4, filtered and concentrated in vacuo. The resulting black oil was purified by column chromatography eluting with hexane, 90:10, then 85:15 hexane:ethyl acetate to afford product contaminated with an impurity.
Careful column chromatography of this impure material eluting with hexane then 90:10 hexane:ethyl acetate afforded 4,6-dimethoxy-2-(phenylethynyl)pyrimidine (320 mg, 46% yield) as a yellow solid.
This material was carried on to the salt formation without further purification.
4,6-Dimethoxy-2-(phenylethynyl)pyrimidine (320 mg, 1.3 mmol) was dissolved in CH2C12 (1.0 mL), and treated with HC1 in diethyl ether (1.6 mL of a 1.OM solution, 1.6 mmol). A yellow solid precipitated immediately. The mixture was diluted with ethyl acetate and allowed to stand in the freezer for 16 h. The cold supernatant was decanted and the remaining solids were triturated with ethyl acetate (1.5 mL), and then hexane (3 x 2 mL). The remaining solid was dried in vacuo to afford 4,6-dimethoxy-2-(phenylethynyl)pyrimidine hydrochloride (174 mg, 47 % yield) as a yellow solid. M.p.
137-138. 'H NMR (CD3OD, 300 MHz) S 7.65-7.62 (m, 2H), 7.46-7.42 (m, 3H), 6.16 (s, 1H), 3.97 (s, 6H).
Example 36 Synthesis of 2-[(E)-2-(3-Fluorophenyl)ethenyll-6-methylpyrazine 2,6-Dimethylpyrazine (5.0 g, 46 mmol) was dissolved in THE (200 mL) and cooled to 0 C.
Potassium t-butoxide (46 mL of a 1.OM solution in THF, 46 mmol) was added to afford a dark red solution. The solution was allowed to warm to ambient temperature and stir for 1 hr. The solution was then cooled to 0 C, and 3-fluorobenzaldehyde (4.9 mL, 46 mmol) was added via syringe pump over 2 h. The reaction was then allowed to slowly warm to ambient temperature. After stirring at ambient temperature for 18 h, the reaction mixture was cooled to 0 C and quenched by the addition of concentrated aqueous HCl (10 mL). The resulting suspension was allowed to warm to ambient temperature for 15 minutes, then cooled to 0 C and brought to pH=8 by addition of solid NaHCO3. The 5 layers were separated, and the aqueous layer was extracted with ethyl acetate (3 x 200 mL). The combined organic layers were washed with brine (200 mL), dried over MgSO4i filtered, and concentrated in vacuo. The crude product was purified by column chromatography eluting with 90:10, 85:15, then 80:20 hexane:ethyl acetate to afford 2-[(E)-2-(3-fluorophenyl)ethenyl]-6-methylpyrazine (4.14 g, 42% yield) as a light yellow solid. M.p. 43-44 C. 'H NMR (CDC13, 300 MHz) S 8.44 (s, 1H), 10 8.31 (s, 1H), 7.29 (d, J=16 Hz, 1H), 7.37-7.26 (m, 3H), 7.12 (d, J=16 Hz, 1H), 7.05-6.98 (m, 1H), 2.59 (s, 3H). MS (ESI) 214.5 (M+). This material was carried on to the next step without further purification.
Example 37 Synthesis of 2-[1,2-Dibromo-2-(3-fluorophenyl)ethyll-6-methylpyrazine 2-[(E)-2-(3-Fluorophenyl)ethenyl]-6-methylpyrazine from Example 36 (4.14 g, 19.3 mmol) 15 was dissolved in CC14 (40 mL). To this solution was added a solution of bromine (1.2 mL, 23 mmol) in CC14 (20 mL). The brown mixture was then heated to 60 C. After 6h the suspension was treated with saturated aqueous NaHCO3 (200 mL) and diluted with ethyl acetate (700 mL). The organic layer was washed with 5% aqueous Na2S203 (100 mL), brine (100 mL), dried over MgSO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography eluting with 80:20 20 hexane:ethyl acetate then 95:5, 94:6, and 90:10 CH2C12:ethyl acetate to afford 2-[1,2-dibromo-2-(3-fluorophenyl)ethyl]-6-methylpyrazine (2.97 g, 17% over two steps) as a white solid. This material was carried on to the next step without further purification.
Example 38 Synthesis of 2-[(3-Fluorophenyl)ethynyll-6-methvlpyrazine hydrochloride 25 2-[1,2-Dibromo-2-(3-fluorophenyl)ethyl]-6-methylpyrazine (2.97 g, 7.94 mmol) was dissolved in THE (40 mL), treated with DBU (8.7 mL, 63 mmol), and heated to reflux.
After 16 h the reaction mixture was cooled, filtered, concentrated in vacuo, and purified by column chromatography eluting with 80:20 then 75:25 hexane:ethyl acetate to afford 2-[(3-fluorophenyl)ethynyl]-6-methylpyrazine (427 mg, 25% yield). This material was carried on to the salt formation without further purification.
30 2-[(3-Fluorophenyl)ethynyl]-6-methylpyrazine (520 mg, 2.45 mmol) was dissolved in CH2C12 (3 mL), and the resulting solution was treated with HCl in diethyl ether (2.7 mL of a 1.OM solution, 2.7 mmol). The mixture was sonicated, and the solvent decanted. The remaining solid was dried under high vacuum to afford 2-[(3-fluorophenyl)ethynyl]-6-methylpyrazine hydrochloride (338 mg, 60%
yield) as a light yellow solid. M.p. 62-63 C. 'H NMR (CDC13, 300 MHz) S 8.73 (s, 1H), 8.57 (s, 1H), 7.54-7.35 (m, 3H), 7.28-7.20 (m, 3H), 2.84 (s, 3H).
Example 39 Synthesis of 1-Chloro-4-(1-cyclohexen-l-yl)-3-butyn-2-one Anhydrous ZnC12 (5.0 g, 37 mmol) was dissolved in THE (25 mL) and the solution cooled to 0 C in an ice bath. In another flask 1-ethynylcyclohexene (4.3 mL, 36.3 mmol) was dissolved in THE
(25 mL), cooled to 0 C in an ice bath, and treated with n-butyllithium (15.7 mL of a 2.2M solution in hexane, 34.5 mmol). After 20 minutes the cyclohexenylethynyllithium solution was added via cannula to the ZnC12 solution. After an additional 20 minutes Pd(PPh3)4 (620 mg, 0.54 mmol) was added to the alkynylzinc solution. The resulting yellow solution was treated with chloroacetyl chloride (4.2 mL, 55 mmol) dropwise over 10 minutes. After 2 h at 0 C the reaction mixture was quenched by the addition of saturated aqueous N144CI (500 mL), and diluted with ethyl acetate. The aqueous phase was extracted with ethyl acetate (3 x 200 ml) and the combined organic layers were washed with water (200 ml), brine (200 ml), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo to afford a dark brown oil that was purified by column chromatography eluting with hexane, then 99:1 hexane:ethyl acetate to afford 1-chloro-4-(1-cyclohexen-1-yl)-3-butyn-2-one (4.4 g, 67%
yield) as an orange oil. 1H
NMR (CDC13, 300 MHz) S 6.56 (m, 1H), 4.23 (s, 2H), 2.19 (m, 4H), 1.68-1.62 (m, 4H). MS (EI
ionization) 182 (35C1 M+), 184 (37C1 M). The material was carried on to the next step without further purification.
Example 40 Synthesis of 4-(1-Cyclohexen-l-vlethynyl)-2-methyl-1,3-thiazole, p-toluenesulfonic acid salt 1-Chloro-4-(1-cyclohexen-l-yl)-3-butyn-2-one (2.0 g, 11.0 mmol) was dissolved in DMF (10.0 mL), thioacetamide (950 mg, 12.6 mmol) was added, and the resulting pale brown solution was stirred at ambient temperature for 64 h. The reaction mixture was diluted with ethyl acetate (300 mL), washed with saturated NaHCO3 solution (300 mL), water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was dissolved in ethyl acetate, adsorbed onto silica gel and purified by column chromatography eluting with hexane, 99:1 then 98:2 hexane:ethyl acetate to afford 4-(1-cyclohexen-1-ylethynyl)-2-methyl-1,3-thiazole (620 mg, 28% yield) as a yellow powder.
'H NMR (CDC13i 300 MHz) 8 7.22 (s, 111), 6.27-6.24 (m, 1H), .2.7 (s, 3H) 2.22-2.12 (m, 4H), 1.68-1.58 (m, 4H).
4-(1-Cyclohexen-1-ylethynyl)-2-methyl-1,3-thiazole (620 mg, 3.1 mmol) was dissolved in ethanol (30 mL) at ambient temperature. p-Toluenesulfonic acid monohydrate (580 mg, 3.1 mmol) was added in one portion to afford a brown solution. After all of the acid had dissolved the reaction mixture was stirred for several minutes and then concentrated in vacuo to afford a dark brown oil which solidified under high vacuum. The crude material was dissolved in hot ethyl acetate. After cooling to ambient temperature the material was stored in the freezer for few hours. The supernatant solution was decanted and the crystalline solids were dried under high vacuum to afford crystalline 4-(1-cyclohexen-1-ylethynyl)-2-methyl-l,3-thiazole p-toluenesulfonate salt (882 mg , 74%
yield) as yellow crystals.
M.p. 128-129 C. 'H NMR (CD3OD, 300 MHz) S 7.87 (s, 1H), 7.71-7.68 (d, J=9 Hz, 2H), 7.24-7.21 (d, J=9Hz, 3H), 6.38 (m,.1H), 2.88, (s, 3H), 2.36 (s, 3H), 2.21-2.17 (m, 4H), 1.68-1.64 (m, 4H).
Example 41 Synthesis of 4-(1-Cvclohexen-l-vlethvnvl)-1,3-thiazol-2-ylamine, p-toluenesulfonic acid salt 1-Chloro-4-(1-cyclohexen-1-yl)-3-butyn-2-one (2.0 g, 11 mmol) was dissolved in DMF (10.0 mL), thiourea (996 mg, 13.1 mmol) was added, and the resulting pale brown solution was stirred at ambient temperature for 16 h. The reaction mixture was diluted with ethyl acetate (200 mL), washed with saturated NaHCO3 solution (100 mL), water (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The dark oil was dissolved in ethyl acetate, adsorbed onto silica gel and purified by column chromatography eluting with 9:1 then 3:1 hexane:ethyl acetate to afford 4-(1-cyclohexen-1-ylethynyl)-1,3-thiazol-2-ylamine (1.1 g, 49% yield) as an off-white solid. MS (EI
ionization) 204 (M+).
4-(1-Cyclohexen-l-ylethynyl)-1,3-thiazol-2-ylamine (1.1g, 5.4 mmol) was dissolved in ethanol (40 mL) at ambient temperature. p-Toluenesulfonic acid monohydrate (1.0 g, 5.4 mmol) was added in one portion to afford a brown solution. After all of the acid had dissolved the reaction mixture was stirred for several minutes and then concentrated in vacuo to afford a dark brown oil which solidified under high vacuum. The crude material was dissolved in hot ethyl acetate.
After cooling to ambient temperature the material was stored in the freezer. After several hours in the freezer, the supernatant solution was decanted and the crystalline solids were dried under high vacuum to afford 4-(1-cyclohexen-1-ylethynyl)-1,3-thiazol-2-ylamine p-toluenesulfonate salt (1.84 g, 87% yield) as off-white powder. M.p. 188-189 C. 'H NMR (CD3OD, 300 MHz) 6 7.72 -7.69 (d, J=9 Hz, 2H), 7.24-7.22 (d, J=6 Hz, 2H), 6.94 (s, 1H), 6.34-6.32 (m, 1H), 2.36 (s, 3H), 2.19-2.15 (m, 4H) 1.70-1.61 (m, 4H).
Example 42 Synthesis of 2-(1-Cvclohexen-l-vlethvnvl)-6-methylpyridine 2-Bromo-6-methyl pyridine (2.0 g, 12 mmol) and Cul (440 mg, 2.3 mmol) were combined in DME (30 mL), and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.0 mL, 58 mmol) and PdC12(PPh3)2 (814 mg, 1.16 mmol) were added, followed by the dropwise addition of 1-ethynylcyclohexene (1.7 g, 15 mmol).
The reaction was stirred at ambient temperature overnight. GC/MS showed no starting 2-bromo-6-methylpyridine remaining.
The mixture was diluted with ethyl acetate (100 mL), and filtered through CeliteTM. The pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with water (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography eluting with hexane then 99:1, 98:2 hexane:ethyl acetate to afford 2-(1-cyclohexen-1-ylethynyl)-6-methylpyridine (1.8 g, 79%
yield) as a red oil. 1H
NMR (CDC13, 300 MHz) S 7.51-7.46 (m, 1H), 7.21 (d, J=9 Hz, 1H), 7.03 (d, J=9 1H), 6.32-6.29 (m, 1H), 2.53 (s, 3H), 2.24-2.21 (m, 2H), 2.14-2.12 (m, 2H), 1.67-1.57 (m, 4H). MS
(ESI) 198.1 (M).
Example 43 Synthesis of 2-(Cyclohexylethvnyl)-6-methylpyridine 2-Bromo-6-methyl pyridine (2.0 g, 11.6 mmol) and CuI (440 mg, 2.3 mmol) were combined in DME (30 mL), and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.0 mL, 58 mmol) and PdC12(PPh3)2 (814 mg, 1.16 mmol) were added, followed by the dropwise addition of cyclohexylethyne (1.25 g, 11.6 mmol). The reaction was stirred at ambient temperature overnight. GC/MS showed no starting 2-bromo-6-methylpyridine remaining.
The mixture was diluted with ethyl acetate (100 mL), and filtered through CeliteTM. The pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with water (200 mL), brine (200 mL), dried over Na2S04, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography eluting with hexane then 98:2, 96:4 hexane:ethyl acetate to afford 2-(cyclohexylethynyl)-6-methylpyridine (1.78 g, 77% yield) as a pale brown liquid that partially solidified on standing in the freezer. 1H NMR (CDC13, 300 MHz) S 7.52-7.46 (m, 1H), 7.20 (d, J=9 Hz, 1H), 7.03 (d, J=9 Hz, 1H), 2.6 (m,1 H), 2.54 (s, 3H), 2.93-2.89 (m, 2H), 1.78-1.73 (m, 2H), 1.57-1.54 (m, 3H), 1.36-1.32 (m, 3H). MS (ESI) 200.1 (M++H).
Example 44 Preparation of 4-Methyl-2-1(E)-2-phenylethenyll-1,3-oxazole Cinnamamide (2.0 g, 14 mmol), chloroacetone (0.93 mL, 16 mmol), and K2C03 (940 mg, 6.8 mmol) were combined under argon and the mixture was heated in a 120 C oil bath. The reaction mixture solidified and stirring stopped upon heating. After 16 h, the cooled reaction mixture was quenched by the addition of water (20 mL) and then diluted with ethyl acetate (100 mL). The organic phase was dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography eluting with 90:10 hexane:ethyl acetate. The product that was obtained (280 mg) showed some close running impurities by thin layer chromatography (TLC).
The material was further purified by preparative TLC via multiple elutions with 95:5 hexane:ethyl acetate. Isolation of the middle of the main band afforded 4-methyl-2-[(E)-2-phenylethenyl]-1,3-oxazole (47.0 mg, 2%
yield) as a yellow oil. 'H NMR (CDC13, 300 MHz) S 7.53-7.32 (m, 7H), 6.91 (d, J=16.4 Hz, 1H), 2.21 (s, 3H). MS (ESI) 185.7 (M+H).
Example 45 4-Methyl-2-12-phenylethenyll-l,3-thiazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of Ethyl 4-methyl-1,3-thiazole-2-carboxylate: Ethyl thiooxamate (3.0 g, 22 mmol) was dissolved in ethanol (30 mL) under argon. Chloroacetone (1.8 mL, 22 mmol) was added and the resultant solution was heated at 80 C for 16 h. The reaction mixture was concentrated in vacuo, adsorbed onto silica gel, and purified by column chromatography on silica gel eluting with 97:3, then 95:5 hexane:ethyl acetate to afford ethyl 4-methyl-1,3-thiazole-2-carboxylate (850 mg, 22% yield) as an oil. 'H NMR (CDC13, 300 MHz) 7.20 (s, 1 H), 4.48 (q, J=7.1 Hz), 2.56 (s, 3H), 1.47 (s, 3H). MS
(EI ionization) 171 (M).
Preparation of (4-Methyl-1,3-thiazol-2-yl)methanol: Ethyl 4-methyl-1,3-thiazole-2-carboxylate (450 mg, 2.6 mmol) was dissolved under argon in tetrahydrofuran (THF) (5 mL). The solution was cooled to 0 C in an ice bath and treated with diisobutylaluminum hydride (5.3 mL of a 1.5M solution in toluene, 7.9 mmol). The reaction mixture was allowed to slowly warm to ambient temperature over 16 h and then cooled to -78 C and cautiously quenched by the dropwise addition of methanol. After gas evolution had ceased, saturated aqueous sodium-potassium tartrate (10 mL) was added, and the reaction mixture was allowed to warm to ambient temperature.
The aqueous phase was extracted with ethyl acetate (3 x 30 mL), the combined organics dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 90:10 then 1:1 hexane:ethyl acetate to afford (4-methyl-1,3-thiazol-2-yl)methanol (180 mg, 53%
yield) as an oil. 'H NMR (CDC13, 300 MHz) S 6.81 (s, 1H), 4.84 (s, 3H), 2.36 (s, 3H). MS (EI
ionization) 129 (M).
Preparation of 4-Methyl-1,3-thiazole-2-carbaldehyde: (4-Methyl-1,3-thiazol-2-yl)methanol (180 mg, 1.4 mmol) was dissolved in CH2Cl2 (9 mL), and treated with MagtrieveTM (2.5 g). The resultant suspension was heated to reflux for 16 h. The reaction mixture was cooled and filtered through a pad of CeliteTM. The filter pad was washed thoroughly with CH2Cl2 and the combined filtrates were concentrated in vacuo to afford 4-methyl-1,3-thiazole-2-carbaldehyde (120 mg, 67%
yield) as an oil. The material was carried on to the next step without further purification. MS (El ionization) 127 (M).
Preparation of 4-Methyl-2-[2-phenylethenyll-1,3-thiazole: Sodium hydride (102 mg of a 60% suspension in mineral oil, 4.3 mmol) was slurried in dry 1,2-dimethoxyethane (DME) under argon, cooled to 0 C in an ice bath, and diethylbenzyl phosphonate (0.89 mL, 4.3 mmol) was added dropwise to the suspension. Thirty minutes after the completion of the phosphonate addition, 4-methylthiazole-2-5 carboxaldehyde (120 mg, 0.94 mmol) was added as a solution in DME (5 mL).
After stirring for 4 h, further NaH (40 mg of a 60% suspension in mineral oil, 1.0 mmol) was added and the reaction mixture was allowed to warm to ambient temperature and stir for 16 h. The reaction mixture was quenched by the addition of water (20 mL) and ethyl acetate (50 mL). The aqueous phase was extracted with ethyl acetate (2 x 30 mL), the combined organics were dried over Na2S04, filtered, and concentrated in 10 vacuo. The crude product was purified by column chromatography on silica gel eluting with 90:10 hexane:ethyl acetate to afford 4-methyl-2-[2-phenylethenyl]-1,3-thiazole (30 mg, 16% yield) as an oil.
'H NMR analysis showed the material to be a 10:1 mixture of E and Z isomers (spectral data are reported for the major isomer). 'H NMR (CDC13, 300 MHz) S: 7.54-7.51 (m, 2H) 7.42-7.23 (m, 5H) 6.80 (s, 1H) 2.47 (s, 3H). MS (ESI) (minor isomer) 202.2 (M++H), (major isomer) 201.6 (M+).
15 Example 46 2-Methyl-4-[(E)-2-phenylethenyll-l,3-thiazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of Ethyl 2-methyl-1,3-thiazole-4-carboxylate: Thioacetamide (7.6 g, 100 20 mmol) was added to ethanol (60 mL), and the resultant suspension was cooled to 0 C and treated with ethyl bromopyruvate (12.5 mL, 100 mmol). The resultant solution was stirred for five minutes at 0 C
at which time the ice bath was removed and the solution was allowed to warm to ambient temperature.
After 0.5 h at ambient temperature, the solution was heated to reflux. After 12 h, the solvents were removed in vacuo, and the resultant crude product was taken up in ethyl acetate (300 mL). The organic 25 phase was washed with saturated aqueous NaHCO3 (50 mL), and the basic aqueous solution was then extracted with additionalethyl acetate (2 x 50 mL). The combined organic solutions were washed with brine (50 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo to afford a yellow waxy solid. The crude product was dissolved in a small amount of hot ethyl acetate, diluted with hot hexane, and the resultant solution was allowed to cool to ambient temperature, seeded with a 30 small amount of crude product, and transferred to the freezer. After 16 h the crystalline product was collected, washed with cold 8:1 hexane:ethyl acetate, and allowed to dry under high vacuum to afford ethyl 2-methyl-1,3-thiazole-4-carboxylate (11.76 g, 69% yield) as large brownish crystals. M.p. 56-58.5 C. 1H NMR (CDC13, 300 MHz) S 8.06 (s, 1H), 4.43 (q, 2H), 2.78 (s, 3H), 1.42 (t, 3H). MS (El ionization) 171 (M+).
Preparation of (2-Methyl-1,3-thiazol-4-yl)methanol: Ethyl 2-methyl-1,3-thiazole-4-carboxylate (15 g, 60 mmol) was slurried in THE (40 mL) and cooled to 0 C.
Lithium aluminum hydride (60 mL of a 1M solution in THF) was added slowly and the reaction mixture was allowed to warm to 25 C. After 16 h the reaction was quenched by the dropwise addition of water (2.28 mL), 15% NaOH solution (2.28 mL) and then water (6.84 mL). Ethyl acetate (100 mL) was added, the reaction mixture filtered, and the filtrate concentrated in vacuo. The crude residue was chromatographed on silica gel with ethyl acetate:hexane (1:1) as eluant to afford (2-methyl- 1,3 -thiazol-4-yl)methanol as an oil (4.41 g, 57%). This material was carried on to the next step without further purification.
Preparation of 2-Methyl-1,3-thiazole-4-carbaldehyde: (2-Methyl-1,3-thiazol-4-yl)methanol (4.4 g , 34 mmol) was dissolved in CH2C12 (400 mL). MagtrieveTM (44 g) was added and the reaction was heated under reflux for 24 h. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with CH2C12. The filtrate was concentrated in vacuo to afford 2-methyl-1,3-thiazole-4-carbaldehyde (3.7g, 86% yield) as a yellow oil which was carried on to the next step without further purification. 1H NMR (CDC13, 300 MHz) 6 9.98 (s, 1H), 8.06 (s, 1H,), 2.79 (s, 3H,). MS (EI
ionization) 127 (M+).
Preparation of 2-Methyl-4-[(E)-2-phenylethenyl[-1,3-thiazole: Sodium hydride (120 mg of a 60% suspension in mineral oil, 3.0 mmol) was slurried in DME (6 mL) and cooled to 0 C. Diethyl benzylphosphonate (1.1 g, 5.0 mmol) was added dropwise and after 15 minutes, 2-methyl-1,3-thiazole-4-carbaldehyde (320 mg, 2.5 mmol) in DME (5 mL) was added dropwise to the reaction mixture. After 3 h at 0 C the reaction mixture was diluted with ethyl acetate (10 mL) and washed with saturated aqueous NH4CI (10 mL), saturated aqueous NaHCO3 (10 mL), brine (10 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 90:10 hexane:ethyl acetate to afford 2-methyl-4-[(E)-2-phenylethenyl]-1,3-thiazole (330 mg, 65% yield) as an oil. 1H NMR (CDC13, 300 MHz) 6 7-7.5 (m, 8H), 2.7 (s, 3H). MS
(ESI) 202.1 (M++H).
Example 47 2-Methyl-4-(phenylethynyl)-1,3-thiazole, p-toluenesulfonic acid salt The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of 1-Chloro-4-phenyl-3-butyn-2-one: Anhydrous ZnC12 (10 g, 73 mmol) was dissolved in THE (50 mL) and the solution cooled to 0 C in an ice bath. In another flask phenylacetylene (8.0 mL, 73 mmol) was dissolved in THE (50 mL), cooled to 0 C
in an ice bath, and treated with n-butyllithium (32 mL of a 2.2M solution in hexane, 70 mmol).
After 20 minutes the phenylethynyllithium solution was added via cannula to the ZnC12 solution.
After an additional 20 minutes Pd(PPh3)4 (1.23 g, 1.06 mmol) was added to the alkynylzinc solution.
The resulting yellow solution was treated with chloroacetyl chloride (8.8 mL, 110 mmol) dropwise over 10 minutes. After 2 h at 0 C the reaction mixture was quenched by the addition of cold aqueous 1M
HCl (50 mL), and diethyl ether (500 mL). The acidic aqueous was extracted with diethyl ether (2 x 50 mL) and the combined organic extracts were washed with water (50 mL), saturated NaHCO3 (50 mL), and brine (50 mL). The dark solution was dried and decolorized over Na2SO4, and charcoal and filtered through a pad of CeliteTM. The pad was washed thoroughly with ethyl acetate and the combined filtrates were concentrated in vacuo to afford a dark brown oil. The crude product was purified by column chromatography eluting with hexane, 99:1, 98:2, 96:4, then 94:6 hexane:ethyl acetate to afford 1-chloro-4-phenyl-3-butyn-2-one (7.83 g, 60% yield) as an orange oil which darkened and partially solidified upon standing in the freezer. IH NMR (CDC13, 300 MHz) S 7.63-7.60 (m, 2H), 7.53-7.39 (m, 3H), 4.33 (s, 3H). MS (EI ionization) 178 (35C1 M+), 180 (37C1 M+).
Preparation of 2-Methyl-4-(phenylethynyl)-1,3-thiazole, p-toluenesulfonic acid salt: 1-Chloro-4-phenyl-3-butyn-2-one (1.6 g, 9.1 mmol) was dissolved in dry acetonitrile (15 mL), treated with thioacetamide (680 mg, 9.1 mmol), and heated to reflux for 4 h. After cooling, the acetonitrile was removed in vacuo, and the residue was partitioned between water (50 mL) and ethyl acetate (150 mL).
The organic phase was dried over Na2SO4, filtered, concentrated in vacuo, adsorbed onto silica gel, and purified by column chromatography on silica gel eluting with 99:1, 98:2, then 95:5 hexane:ethyl acetate to afford 2-methyl-4-(phenylethynyl)-1,3-thiazole (240 mg, 13% yield) as a red oil. 1H NMR (CDC13, 300 MHz) S 7.58-7.54 (m, 2H), 7.40-7.34 (m, 4H), 2.74 (s, 3H). MS (EI
ionization) 199 (M+).
2-Methyl-4-(phenylethynyl)-1,3-thiazole (270 mg, 1.35 mmol) was dissolved in ethanol (6 mL) at ambient temperature. p-Toluenesulfonic acid monohydrate (252 mg, 1.32 mmol) was added in one portion to afford a brown solution. After all of the acid had dissolved the reaction mixture was stirred for several minutes and then concentrated in vacuo to afford a dark brown oil which partially solidified under high vacuum. The crude material was triturated with diethyl ether, and the resulting solids were taken up in hot ethyl acetate. The hot solution was treated with decolorizing carbon and filtered hot to afford a pale brown solution, which was treated with hexane until cloudy, then heated to afford a clear solution. The solution was seeded with authentic product and allowed to crystallize. After cooling to ambient temperature the material was stored in the freezer for 16 h. The supernatant solution was decanted and the crystalline solids were pumped down under high vacuum to afford crystalline 2-methyl-4-(phenylethynyl)-1,3-thiazole, p-toluenesulfonic acid salt (260 mg, 52% yield) as brown crystals. M.p. 131-132.5 C. 1H NMR (CD3OD, 300 MHz) S 7.99 (s, 1H), 7.70 (d, J=8.lHz), 7.60-7.57 (m, 2H), 7.46-7.43 (m, 3H), 7.23 (d, J=8 Hz, 2H), 2.89, (s, 3H), 2.36 (s, 3H).
MS (ESI) 199.7 (M++H).
Example 48 Preparation of 4-(Phenylethynyl)-1,3-thiazol-2-amine.
p-toluenesulfonic acid salt 1-Chloro-4-phenyl-3-butyn-2-one (245 mg, 1.37 mmol) was dissolved in DMF (1.0 mL), thiourea (126 mg, 1.66 mmol) was added, and the resulting pale brown solution was stirred at ambient temperature for 5 days. The reaction mixture was diluted with Ethyl acetate (50 mL), washed with saturated NaHCO3 solution (10 mL), water (10 mL), brine (10 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The dark oil was dissolved in methanol, adsorbed onto silica gel and purified by column chromatography eluting with 4:1, 3:1, then 2:1 hexane:ethyl acetate to afford 4-(phenylethynyl)-1,3-thiazol-2-amine (56 mg, 20% yield) as an oil. IH NMR
(CDC13, 300 MHz) S
7.53-7.50 (m, 2H), 7.37-7.32 (m, 3H), 6.77 (s, 1H), 5.41 (br s, 2H). MS (EI
ionization) 200 (M+).
4-(Phenylethynyl)-1,3-thiazol-2-amine (700 mg, 3.5 mmol) was dissolved in ethanol (20 mL) at ambient temperature. p-Toluenesulfonic acid monohydrate (660 mg, 3.5 mmol) was added in one portion to afford a brown solution. After all of the acid had dissolved the reaction mixture was stirred for several minutes and then concentrated in vacuo to afford a dark brown oil which solidified under high vacuum. The crude material was dissolved in hot ethyl acetate containing a few drops of methanol. After cooling to ambient temperature the material was stored in the freezer for few hours.
The supernatant solution was decanted and the crystalline solids were dried under high vacuum to afford crystalline 4-(phenylethynyl)-1,3-thiazol-2-amine, p-toluenesulfonic acid salt (1.0 g , 73% yield) as brown crystals. M.p. 131-132.5 C. 1H NMR (CD3OD, 300 MHz) S 7.73 -7.70 (d, J=9 Hz, 2H), 7.56-7.52 (dd, J=9,2 Hz, 2H), 7.48-7.37 (m, 3H), 7.23-7.20 (d, J 9Hz, 2H), 7.12, (s, 1H), 2.34 (s, 3H).
Example 49 4-Methyl-5-(phenylethynyl)-1,3-thiazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of 5-Bromo-4-methyl-1,3-thiazole: N-Bromosuccinimide (30 g, 170 mmol) was suspended in CC14 (150 mL) and 4-methylthiazole (15 g, 150 mmol) was added in one portion. The mixture was heated under reflux for 4 h then allowed to cool to ambient temperature. The reaction mixture was diluted with ethyl acetate (500 mL) and washed with water, then brine. The organics were dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with 9:1 hexane:methylene chloride to afford 5-bromo-4-methyl-1,3-thiazole (6.8g, 24% yield) as a dark reddish oil. 1H NMR (CDC13, 300 MHz) S 8.69 (s, 1H), 2.44 (s, 3H). MS
(EI ionization) 177 (35C1 M+), 179 (37C1 M+).
Preparation of 4-Methyl-5-(phenylethynyl)-1,3-thiazole: 5-Bromo-4-methyl-1,3-thiazole (570mg, 3.2 mmol) and Cul (120 mg , 0.63 mmol ) were combined in DME (5 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture.
Triethylamine (2.0 mL, 14 mmol) and PdC12(PPh3)2 (220 mg, 0.32 mmol) were added, followed by the dropwise addition of phenylacetylene (1.0 mL, 9.5 mmol ). After 16 h stirring at ambient temperature additional phenylacetylene (0.35 mL, 3.2 mmol), Cu!, (61 mg, 0.32 mmol), and PdC12(PPh3)2 (110 mg, 0.16 mmol) were added and the reaction mixture was stirred for a further 16 h. The reaction was then heated to reflux, and after 3 h the reaction mixture was cooled, diluted with ethyl acetate (20 mL), and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate and the combined filtrates were washed with water (20 mL), brine (20 mL), dried over Na2SO4, filtered and concentrated in vacuo.
The residue was purified by column chromatography on silica gel eluting with 95:5 hexane:ethyl acetate to afford 4-methyl-5-(phenylethynyl)-1,3-thiazole (166 mg, 26% yield) as a red oil. 1H NMR
(CDC13, 300 MHz) S 8.62 (s, 1H), 7.54-7.50 (m, 2H), 7.37-7.26 (m, 3H), 2.6 (s, 3H). MS (ESI) 200.1 (M++H).
Example 50 5-[(2-Fluorophenyl)ethynyll-4-methyl-1,3-thiazole 5-Bromo-4-methyl-1,3-thiazole (500 mg, 2.8 mmol) and Cul (120 mg, 0.63 mmol) were combined in DME (5 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (2.0 mL, 14 mmol) and PdC12(PPh3)2 (220 mg, 0.32 mmol) were added, followed by the dropwise addition of (2-fluorophenyl)acetylene (1.0 g, 8.3 mmol) . The reaction mixture was heated and after 3 h at reflux, allowed to cool, diluted with ethyl acetate (20 mL), and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate and the combined filtrates were washed with water (20 mL), brine (20 mL), dried over Na2SO4, and filtered.
The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with 95:5 hexane:ethyl acetate to afford 5-[(2-fluorophenyl)ethynyl]-4-methyl-1,3-thiazole (690 mg, 56% yield) as a red oil. IH NMR (CDC13, 300 MHz) 6 8.65 (s, 1H), 7.53-7.47 (m, IH), 7.36-7.26 (m, 1H), 7.17-7.09 (m, 2H), 2.62 (s, 3H). MS (ESI) 217.3 (M+).
Example 51 2-(Phenylethynyl)-1,3-thiazole, p-toluenesulfonic acid salt 2-Bromo-1,3-thiazole (2.0 g, 12 mmol) and Cu! (460 mg, 2.4 mmol) were combined in DME
(40 mL), and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.6 mL, 62 mmol) and PdC12(PPh3)2 (856 mg, 1.22 mmol) were added and then phenylacetylene (3.7g, 36.5 mmol) was added dropwise. The reaction was heated to reflux at which point the reaction mixture solidified. Additional DME (20 mL) was added to dissolve the solids and the reaction mixture was allowed to stir for 16 h at reflux, at which time GC/MS showed no remaining 2-bromothiazole. After cooling, the mixture was diluted with 200 mL
ethyl acetate, and filtered through CeliteTM. The pad was then washed thoroughly with ethyl acetate and the combined filtrates were washed with water (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography eluting with 5 hexane, then 97:3 hexane:ethyl acetate) to afford 2-(phenylethynyl)-1,3-thiazole (1.3 g, 60% yield) as a yellowish oil. 1H NMR (CDC13, 300 MHz) 8 7.86 (d, J=3.2 Hz, 1H), 7.61-7.57 (m, 2H), 7.42-7.26 (m, 4H). MS (ESI) 185.2 (M+).
2-(Phenylethynyl)-1,3-thiazole (3.00 g, 16.2 mmol) was dissolved in ethanol (75 mL) at ambient temperature. p-Toluenesulfonic acid monohydrate (3.08 g, 16.2 mmol) was added in one 10 portion to afford a yellow solution. After all of the acid had dissolved the reaction mixture was stirred for several minutes and then concentrated in vacuo to afford a bright yellow solid. An attempt was made to recrystallize the material from hot ethyl acetate:hexane, but the recovery of solid after cooling was poor. Analysis of the crude material from the reaction showed it to be of sufficient purity. 2-(Phenylethynyl)- 1,3-thiazole, p-toluenesulfonic acid salt (4.77 g, 82% yield) was obtained as a bright 15 yellow powder that turns beige upon standing at ambient temperature. M.p.
130-132 C. 1H NMR
(CD3OD, 300 MHz) 6 8.17 (d, J=3.7 Hz, 1H), 8.05 (d, J=3.7 Hz, 1H), 7.72-7.67 (m, 4 H), 7.56-7.46 (m, 3 H), 7.22 (d, J=8 Hz, 2 H), 2.35 (s, 3 H). MS (ESI) 186.1 (M++H).
Example 52 4-Bromo-2-(phenylethynyl)-1,3-thiazole 20 2,4-Dibromo-l,3-thiazole (2.0 g, 8.2 mmol) and CuI (312 mg, 1.64 mmol) were combined in DME (25 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (5.7 mL, 41 mmol) and PdC12(PPh3)2 (580 mg, 0.82 mmol) were added, and then phenylacetylene (0.90 mL, 8.6 mmol) was added dropwise. The reaction was stirred for 4 h at ambient temperature at which point GC/MS analysis showed the reaction to be complete . The mixture 25 was filtered through CeliteTM, the filter pad was washed thoroughly with Ethyl acetate and the combined filtrates were then concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with water (200 mL), brine (200 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, then 97:3 hexane:ethyl acetate to afford pure 4-bromo-2-(phenylethynyl)-1,3-thiazole (1.0 g, 46% yield) as a 30 colorless solid. M.p. 79-82 C; 1H NMR (CDC13, 300 MHz) 8 7.60-7.56 (m, 2H) 7.45-7.26 (m, 3H), 7.26 (s, 1H). MS (EI ionization) 263 (M+, 79Br), 265 (M+, 81Br).
Example 53 5-Methyl-2-(phenylethynyl)-1,3-thiazole 4-Bromo-2-(phenylethynyl)-1,3-thiazole (500 mg, 1.89 mmol) was dissolved in dry THE (10 mL) under argon, cooled to -78 C, then t-butyllithium (1.7 mL of a 1.7M
solution in pentane, 2.8 mmol) was added. After 30 min 0.4 mL of the reaction mixture was quenched with saturated NH4C1 and extracted with ethyl acetate. GC/MS of the crude product from this workup and comparison with a GC/MS of authentic 2-(2-phenylethynyl)-thiazole showed the two to be identical. This confirmed that the initial coupling with phenylacetylene (in Example 9) took place at the bromine at the 2 position rather than at the 4 position. The GC/MS also showed that the reaction was not complete. Additional t-butyllithium (1.7 mL of a 1.7M solution in pentane, 2.8 mmol) was added. After 30 minutes iodomethane (0.36 mL, 5.7 mmol) was added to the reaction mixture, and the reaction was allowed to warm to ambient temperature for 16 h. The solvents were then removed in vacuo, and residue dissolved in ethyl acetate (50 mL), washed with water (50 mL), brine (50 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography eluting with hexane, 99:1, 98:2, 97.5:2.5 hexane:ethyl acetate to afford 2-(2-phenylethynyl)-5-methyl-1,3-thiazole (90 mg). 1H NMR analysis of the material showed it to be impure, despite its apparent homogeneity by TLC analysis. The crude compound was dissolved in DMSO and purified by preparative HPLC with a 30 min gradient from 70:30 water:acetonitrile to 100%
acetonitrile to afford pure 5-methyl-2-(phenylethynyl)-1,3-thiazole as a white powder (44 mg, 24%
yield). M.p. 82-83 C. 1H
NMR (CDC13, 300 MHz) S 7.85-7.55 (m, 2H), 7.49 (d, J=0.6 Hz, 1H), 7.37-7.32 (m, 3H), 2.49 (s, 3H).
MS (ESI) 200.1 (M++H).
Example 54 2-1(3-Methylphenyl)ethynyll-1,3-thiazole 2-Bromo-1,3-thiazole (2.0 g, 13 mmol) and Cul (330 mg, 1.7 mmol) were combined in DME
(25 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (5.7 mL, 43 mmol) and PdC12(PPh3)2 (604 mg, 0.86 mmol) were added and m-tolylacetylene (1.0 g, 8.6 mmol) was added dropwise. The reaction mixture was heated under reflux for 4 h at which time GC/MS showed the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with water (200 mL), brine (200 mL), dried over Na2SO4, filtered and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane then 98:2 hexane:ethyl acetate to afford 2-[2-(3-methylphenyl)ethynyl]-thiazole (280 mg, 16% yield) as a yellow oil which was still impure by I H
NMR analysis. The compound (280 mg) was dissolved in DMSO and purified by preparative HPLC
with a 30 min gradient from 70:30 water:acetonitrile to 100% acetonitrile to afford pure 2-[(3-methylphenyl)ethynyl]-1,3-thiazole (122 mg, 6% yield) as a yellow oil. 1H NMR
(CDC13, 300 MHz) S
7.84 (d, J=3.0 Hz, 111), 7.40-7.34 (m, 3H), 7.28-7.18 (m, 2H), 2.34 (s, 3H).
MS (ESI) 200.1 (M++H).
Example 55 2-1(4-Fluorophenyl)ethynyll-l,3-thiazole 2-Bromo-1,3-thiazole (1.0 g, 6.2 mmol) and Cu! (152.4 mg, 0.8 mmol) were combined in DME
(17 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (3 mL, 21 mmol) and PdC12(PPh3)2 (280 mg, 0.40 mmol) were added and 1-ethynyl-4-fluorobenzene (500 mg, 4.2 mmol) was added dropwise. The reaction was heated under reflux for 4 h at which time GC/MS showed the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with Ethyl acetate.
The combined filtrates were then concentrated in vacuo. The residue was dissolved in ethyl acetate (100 mL), washed with water (100 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 98:2 hexane:ethyl acetate to 2-[(4-fluorophenyl)ethynyl]-1,3-thiazole as a white solid which was impure by 'H NMR
analysis. The compound (280 mg) was dissolved in DMSO and purified by preparative HPLC with a 30 min gradient from 60:40 water:acetonitrile to 100% acetonitrile to afford 2-[(4-fluorophenyl)ethynyl]-1,3-thiazole (33 mg, 3% yield) as a white solid. M.p. 78-79 C. 'H NMR (CDC13, 300 MHz) S
7.83 (d, J=3.0 Hz, 11-1), 7.60-7.55(m, 2H), 7.39 (d, J=3.0 Hz, 1H), 7.14-7.00 (m, 2H). MS (ESI) 204 (M+H).
Example 56 2-1(2-Fluorophenvl)ethvnvll-1,3-thiazole 2-Bromo-1,3-thiazole (2.0 g, 13 mmol) and Cu! (316 mg, 1.6 mmol) were combined in DME
(25 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (5.8 mL, 42 mmol) and PdC12(PPh3)2 (580 mg, 0.83 mmol) were added and 1-ethynyl-2-fluorobenzene (1.0 g, 8.3 mmol) was added dropwise. The reaction was heated under reflux for 4 h at which time GC/MS showed the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL) and washed with water (200 mL), brine (200 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 98:2 hexane:ethyl acetate to afford 2-[(2-fluorophenyl)ethynyl]-1,3-thiazole (700 mg, 41% yield) as a yellow oil that was impure by 'H NMR
analysis. The compound (140 mg) was dissolved in DMSO and purified by preparative HPLC with a 30 min gradient from 50:50 water:acetonitrile to 100% acetonitrile to afford 2-[(2-fluorophenyl)ethynyl]-1,3-thiazole (53.2 mg, 75% yield) as a yellow oil. 'H
NMR (CDC13, 300 MHz) S
7.88 (d, J=3.0 Hz, 1H), 7.59-7.53 (m, 1H), 7.42-7.35 (m, 2H), 7.18-7.09 (m, 2H). MS (ESI) 204 (M++H).
Example 57 4,5-Dimethyl-2-(phenylethynvl)-1,3-thiazole.
The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of 2-Bromo-4,5-dimethyl-1,3-thiazole: 4,5-Dimethyl-1,3-thiazole (5.0 g, 44 mmol) was dissolved in carbon tetrachloride (60 mL), and N-bromosuccinimide (8.19 g, 46 mmol) was added. The resulting mixture was heated to reflux while protected from light with aluminum foil. After 'Y2 h at reflux the dark suspension was cooled and allowed to stand at ambient temperature for 16 h. The reaction mixture was then heated to reflux for an additional 4 h and cooled to ambient temperature.
After standing at ambient temperature for 16 h, GC/MS analysis showed mostly monobromide, with a small amount of starting 4,5-dimethyl-1,3-thiazole present. The yellow supernatant solution was decanted from the black solids that had deposited on the walls of the flask.
The crude product was concentrated in vacuo, and then further purified by column chromatography eluting with hexane, 99:1, 98:2, 96:4, 94:6, then 90:10 hexane:ethyl acetate to afford 2-bromo-4,5-dimethyl-1,3-thiazole (1.34 g, 16 % yield) as a white semi-solid. M.p. 55-60 C. 'H NMR (CDC13, 300 MHz) S
2.31 (s, 3H), 2.30 (s, 3H). MS (El ionization) 191 (M+, 79Br), 193 (M+, 81Br).
Preparation 4,5-Dimethyl-2-(phenylethynyl)-1,3-thiazole: 2-Bromo-4,5-dimethyl-1,3-thiazole (1.3 g, 6.8 mmol) and CuI (190 mg, 1.36 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (5.0 mL, 34 mmol) and PdC12(PPh3)2 (477 mg, 0.68 mmol) were added and phenylacetylene (1.86 g, 18.9 mmol) was added dropwise. After stirring at ambient temperature for 16 h, GC/MS showed the reaction was complete. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (100 mL), washed with water (100 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 95:5 hexane:ethyl acetate to afford 4,5-dimethyl-2-(phenylethynyl)-1,3-thiazole (338 mg 24% yield) as a white solid. M.p. 55-60 C. 1H NMR (CDC13, 300 MHz) S 7.56-7.53 (m, 2H), 7.35-7.33 (m, 3H), 2.38 (s, 6H). MS (ESI) 214.0 (M++H).
Example 58 5-Methyl-3-[(E)-2-phenylethenyl]-1,2,4-oxadiazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of (2E)-N-Hydroxy-3-phenyl-2-propenimidamide: To a solution of hydroxylamine hydrochloride (690 mg, 10 mmol) in ethanol was added NaOH (400 mg, 10 mmol), followed by cinnamonitrile (1.3 g, 10 mmol). This mixture was heated to reflux for 16 h. The ethanol was removed in vacuo, the residue was acidified with 3M HCl (5 mL) and the solution was boiled for 30 minutes. The cooled solution was made basic (pH 8) with NH4OH, and partitioned between water and ethyl acetate. The organics were concentrated to give a sticky white mass which was used without further purification.
Preparation of 5-Methyl-3-[(E)-2-phenylethenyl]-1,2,4-oxadiazole: (2E)-N-Hydroxy-3-phenyl-2-propenimidamide (1.6 g, 10 mmol) was mixed with excess acetyl chloride (30 mL), and heated to reflux. After 1 h the solution was cooled and the excess acetyl chloride was removed in vacuo. The resultant solids were triturated in hot ethyl acetate-hexane-acetone solution, and the supernatant was removed. The remaining solids were dried under high vacuum to afford 5-methyl-3-[(E)-2-phenylethenyl]-1,2,4-oxadiazole (0.50 g, 27% yield from cinnamonitrile) as a pale yellow powder. M.p. 166-168 C. 'H NMR (DMSO-d6, 300 MHz) 5 7.59 (m, 3H), 7.42 (m, 3H), 6.58 (d, J=16 Hz, 1H), 2.17 (s, 3H).
Example 59 5-[(E)T2- henylethenvll-1 2 4-oxadiazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of N-[(Dimethylamino)methylene]-cinnamamide: Cinnamamide (4.4 g, mmol) and N,N-dimethylformamide dimethylacetal (9.9 mL, 75 mmol) were heated at reflux for 2 h.
Excess formamide and methanol formed in the reaction were removed in vacuo.
The solids which formed were collected and washed with hexane, followed by two portions of ethyl acetate, then dried under vacuum at 40 C to afford N-[(dimethylamino)methylene]-cinnamamide (3.5 g, 58% yield) as a white crystalline solid. M.p. 91-93 C. 'H NMR (DMSO-d6, 300 MHz) S 8.58 (s, 1H), 7.83 (d, J=16 Hz, 1H), 7.57 (m, 2H), 7.36 (m, 3H), 6.74 (d, J=16 Hz, 1H), 3.18 (m, 6H).
Preparation of N-[(Hydroxyamino)methylene]-cinnamamide:
N-[(Dimethylamino)methylene]-cinnamamide (1.0 g, 5.0 mmol) was added to a solution of hydroxylamine hydrochloride (415 mg, 6.0 mmol) in acetic acid (5 mL of 70%
aqueous) and aqueous NaOH (1.2 mL, 5 M, 6.0 mmol). After stirring for 1.5 h water (5 mL) was added , and the reaction mixture was cooled to 5 C in an ice bath. The solution was partitioned between ethyl acetate and water, and the organics were dried over Na2SO4, then concentrated in vacuo to afford N-[(hydroxyamino)methylene]-cinnamamide (850 mg, 90%). This material was carried on to the next step without further purification.
Preparation of 5-[(E)-2-phenylethenyl]-1,2,4-oxadiazole: N-[(Hydroxyamino)methylene]-cinnamamide (850 mg, 4.5 mmol) was dissolved in acetic acid/dioxane (20 mL 1:1 v:v), and heated to reflux for 2 h. The cooled solution was made basic (pH 8) with K2C03, and partitioned between ethyl acetate and water. The organics were dried over Na2SO4, and concentrated in vacuo. The resultant 5 solids were triturated with hot ethyl acetate, and the soluble portion was purified by flash column chromatography on silica eluting with 2:1 hexane:ethyl acetate to afford 5-[(E)-2-phenylethenyl]-1,2,4-oxadiazole (60 mg, 8% yield) as a white powder. M.p. 53-55 C. 1H NMR (CDC13, 300 MHz) S 8.43 (s, 1H), 7.85 (d, J=16 Hz, 1H), 7.60 (m, 2H), 7.45 (m, 3H), 7.05 (d, J=16 Hz, 1H). MS (EI ionization) 171 (M+-H).
10 Example 60 Preparation of 1-Methyl-5-[(E)-2-phenylethenyl]-1H-1,2.4-triazole N-[(Dimethylamino)methylene]-cinnamamide (2.0 g, 10 mmol) was added to a mixture of acetic acid (20 mL) and methylhydrazine (0.6 mL, 11 mmol). The mixture was heated to 90 C for 2 h.
The cooled mixture was concentrated in vacuo, and made basic (pH 9) with solid K2CO3. The aqueous 15 residue was partitioned between ethyl acetate and water, the organics were dried over Na2SO4i and concentrated in vacuo. The resultant powder was recrystallized from a minimum of boiling Ethyl acetate. The collected solids were triturated and washed with ethyl acetate to afford 1-methyl-5-[(E)-2-phenylethenyl]-1H-1,2,4-triazole (0.9 g, 49 % yield) as a pale yellow powder.
M.p. 67-70 C from Ethyl acetate. 'H NMR (CDC13, 300 MHz) 8 7.88 (s, 1H), 7.73 (d, J=16 Hz, 1H), 7.57 (m, 2H), 7.39 20 (m, 3H), 6.92 (d, J=16Hz, 1H), 3.96 (s, 3H).
Example 61 3-Methyl-5- [(E)-2-phenylethenyl]-1 H-1 2,4-triazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
25 Preparation of N-[(Dimethylamino)ethylidene]-cinnamamide: Cinnamamide (1.8 g, 12 mmol) and N,N-dimethylacetamide dimethylacetal (2.8 mL, 19 mmol) were heated to 120 C for 2 h.
Excess amide and methanol formed in the reaction were removed in vacuo. The resultant material was purified by flash column chromatography on silica eluting with ethyl acetate to afford N-[(dimethylamino)ethylidene]-cinnamamide (2.1 g, 78 % yield) as a pale yellow solid containing one 30 equivalent of ethyl acetate. 'H NMR (DMSO-d6, 300 MHz) S 7.61 (d, J=16 Hz, 1H), 7.53 (m, 2H), 7.36 (m, 3H), 6.68 (d, J=16 Hz, 1H), 3.13 (app d, J=15 Hz, 6H), 2.30 (s, 3H).
Preparation of 3-Methyl-5-[(E)-2-phenylethenyl]-1H-1,2,4-triazole:
N-[(Dimethylamino)ethylidene]-cinnamamide (2.0 g, 9.0 mmol) was added to a solution of hydrazine hydrate (0.59 mL, 10 mmol) and acetic acid (25 mL). The mixture was heated to 90 C for 3 h, cooled, and concentrated in vacuo. The resulting material was basified (pH 8) with solid K2CO3, and partitioned between ethyl acetate and water. The organics were dried over Na2SQ4, and concentrated in vacuo. The resultant material was purified by flash column chromatography on silica eluting with 1:2 hexane-ethyl acetate to afford 3-methyl-5-[(E)-2-phenylethenyl]-111-1,2,4-triazole (1.6 g, 96% yield) as a white powder. M.p. 131-134 C. 'H NMR (CDC13, 300 MHz) 8 7.68 (d, J=16 Hz, 0.3H), 7.59 (d, J=16 Hz, 0.711), 7.49 (m, 211), 7.32 (m, 3H), 7.05 (d, J=16 Hz, 111), 6.49 (d, J=16 Hz, 0.4H), 6.21 (br s, 0.3H), 5.88 (br s, 0.3H), 2.53 (s, 311). MS (El ionization) 184 (M+-H).
Example 62 Ethyl 3-1(E)-2-phenylethenyll-1,2,4-thiadiazole-5-carboxylat The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of 5-[(E)-2-Phenylethenyl]-1,3,4-oxathiazol-2-one: Cinnamamide (1.9 g, 13 mmol) was mixed with chlorocarbonylsulphenylchloride (1.0 mL, 13 mmol) in chloroform and heated to reflux for 18 h. The reaction mixture was concentrated in vacuo and the resultant material was taken up in boiling hexane (100 mL). The solvent was decanted from the remaining solid, the volume of this solution was reduced by half, and the solution was allowed to cool. The crystalline solids which formed were collected and washed with hexane to afford 5-[(E)-2-phenylethenyl]-1,3,4-oxathiazol-2-one (1.93 g, 72% yield) as pale yellow needles. M.p. 105-106 C 'H NMR (DMSO-d6, 300 MHz) 6 7.52 (m, 3H), 7.46 (s, 0.5H), 7.41 (m, 2.5H), 6.63 (d, J=16 Hz, 1H).
Preparation of Ethyl 3-[(E)-2-phenylethenyl]-1,2,4-thiadiazole-5-carboxylate:
5-[(E)-2-Phenylethenyl]-1,3,4-oxathiazol-2-one (1.4 g, 7.0 mmol) was mixed with ethyl cyanoformate (2.4 g, 25 mmol) in xylenes, and heated to reflux for 3 h. The reaction mixture was concentrated in vacuo, and the resulting material was recrystallized from ethyl acetate-ethanol (1:1) to give ethyl 3-[(E)-2-phenylethenyl]-1,2,4-thiadiazole-5-carboxylate (1.2 g, 66% yield) as a light yellow solid. M.p. 79-80 C. 'H NMR (CDC13, 300 MHz) 8 7.98 (d, J=16 Hz, 1H), 7.61 (m, 2H), 7.40 (m, 3H), 7.29 (d, J=11 Hz, 1H), 4.56 (q, J=7 Hz, 2H), 1.50 (t, J=7 Hz, 3H). MS (EI ionization) 259 (M+-H).
Example 63 {3-[(E)-2-phenylethenyl]-1,2,4-thiadiazol-5-yllmethanol Ethyl3-[(E)-2-phenylethenyl]-1,2,4-thiadiazole-5-carboxylate (1.0 g, 3.8 mmol) was suspended in methanol (50 mL), and NaBH4 (220 mg, 5.8 mmol) was added in portions. The mixture was stirred for 16 h at ambient temperature. The reaction was concentrated in vacuo, acidified with aqueous HCl (4 M) to pH 2, and partitioned between Ethyl acetate and water. The organics were dried over Na2SO4i concentrated in vacuo, and the resultant material was rerystallized from ethyl acetate to afford {3-[(E)-2-phenylethenyl]-1,2,4-thiadiazol-5-yl}methanol (0.6 g, 71% yield) as a pale yellow solid. M.p. 119-120 C.'H NMR (CDC13i 300 MHz) 8 7.79 (d, J=16 Hz, 1H), 7.57 (m, 2H), 7.38 (m, 3H), 7.23 (d, J=16 Hz, 1H), 5.14 (d, J=5 Hz, 2H), 3.29 (t, J=5 Hz, 1H). MS (EI ionization) 217 (M+-H).
Example 64 2-(1-Cyclohexen-l-ylethvnvl)-5-methylthiophene 2-Iodo-5-methylthiophene (1.0 g, 4.5 mmol) was mixed with PdC12 (44 mg, 0.25 mmol), PPh3 (200 mg, 0.75 mmol), Cul (140 mg, 0.75 mmol) and K2C03 (1.66 g, 12 mmol) in a solution of DME
and water (1:1). Argon gas was bubbled through the suspension for twenty minutes to deoxygenate the mixture. 1-Ethynyl-l-cyclohexene (1.06 g, 10.0 mmol) was added and the mixture was heated to reflux. After 16 hours the reaction was cooled and filtered through CeliteTM.
The resultant solution was partitioned between water and ethyl acetate. The organic layer was dried over anhydrous Na2SO4, and concentrated in vacuo. The resulting product was purified by flash column chromatography on silica gel eluting with hexane to afford 2-(1-cyclohexen-1-ylethynyl)-5-methylthiophene (0.96 g, 86% yield) as a light yellow oil. 'H NMR (CDC13, 300 MHz) 6 6.94 (d, J= 3.5 Hz, 1H), 6.60 (m, 1H), 6.18 (m, 1H), 2.45 (s, 3H), 2.13 (m, 4H), 1.68-1.57 (m, 4H). MS (EI ionization) 202 (M+).
Example 65 Synthesis of 2-(1H-inden-2-ylethynyl)pyridine 2-Indanone (1.0g, 7.6 mmol) was dissolved in THE (60 mL) and cooled to -78 C
in an argon blanketed flask. Potassium hexamethyl disilazide (9.1 mmol, 18.2 mL of a 0.5M
solution in toluene) was added dropwise to this stirred solution. After 30 min, N-phenyl trifluoromethanesulfonimide (4.05 g, 11.4 mmol) was added as a solution in THE (15 mL). The reaction was stirred for 15 min at -78 C, then brought to ambient temperature and stirred for an additional 1 h, after which time it was quenched with H2O (15 mL) and diluted with ethyl acetate (500 mL). The ethyl acetate solution was washed with H2O (3 x 100 mL) and brine (100 mL), then dried (MgSO4), filtered, and concentrated in vacuo. The residue was chromatographed on silica gel, eluting with 30:1 hexanes:ethyl acetate to afford 2-[(trifluoromethyl)sulfonyl]-1H-indene (1.28 g, 64% yield) as a brown oil. The enol triflate (500 mg, 1.89 mmol) and 2-ethynyl pyridine (579 mg, 5.62 mmol) were dissolved in DME
(10 mL) and deoxygenated via argon bubbling for 20 min and then added via syringe to a deoxygenated DME (25 mL) solution of triphenylphosphine (100 mg, 0.38 mmol), bis-triphenylphosphine palladium dichloride (133 mg, 0.19 mmol), Cul (72 mg, 0.38 mmol), and triethylamine (954 mg, 1.32 mL, 9.45 mmol). The reaction was capped with a reflux condenser and stirred at 80 C for 1.5 h, after which time it was cooled to ambient temperature and poured in to a separatory funnel containing ethyl acetate (300 mL), where it was washed with H2O (2 x 100 mL) and brine (100 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 6:1 hexanes:ethyl acetate to afford 2-(1H-inden-2-ylethynyl)pyridine (309 mg, 75% yield) as the free base, which was then solubilized in diethyl ether (25 mL) and precipitated as the hydrochloride salt (M.p. 170-172 C) upon treatment with 1M HCI in diethyl ether (5 mL). 'H NMR
(CD3OD, 300 MHz) b 8.98 (d, J=5.7 Hz, 1H), 8.76 (t, J=8.0 Hz, 1H), 8.33 (d, J=8.0 Hz, 1H), 8.17 (t, J=6.3 Hz, I H), 7.82 (s, I H), 7.72 (m, 2H), 7.53 (m, 2H), 3.96 (s, 2H). MS
(ESI) 218.1 (M++H).
Example 66 Synthesis of 2-(3,4-dihydro-2-naphthalenylethynyl)pyridine 2,6-Lutidine (547 mg, 594 L, 5.1 mmol) was added neat, via syringe to a stirred, argon blanketed solution of [3-tetralone (500 mg, 3.4 mmol) in methylene chloride (30 mL) at ambient temperature. After 5 min, trifluoromethanesulfonic anhydride (1.439 g, 858 L, 5.1 mmol) was added slowly via syringe. After 1.5 h, the reaction was quenched with saturated aqueous NaHCO3 (5 mL) and partitioned between ethyl acetate (200 mL) and H2O (50 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The residue was then chromatographed on silica gel, eluting with 20:1 hexanes:ethyl acetate to afford 3-[(trifluoromethyl)sulfonyl]-1,2-dihydronaphthalene (361 mg, 38% yield) as a brown oil. Following the procedure described for Example 65, the (3-tetralone enol triflate (275 mg, 1.0 mmol) was cross-coupled with 2-ethynylpyridine (337 mg, 3.27 mmol) in a reaction over 16 h at 70 C. Upon completion, the reaction was concentrated in vacuo, and the residue was chromatographed on silica gel, eluting with 7:1 hexanes:ethyl acetate to afford 2-(3,4-dihydro-2-naphthalenylethynyl)pyridine (193 mg, 84% yield) as an off white semi-solid.
'H NMR (CDC13, 300 MHz) S 8.62 (d, J=4.5 Hz, I H), 7.67 (ddd, J=7.7 Hz, 7.7 Hz, 1.8 Hz, 1H), 7.48 (d, J=7.9 Hz, I H), 7.07-7.28 (m, 5H), 7.00 (s, 1H), 2.91 (t, J=7.8 Hz, 2H), 2.59 (t, J=8.4 Hz, 2H). MS
(ESI) 232.1 (M++H).
Example 67 Synthesis of 1-(2-pyridinylethynyl)-1-indanol n-Butyllithium (18.93 mmol, 11.8 mL of 1.6M solution in hexanes) was added dropwise to a stirred solution of 2-ethynylpyridine (1.95 g, 18.93 mmol) in THE (80 mL) at -78 C. After 15 min, solid anhydrous CeC13 (4.66 g, 18.93 mmol) was added and the reaction was stirred for an additional 1 h, at which time a solution of 1-indanone (1.00 g, 7.57 mmol) in THE (10 mL) was added via syringe.
The reaction was then warmed to ambient temperature, stirred for 1 h, and quenched with 5 mL H20.
The reaction was then diluted with ethyl acetate (250 mL) and extracted with H2O (3 x 75 mL). The combined aqueous portions were back-extracted with ethyl acetate (100 mL). The ethyl acetate layers were combined, dried over MgSO4, filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1:1 hexanes:ethyl acetate to afford 1-(2-pyridinylethynyl)-1-indanol (1.1 g, 62% yield) as a thick amber liquid. 'H NMR (CDCl3, 300 MHz) S 8.42 (d, J=4.9 Hz, I H), 7.63 (d, J=6.6 Hz, I H), 7.54 (ddd, J=7.7 Hz, 7.7 Hz, 1.7 Hz, I H), 7.33 (d, J=7.8 Hz, 1H), 7.10-7.25 (m, 4H), 5.50 (s, 1H), 3.12 (m, 1H), 2.91 (m, 1H), 2.68 (m, 1H), 2.53 (m, 1H). MS (ESI) 236.1 (M++H).
Example 68 Synthesis of 1-fluoro-2-(2-pyridinylethynyl)-2-indanol Potassium hexamethyldisilazide (19.9 mmol, 39.8 mL of 0.5M solution in toluene) was added slowly to a stirred solution of 2-indanone (2.20 g, 16.6 mmol) in THE (60 mL) at -78 C. After 15 min, trimethylsilyl chloride (2.64 mL, 20.8 mmol) was added to generate the 1H-inden-2-yl trimethylsilyl ether. The reaction was stirred for 10 min at -78 C, then brought to ambient temperature and stirred for an additional 30 min, after which time the solvents were removed in vacuo and replaced with anhydrous acetonitrile (80 mL). Solid Selectfluor~ (8.82 g, 24.9 mmol) reagent was then added and the resulting slurry was stirred for 16 h at ambient temperature. The reaction was then diluted with ethyl acetate (400 mL) and extracted with H2O (3 x 100 mL). The ethyl acetate layer was dried (MgS04), filtered, and concentrated in vacuo. The residue was chromatographed on silica gel, eluting with 4:1 hexanes:ethyl acetate to afford the 1-fluoro-2-indanone (1.05 g, 42% yield) product as a sticky brown solid. Following the procedure outlined for Example 67, the intermediate 1-fluoro-2-indanone (1.05 g, 7.0 mmol) was cross-coupled with 2-ethynyl pyridine (1.44 g, 14.0 mmol) to afford 1-fluoro-2-(2-pyridinylethynyl)-2-indanol (320 mg, 18% yield, 8% overall yield) as a tan semi-solid. 1H NMR
(CDC13, 300 MHz) S 8.57 (d, J=4.8 Hz, 1H), 7.64 (ddd, J=7.8 Hz, 7.8 Hz, 1.8 Hz, 1H), 7.49 (d, J=7.3 Hz, 1H), 7.22-7.43 (m, 5H), 5.98 (d, J['H-19F] = 56.0 Hz, 1H), 4.29 (s, 1H), 3.51 (s, 2H). MS (ESI) 254.1 (M++H).
Example 69 Synthesis of 2-1(3-fluoro-1H-inden-2-yl)ethynyllpyridine n-Butyllithium (2.39 mmol, 1.5 mL of 1.6M solution in hexanes) was added slowly to a stirred solution of 1-fluoro-2-(2-pyridinylethynyl)-2-indanol (550 mg, 2.17 mmol) and LiBr (188 mg, 2.17 mmol) in THE (15 mL) at -78 C. After 30 min, methanesulfonyl chloride (274 mg, 185 L, 2.39 mmol) was added and the reaction was stirred for an additional 1.5 h at ambient temperature before quenching with H2O (5 mL). The reaction flask contents were then transferred to a separatory funnel containing ethyl acetate (100 mL) that was subsequently washed with H2O (2 x 50 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was then dissolved in methylene chloride (25 mL), treated with DBU (1.982 g, 1.947 mL, 13.02 mmol), and warmed to reflux. After 16 h, the reaction mixture was cooled to ambient temperature, diluted with methylene chloride (100 ml) and washed with H2O (2 x 50 mL). The methylene chloride layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 5:1 hexanes:ethyl acetate to afford 2-[(3-fluoro-1H-inden-2-yl)ethynyl]pyridine (75 mg, 15% yield) as a yellow oil which was then solubilized in ether (15 mL) and precipitated as the hydrochloride salt (M.p. 150-152 C) upon treatment with 1M HCl in diethyl ether (2 mL). 'H NMR
(CD3OD, 300 MHz) 8 8.81 (d, J=5.3 Hz, 1H), 8.59 (ddd, J=8.0 Hz, 8.0 Hz, 1.4 Hz, 1H), 8.16 (d, J=8.
Hz, 1H), 8.00 (dd, J=6.4 Hz, 6.4 Hz, 1H), 7.45-7.58 (m, 4H), 3.76 (d, J[1H-19F] = 6.6 Hz). MS (ESI) 236.1 (M++H).
Example 70 Synthesis of 2-1(tert-butoxycarbonyl)aminolbenzoic acid 5 Anthranilic acid (1.37 g, 10.0 mmol) and di-tert-butyl dicarbonate (3.12 g, 14.3 mmol) were added to a stirred mixture of 0.5M NaOH (20.0 mL), dioxane (10.0 mL), and CH3CN (2.0 mL) at 0 C.
The cold bath was removed, and the reaction mixture was stirred at ambient temperature for 16 h before quenching with 10% aqueous citric acid (30 mL). The mixture was diluted with H2O (100 mL) in a separatory funnel and extracted with methylene chloride (3 x 100 mL). The combined methylene 10 chloride extracts were dried (MgSO4), filtered, and concentrated in vacuo to obtain 2-[(tert-butoxycarbonyl)amino]benzoic acid (2.33 g, 98% yield) as a white solid that was suitably pure to carry on to the next synthetic step.
Example 71 Synthesis of tert-butyl 2-f lmethoxy(methyl)aminolcarbonyl}phenylcarbamate 15 To a stirred solution of the N-BOC-anthranilic acid from Example 70 (2.33 g, 9.8 mmol) in methylene chloride (100 mL) was added EDC (2.82 g, 14.7 mmol), hydroxybenzotriazole dihydrate (1.459 g, 10.8 mmol), diisopropyl ethylamine (6.0 mL, 34.3 mmol), and N,O-dimethylhydroxylamine hydrochloride (1.43 g, 14.7 mmol). The reaction was stirred for 16 h, after which time it was concentrated in vacuo and diluted with ethyl acetate (500 mL). The ethyl acetate solution was washed 20 with 1M HCl (100 mL), saturated NaHCO3 (100 mL), brine (100 mL), and H2O (2 x 100 mL), then dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 4:1 hexanes:ethyl acetate to afford tert-butyl 2-{[methoxy(methyl)amino]carbonyl}phenylcarbamate (2.00 g, 73% yield) as a pale yellow solid.
Example 72 25 Synthesis of tert-butyl 2-formylphenvlcarbamate LiAlH4 (6.67 mmol, 6.67 mL of a 1.OM solution in THF) was added to an Ar-purged, stirred solution of the tert-butyl 2-{[methoxy(methyl)amino]carbonyl}phenylcarbamate from Example 71 (1.87 g, 6.67 mmol) in THE (50 mL) at -78 C. Stirring was continued at -78 C
for 15 min, after which time the reaction was brought to ambient temperature and stirred for an additional 1 h. The reaction 30 was then cooled to 0 C and treated with IN aqueous HCl (25 mL) to quench.
The mixture was poured in to a separatory funnel containing H2O (250 mL) and extracted with methylene chloride (3 x 100 mL).
The combined methylene chloride layers were dried (MgSO4), filtered, and concentrated in vacuo to afford tert-butyl 2-formylphenylcarbamate (1.48 g, 100% yield) as a tan solid.
Example 73 Synthesis of tert-butyl 2-fl-hydroxy-3-(2-pyridinyl)-2-propynyllphenylcarbamate n-Butyllithium (14.0 mmol, 8.75 mL of 1.6M solution in hexanes) was added dropwise to a stirred solution of 2-ethynylpyridine (1.44 g, 14.0 mmol) in THE (80 mL) at -78 C. After 15 min, solid anhydrous CeC13 (3.45 g, 14.0 mmol) was added and the reaction was stirred for an additional 1 h, after which time a solution of the tert-butyl 2-formylphenylcarbamate from Example 72 (1.48 g, 6.7 mmol) in THE (20 mL) was added via syringe. The reaction was warmed to ambient temperature, stirred for 1 h, quenched with H2O (5 mL), then diluted with ethyl acetate (250 mL) and extracted with H2O (3 x 75 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo, resulting in a crude residue that was chromatographed on silica gel, eluting with 2:1 hexanes:ethyl acetate to afford the racemic 2 alkanol (1.71 g, 79% yield) as a light peach colored amorphous solid.
Example 74 Synthesis of 4-(2-pyridinylethynyl)-1,4-dihydro-2H-3,1-benzoxazin-2-one The tert-butyl 2-formylphenylcarbamate from Example 73 (250 mg, 0.77 mmol) was deprotected without incident by dissolving the compound in dioxane (10 mL), treating it with 4M HCl in dioxane (30 mL, 120 mmol HCQ), and stirring for 2.5 h, resulting in precipitation from solution of the 1-(2-aminophenyl)-3-(2-pyridinyl)-2-propyn-l-ol as the hydrochloride salt. The dioxane solvent was decanted, the precipitate was triturated with diethyl ether (3 x 20 mL) and dried in vacuo to obtain the crude deprotected material as a pale pink solid. The deprotection was assumed to be quantitative, and the crude material was therefore carried on to the next step, dissolving it in a solution of diisopropylethylamine (500 mg, 674 L, 3.87 mmol) in methylene chloride (20 mL). The reaction flask was cooled to 0 C, and phosgene (1.935 mmol, 1.02 mL of a 1.89M solution in toluene) was added dropwise to the stirred solution. Stirring at 0 C was continued for 2.5 h, followed by an H2O (5 mL) quench. The biphasic mixture was diluted with ethyl acetate (100 mL) and washed with H2O (2 x 50 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 2:1 hexanes:ethyl acetate to obtain 4-(2-pyridinylethynyl)- 1,4-dihydro-2H-3,1-benzoxazin-2-one (140 mg, 73% yield) as a tan, semi-solid glass.
'H NMR (CDC13, 300 MHz) S 9.13 (s, 1H), 8.61 (d, J=4.4 Hz, 1H), 7.69 (ddd, J=7.8 Hz, 7.8 Hz, 1.8 Hz, I H), 7.51 (d, J=7.8 Hz, 1H), 7.41 (d, J=7.6 Hz, 1H), 7.27-7.34 (m, 2H), 7.11 (ddd, J=7.6 Hz, 7.6 Hz, 0.8 Hz, 1H), 6.93 (d, J=7.8 Hz, 1H), 6.34 (s, 1H). MS (ESI) 251.1 (M++H).
Example 75 Synthesis of ethyl 3-(2-pyridinylethynyl)-8-azabicyclol3.2.1loct-2-ene-8-carboxylate N-Carbethoxy-4-tropinone (500 mg, 2.54 mmol) was dissolved in THE (25 mL) and cooled to -78 C in an argon blanketed flask. Potassium hexamethyldisilazide (3.05 mmol, 6.1 mL of a 0.5M
solution in toluene) was added dropwise to this stirred solution. After 15 min, N-phenyl trifluoromethanesulfonimide (1.36 g, 3.81 mmol) was added as a solution in THE
(10 mL). The reaction was stirred for 15 min at -78 C, then brought to ambient temperature and stirred for an additional 1 h, after which time it was quenched with H2O (10 mL) and diluted with ethyl acetate (200 mL). The ethyl acetate solution was washed with H2O (3 x 50 mL), dried (MgSO4), filtered, and concentrated in vacuo. The residue was chromatographed on silica gel, eluting with a gradient from 5%
to 50% ethyl acetate in hexanes to afford the ethyl 3-[(trifluoromethyl)sulfonyl]-8-azabicyclo[3.2.1]oct-2-ene-8-carboxylate (820 mg, 98% yield) as a tan liquid. The ethyl 3-[(trifluoromethyl)sulfonyl]-8-azabicyclo[3.2.1]oct-2-ene-8-carboxylate (820 mg, 2.50 mmol) and 2-ethynylpyridine (516 mg, 5.00 mmol) were dissolved in DME (15 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated DME (25 mL) solution of triphenylphosphine (131 mg, 0.50 mmol), bis-triphenylphosphine palladium dichloride (176 mg, 0.25 mmol), CuI (95 mg, 0.50 mmol), and triethylamine (1.265 g, 1.74 mL, 12.50 mmol). The reaction was warmed to 50 C and stirred for 1.5 h, after which time it was cooled to ambient temperature and poured into a separatory funnel containing ethyl acetate (350 mL), where it was washed with H2O (2 x 100 mL) and brine (100 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1:1 hexanes:ethyl acetate to afford ethyl 3-(2-pyridinylethynyl)-8-azabicyclo[3.2.1]oct-2-ene-8-carboxylate (400 mg, 57%
yield) as a free base. The toluenesulfonate salt was then prepared by adding solid toluenesulfonic acid to a solution of ethyl 3-(2-pyridinylethynyl)-8-azabicyclo[3.2.1]oct-2-ene-8-carboxylate (200 mg, 0.69 mmol) in ethanol (10 mL).
The mixture was stirred for 5 min until all solids were dissolved, after which time the solution was concentrated in vacuo. The resulting red oil was triturated with ether (3 x 10 mL) and placed under high vacuum, where it foamed to a dark red semi-solid. 1H NMR (CD3OD, 300 MHz) S 8.86 (d, J=5.3 Hz, 1H), 8.64 (ddd, J=8.0 Hz, 8.0 Hz, 1.5 Hz, I H), 8.16 (d, J=8.1 Hz, I H), 8.07 (dd, J=6.3 Hz, 114), 7.80 (d, J=8.2 Hz, 2H), 7.31 (d, J=8.0 Hz, 2H), 6.96 (d, J=5.3 Hz, 1H), 4.64 (m, br., 1H), 4.52 (m, br., 1H), 4.24 (q, J=7.0 Hz, 2H), 2.92-3.08 (m, br., 1H), 2.45 (s, 3H), 2.07-2.41 (m, 4H), 1.86 (m, br., 1H), 1.36 (t, J=7.0, 3H). MS (ESI) 283.2 (M++H).
Example 76 Synthesis of 1-chloro-4-(trimethylsilyl)-3-butyn-2-one Aluminum trichloride (21.9 g, 164 mmol) was suspended in CH2C12 (250 mL) and cooled in an ice bath. Bis(trimethylsilyl)acetylene (20.0 g, 117 mmol) and chloroacetyl chloride (10.3 mL, 129 mmol) were combined in CH2CI2 (150 mL) and the solution was added to the A1C13 suspension dropwise from an addition funnel over 1 h. The dark brownish-red solution was stirred at 0 C for 1 h, then the ice bath was removed. After 1 h at ambient temperature, the reaction was cooled to 0 C and quenched by slow addition of 1M HCI.(250 mL). The acidic solution was extracted with CH2CI2 (2 x 500 mL), the combined organic layers were washed with H2O (500 mL), NaHCO3 (500 mL), brine (500 mL) and dried over Na2SO4. The organic layer was treated with silica gel, and filtered to afford a clear solution which was concentrated in vacuo. The residue was distilled under high vacuum through a vigreaux column. The main part of the distillate was collected at a head temperature of 58 C (the lower thermometer was 68 C) to afford 1-chloro-4-(trimethylsilyl)-3-butyn-2-one (11.25 g, 54% yield) as a light yellow oil.' H NMR (CDC13, 300 MHz) S 4.24 (s, 2H), 0.28 (d, 9H).
Example 77 Synthesis of 2-methyl-4-1(trimethylsilyl)ethynyll-1,3-thiazole The 1-chloro-4-(trimethylsilyl)-3-butyn-2-one from Example 76 (10 g, 57.2 mmol) was dissolved in DMF (100 mL), then thioacetamide (5.6 g, 74 mmol) was added in one portion. The mixture was allowed to stir for 16 h at' ambient temperature, at which time TLC showed no remaining 1-chloro-4-(trimethylsilyl)-3-butyn-2-one. The mixture was diluted with ethyl acetate (400 mL), and washed with H2O (3 x 300 mL), brine (300 mL), dried over Na2SO4, and filtered.
The filtrate was concentrated in vacuo, and the residue was purified by column chromatography eluting with hexane, 98:2, then 96.5:3.5 hexane:ethyl acetate to afford 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole (8.0 g, 72% yield) as reddish-brown oil. 'H NMR (CDC13, 300 MHz) b 7.32 (s, 1H), 2.70 (s, 3H), 0.26 (s, 9H). MS (EI ionization)195 (M).
Example 78 Synthesis of 4-f(trimethylsilyl)ethynyll-1,3-thiazol-2-vlamine The 1-chloro-4-(trimethylsilyl)-3-butyn-2-one from Example 76 (4.25 g, 24.3 mmol) was dissolved in DMF (20 mL), then thiourea (2.45 g, 32.2 mmol) was added in one portion. The mixture was allowed to stir for 16 h at ambient temperature, at which time TLC showed no remaining I-chloro-4-(trimethylsilyl)-3-butyn-2-one. The mixture was diluted with ethyl acetate (200 mL), and washed with H2O (3 x 200 mL), brine (200 mL), dried over Na2SO4i and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography eluting with hexane, 9:1, then 4:1 hexane:ethyl acetate to afford 4-[(trimethylsilyl)ethynyl]-1,3-thiazol-2-ylamine (4.1 g, 86% yield) as a yellow solid. ' H NMR (CDC13, 300 MHz) S 6.70 (s, 1H), 5.47 (br s, 2H), 0.20 (s, 9H). MS (EI
ionization) 196 (M+).
Example 79 Synthesis of 4-1(2-methyl-l,3-thiazol-4-yl)ethynyllisoguinoline 4-Bromoisoquinoline (276 mg, 1.33 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (200 mg, 1.02 mmol) were dissolved in DMF (5 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated, 40 C DMF
(15 mL) solution of triphenylphosphine (71 mg, 0.27 mmol), bis-triphenylphosphine palladium dichloride (93 mg, 0.13 mmol), Cul (51 mg, 0.27 mmol), tetrabutylammonium iodide (377 mg, 1.02 mmol), and triethylamine (515 mg, 710 L, 5.1 mmol). The reaction mixture was warmed to 60 C, and tetrabutylammonium fluoride (1.33 mmol, 1.33 mL of a 1.0 M solution in THF) was added slowly over 1.5 h. The reaction was then cooled to ambient temperature and poured into a separatory funnel containing 1:1 hexanes:ethyl acetate (200 mL) where it was washed with 50%
dilute brine (3 x 75 mL), dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1.5:1 hexanes:ethyl acetate to afford 4-[(2-methyl-1,3-thiazol-4-yl)ethynyl]isoquinoline (195 mg, 76% yield) as an off-white solid that was then solubilized in ether (15 mL) and precipitated as the white hydrochloride salt (M.p. 209-210 C) upon treatment with IM HCl in diethyl ether (5 mL). 'H NMR (CD3OD, 300 MHz) S 9.85 (s, 1H), 8.93 (s, 1H), 8.73 (d, J=8.4 Hz, 1H), 8.64 (d, J=8.4 Hz, I H), 8.42 (ddd, J=7.2 Hz, 7.2 Hz, 1.1 Hz, I H), 8.17 (dd, J=7.1 Hz, 7.1 Hz, I H), 8.16 (s, 1H), 2.85 (s, 3H). MS (ESI) 251.1 (M++H).
Example 80 Synthesis of 4-(4-isoquinolinylethynyl)-1,3-thiazol-2-amine Following the procedure and mole equivalents indicated for Example 79, 4-bromoisoquinoline (691 mg, 3.32 mmol) and 4-[(trimethylsilyl)ethynyl]-1,3-thiazol-2-amine from Example 78 (500 mg, 2.55 mmol) were cross-coupled to obtain 4-(4-isoquinolinylethynyl)-1,3-thiazol-2-amine (262 mg, 41%
yield) as a tannish-orange solid after eluting with 2:1 hexanes:ethyl acetate from a silica gel column.
This material was then solubilized in ether (15 mL) and precipitated as the yellow hydrochloride salt (M.p. >150 C, dec.) upon treatment with 1M HCl in diethyl ether (5 mL). 1H NMR
(CD3OD, 300 MHz) S 9.85 (s, I H), 8.96 (s, I H), 8.69 (d, J=8.4 Hz, I H), 8.62 (d, J=8.3 Hz, I H), 8.40 (ddd, J=7.1 Hz, 7.1 Hz, 1.2 Hz, 1H), 8.16 (dd, J=8.1 Hz, 8.1 Hz, 1H), 7.58 (s, 1H). MS (ESI) 252.0 (M++H).
Example 81 Synthesis of 2-1(trimethylsilyl)ethynyllpyrimidine PdC12 (166 mg, 0.93 mmol), Cu! (481 mg, 2.52 mmol), and triethylamine (18 mL, 129 mmol) were combined in DME (50 mL) under argon. Argon gas was bubbled through the resulting dark suspension while it was warmed to 70 C in an oil bath. Triphenylphosphine (978 mg, 3.73 mmol) was added and the argon flow was continued for 10 min. The argon flow was discontinued, the heating bath was removed, and 2-bromopyrimidine (5.14 g, 32.3 mmol), and trimethylsilylacetylene (9.1 mL, 64 mmol), were added as a solution in DME (30 mL) followed by a rinse of the flask and syringe with DME (10 mL). Solids appeared in the flask after the addition was completed.
The reaction mixture was then heated to 45 C. After 1 h the heating was discontinued and the reaction mixture was allowed to cool to ambient temperature. After 16 h at ambient temperature TLC analysis showed no starting 2-bromopyrimidine present. The reaction mixture was concentrated in vacuo, diluted with diethylether (300 mL), and filtered. The filtrate was washed with saturated aqueous NaHCO3 (100 mL), H2O (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo to afford a dark oil which partially solidified when pumped down under high vacuum. The crude product was purified by column chromatography eluting with hexane, 9:1, 8:1, 6:1, 4:1, then 3:1 hexane:ethyl acetate to afford 2-[(trimethylsilyl)ethynyl]pyrimidine (5.2 g, 91 % yield) as a yellow solid. 'H
NMR (CDCl3, 300 MHz) S 8.72 (d, J=4.9 Hz, 2H), 7.25 (m, IH), 0.30 (s, 9H). MS (EI ionization) 176 (M+).
Example 82 5 Synthesis of 4-(2-pyrimidinylethynyl)isoguinoline 4-Bromoisoquinoline (499 mg, 2.40 mmol) and 2-[(trimethylsilyl)ethynyl]pyrimidine from Example 81 (352 mg, 2.00 mmol) were dissolved in DMF (10 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (84 mg, 0.32 mmol), bis-triphenylphosphine palladium dichloride (112 mg, 0.16 10 mmol), Cu! (61 mg, 0.32 mmol), tetrabutylammonium iodide (369 mg, 1.00 mmol), and triethylamine (1.01 g, 1.39 mL, 10.00 mmol) in DMF (20 mL) at 40 C. The reaction was warmed to 50 C, and tetrabutylammonium fluoride (2.10 mmol, 2.10 mL of a I.OM solution in THF) was added slowly over 1.5 h. The reaction was then cooled to ambient temperature and poured in to a separatory funnel containing 1:1 hexanes:ethyl acetate (200 mL) where it was washed with 50%
dilute brine (3 x 75 mL), 15 dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1.5:1 hexanes:ethyl acetate to afford 4-(2-pyrimidinylethynyl)isoquinoline (210 mg, 45% yield) as an off-white solid that was then solubilized in diethyl ether (15 mL) and precipitated as the tan hydrochloride salt (M.p. 158-159 C) upon treatment with of 1M HCI in diethyl ether (3 mL).
'H NMR (CD3OD, 300 MHz) S 9.95 (s, 1H), 9.06 (s, 1H), 8.99 (d, J=5.0 Hz, 2H), 8.75 (d, J=8.4 Hz, 20 1 H), 8.67 (d, J=8.3 Hz, 1 H), 8.42 (ddd, J=7.2 Hz, 7.2 Hz, 1.1 Hz, 1 H), 8.17 (dd, J=7.3 Hz, 7.3 Hz, 1 H), 7.67 (dd, J=5.0 Hz, 5.0 Hz, 1H). MS (ESI) 232.0 (M++H).
Example 83 Synthesis of 2-F(6,7-dimethoxy-3,4-dihydro-2-naphthalenyl)ethynyllpyridine Using the procedure described in Example 66 but using 6,7-dimethoxy-l-tetralone in place of 25 [3-tetralone, 6,7-dimethoxy-3,4-dihydro-l-naphthalenyl trifluoromethanesulfonate was prepared in 90%
yield. 6,7-Dimethoxy-3,4-dihydro-l-naphthalenyl trifluoromethanesulfonate (1.48 g) was cross-coupled with 2-ethynylpyridine without incident following the procedure described for Example 66.
The crude reaction material was chromatographed on silica gel, eluting the product with 2:1 hexanes:ethyl acetate to obtain 2-(6,7-dimethoxy-3,4-dihydro-l-naphthalenylethynyl)pyridine (265 mg, 30 40% overall yield, 2 steps) as a pale yellow solid that was then solubilized in diethyl ether (15 mL) and precipitated as the yellow-orange hydrochloride salt upon treatment with of 1M
HCl in diethyl ether (5 mL). M.p. 148-150 C; 'H NMR (CD3OD, 300 MHz) 6 8.76 (d, J=5.7 Hz, 1H), 8.52 (ddd, J=7.9 Hz, 7.9 Hz, 1.5 Hz, I H), 8.14 (d, J=8.0 Hz, 1H), 7.94 (dd, J=6.3 Hz, 6.3 Hz, 1H), 7.11 (s, I H), 6.80 (t, J=5.0 Hz, 1H), 6.79 (s, IH), 3.83 (s, 3H), 3.80 (s, 3H), 2.74 (t, J=8.2 Hz, 2H), 2.43 (m, 2H). MS (ESI) 292.1 35 (M+H).
Example 84 Synthesis of methyl 5-f(2-methyl-1,3-thiazol-4-yl)ethynyllnicotinate Concentrated sulfuric acid (18 mL) was added to a stirred solution of 5-bromonicotinic acid (10.1 g, 50.0 mmol) in methanol (300 mL). The reaction was warmed to reflux and stirred for 18 h, then cooled to ambient temperature and quenched with saturated NaHCO3i adjusting the pH to -9. The methanol was removed in vacuo, and the remaining aqueous mixture was further diluted with H2O (250 mL) and extracted with ethyl acetate (3 x 100 mL). The ethyl acetate layers were combined, dried (MgSO4), filtered, and concentrated in vacuo to obtain methyl 5-bromonicotinate (10.09 g, 93% yield) as a white crystalline solid (M.p. = 98-99 C) without further purification.
This material (3.02 g, 14.0 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (2.48 g, 12.7 mmol) were dissolved together in DMF (20 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated, 40 C DMF (60 mL) solution of triphenylphosphine (534 mg, 2.04 mmol), bis-triphenylphosphine palladium dichloride (713 mg, 1.02 mmol), Cul (388 mg, 2.04 mmol), tetrabutylammonium iodide (1.88 g, 5.08 mmol), and triethylamine (6.414 g, 8.8 mL, 63.5 mmol). The reaction was warmed to 50 C, and tetrabutylammonium fluoride (14.0 mmol, 14.0 mL of a 1.OM solution in THF) was added via syringe pump over 1.5 h. The reaction was then cooled to ambient temperature and poured into a separatory funnel containing 1:1 hexanes:ethyl acetate (400 mL) where it was washed with 50% dilute brine (3 x 100 mL). The aqueous portion was back-extracted with 1:1 hexanes:ethyl acetate (100 mL). The organic layers were then combined, dried (MgSO4), filtered, and concentrated in vacuo, and the crude residue was chromato-graphed on silica gel, eluting with 3:1 hexanes:ethyl acetate to afford methyl 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]nicotinate (2.56 g, 78% yield) as an off-white solid. M.p. = 124-125 C. 'H NMR (CDC13, 300 MHz) S 9.15 (s, 1H), 8.93 (s, 1H), 8.40 (dd, J= 2.0 Hz, 2.0 Hz, IH), 7.49 (s, 1H), 3.98 (s, 3H), 2.76 (s, 3H). MS (ESI) 259.0 (M++H).
Example 85 Synthesis of N-hydroxyethanimidamide hydrochloride Hydroxylamine hydrochloride (13.8 g, 200 mmol) was dissolved in a IM solution of NaOH in ethanol (200 mL). To this was added acetonitrile (8.2 g, 10.43 mL, 200 mmol) neat, via syringe. The reaction was stirred at reflux for 17 h, then cooled to ambient temperature at which time 12M HCl was added (35.4 mL, 425 mmol). The mixture was concentrated in vacuo to afford a white solid to which was added boiling ethanol (200 ml). The insoluble material was then filtered, and the filtrate was collected and concentrated in vacuo to obtain N-hydroxyethanimidamide hydrochloride (19.45 g, 88%
yield) as a white crystalline solid.
Example 86 Synthesis of 3-(3-methyl-1,2,4-oxadiazol-5-yl)-5-1(2-methyl-1,3-thiazol-4-vl)ethynyllpyridine NaH (23.4 mmol, 936 mg of a 60% suspension in mineral oil) was added to a suspension of N-hydroxyethanimidamide hydrochloride from Example 85 (1.27 g, 11.5 mmol) in THE
(50 mL). The mixture was warmed to 50 C and stirred for 30 min, after which time methyl 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]nicotinate from Example 84 (1.00g, 3.9 mmol) was added as a solution in THE (20 mL).
After 45 min, the reaction was quenched with H2O (15 mL), and partitioned between ethyl acetate (250 mL) and H2O (100 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was filtered through a short plug of silica gel, eluting with 2.5% methanol in methylene chloride, then recrystallized from 1:1 hexanes:ethyl acetate to obtain 3-(3-methyl-1,2,4-oxadiazol-5-yl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (596 mg, 54%
yield) as white crystalline leaves, M.p. 153-154 C. 'H NMR (CDC13, 300 MHz) S 9.27 (d, J=2.0 Hz, 1H), 8.95 (d, J=2.0 Hz, 1H), 8.52 (dd, J=2.0 Hz, 2.0 Hz, 1H), 7.50 (s, 1H), 2.77 (s, 3H), 2.51 (s, 3H). MS
(ESI) 283.0 (M++H).
Example 87 Synthesis of 1-(methylsulfonyl)-3-F(2-methyl-13-thiazol-4-yl)ethynyll-1H-indole To a vigorously stirred solution of indole (1.0 g, 8.6 mmol) in DMF (40 mL) at ambient temperature was added KOH pellets (1.8 g, 32.1 mmol) followed by iodine (4.34 g, 17.1 mmol). After 15 min, the reaction was poured in to a separatory funnel containing saturated aqueous sodium thiosulfate (200 mL), which was then extracted with 1:1 hexanes:ethyl acetate (3 x 100 mL). The combined organic layers were first back-extracted with 1:1 H20:brine (3 x 75 mL), then dried (MgSO4), filtered, and concentrated in vacuo. The crude 3-iodo-1H-indole product was dissolved in benzene (15 mL) and to this solution was added tetrabutylammonium iodide (332 mg, 0.9 mmol), H2O (10 mL), and 50% v/v aqueous NaOH (10 mL). This biphasic mixture was stirred vigorously at ambient temperature while a solution of methanesulfonyl chloride (1.47 g, 993 L, 12.8 mmol) in benzene (15 mL) was added dropwise via syringe. After this addition, the reaction was stirred for 1 h, then partitioned with ethyl acetate (200 mL) and H2O (100 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo leaving a crude residue that was eluted through a short plug of silica with 4:1 hexanes:ethyl acetate. The resulting brown solid (2.26 g) was recrystallized from methanol to provide 3-iodo-l-(methylsulfonyl)-1H-indole (1.44 g, 43% yield, 2 steps) as tan-colored needles. Following the procedure and mole equivalents indicated above for Example 79 the 3-iodo-l-(methylsulfonyl)-lH-indole (350 mg, 1.09 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (150 mg, 0.77 mmol) were cross-coupled to obtain 1-(methylsulfonyl)-3-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-1H-indole (55 mg, 23% yield) as a tan solid after eluting with 4:1 hexanes:ethyl acetate from a silica gel column. This material was then solubilized in ether (10 mL) and precipitated as the off-white hydrochloride salt (M.p. 152-154 C) upon treatment with of 1M HCl in diethyl ether (2 mL).
'H NMR (CD3OD, 300 MHz) 8 8.02 (s, 1H), 7.96 (s, 1H), 7.95 (dd, J=7.5 Hz, 1.1 Hz, 1H), 7.81 (dd, J=7.1 Hz, 1.2 Hz, 111), 7.49 (ddd, J=7.8 Hz, 7.8 Hz, 1.2 Hz, 111), 7.43 (ddd, J=7.5 Hz, 7.5 Hz, 1.1 Hz, 1H), 3.36 (s, 3H), 2.91 (s, 3H). MS (ESI) 317.0 (M++H).
Example 88 Synthesis of 2-chloro-5-1(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine 2-Chloro-5-iodo-pyridine (3.0g, 12.53 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (2.57 g, 13.16 mmol) were dissolved in DMF (15 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (394 mg, 1.50 mmol), bis-triphenylphosphine palladium dichloride (528 mg, 0.75 mmol), Cul (286 mg, 1.50 mmol), tetrabutylammonium iodide (927 mg, 2.51 mmol), and triethylamine (6.33 g, 8.7 mL, 62.7 mmol) in DMF (60 mL) at 40 C. The reaction was warmed to 50 C, and tetrabutylammonium fluoride (13.8 mmol, 13.8 mL of a 1.OM solution in THF) was added via syringe pump over 1.5 h. The reaction was then cooled to ambient temperature and poured into a separatory funnel containing 1:1 hexanes:ethyl acetate (200 mL) where it was washed with 50% dilute brine (3 x 75 mL), dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 0.5% to 1.0% methanol in methylene chloride to afford 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (2.29 g, 78% yield) as an off-white solid, M.p. 138-139 C. 'H
NMR (CDC13, 300 MHz) S 8.56 (d, J=2.1 Hz, 1H), 7.78 (dd, J=8.3 Hz, 2.3 Hz, 1H), 7.45 (s, 1H), 7.33 (d, J=8.2 Hz, 1H), 2.75 (s, 3H). MS (ESI) 234.9 (M++H).
Example 89 Synthesis of 5-1(2-methyl-1,3-thiazol-4-yl)ethynyll-2-phenylpyridine Phenylboronic acid (569 mg, 4.26 mmol) and 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 88 (1.00 g, 4.26 mmol) were dissolved in DME
(10 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (112 mg, 0.43 mmol), bis-triphenylphosphine palladium dichloride (150 mg, 0.21 mmol), and potassium carbonate (1.18 g, 8.52 mmol) in DME (15 mL) and H2O (25 mL) at 40 C. The reaction was stirred at reflux for 3 h, then cooled to ambient temperature and poured into a separatory funnel containing ethyl acetate (250 mL). The ethyl acetate layer was washed with saturated NaHCO3 (50 mL), and H2O (2 x 50 mL), then dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 4:1 hexanes:ethyl acetate to afford 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-2-phenylpyridine (1.00 g, 85%
yield) as a pale yellow solid, M.p. 102-103 C. 'H NMR (CDC13, 300 MHz) S 8.86 (d, J=2.1, 1H), 8.00 (m, 2H), 7.89 (dd, J=8.3 Hz, 2.2 Hz, 1H), 7.73 (d, J=8.3 Hz, 1H), 7.45 (s, 1H), 7.43-7.52 (m, 3H), 2.76 (s, 3H). MS (ESI) 277.0 (M++H).
Example 90 Synthesis of 2-(4-chlorophenyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyllpyridine Following the procedure and mole equivalents indicated above for Example 89, 4-chloro phenylboronic acid (74 mg, 0.47 mmol) and 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 88 (100 mg, 0.43 mmol) were cross-coupled to obtain 2-(4-chlorophenyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (105 mg, 79% yield) as a white solid after eluting with 3:1 hexanes:ethyl acetate from a silica gel column. This material was solubilized in ethanol (10 mL) and acidified with 1M HCl in diethyl ether (4 mL). The pale yellow hydrochloride salt (M.p. 193-194 C) was then obtained upon concentration of this solution in vacuo and trituration with diethyl ether (3 x 10 mL). 'H NMR (CD3OD, 300 MHz) S 8.86 (s, 1H), 7.98 (d, J=8.5 Hz, 2H), 7.95 (d, J=8.6 Hz, 1H), 7.73 (d, J=8.2 Hz, 1H), 7.47 (s, 1H), 7.47 (d, J=8.4 Hz, 2H), 2.76 (s, 3H). MS
(ESI) 311.0 (M++H).
Example 91 Synthesis of 2-(4-methoxyphenyl)-5-F(2-methyl-1,3-thiazol-4-yl)ethynyllpvridine Following the procedure and mole equivalents indicated above for Example 89, 4-methoxy phenylboronic acid (106 mg, 0.70 mmol) and 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 88 (150 mg, 0.64 mmol) were cross-coupled to obtain 2-(4-methoxyphenyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (156 mg, 80% yield) as a white solid, M.p. 125-126 C, after eluting with 2:1 hexanes:ethyl acetate from a silica gel column. 'H NMR
(CDCl3, 300 MHz) S 8.81 (d, J=1.6 Hz, 1H), 7.96 (d, J=8.8 Hz, 2H), 7.82 (dd, J=8.3 Hz, 2.2 Hz, 1H), 7.63 (d, J=8.2 Hz, 1H), 7.42 (s, 1H), 6.98 (d, J=8.8 Hz), 3.84 (s, 3H), 2.73 (s, 3H). MS (ESI) 307.0 (M++H).
Example 92 Synthesis of 2-(3-pyridyl)-5-1(2-methyl-1,3-thiazol-4-yl)ethynyllpyridine Following the procedure and mole equivalents indicated above for Example 89, pyridine-3-boronic acid (86 mg, 0.70 mmol) and 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 88 (150 mg, 0.64 mmol) were cross-coupled to obtain 2-(3-pyridyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (80 mg, 45% yield) as a pale yellow solid after eluting with 1:1 hexanes:ethyl acetate from a silica gel column. This material was then solubilized in diethyl ether (10 mL) and precipitated as the pale pink hydrochloride salt upon treatment with of I M
HCl in diethyl ether (2 mL) and trituration with fresh diethyl ether (3 x 5 mL). 'H NMR (CD3OD, 300 MHz) S
9.63 (s, 1H), 9.37 (d, J=8.2 Hz, 1H), 8.97 (s, 1H), 8.95 (d, J=5.8 Hz, 1H), 8.21-8.31 (m, 3H), 8.07 (s, 1H), 2.88 (s, 3H).
MS (ESI) 278.0 (M++H).
Example 93 Synthesis of 2-(4-pyridyl)-5-f(2-methyl-1,3-thiazol-4-yl)ethynyllpyridine Following the procedure and mole equivalents indicated above for Example 89, pyridine-4-boronic acid (86 mg, 0.70 mmol) and 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from 5 Example 88 (150 mg, 0.64 mmol) were cross-coupled to obtain 2-(4-pyridyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (30 mg, 17% yield) as an off-white solid after eluting with 2:1 ethyl acetate:hexanes from a silica gel column. This material was then solubilized in ether (10 mL) and precipitated as the pale yellow hydrochloride salt (M.p.>185 C, dec.) upon treatment with of 1M HCl in diethyl ether (2 mL) and trituration with fresh diethyl ether (3 x 5 mL).
'H NMR (CD3OD, 300 10 MHz) 5 9.01 (s, 1H), 8.98 (d, J=7.0 Hz, 2H), 8.85 (d, J=6.7 Hz, 2H), 8.40 (d, J=8.2 Hz), 8.22 (dd, J=8.2 Hz, 2.0 Hz, 1H), 7.94 (s, 1H), 2.88 (s, 3H). MS (ESI) 278.0 (M++H).
Example 94 Synthesis of 3-chloro-6-f(2-methyl-1,3-thiazol-4-yl)ethynyllpyridazine 3,6-Dichloropyridazine (299 mg, 2.00 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-15 thiazole from Example 77 (391 mg, 2.00 mmol) were dissolved in DMF (10 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (105 mg, 0.40 mmol), bis-triphenylphosphine palladium dichloride (140 mg, 0.20 mmol), Cul (76 mg, 0.40 mmol), tetrabutylammonium iodide (369 mg, 1.00 mmol), and triethylamine (1.01 g, 1.39 mL, 10.0 mmol) in DMF (15 mL) at 40 C. The reaction was warmed to 50 C, and 20 tetrabutylammonium fluoride (2.10 mmol, 2.10 mL of a 1.OM solution in THF) was added via syringe pump over 1.5 h. The reaction was then cooled to ambient temperature and poured into a separatory funnel containing 1:1 hexanes:ethyl acetate (200 mL) where it was washed with 50% dilute brine (3 x mL), dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1.5:1 hexanes:ethyl acetate, then recrystallized from 2:1 ethyl acetate:hexanes 25 to afford 3-chloro-6-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridazine (182 mg, 39% yield) as pale pink needle crystals, M.p. 197-198 C. 'H NMR (CDC13, 300 MHz) S 7.64 (d, J=8.8 Hz, 1H), 7.63 (s, 1H), 7.52 (d, J=8.8 Hz, 1H), 2.77 (s, 3H). MS (ESI) 235.9 (M++H).
Example 95 Synthesis of 3-f(2-methyl-1,3-thiazol-4-vl)ethynyll-6-phenylpyridazine 30 Phenylboronic acid (47 mg, 0.38 mmol) and 3-chloro-6-[(2-methyl-1,3-thiazol-yl)ethynyl]pyridazine from Example 94 (75 mg, 0.32 mmol) were dissolved in DME
(2 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (8.4 mg, 0.032 mmol), bis-triphenylphosphine palladium dichloride (11.2 mg, 0.0 16 mmol), and potassium carbonate (89 mg, 0.64 mmol) in DME (2 mL) and 35 H2O (4 mL) at 40 C. The reaction was stirred at reflux for 16 h, then cooled to ambient temperature and poured into a separatory funnel containing ethyl acetate (100 mL). The ethyl acetate layer was washed with saturated NaHCO3 (50 mL), and H2O (2 x 50 mL), then dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1:1 hexanes:ethyl acetate to afford 3-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-6-phenylpyridazine (43 mg, 49%
yield) as a white solid. 'H NMR (CDC13, 300 MHz) S 8.11 (m, 2H), 7.86 (d, J=8.8 Hz, 1H), 7.72 (d, J=8.8 Hz, 1H), 7.62 (s, 1H), 7.51-7.56 (m, 3H), 2.78 (s, 3H). MS (ESI) 278.0 (M+H).
Example 96 Synthesis of 4-f(6-phenyl-3-pyridinyl)ethynyll-1,3-thiazol-2-amine Phenylboronic acid (566 mg, 4.4.64 mmol) and 2,5-dibromopyridine (1.00 g, 4.22 mmol) were dissolved in DME (10 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (111 mg, 0.42 mmol), bis-triphenylphosphine palladium dichloride (148 mg, 0.21 mmol), and potassium carbonate (1.17 g, 8.44 mmol) in DME (15 mL) and H2O (25 mL) at 40 C. The reaction was stirred at reflux for 1 h, then cooled to ambient temperature and poured into a separatory funnel containing ethyl acetate (250 mL).
The ethyl acetate layer was washed with saturated NaHCO3 (50 mL), and H2O (2 x 50 mL), then dried (MgSO4), filtered, and concentrated in. vacuo. The crude residue was chromatographed on silica gel, eluting with 14:1 hexanes:ethyl acetate to afford 5-bromo-2-phenylpyridine (783 mg, 78% yield) as a white crystalline solid.
5-Bromo-2-phenylpyridine (300 mg, 1.28 mmol) and 4-[(trimethylsilyl)ethynyl]-1,3-thiazol-2-ylamine from Example 78 (210 mg, 1.07 mmol) were added as solids to a deoxygenated solution of triphenylphosphine (56 mg, 0.21 mmol), bis-triphenylphosphine palladium dichloride (75 mg, 0.11 mmol), Cu! (41 mg, 0.21 mmol), tetrabutylammonium iodide (198 mg, 0.54 mmol), and triethylamine (540 mg, 740 L, 5.4 mmol) in DMF (15 mL) at 40 C. The reaction was warmed to 60 C, and tetrabutylammonium fluoride (1.17 mmol, 1.17 mL of a 1.OM solution in THF) was added slowly over 1 h. The reaction was then cooled to ambient temperature and poured into a separatory funnel containing 1:1 hexanes:ethyl acetate (250 mL) where it was washed with 50%
dilute brine (3 x 100 mL), dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1:1 hexanes:ethyl acetate to afford 4-[(6-phenyl-3-pyridinyl)ethynyl]-1,3-thiazol-2-amine (186 mg, 63% yield) as a pale yellow solid, M.p. 194-195 C. 'H NMR
(CD3OD, 300 MHz) S
8.74 (s, 1H), 7.91-7.96 (m, 3H), 7.78 (d, J=8.3 Hz, 1H), 7.45-7.54 (m, 3H), 6.84 (s, 1H). MS (ESI) 278.0 (M++H).
Example 97 Synthesis of 3.4 dihvdro-l-naphthalenyl trifluoromethanesulfonate To a stirred solution of a-tetralone (1.00g, 6.84 mmol) in CH2CI2 (70mL) under argon at ambient temperature was added lutidine (1.20mL, 6.84 mmol) followed by dropwise addition of trifluoromethanesulfonic anhydride (1.73mL, 10.3 mmol). The reaction mixture was stirred for lh and then concentrated in vacuo and purified by flash chromatography on silica gel eluting with 10:1 hexane:ethyl acetate to afford 3, 4 dihydro-l-naphthalenyl trifluoromethanesulfonate (1.64g, 87%
yield) as a pale yellow oil. 'H NMR (CDC13, 300MHz) 6 7.36-7.32 (m, 1H), 7.29-7.24 (m, 2H), 7.20-7.16 (m, 1H), 6.03-6.00 (m, 1H), 2.90-2.85 (m, 2H), 2.55-2.48 (m, 2H).
Example 98 Synthesis of 2-(3.4-dihvdro-l-naphthalenyl)ethynylpyridine hydrochloride A stirred suspension of Cul (159 mg, 0.834 mmol), triphenylphosphine (219 mg, 0.834 mmol), PdC12(PPh3)2 (293 mg, 0.417 mmol), and triethylamine (2.9OmL, 20.8 mmol) in DME (30mL), was degassed with a stream of argon for several min. A solution of 2-ethynyl pyridine (1.30g, 12.5 mmol) and 3, 4 dihydro-l-naphthalenyl trifluoromethanesulfonate from Example 97 (1.15g, 4.17 mmol) in DME (1 OmL) was added to the mixture. The mixture was heated to 80 C for 1.5 h. The reaction mixture was cooled to ambient temperature and filtered through a pad of CeliteT"'. The filtrate was concentrated in vacuo and the crude material was purified by flash chromatography on silica gel eluting with 8:1 then 5:1 hexane:ethyl acetate to afford 2-(3,4-dihydro-l-naphthalenyl)ethynylpyridine (798mg, 72% yield) as a pale yellow oil.
2-(3,4-Dihydro-l-naphthalenyl)ethynylpyridine (300mg, 1.29 mmol) was dissolved in diethyl ether and treated with HCl in diethyl ether (2.00 mL of a 1 M solution, 2.00 mmol). Upon addition of the HCl solution a white solid precipitated from the solution. The mixture was concentrated in vacuo the pale yellow solid was recrystallized from Methanol/diethyl ether. The mother liquor was decanted and the resulting pale yellow solid was dried under high vacuum to afford 2-(3,4-dihydro-l-naphthalenyl)ethynylpyridine hydrochloride (205mg, 18% yield) as a pale yellow solid, M.p. 153-155 C. 'H NMR (CD3OD, 300MHz) 6 8.76-8.74 (m, 1H), 8.43-8.38 (m, 1H), 8.08-8.05 (d, J=8 Hz, 1H), 7.88-7.83 (m, 1H), 7.66-7.63 (d, J=8.3 Hz, 1H), 7.31-7.18 (m, 3H), 6.91-6.88 (m, 1H), 2.88-2.82 (m, 2H), 2.54-2.47 (m, 2H). MS 232 (M+H).
Example 99 Synthesis of 5-bromo-N-methoxy-N-methylnicotinamide To a stirred solution of 5-bromonicotinic acid (2.5g, 12.4 mmol) in CH2C12 (100mL) was added N, O-dimethylhydroxylamine hydrochloride (1.44g, 14.8mmol), HOBT (1.84g, 13.6mmol), and EDC
(2.61g, 13.6 mmol) sequentially as solids followed by diisopropylethylamine (6.46mL, 37.1mmol).
The mixture was stirred at ambient temperature under argon for 1 h. The reaction mixture was concentrated in vacuo and redissolved in ethyl acetate. The organic material was washed with 1M HCl and brine (3 x 25mL), dried over MgSO4i filtered and concentrated in vacuo.
The crude material was purified by flash chromatography on silica gel eluting with 1:1 hexane:ethyl acetate to afford 5-bromo-N-methoxy-N-methylnicotinamide (2.99g, 51% yield) as a colorless oil. 1H NMR
(CDC13, 300MHz) S
8.21-8.20 (m, 1H), 7.85-7.82 (m, 1H), 7.73-7.70 (m, 1H), 3.58 (s, 3H), 3.40 (s, 3H).
Example 100 Synthesis of N-methoxy-N-methyl-5-1(2-methyl-1, 3-thiazol-4-yl)ethynyll nicotinamide A stirred suspension of CuI (257 mg, 1.35 mmol), triphenylphosphine (354 mg, 1.35 mmol), PdC12(PPh3)2 (467 mg, 0.665 mmol), tetrabutylammonium iodide (1.89g, 5.12 mmol) and triethylamine (3.57 mL, 25.6 mmol) in DMF (50mL), was degassed with a stream of argon for several minutes and warmed to 40 C. 2-Methyl-4[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (1.00g, 5.12 mmol) and 5-bromo-N-methoxy-N-methylnicotinamide from Example 99 (1.63 g, 6.65 mmol) was added to the reaction mixture. The mixture was heated to 70 C and TBAF in THE
(6.65 mL, 1.0 M
solution, 6.65 mmol) was added via syringe pump over 2 h. The reaction mixture was cooled to ambient temperature and diluted with 1:1 hexane:ethyl acetate. The organic material was washed with dilute brine (3 x 25 mL), dried over MgSO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography on silica gel (2:1 then 1:1 hexane:ethyl acetate) to afford N-methoxy-N-methyl-5-[(2-methyl-1, 3-thiazol-4-yl)ethynyl] nicotinamide (708 mg, 48% yield) as an orange oil. 1H NMR (CDC13, 300MHz) 5 8.89-8.84 (m, 2H), 8.19-8.17 (m, 11-1), 7.55-7.53 (m, 1H), 3.57 (s, 3H), 3.40 (s, 3H), 2.74 (s, 3H). MS 288 (M+H).
Example 101 Synthesis of (4-fluorophenyl){5-f(2-methyl-1,3-thiazol-4-yl)ethynyll-3-ayridinyl}methanone To a stirred solution of N-methoxy-N-methyl-5-[(2-methyl-1, 3-thiazol-4-yl)ethynyl]
nicotinamide from Example 100 (50 mg, 0.174 mmol) at ambient temperature under argon was added a solution 4-fluorophenylmagnesium bromide in THE (0.696 mL, 1.OM solution, 0.696 mmol). The reaction mixture was stirred for 24 h and then diluted with H2O. The aqueous solution was extracted with ethyl acetate (3 x 25mL). The combined organic layers were washed with brine (2 x 25mL), dried over MgSO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography on silica gel eluting with 3:1 then 2:1 hexane:ethyl acetate to afford (4-fluorophenyl){5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-pyridinyl}methanone (15 mg, 27% yield) as a pale yellow solid, M.p. 132-134 C. 1H NMR (CDC13, 300MHz) S 9.02-8.95 (m, 2H), 8.20-8.19 (m, 1H), 7.89-7.85 (m, 2H), 7.48 (s, 11-1), 7.25-7.19 (m, 2H), 2.76 (s, 3H). MS
323 (MH).
Example 102 Synthesis of (4-methoxyphenyl){5-F(2-methyl-1,3-thiazol-4-vl)ethynyll-3-pyridinyllmethanone To a stirred solution of N-methoxy-N-methyl-5-[(2-methyl-1, 3-thiazol-4-yl)ethynyl]
nicotinamide from Example 100 (50 mg, 0.174 mmol) at ambient temperature under argon was added a solution 4-anisylmagnesium bromide in THE (1.39mL, 0.5M solution, 0.696 mmol).
The reaction mixture was stirred for 24 h and then diluted with H2O. The aqueous solution was extracted with ethyl acetate (3 x 25mL). The combined organic layers were washed with brine (2 x 25mL), dried over MgSO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography on silica gel eluting with 3:1 then 2:1 hexane:ethyl acetate to afford (4-methoxyphenyl){5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-pyridinyl}methanone (13 mg, 22% yield) as a pale yellow solid, M.p. 97-99 C. 'H NMR (CDC13, 300MHz) S 8.94-8.90 (m, 2H), 8.18-8.17 (m, 1H), 7.85-7.82 (m, 2H), 7.47 (s, 1H), 7.02-6.99 (m, 2H), 3.92 (s, 3H), 2.76 (s, 3H). MS 335 (MH).
Example 103 Synthesis of 2-(2-cyclopropylethvnyl)thiazole 2-Bromo-1,3-thiazole (1.31 g, 8.0 mmol), Cul (143 mg, 0.75 mmol), PdCl2 (45 mg, 0.75 mmol), PPh3 (197 mg, 0.75 mmol), and K2CO3 (4.5 g, 33 mmol) were combined in DME (50 mL) and H2O (25 mL), and argon gas was bubbled through the suspension for several min to deoxygenate the mixture. Cyclopropyl trimethylsilylacetylene (1.8 g, 13.3 mmol) was added and the reaction was heated at reflux for 12 h. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with H2O (200 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. This material was purified by column chromatography eluting with 4:1 hexane:ethyl acetate to afford 2-(2-cyclopropylethynyl)thiazole (800 mg, 67% ) as a light brown oil.
p-Toluenesulfonic acid (1.02 g, 5.4 mmol) and 2-(2-cyclopropylethynyl)thiazole (800 mg, 5.3 mmol) were dissolved in Methanol (50 mL), and the solution was concentrated in vacuo. The resulting black viscous oil was triturated with diethylether with sonication. The diethylether layer was decanted and the remaining brown gum was dried in vacuo. Material was free based with aqueous K2C03, and extracted with ethyl acetate (2 x 75 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with 4:1 hexane:ethyl acetate to afford 2-(2-cyclopropylethynyl)thiazole (150 mg, 19%) as an oil. 'H NMR
(CDC13, 300 MHz) S 7.75 (d, J= 3 Hz, 1H), 7.25 (d, J= 3 Hz, 1H), 1.50 (m, 1H), 0.93 (m, 4H). MS (API-ES Positive) 150 (M+H).
Example 104 Synthesis of 3-(2-pyridinylethynyl)-2-cvclohexen-l-one A solution of 2-ethynylpyridine (10.3 g, 100 mmol) in THE (200 mL) was cooled to -50 C and a solution of n-BuLi (100 mmol, 2.0 M in hexane) was added slowly keeping the solution temperature 5 below -40 C. After 30 min at reduced temperature the solution became opaque, brown and slightly viscous. 3-Ethoxy-2-cyclohexen- l -one (15.4 g, 110 mmol) was added all at once and the solution was allowed to warm slowly to ambient temperature with stirring. After 12 h the dark solution was acidified with HCl (400 mmol, 2.0 M), followed after 30 min by basification with solid K2CO3. The mixture was partitioned between ethyl acetate and H2O, the H2O layer was washed with a further 10 portion of ethyl acetate, the combined organic layers were washed with H2O
(200 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with 2:1 to 1:1 hexane:ethyl acetate to afford a yellow oil (10.5 g, 53%). This material was crystallized from ethyl acetate to afford two crops of light yellow flakes (5.9 g, 30%) M.P, 74-75 C. 'H NMR (CDC13, 300 MHz) S 8.64 (m, 1H), 7.72 (m, 1H), 7.51 (m, 1H), 7.30 15 (m, IH), 6.37 (m, 1H), 2.59 (m, 2H), 2.46 (m, 2H), 2.09 (m, 2H). MS (ESI) 197 (M+).
Example 105 .Synthesis of 3-(2-pyridinylethynyl)-2-cvclohexen-l-one oxime Hydroxylamine hydrochloride (350 mg, 5.0 mmol) and KOH (560 mg, 10 mmol) were dissolved in wet ethanol (15 mL). 3-(2-Pyridinylethynyl)-2-cyclohexen- 1 -one from Example 104 (0.5 20 g, 2.5 mmol) was added and the mixture heated at reflux for 2 h. The solution was allowed to cool and the solids filtered. The ethanol soluble portion was concentrated in vacuo and the residue was purified by flash column chromatography on silica gel eluting with ethyl acetate to afford 3-(2-pyridinylethynyl)-2-cyclohexen-1-one oxime (375 mg, 70 % ) as a tan solid.
M.p. 125-127 C. 1H NMR
(CDCl3, 300 MHz) S 8.58 (m, 1H), 7.68 (m, 1H), 7.47 (m, 1H), 7.24 (m, 1H), 6.75 (s, 1H), 2.65 (m, 25 2H), 2.41 (m, 2H), 1.84 (m, 2H). MS (API-ES positive) 213 (M+H).
Example 106 Synthesis of (E, Z)-3-(2-pyridinylethynyl)-2-cyclohexene-l-one 0-methyloxime To a solution of 3-(2-pyridinylethynyl)-2-cyclohexene-l-one from Example 104 (10 mg, 0.05 mmol) in ethanol (0.3 mL) was added methoxylamine hydrochloride (30-35 wt. %
in H2O; 7 l, 0.05 30 mmol) in a 10 ml Teflon reaction tube. Piperidinomethyl polystyrene (28 mg of 3.63 mmol/g beads, 0.1 mmol) was added and the resulting suspension was heated at 80 C in an orbital shaker. After shaking at C for 16 h, the reaction was cooled to ambient temperature and chloroformate polystyrene (47.5 mg of 1.0 mmol/g beads, 0.05 mmol) was added. The reaction was allowed to shake at 40 C for 1 hour, then cooled to ambient temperature, and tris (2-aminoethyl)amine polystyrene (11 mg of 4.5 mmol/g 35 beads, 0.05 mmol) was added. The reaction was then allowed to shake at 40 C
for 1 hour, then cooled, and diethyl ether (0.3 ml) was added. The reaction was vortexed and filtered using a fitted syringe attached to a vacuum block. The collected sample was then concentrated in vacuo using a Savant rotary evaporator to afford 3-(2-pyridinylethynyl)-2-cyclohexene-l-one 0-methyloxime as a mixture of E, Z, isomers (12 mg, 90% yield) as a light brown oil. 1 H NMR (CDC13, 300 MHz) 8 8.61-8.59 (m, 111), 7.68-7.67 (m, 1H), 7.47-7.44 (m, 1H), 7.28-7.23 (m, 1H), 7.17-6.57 (m, IH), 3.90 (d J=10.9 Hz, 1H), 2.57-2.52 (m, 2H), 2.47-2.39 (m, 2H), 1.91-1.88 (m, 2H), 1.83-1.79 (m, 2H); MS
(ESI) 226.28 (M++H).
Example 107 Synthesis of (EZ)-3-(2-pyridinylethynyl)-2-cyclohexen-1-one O-ethyloxime To a solution of 3-(2-pyridinylethynyl)-2-cyclohexene-l-one from Example 104 (20 mg, 0.10 mmol) in ethanol (0.6 mL) was added O-ethylhydroxylamine hydrochloride (10 mg, 0.10 mmol) in a 10 ml Teflon reaction tube. Piperidinomethyl polystyrene (56mg of 3.63 mmol/g beads, 0.2 mmol) was added and the resulting suspension was heated at 80 C in an orbital shaker.
After shaking at 80 C for 16 h, the reaction was cooled to ambient temperature and chloroformate polystyrene (95 mg of 1.0 mmol/g beads, 0.10 mmol) was added. The reaction was allowed to shake at 40 C
for 1 hour, cooled to ambient temperature, and treated with tris (2-aminoethyl)amine polystyrene (22 mg of 4.5 mmol/g beads, 0.10 mmol). The reaction was then allowed to shake at 40 C for 1 hour, then cooled, and diethyl ether (0.6 ml) was added. The reaction was vortexed and filtered using a fritted syringe attached to a vacuum block. The collected sample was then concentrated in vacuo using a Savant rotary evaporator to afford 3-(2-pyridinylethynyl)-2-cyclohexen-l-one O-ethyloxime as a mixture of E, Z isomers (22 mg, 91% yield) as a light brown oil. 'H NMR (CDC13, 300 MHz) 8 8.61-8.59 (m, 1H), 7.70-7.63 (m, 1H), 7.47-7.43 (m, 1H), 7.28-7.23 (m, 1H), 7.22-6.58 (m, 1H), 4.20-4.10 (m, 2H), 2.56 (t J=6.6 Hz, 2H), 2.47-2.38 (m, 2H), 2.47-2.39 (m, 2H), 1.94-1.87 (m, 2H), 1.85-1.76 (m, 2H), 1.29 (t J=6.0 Hz, 3H); MS (ESI) 240.30 (M+H).
Example 108 Synthesis of E/Z-3-(2-pyridinylethynyl)-2-cyclohexen-1-one 0-allyloxime To a solution of 3-(2-pyridinylethynyl)-2-cyclohexen-l-one from Example 104 (513 mg, 2.60 mmol) in ethanol (15 mL) was added O-allylhydroxylamine hydrochloride (393 mg, 3.59 mmol).
Piperidinomethyl polystyrene (1.54 g of 3.63 mmol/g beads, 5.6 mmol) was added and the resulting suspension was heated in an oil bath at 80 C. After stirring at 80 C for 16 h, TLC analysis showed no starting 3-(2-pyridinylethynyl)-2-cyclohexen- 1 -one remaining. The reaction mixture was cooled, diluted with ether, and filtered through a glass frit to remove the resin. The filtrate was concentrated to afford a yellow oil which was purified by column chromatography eluting with hexane, 20:1, 9:1, then 8.5:1.5 hexane:ethyl acetate to afford E,Z-3-(2-pyridinylethynyl)-2-cyclohexen-l-one O-allyloxime (550 mg, 83% yield) as a light brown oil. 'H NMR (CDC13, 300 MHz) S 8.63-8.60 (m, 1H), 7.70-7.64 (m, I H), 7.48-7.44 (m, I H), 7.28-7.22 (m, I H), 6.60-6.59 (m, 1H), 6.07-5.96 (m, I H), 5.36-5.22 (m, 2H), 4.64-4.59 (m, 2H), 2.62-2.58 (m, 114), 2.49-2.40 (m, 2H), 1.95-1.78 (m, 2H); MS (ESI) 253.1 (M++H).
Example 109 Synthesis of (Z)-methyl-f3-(2-pyridinylethynyl)-2-cyclohexen-l-ylidenelethanoate Trimethylphosphonoacetate (462 mg, 2.5 mmol) was dissolved in THE (20 mL) and the solution was cooled to 0 C at which time LiHDMS (2.6 mL, 1.0 M in THF) was added slowly. After 30 min 3-(2-pyridinylethynyl)-2-cyclohexen-1-one from Example 104 (0.5 g, 2.5 mmol) was added and the solution was allowed to warm to ambient temperature. After a further 3 h the mixture was partitioned between ethyl acetate and H2O, the aqueous layer was washed with a further portion of ethyl acetate, the combined organic layers were washed with H2O (50 mL), brine (30 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting on silica gel with 1.5:1 then 1:1 hexane:ethyl acetate to yield methyl-[3-(2-pyridinylethynyl)-2-cyclohexen-1-ylidene]ethanoate as a mixture of E and Z double bond isomers.
This mixture was further purified by reverse phase HPLC to obtain a major isomer and a minor isomer. The major isomer was identified as the Z-isomer based on the lack of NOESY correlation between the two vinyl protons. MP 65-68 C; 1H NMR (CDC13, 300 MHz) 8 8.60 (d, J=5 Hz, 1H), 7.98 (m, 1H), 7.67 (m, 1H), 7.47 (m, 1H), 7.23 (m, 1H), 5.57 (s, 1H), 3.73 (s, 3H), 2.44 (m, 3H), 1.84 (m, 3H); MS (API-ES
positive) 254 (M+H).
Example 110 Synthesis of 2-ff(3S)-3-methyl-l-cvclopenten-l-vllethynvl}pyridine & 2-ff(4S)-4-methyl-1-cyclopenten-l-yll ethynyll pyrid ine To a solution of 2-ethynylpyridine (0.6 mL, 6.0 mmol) in THE (2 mL) at -40 C
was added n-butyllithium (3.75 mL, 6.0 mmol). After stirring at reduced temperature for 30 min the solution was added rapidly to a solution of (R)-(+)-3-methylcyclopentanone (0.65 mL, 6.0 mmol) in THE (10 mL).
The mixture was allowed to warm to ambient temperature over 16 h, then partitioned between H2O and ethyl acetate. The organic layer was dried over anhydrous Na2SO4, and concentrated in vacuo. The crude product was purified by flash column chromatography on silica gel eluting with 1:1 hexane:ethyl acetate to afford (R)-(+)-3-methyl-l-(2-pyridinylethynyl)cyclopentanol as a dark oil. This material was dissolved in pyridine/CH2C12 (10 mL, 1/1), POC13 (0.55 mL, 6.0 mmol) was added, and the mixture was heated to reflux for 4 h. After cooling, the POC13 and pyridine were removed in vacuo, and the residue was partitioned between H2O and ethyl acetate. The organic layer was dried over anhydrous Na2SO4, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with 2:1 hexane:ethyl acetate to afford 2-{[(3S)-3-methyl-l-cyclopenten-1-yl]ethynyl}pyridine and 2-{[(4S)-4-methyl-l-cyclopenten-1-yl]ethynyl}pyridine (0.425 g, 38% ) as a dark brown oil. 'H
NMR (CDC13, 300 MHz) 8 8.57 (d, J=9 Hz, 1H), 7.63 (m, 1H), 7.42 (m, 1H), 7.20 (m, 1H), 6.17 (m, 1H), 2.90 (m, 0.5H), 2.61 (m, 2H), 2.16 (m, 2H), 1.47 (m, 0.5H), 1.06 (d, J=12 Hz, 3H). GC/MS two peaks 11.88 and 11.91 min. (ESI) 182 (M+).
Example 111 Synthesis of 2-1(3,5-dimethvl-l-cvclohexen-l-yI)ethynyllpyridine The procedure was carried out as for Example 110 using 3,5-cis-dimethylcyclohexanone (756 mg, 6.0 mmol), to give 2-[(3,5-dimethyl-l-cyclohexen-1-yl)ethynyl]pyridine (0.325 g, 25% ) as a yellow oil. 'H NMR (CDC13, 300 MHz) 6 8.57 (m, 1H), 7.63 (m, 1H), 7.41 (m, 1H), 7.18 (m, 1H), 6.15 (m, 1H), 2.27 (m, 2H), 1.79 (m, 3H), 1.01 (m, 7H). GC/MS 12.96 min. (ESI) 211 (M+).
Example 112 Synthesis of 2-f(3,4-dimethvl-l-cyclopenten-l-yl)ethynyllpyridine The procedure was carried out as for Example 110 using 3,4-dimethylcyclopentanone (672 mg, 6.0 mmol), to yield a mixture of cis and trans 2-[(3,4-dimethyl-1-cyclopenten-1-yl)ethynyl]pyridine (0.51 g, 43% ) as a yellow oil. 'H NMR (CDC13, 300 MHz) S 8.57 (m, 1 H), 7.63 (m, 1H), 7.43 (m, 1H), 7.19 (m, I H), 6.14 (m, I H), 2.64-2.80 (m, 2H), 2.43 (m, I H), 2.22 (m, 1H), 1.89 (m, 1H), 1.07 (m, 3H), 0.94 (m, 3H). GC/MS two peaks 12.15 and 112.44 min. (ESI) 196 (M+).
Example 113 Synthesis of -{15-(trifluoromethyl)-1-cvclohexen-l-vllethynyl}pyridine & 2-{13-(trifluoromethyl)-1-cvclohexen-l-yll ethynyl}pyridine The procedure was carried out as for Example 110 using 3-trifluoromethylcyclohexanone (960 mg, 6.0 mmol), to yield a 3:1 mixture of 2-{[5-(trifluoromethyl)-1-cyclohexen-1-yl]ethynyl}pyridine and 2-{[3-(trifluoromethyl)-1-cyclohexen-1-yl]ethynyl}pyridine (0.51 g, 43% ) as a brown oil. 'H
NMR (CDC13, 300 MHz) S 8.57 (m, 1H), 7.65 (m, 1H), 7.43 (m, 1H), 7.21 (m, 1H), 6.32 (m, 0.75H), 6.21 (m, 0.25H), 2.98 (m, 0.25H), 2.25-2.57 (m, 3.5H), 2.01 (m, 2H), 1.58 (m, 1H), 1.29 (m, 0.25H).
GC/MS three peaks 12.22, 12.37 and 12.49 min. (ESI) 251 (M+), 252 (M+H).
Example 114 Synthesis of 2-(1,4,4a,5,6,7,8,8a-octahvdro-2-naphthalenylethynyl)pyridine and 2-(3,4,4a,5,6,7,8,8a-octahvdro-2-naphthalenylethynyl)pyridine The procedure was carried out as for Example 110 using cis/traps 2-decalone (1.83 g, 12 mmol) to yield a mixture of four stereoisomers each of 2-(1,4,4a,5,6,7,8,8a-octahydro-2-naphthalenylethynyl)pyridine & 2-(3,4,4a,5,6,7,8,8a-octahydro-2-naphthalenylethynyl)pyridine (0.50 g, 9%) as a brown oil. 1H NMR (CDC13, 300 MHz) 8 8.57 (d, J=5 Hz, 1H), 7.63 (m, 1H), 7.37 (m, 1H), 7.18 (m, IH), 6.27 (m, 0.5H), 6.20 (m, 0.5H), 2.05-2.34 (m, 3H), 1.79 (m, 3H), 1.48 (m, 7H), 1.00 (m, 1H). MS (API-ES positive) 238 (M+H).
Example 115 Synthesis of 2-1(3-methyl-l-cyclohexen-l-yl)ethynyl]pyridine A solution of 3-methyl-2-cyclohexen-l-one (990 mg, 9.0 mmol) in THE was chilled to -78 C
and L-selectride (9.5 mmol, 1.0 M in THF) was added slowly via syringe. After 1 h at reduced temperature N-phenyltriflimide (3.2 g, 9.0 mmol) was added all at once. The reaction was allowed to warm to ambient temperature while stirring overnight. The reaction was diluted with two volumes of hexane, and the organic phase was washed with H2O, then 10% aqueous NaOH and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with hexane to afford 3-methyl-l-cyclohexen-1-yl trifluoromethanesulfonate (400 mg, 18% ).
3-methyl-l-cyclohexen-1-yl trifluoromethanesulfonate (400 mg, 1.6 mmol), CuI
(30 mg, 0.15 mmol), PdC12 (9 mg, 0.05 mmol), PPh3 (40 mg, 0.15 mmol), and K2CO3 (552 mg, 4.0 mmol) were combined in DME (15 mL) and H2O (15 mL), and argon gas was bubbled through the suspension for several min to deoxygenate the mixture. 2-Ethynylpyridine (412 mg, 4.0 mmol) was added and the reaction mixture was stirred at ambient temperature for 16 h and then heated at reflux for 1 h. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with H2O (100 mL), brine (50 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with 3:1 hexane:ethyl acetate to afford 2-[(3-methyl-l-cyclohexen-1-yl)ethynyl]pyridine (250 mg, 80%) as a clear oil containing 5% of a regioisomer.'H NMR (CDCl3, 300 MHz) S 8.56 (m, 1H), 7.62 (m, 1H), 7.40 (m, 1H), 7.18 (m, 1H), 6.18 (m, 1H), 2.31 (m, 1H), 2.21 (m, 2H), 1.79 (m, 2H), 1.55 (m, 1H), 1.18 (m, I H), 1.02 (d, J=7 Hz, 3H). MS (API-ES positive) 198 (M+H).
Example 116 Synthesis of 5-methyl-l-cyclohexen-l-yl trifluoromethanesulfonate To a solution of 5-methyl-1,3-cyclohexanedione (1.0 g, 7.9 mmol) in ethanol (25 mL) was added p-toluenesulfonic acid (85 mg, 0.5 mmol), and the reaction was heated to 60 C for 16 h. The reaction was cooled and concentrated in vacuo. The residue was purified by flash column chromatography on silica eluting with hexane to give 3-ethoxy-5-methyl-2-cyclohexen-l-one (1.2 g, quantitative yield) as a clear oil.
3-Ethoxy-5-methyl-2-cyclohexen-l-one (1.2 g, 7.8 mmol) was dissolved in THE
(25 mL).
LiAlH4 (3.5 mmol, 1.OM in THF) was added, and the reaction was allowed to stir at ambient temperature for 3 h. H2SO4 (10% aqueous, 25 mL) was added slowly and the mixture was partitioned between H2O and ethyl acetate. The organics were concentrated in vacuo to give 5-methyl-2-cyclohexen-l-one (715 mg, 83%) as a clear oil.
A solution of 5-methyl-2-cyclohexen-l-one (715 mg, 6.5 mmol) in THE was chilled to -78 C
and L-selectride (6.0 mmol, 1.0 M in THF) was added slowly via syringe. After I h at reduced 5 temperature N-phenyltriflimide (1.8 g, 5.0 mmol) was added all at once. The reaction was allowed to warm to ambient temperature while stirring overnight. The reaction was diluted with two volumes of hexane, and the organics were washed with H2O, then 10% aqueous NaOH and concentrated in vacuo.
The residue was purified by flash column chromatography on silica gel eluting with hexane to afford 5-methyl-1-cyclohexen-1-yl trifluoromethanesulfonate (450 mg, 28% ). 'H NMR
(CDC13, 300 MHz) S
10 5.74 (m, I H), 2.34 (m, I H), 2.20 (m, 2H), 2.02 (m, I H), 1.90 (m, I H), 1.70 (m, I H), 1.23 (m, 1H), 1.03 (d, J=6.5 Hz, 3H). MS (EI ionization) 244 (M+).
Example 117 Synthesis of 2-f(5-methyl-l-cyclohexen-l-yl)ethynyl]pyridine 5-Methyl-l-cyclohexen-l-yl trifluoromethanesulfonate (450 mg, 1.8 mmol), CuI
(57 mg, 0.3 15 mmol), PdC12 (18 mg, 0.1 mmol), PPh3 (79 mg, 0.3 mmol), and K2CO3 (640 mg, 4.7 mmol) were combined in DME (20 mL) and H2O (20 mL), and argon gas was bubbled through the suspension for several min to deoxygenate the mixture. 2-Ethynylpyridine (484 mg, 4.7 mmol) was added and the reaction stirred at ambient temperature for 16 h, then heated at reflux for 1 h. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates 20 were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with H2O
(100 mL), brine (50 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with 3:1 hexane:ethyl acetate to afford 2-[(5-methyl-1-cyclohexen-1-yl)ethynyl]pyridine (290 mg, 82%) as a light yellow oil.
'H NMR (CDCl3, 300 MHz) S 8.56 (m, 1H), 7.62 (m, 1H), 7.40 (m, 1H), 7.17 (m, 1H), 6.31 (m, 1H), 2.33 (m, 1H), 2.20 (m, 25 2H), 1.89 (m, 1H), 1.71 (m, 2H), 1.22 (m, 1H), 0.99 (d, J= 6.5 Hz, 3H).
Example 118 Synthesis of 3-(2-pyridinylethynyl)-2-cvclohexen-l-ol 3-(2-Pyridinylethynyl)-2-cyclohexen- 1 -one from Example 104 (294 mg, 1.5 mmol) and CeC13 heptahydrate (381 mg, 1.0 mmol) were dissolved in CH3OH (16 mL). NaBH4 (127 mg, 3.4 mmol) was 30 added portionwise over 5 min. After 15 min. the reaction was quenched with H2O and partitioned between H2O and ethyl acetate. The organics were washed with aq. NH4Cl, dried over Na2SO4i filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with 1:1 hexane:ethyl acetate to afford a clear oil (275 mg, 92% ).
p-Toluenesulfonic acid (263 mg, 1.4 mmol) and 3-(2-pyridinylethynyl)-2-cyclohexen-l-ol (275 mg, 1.4 mmol) were dissolved in ethanol:Methanol (1:1, 40 mL), and the solution was concentrated in vacuo. The resulting viscous oil was triturated with diethylether and sonicated. The diethylether layer was decanted and remaining oil was dried in vacuo. This material was free based with aqueous K2CO3, and extracted with ethyl acetate (2 x 35 mL), dried over Na2SO4, filtered and concentrated in vacuo.
The residue was purified by column chromatography silica gel eluting with 3:2 hexane:ethyl acetate to afford 3-(2-pyridinylethynyl)-2-cyclohexen-l-ol (160 mg, 57% ) as a clear oil.
'H NMR (CDC13, 300 MHz) S 8.57 (m, 1H), 7.65 (m, 1H), 7.42 (m, 1H), 7.22 (m, 1H), 6.33 (m, 1H), 4.32 (m, 1H), 2.25 (m, 2H), 2.13 (m, 1H), 1.87 (br in, 2H), 1.63 (m, 2H). MS (API-ES Positive) 199 (M+).
Example 119 Synthesis of 4, 6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate To a stirred solution of 4,6-dimethyl-2-hydroxypyrimidine (5.0 g, 40 mmol) in anhydrous CH2C12 (100 mL) was added triethylamine (11.2 mL, 80 mmol), followed by slow addition of trifluoromethanesulfonic anhydride (6.8 mL, 40 mmol) at 0 C under argon. The reaction mixture was allowed to warm to 22 C and stirred overnight. The reaction mixture was then diluted with CH2Cl2 (100 mL). The organic phase was washed with sat. NaC1 (3 x 20 mL), dried (MgSO4), filtered and concentrated under reduced pressure to give a dark oil. Purification by flash chromatography on silica gel eluting with 3:1 hexane:ethyl acetate afforded 4, 6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate as a brown oil (6.0 g, 58%). 'H NMR (CDC13) S: 7.10 (s, 1 H), 2.45 (s, 6 H).
Example 120 Synthesis of 4,6-dimethvl-2-(phenylethynyl)pyrimidine hydrochloride A stirred solution of 4, 6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate from Example 119 (5.0 g, 19.5 mmol) in 2:1 DME:H20 (100 mL) was degassed with argon for 10 min.
Then K2CO3 (6.7 g, 48.8 mmol), Cul (0.37 g, 1.95 mmol), PdC12(Ph3P)2 (0.68 g, 0.98 mmol) and phenylacetylene (5.4 mL, 48.8 mmol) were added at 22 C. The resulting mixture was then heated at 90 C for 2 h under argon. The reaction mixture was then cooled to 22 C and filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure to give, after purification by flash chromatography on silica gel eluting with 3:1 hexane:ethyl acetate, the desired compound as a brown crystal which was subsequently treated with a solution of 1M HCl in diethyl ether (20 mL) to yield 4,6-dimethyl-2-(phenylethynyl)pyrimidine hydrochloride as a yellow solid (3.0 g, 55%). M.P
149-150 C. 'H NMR
(CD3OD) S: 7.76-7.73 (m, 2 H), 7.67 (s, 1 H), 7.60-7.49 (m, 3 H), 2.69 (s, 3 H) ppm; MS(ES): 209 (M+H)+.
Example 121 Synthesis of 3-(6-methyl-2-pyridinyl)2-propyn-l-ol A solution of 2-bromo-6-methylpyridine (2.5 g, 14.5 mmol) in 2:1 DME:H2O (30 mL) was degassed with argon for 10 min. Then PdC12(Ph3P)2 (1.0 g, 1.4 mmol), Cul (0.8 g, 4.3 mmol), K2CO3 (5.0 g, 36.3 mmol) were added followed by propargyl alcohol (2.1 mL, 36.3 mmol). The resulting mixture was heated at 90 C under argon for 2 h, allowed to cool to 22 C, then filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel eluting with 2:1 ethyl acetate:hexane to give the cross-coupled product 3-(6-methyl-2-pyridinyl)2-propyn-l-ol as a yellow solid (1.0 g, 47%). 'H NMR
(CDC13) S: 7.58-7.53 (m, 1 H), 7.27-7.25 (d, J = 7.5 Hz, I H), 7.13-7.10 (d, J = 7.8 Hz, 1 H), 4.54 (s, 2 H), 2.55 (s, 3 H).
Example 122 Synthesis of 3-(6-methyl-2-pyridinyl)-2-propynyl methanesulfonate To a stirred solution of 3-(6-methyl-2-pyridinyl)2-propyn-l-ol from Example 121 (1.0 g, 6.8 mmol) in anhydrous CH2C12 (20 mL) was added triethylamine (1.0 mL, 7.5 mmol) followed by methanesulfonyl chloride (0.6 mL, 7.5 mmol) at 0 C under argon. After 2 h the reaction mixture was diluted with CH2C12 (50 mL), the organic phase was washed with sat. NaHCO3 (3 x 10 mL) and sat.
NaCl (3 x 10 mL), dried (MgSO4), filtered and concentrated under reduced pressure to afford 3-(6-methyl-2-pyridinyl)-2-propynyl methanesulfonate as a brown oil (1.4 g, 89%) that was used in the next step without further purification. 'H NMR (CDC13) S: 7.68-7.62 (m, 1 H), 7.28 (d, J = 7.5 Hz, 1 H), 7.15 (d, J = 7.8 Hz, 1 H), 4.55 (s, 2 H), 3.09 (s, 3 H), 2.57 (s, 3 H).
Example 123 Synthesis of 2-methyl-6-(3-phenyl-l-propynyl)pyridine To a stirred solution of 3-(6-methyl-2-pyridinyl)-2-propynyl methanesulfonate from Example 122 (1.2 g, 5.3 mmol) in anhydrous THE (10 mL) under argon at 0 C was added phenylmagnesium bromide (2.1 mL, 6.4 mmol). The reaction mixture was then warmed to 22 C, stirred for 1 h then diluted with ethyl acetate (50 mL). The organic phase was washed with sat.
NaHCO3 (3 x IOmL), H2O
(3 x 10 mL) and sat. NaCI (3 x 10 mL), dried (MgSO4), filtered and concentrated under reduced pressure to give a dark oil. Purification by flash chromatography on silica gel eluting with 4:1 hexane: ethyl acetate to afford 2-methyl-6-(3-phenyl-l-propynyl)pyridine as a brown oil (360 mg, 33%).
'H NMR (CDC13) 6: 7.54-7.50 (m, 1 H), 7.37-7.19 (m, 5 H), 7.09-7.06 (d, J =
7.8 Hz, 1 H), 6.93-6.90 (d, J = 7.5 Hz, 1 H), 3.79 (s, 2H), 2.55 (s, 3H).
Example 124 Synthesis of 2-methyl-6-(3-phenyl-1.2-propadienvl)pyridine To a stirred solution of 2-methyl-6-(3-phenyl-l-propynyl)pyridine from Example 123 (100 mg, 0.48 mmol) in anhydrous THE (10 mL) at -78 C under argon was slowly added n-BuLi (2.5 M in hexane, 0.23 mL, 0.58 mmol). The resulting reddish reaction mixture was stirred for 30 min, then quenched with Methanol (1 mL). The reaction mixture was then warmed to 22 C
and taken up in ethyl acetate (50 mL). The organic phase was washed with H2O (3 x 15 mL) and sat.
NaC1(3 x 15 mL), dried (MgSO4), filtered and concentrated under reduced pressure. Purification by flash chromatography on silica gel eluting with 6:1 hexane:ethyl acetate afforded 2-methyl-6-(3-phenyl-1,2-propadienyl)pyridine as a yellow oil (40 mg, 40%). MS(ES): 208 (M+H)+, 'H NMR (CDC13) S: 7.51-7.45 (m, 1 H), 7.39-7.21 (m, 6 H), 6.99-6.96 (d, J = 7.5 Hz, 1 H), 6.77-6.75 (d, J = 6.6 Hz,1 H), 6.65-6.62 (d, J = 6.6 Hz, .1 H), 2.55 (s, 3 H).
Example 125 Synthesis of methyl 2-11(trifluoromethyl)sulfonylloxy}-1-cyclopentene-l-carboxylate To a stirred solution of methyl 2-oxocyclopentane carboxylate (5.0 g, 35.2 mmol) in anhydrous CH2C12 under argon at 0 C (40 mL) was added NaH (60 % in oil, 1.4 g, 35.2 mmol). After stirring for 10 min the resulting yellow cloudy suspension was treated with trifluoromethanesulfonic anhydride (7.1 mL, 42.2 mmol). The reaction mixture was then warmed to 22 C and after 2 h the reaction was treated with 10% HCl (100 mL). The aqueous phase was extracted with CH2C12 (3 x 40 mL), the combined organic extracts were washed with sat. NaCI (3 x 50 mL), dried (MgSO4), filtered and concentrated. The resulting residue was purified by flash chromatography on silica gel eluting with 20:1 hexane:ethyl acetate to afford methyl 2-{[(trifluoromethyl)sulfonyl]oxy}-1-cyclopentene-l-carboxylate as a colorless oil (6.5 g, 67%). 'H NMR (CDC13) S: 3.80 (s, 3 H), 2.78-2.69 (m, 4 H), 2.00-2.00 (m, 2 H).
Example 126 Synthesis of methyl 2-(2-pyridinylethynyl)-1-cyclopentene-1-carboxvlate A solution of methyl 2-{[(trifluoromethyl)sulfonyl]oxy)-1-cyclopentene-l-carboxylate from Example 125 (2.0 g, 7.2 mmol) in DMF at 22 C was degassed with argon for 10 min. Triethylamine (2.5 mL, 18 mmol), Cu! (0.41 g, 2.2 mmol), PdC12(Ph3P)2 (0.5 g, 0.72 mmol), n-Bu4NI (8.0 g, 21.6 mmol) and 2-ethynylpyridine (1.9 g, 18.0 mmol) were added at 22 C and the resulting mixture was heated at 90 C for 2 h under argon. The reaction mixture was allowed to cool to 22 C and filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure to give, after purification by flash chromatography on silica gel eluting with 4:1 hexane:ethyl acetate, methyl 2-(2-pyridinylethynyl)-1-cyclopentene-l-carboxylate as a brown solid (1.2 g, 72 %).
M.P. 45-46 C.
MS(ES): 228 (M+H)+,'H NMR (CDC13) S: 8.63-8.61 (m, 1 H), 7.68-7.65 (m, 1 H), 7.55-7.53 (m, 1 H), 7.26-7.23 (m, 1 H), 3.81 (s, 3 H), 2.81-2.75 (m, 4 H), 2.01-1.90 (m, 2 H).
Example 127 Synthesis of 2-(2-pyridinylethylnyl)-1-cyclopentene-l-carboxylic acid To a solution of methyl 2-(2-pyridinylethynyl)-1-cyclopentene-l-carboxylate from Example 126 (1.0 g, 4.4 mol) in 3:1 Methanol:H20 (20 ml) was added LiOH.H2O (0.55 g, 13.2 mmol). After stirring at 22 C for 5 h the reaction mixture was treated with 10% HCl (100 mL). The aqueous phase was extracted with CH2C12 (3 x 40 mL) and the combined organic extracts were washed with sat. NaCl (3 x 50 mL), dried (MgSO4), filtered and concentrated under reduced pressure to give a crude solid.
Purification by flash chromatography on silica gel eluting with 10:1 CH2CI2:CH3OH afforded 2-(2-pyridinylethylnyl)-1-cyclopentene-l-carboxylic acid as a gray solid (330 mg, 35%). M.P. 151-152 C.
MS(ES): 214 (M+H)+, 'H NMR (CD3OD) S: 8.53-8.50 (m, 1 H), 7.88-7.82 (m 1 H), 7.62-7.59 (m, 1 H), 7.43-7.38 (m, 1 H), 2.81-2.72 (m, 4 H), 2.06-1.96 (m, 2 H).
Example 128 Synthesis of 1{12-(2-pyridinylethylnyl)-1-cyclopentene-l-vllcarbonvl}piperidine hydrochloride To a stirred solution of 2-(2-pyridinylethylnyl)-1-cyclopentene-l-carboxylic acid from Example 127 (100 mg, 0.47 mmol) in CH2CI2 (2 mL) was added HOBT (95 mg, 0.70 mmol), EDCI
(135 mg, 0.70 mmol), triethylamine (0.2 mL, 1.4 mmol) and piperidine (0.07 mL, 0.70 mmol) at 22 C.
The reaction mixture was stirred for 18 h, then diluted with CH2CI2 (50 mL).
The organic phase was washed with sat. NaHCO3 (2 x 25 mL) and sat. NaCl (2 x 25), dried (MgSO4), filtered and concentrated in vacuo to give a yellow oil. Purification by flash chromatography on silica gel eluting with 1:1 hexane:ethyl acetate afforded 1 {[2-(2-pyridinylethylnyl)-1-cyclopentene-1-yl]carbonyl}piperidine as a yellow oil which was treated with 1M HCI in diethyl ether (5 mL) to yield 1 {[2-(2-pyridinylethylnyl)-1-cyclopentene-1-yl]carbonyl}piperidine hydrochloride as a yellow foam (40 mg, 27%). MS(ES): 281 (M+H)+, 'H NMR (CDC13) 6: 8.75 (br, 1 H), 8.21 (br, 1 H), 7.74-7.73 (m, 2 H), 3.71 (m, 2 H), 3.53 (m, 2 H), 2.84-2.79 (m, 4 H), 2.11-2.05 (m, 2 H), 1.69-1.61 (m, 6 H).
Example 129 Synthesis of 1-methyl-4-{12-(2-pyridinylethylnyl)-1-cyclopentene-l-vllcarbonvl}piperazine hydrochloride To a stirred solution of 2-(2-pyridinylethylnyl)-1-cyclopentene-l-carboxylic acid from Example 127 (100 mg, 0.47 mmol) in CH2C12 (2 mL) was added HOBT (95 mg, 0.70 mmol), EDCI
(135 mg, 0.70 mmol), triethylamine (0.2 mL, 1.4 mmol) and 1-methylpiperazine (123 mg, 0.70 mmol) at 22 C. The reaction mixture was stirred for 18 h and then diluted with an additional amount of CH2C12 (50 mL). The organic phase was washed with sat. NaHCO3 (2 x 25 mL) and sat.
NaCl (2 x 25), dried (MgSO4), filtered and concentrated in vacuo to give a yellow oil. Purification by flash chromatography on silica gel eluting with 10:1 CH2C12:CH3OH afforded 1-methyl-4-{[2-(2-pyridinylethylnyl)-1-cyclopentene-1-yl]carbonyl}piperazine as a yellow oil which was treated with 1M HCl in diethyl ether (5 mL) to yield 1-methyl-4-{[2-(2-pyridinylethylnyl)-1-cyclopentene-1-yl]carbonyl}piperazine 5 hydrochloride as a yellow foam (130 mg, 78%). MS(ES): 296 (M+H)+,'H NMR
(CDC13) S: 8.66 (br, 1 H), 8.31 (br, 1 H), 7.82 (br, 2 H), 4.75 (m, 1 H), 4.10 (m, 2 H), 3.80 (m, 3 H), 3.36 (m, 2 H), 3.07 (s, 3 H), 2.79 (m, 4 H), 2.15 (m, 2 H).
Example 130 Synthesis of 4-(4-pyrimidinyl)phenyl trifluoromethanesulfonate 10 To a stirred solution of 4-(4-pyrimidinyl)phenol (250 mg, 1.45 mmol) in anhydrous CH2C12 (100 mL) was added triethylamine (0.4 mL, 2.9 mmol) followed by slow addition of trifluoromethanesulfonic anhydride (0.25 mL, 1.45 mmol) at 0 C under argon.
The reaction mixture was allowed to warm to 22 C and stirred overnight and then diluted with CH2C12 (100 mL). The organic phase was washed with sat. NaCl (3 x 20 mL), dried (MgSO4), filtered and concentrated under 15 reduced pressure to give a dark oil. Purification by flash chromatography on silica gel eluting with 4:1 hexane:ethyl acetate afforded 4-(4-pyrimidinyl)phenyl trifluoromethanesulfonate a brown oil (210 mg, 48%). MS(ES): 305 (M+H)+, 'H NMR (CDC13) S: 9.31-9.30 (d, J = 1.2 Hz, 1 H), 8.85-8.83 (m, I H), 8.22-8.19 (m, 2 H), 7.73 (m, 1 H), 7.46-7.43 (m, 2 H).
Example 131 20 Synthesis of 4-14-f(2-methyl-1,3-thiazol-4-yl)ethynyl]phenyl}pyrimidine A stirred solution of 4-(4-pyrimidinyl)phenyl trifluoromethanesulfonate from Example 130 (200 mg, 0.66 mmol) in DMF (8 mL) was degassed with argon for 10 min.
PdC12(Ph3P)2 (46 mg, 0.07 mmol), Cul (38 mg, 0.2 mmol), triethylamine (0.23 mL, 1.64 mmol) and n-Bu4NBr 243 mg, 0.66 mmol) were added, followed by 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 25 (169 mg, 0.86 mmol). The reaction mixture was heated at 70 C under argon and then TBAF (1.0 M in THF, 0.86 mL, 0.86 mmol) was added slowly over 20 min. The reaction mixture was allowed to cool to 22 C, then filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel eluting with 1:1 hexane:ethyl acetate to give the cross-coupled product 4-{4-[(2-methyl-1,3-thiazol-4-yl)ethynyl]phenyl}pyrimidine as a yellow 30 solid. This material was treated with 1 M HCI in diethyl ether to afford a yellow solid (130 mg, 51%).
M.P. 190-192 C. MS(ES): 278 (M+H)+, 'H NMR (CD3OD) S: 9.53 (br, 1 H), 9.12 (br, 1 H), 8.57 (m, 1 H), 8.47 (s, 1 H), 8.45 (s, 1 H), 7.92 (s, I H), 7.84 (s, 1H), 7.81 (s, 1 H), 2.81 (s, 3 H).
Example 132 Synthesis of 3-bromo-5-1(2-methyl-1,3-thiazol-4-yl)ethynyllpyridine & 3,5-bisl(2-methyl-1,3-thiazol-4-yl)ethynyll pyridine A solution of 3,5-dibromopyridine (5.1 g, 21.5 mmol) in DMF (100 mL) was degassed with argon for 10 min. PdC12(Ph3P)2 (0.75 g, 1.1 mmol), Cul (0.61 g, 3.2 mmol) and triethylamine (3.7 mL, 26.9 mmol) were added followed by 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (2.1 g, 10.7 mmol). The reaction mixture was heated at 73 C under argon. Then TBAF (1.0 M in THF, 11.8 mL, 11.8 mmol) was added slowly over 20 min. The reaction mixture was allowed to cool to 22 C, filtered through a pad of CeliteTM and the filtrate was concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel eluting with 4:1 hexane:ethyl acetate to give two cross-coupled products: 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine as a white solid (1.7 g, 57%), M.P. 123-124 C, MS(ES): 280 (M+H)+, 'H NMR (CDC13) S: 8.69-8.68 (d, J =
1.7 Hz, 1 H), 8.63-8.23 (d, J = 2.2 Hz, 1 H), 7.99-7.98 (m, 1 H), 7.46 (s, 1 H), 2.76 (s, 3 H) ppm; and 3,5-bis[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine as a yellow solid (160 mg 5 %), M.P.
171-172 C, MS(ES):
322 (M+H)+,'H NMR (CDC13) S: 8.72-8.71 (m, 2 H), 7.95 (m, I H), 7.46 (s, 2 H), 2.76 (s, 6 H).
Example 133 Synthesis of 3-(3-pyridinyl)-5-F(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine hydrochloride A solution of 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 132 (75 mg, 0.27 mmol) in THE (15 mL) was degassed with argon for 10 min. Pd(Ph3P)4 (15 mg, 0.013 mmol), KOH (45 mg, 0.81 mmol) and n-Bu4NBr (43 mg, 0.13 mmol) were added, followed by diethyl(3-pyridyl)borane (51 mg, 0.35 mmol). The reaction mixture was heated at reflux for 5 h under argon, then allowed to cool to 22 C and filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel eluting with 2:1 ethyl acetate:hexane to give 3-(3-pyridinyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine as a brown oil.
This material was treated with 1 M HCl in diethyl ether to yield 3-(3-pyridinyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine hydrochloride as a yellow solid (60 mg, 58%).
M.P. 164-166 C. MS(ES):
278 (M+H)+, 'H NMR (CDC13) S: 8.97 (m, 1 H), 8.90 (d, 1.5 Hz, 1 H), 8.83-8.82 (d, 2.1 Hz, 1 H), 8.80-8.77 (m, 2 H), 8.30 (m, I H), 8.11 (m, 1 H), 7.82 (m, 1 H), 7.52 (s, 1 H), 7.27 (s, 1 H), 2.78 (s, 3 H).
Example 134 Synthesis of 3-(4-pyridinyl)-5-1(2-methyl-1,3-thiazol-4-yl)ethynyllpyridine hydrochloride A solution of 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 132 (48 mg, 0.17 mmol) in 2:1 DME:H2O (30 mL) was degassed with argon for 10 min.
Pd(Ph3P)4 (10 mg, 0.009 mmol), K2CO3 (59 mg, 0.43 mmol) and n-Bu4NBr (48 mg, 0.15 mmol) were added, followed by pyridine-4-boronic acid (32 mg, 0.26 mmol). The reaction mixture was heated at 90 C under argon for 1 h, then allowed to cool to 22 C, filtered through a pad of CeliteTM and the filtrate was concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel eluting with 2:1 ethyl acetate:hexane to give 3-(4-pyridinyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine as a colorless oil. This material was treated with 1 M HCl in diethyl ether to afford 3-(4-pyridinyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine hydrochloride as a yellow solid (20 mg, 30%). M.P. 115-117 C. MS(ES): 278 (M+H)+, 'H NMR (CD3OD) S: 9.48 (br, I H), 9.28 (br, 1 H), 9.18 (s, 1 H), 9.09 (s, 2 H), 8.63 (s, 2 H), 8.08 (s, 1 H), 2.83 (s, 3 H).
Example 135 Synthesis of 5-{5-f(2-methyl-1,3-thiazol-4-vl)ethynyll-3-pyridinyl)pyrimidine hydrochloride A solution of 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 132 (100 mg, 0.36 mmol) in 2:1 DMF:H20 (5 mL) was degassed with argon for 10 min.
Pd(Ph3P)4 (21 mg, 0.018 mmol), K2CO3 (124 mg, 0.9 mmol) and n-Bu4NBr (115 mg, 0.36 mmol) were added, followed by 5-pyrimidinylboronic acid (67 mg, 0.54 mmol). The reaction mixture was heated at 90 C under argon for 1 h, then allowed to cool to 22 C and filtered through a pad of CeliteTM.
The filtrate was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel eluting with 2:1 ethyl acetate:hexane to give 5-{5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-pyridinyl}pyrimidine as a colorless oil. This material was treated with I M
HCl in diethyl ether to afford 5-{5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-pyridinyl}pyrimidine hydrochloride as a yellow solid (20 mg, 30%). M.P. 135-137 C. MS(ES): 279 (M+H)+, 'H NMR (CD3OD) 8: 9.37-8.77 (m, 5 H), 7.97 (m, I H), 7.73 (m, 1 H), 2.78-2.77 (d, J = 1.6 Hz, 3 H).
Example 136 Synthesis of 3-(3,5-dimethyl-4-isoxazolyl)-5-1(2-methyl-1,3-thiazo-4-yl)ethynyllpyridine hydrochloride A solution of 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 132 (100 mg, 0.36 mmol) in 2:1 DMF:H20 (5 mL) was degassed with argon for 10 min.
Pd(Ph3P)4 (21 mg, 0.018 mmol), K2C03 (124 mg, 0.9 mmol) and n-Bu4NBr (115 mg, 0.36 mmol) were added followed by 3,5-dimethyl-4-isoxazolylboronic acid (78 mg, 0.54 mmol). The reaction mixture was heated at 90 C under argon overnight, allowed to cool to 22 C and filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel eluting with 2:1 hexane:ethyl acetate to give 3-(3,5-dimethyl-4-isoxazolyl)-5-[(2-methyl-1,3-thiazo-4-yl)ethynyl]pyridine as a yellow solid. This material was treated with 1 M HCl in diethyl ether to afford 3-(3,5-dimethyl-4-isoxazolyl)-5-[(2-methyl-1,3-thiazo-4-yl)ethynyl]pyridine hydrochloride as a yellow solid (19 mg, 13%). MS(ES): 296 (M+H)+, 'H NMR (CD3OD) S: 9.20-8.81 (m, 3 H), 8.01 (br, 1 H), 2.80 (s, 3 H), 2.58 (s, 3 H), 2.39 (s, 3 H).
Example 137 Synthesis of 3-(4-methoxyphenyl)-5-[ -methyl-1.3-thiazol-4-yl)ethynyflpyridine hydrochloride A solution of 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 132 (100 mg, 0.36 mmol) in 2:1 DMF:H20 (5 mL) was degassed with argon for 10 min.
Pd(Ph3P)4 (21 mg, 0.018 mmol), K2CO3 (124 mg, 0.9 mmol) and n-Bu4NBr (115 mg, 0.36 mmol) were added followed by 4-methoxyphenylboronic acid (82mg, 0.54 mmol). The reaction mixture was heated at 90 C under argon for 1 h, then allowed to cool to 22 C and filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure and the residue was purified by flash chromatography on silica gel eluting with 1:1 hexane:ethyl acetate to give 3-(4-methoxyphenyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine as a yellow solid. This material was treated with 1 M HC1 diethyl ether to afford 3-(4-methoxyphenyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine hydrochloride as a yellow foam (90 mg, 66%). MS(ES): 307 (M+H)+, 'H NMR (CD3OD) S: 9.12 (s, 1 H), 9.00-8.98 (m, 2 H), 7.96 (s, 1 H), 7.84 (s, 1 H), 7.81 (s, 1 H), 7.17 (s, 1 H), 7.14 (s, 1 H), 3.89 (s, 3 H), 2.76 (s, 3 H).
Using the synthetic and purification procedures described in Examples 132 to 137, and using the appropriate reagents, compounds described in Examples 138 to 145 were prepared.
Example 138 3-[(2-Methyl-1,3-thiazol-4-yl)ethynyl]-5-(2-thienyl)pyridine Isolated as an off white solid. M.P 175-176 C. MS(ES): 283 (M+H)+, 'H NMR
(CD3OD) S:
9.16 (br, 1 H), 8.92-8.91 (m, 2 H), 7.96 (s, I H), 7.86-7.84 (m, 1 H), 7.77-7.75 (m, 1 H), 7.28-7.26 (m, 1 H), 2.78 (s, 3 H).
Example 139 3-(2-Furyl)-5-[(2-methyl-1,3-thiazol-4-yl ethynyl]pyridine Isolated as a colorless glass. MS(ES): 267 (M+H)+, 'H NMR (CDC13) S: 8.87 (m, 1 H), 8.64 (m, 1 H), 8.10-8.08 (m, 1 H), 7.54-7.54 (m, 1 H), 7.46 (s, 1 H), 8.78-6.77 (m, 1 H), 6.53 (m, 1 H), 2.76 (s, 3 H).
Example 140 3-[(2-Methyl-1,3-thiazol-4-yl ethynyll-5- 4-(trifluoromethyl,)phenyl]pyridine Isolated as an off-white foam. MS(ES): 267 (M+H)+, 'H NMR (CD3OD) 8: 9.13 (br, 1 H), 9.02 (br, 1 H), 8.85 (br, 1 H), 8.03 (s, 1 H), 8.00 (s, 1 H), 7.91 (s, 2 H), 7.88 (s, 1 H), 2.75 (s, 3 H).
Example 141 3-(1-Benzothien-2-yl)-5-[(2-methyl-1,3-thiazol-4-yl ethynyllpyridine Isolated as an off-white solid. MS(ES): 333 (M+H)+,'H NMR (CD3OD) S: 9.12 (br, 1 H), 8.84 (br, 1 H), 8.70 (s, 1 H), 8.03 (s, 1 H), 7.92-7.90 (m, 3 H), 7.45-7.42 (m, 2 H), 2.76 (s, 3 H).
Example 142 3-(2-Methyl-1,3-thiazol-4-yl)-5-(1H-pyrazol-3-yl)pyridine Isolated as an off-white solid. M.P. 184-186 C, MS(ES): 267 (M+H)+, 'H NMR
(CD3OD) S:
9.28 (s, I H), 9.13 (s, 1 H), 9.01 (s, 1 H), 8.03 (s, 1 H), 7.88-7.87 (d, J =
2.25 Hz, 1 H), 7.07-7.06 (d, J =
2.25 Hz, 1 H), 2.80 (s, 3 H).
Example 143 3-(2,4-Difluorophenyl)-5-(2-methyl-1,3-thiazol-4-yl)pyridine Isolated as a white solid. MS(ES): 313 (M+H)+, 'H NMR (CD3OD) S: 8.87 (br, 2 H), 8.45 (br, 1 H), 7.86 (s, 1 H), 7.72-7.68 (m, 1 H), 7.24-7.16 (m, 2 H), 2.74 (s, 3 H) Example 144 3-(4-Fluorophenyl)-5-(2-methyl-1,3-thiazol-4-yl)pyridine Isolated as a low melting/hygroscopic solid. MS(ES): 295 (M+H)+, 'H NMR
(CD3OD) 6: 9.16 (m, 1 H), 9.06 (m, 1 H), 9.10 (m, 1 H), 7.96 (s, I H), 7.93-7.89 (m, 2 H), 7.39-7.33 (m, 2 H), 2.76 (s, 3 H).
Example 145 3-(2-methyl-1,3-thiazol-4-yl) -5-phenylpyridine Isolated as a hygroscopic solid. MS(ES): 277 (M+H)+, 'H NMR (CD3OD) S: 9.10 (br, 2 H), 8.76 (s, 1 H), 7.90 (s, 1 H), 7.82-7.79 (m, 2 H), 7.60-7.54 (m, 3 H), 2.75 (s, 3 H).
Example 146 Synthesis of 2-fluorocyclohexanone To a stirred solution of (1-cyclohexen-1-yloxy)(trimethyl)silane (3.5 g, 21 mmol) in dry MeCN
(200 mL) under argon was added Selectfluor reagent (8.0 g, 23 mmol). The mixture was stirred at ambient temperature for 3 h, then stored at -20 C overnight, at which time GC/MS showed the reaction to be complete. The mixture was diluted with ethyl acetate (600 mL), washed with dilute brine (300 mL) and then saturated brine (100 mL), dried over Na2SO4, and concentrated in vacuo. The resulting liquid was purified by Kugelrohr distillation (130 C air bath at 20 Ton:) to afford 2-fluorocyclohexanone (1.6 g, 67%) as a clear, colorless oil. 'H NMR (CDCl3, 300 MHz) S 4.90 (ddd, JI )=49.1 Hz, J2=11.3 Hz, J3=6.4 Hz, 1H), 2.61-1.67 (m, 8H). MS (EI
ionization) 116 (M).
Example 147 Synthesis of 2-fluoro-l-1(trimethylsilyl)ethynyllcyclohexanol A solution of n-BuLi (7.6 mL, 2.2M in hexanes, 17 mmol) was added slowly at -40 C to a stirred solution of trimethylsilylacetylene (2.3 mL, 16 mmol) in dry THE (30 mL) under argon. The mixture was stirred at -40 C for 20 min, cooled to -78 C, then a solution of 2-fluorocyclohexanone from Example 146 (1.6 g, 14 mmol) in dry THE (20 mL) was added via syringe.
The mixture was warmed to ambient temperature gradually over 1 h and then stirred at ambient temperature for 4 h.
Analysis of the reaction mixture by GC/MS at this time showed the reaction to be complete. The reaction was quenched by the addition of saturated aqueous NH4C1 (20 mL), stirred for 5 min, then 5 poured into H2O (50 mL), and extracted with ethyl acetate (3 x 30 mL). The combined organic layers were washed with H2O (30 mL), brine (30 mL), dried over Na2SO4, filtered and concentrated in vacuo to afford 2-fluoro-l-[(trimethylsilyl)ethynyl]cyclohexanol (3.4 g, 97%) as a light brown oil as a mixture of diastereomers. 'H NMR (CDC13, 300 MHz) 6 1.89-1.25 (m, 10H), 0.15 (s, 9H).
MS (EI ionization) 214 (M+).
10 Example 148 Synthesis of 2-fluoro-1-(1,3-thiazol-2-ylethynyl)cvclohexanol PdC12 (45 mg, 0.25 mmol) was suspended in DME (20 mL), then argon was bubbled through the solution for several min to deoxygenate it. H2O (6.6 mL), K2C03 (4.5 g, 32 mmol), CH3OH (20 mL), 2-bromo-1,3-thiazole (2.63 g, 16.1 mmol), PPh 3 (280 mg, 1.07 mmol) and Cul (204 mg, 15 1.07mmol) were then added and the reaction mixture was heated to 50 C.
After a few min 2-fluoro-l-[(trimethylsilyl)ethynyl]cyclohexanol from Example 147 (2.3 g, 11 mmol) was added to the dark brown suspension. The reaction was then heated to 60 C and after 16 h at 60 C, GC/MS
showed no remaining 2-bromo-1,3-thiazole. The reaction mixture was concentrated in vacuo, diluted with ethyl acetate (200 mL), and filtered through CeliteTM. The filter pad was then thoroughly washed with ethyl acetate and 20 the combined filtrates were washed with H2O (200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel on silica gel eluting with hexane, 9:1, then 7.5:2.5 hexane:ethyl acetate to afford 2-fluoro-l-(1,3-thiazol-2-ylethynyl)cyclohexanol (1.1 g, 45%) as a yellowish solid, and a 5:1 mixture of diastereomers. 'H NMR
(CDC13, 300 MHz) S 7.83 (d, J=3 Hz, 1H), 7.37 (d, J=3 Hz, 1H), 4.80-4.33 (m, 1H), 3.06 (s, 1H), 2.21-25 1.23 (m, 6H). MS (EI ionization) 225 (M+).
Example 149 Synthesis of 3-ethoxy-5-methyl-2-cyclohexen-l-one A solution of 5-methyl-1,3-cyclohexanedione (9.83 g, 77.9 mmol) and TsOH=H20 (636 mg, 6 wt.%) in ethanol (80 mL) was heated to reflux. After 15 min, triethyl orthoformate (5 mL, 30 mmol) 30 was added. After 10min TLC showed the reaction was incomplete, and additional triethyl orthoformate (5 mL, 30 mmol) was added. After a further 10 min GC/MS showed the reaction to be complete. The reaction mixture was concentrated in vacuo, then diluted with diethylether (300 mL) and washed with NaHCO3, H2O (300 mL), brine (2 x 300 mL), dried over Na2SO4i and filtered. The filtrate was concentrated in vacuo, to afford 3-ethoxy-5-methyl-2-cyclohexen-l-one as an yellowish-orange oil (11.04 g, 92%).'H NMR (CDC13i 300MHz) S 5.34 (s, 1H), 3.94-3.86 (m, 2H), 2.44-1.95 (m, 6H), 1.36 (t, J=7 Hz, 3H), 1.08 (d, J=6 Hz, 3H). MS (El ionization) 154 (M+).
Example 150 Synthesis of 5-methyl-3-(2-pyridinylethynyl)-2-cyclohexen-l-one A solution of n-BuLi (8 mL, 2.2M in hexanes, 18 mmol) was added slowly at 0 C
to a stirred solution of diisopropylamine (2.8 mL, 19 mmol) in dry THE (20 mL) under argon.
The mixture was stirred at 0 C for 30 min then a solution of 2-ethynylpyridine (2.27 g, 22.0 mmol) in dry THE (20 mL) was added via syringe. The mixture was stirred at 0 C for 1 h, then 5-methyl-3-ethoxy-2-cyclohexene-1-one from Example 149 (2.0 g, 13 mmol) was added. After stirring for 16 h at ambient temperature GCIMS showed the reaction was complete. The reaction mixture was quenched by the addition of saturated aqueous NH4Cl (100 mL), stirred for 5 min and poured into H2O (50 mL), and extracted with ethyl acetate (3 x 100 mL). The combined organic layers were washed with H2O
(100 mL), brine (100 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The crude material was purified by column chromatography on silica gel eluting with hexane, 9:1, 4:1, then 7:3 hexane:ethyl acetate to afford 5-methyl-3 -(2-pyridinylethynyl)-2-cyclohexen- 1-one (1.0 g, 36%) as a light green solid. M.p.=
62.5-65 C. ' H NMR (CDC13, 300 MHz) S 8.64 (d, J=6 Hz, 1H), 7.74-7.68 (m, 1H), 7.51 (d, J=9 Hz, 1H), 7.32-7.26 (m, 1H), 6.37 (s, 1H), 2.67-2.50 (m, 2H), 2.33-2.09 (m, 3 H), 1.11 (d, 3H). MS (ESI) 212.0 (M++H).
Example 151 Synthesis of 3-ethoxy-5.5-dimethyl-2-cvclohexen-l-one To a solution of 5,5-dimethyl-1,3-cyclohexanedione (25.2 g, 180 mmol) in ethanol (200 mL), was added TsOH= H2O (1.06 g, 4.2 wt%), then triethyl orthoformate (30 mL, 180 mmol). The resulting pale yellow solution was then heated to reflux. After heating for 15 min the solution had turned bright orange. GCIMS analysis of the reaction after 1 h showed no starting material present. The orange-brown solution was concentrated in vacuo, diluted with ethyl acetate (300 mL), washed with saturated aqueous NaHCO3 (2 x 75 mL), brine (150 mL), dried over Na2SO4, filtered and concentrated in vacuo to afford an orange semi-solid. The crude product was purified by column chromatography on silica gel eluting with hexane, then 3:1 hexane:ethyl acetate to afford 3-ethoxy-5,5-dimethyl-2-cyclohexen-I -one (13.5 g, 44%) as an orange oil that slowly solidified. ' H NMR (CDC13, 300 MHz) S 5.34 (s, 1H), 3.90 (q, J=7.0 Hz, 2H), 2.28 (s, 1H), 2.21 (s, 1H), 1.37 (t, J=7.0 Hz, 3H), 1.08 (s, 6H). MS (El ionization) 168 (M+).
Example 152 Synthesis of 5,5-dimethyl-3-(2-pyridinylethynyl)-2-cyclohexen-l-one A solution of n-BuLi (7.0 mL, 2.2M in hexanes, 15 mmol) was added slowly at 0 C to a stirred solution of diisopropylamine (2.5 mL, 18 mmol) in dry THE (20 mL) under argon.
The mixture was stirred at 0 C for 30 min then a solution of 2-ethynylpyridine (2.1 g, 20mmol) in dry THE (20 mL) was added via syringe. The mixture was stirred at 0 C for 1 h then 3-ethoxy-5,5-dimethyl-2-cyclohexen-l-one from Example 151 (2.0 g, 12 mmol) was added and the reaction mixture was allowed to warm to ambient temperature. After 16 h at ambient temperature GC/MS showed the reaction to be complete.
The reaction was quenched by the addition of saturated aqueous NH4C1 (100 mL).
After 5 min the reaction was poured into H2O (50 mL), and extracted with ethyl acetate (3 x 100 mL). The combined organic layers were washed with H2O (100 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. The crude material was purified by column chromatography on silica gel eluting with hexane, 9:1, then 4:1 hexane:ethyl acetate to afford 5,5-dimethyl-3-(2-pyridinylethynyl)-2-cyclohexen-l-one (0.563 g, 12%) as a red oil.' H NMR (CDC13, 300 MHz) S 8.64 (d, J=6 Hz, 1H), 7.72-7.71 (m, I H), 7.51 (d, J=6 Hz, 111), 7.28-7.27 (m, 111), 6.38 (s, 1H), 2.47 (s, 2H), 2.31 (s, 2H), 1.09 (s, 6H). MS (ESI) 226.1 (M++H).
Example 153 Synthesis of 2-[(trimethylsilyl)ethynyllbicyclo[2.2.llheptan-2-ol A solution of n-BuLi (46 mL of a 2.2M solution in hexanes, 100 mmol) was added slowly at -78 C to a stirred solution of trimethylsilylacetylene (10 g, 100 mmol) in dry THE (100 mL) under argon. The mixture was stirred at -78 C for 30 min, then a solution of bicyclo[2.2.1]heptan-2-one (norcamphor) (7.7 g, 70 mmol) in dry THE (70 mL) was added via syringe. The mixture was allowed to reach ambient temperature gradually and stirred for 1.5 hr, at which time GC/MS showed the reaction to be complete. The reaction was quenched by the addition of saturated aqueous NH4C1 (300 mL), the mixture was stirred for 5 min and poured into H20(100 mL), and extracted with ethyl acetate (3 x 300 mL). The combined organic layers were washed with H2O (100 mL), brine (100 mL), dried over Na2SO4, and filtered. The crude material was purified by column chromatography on silica gel eluting with hexane, then 20:1 hexane:ethyl acetate to afford 2-[(trimethylsilyl)ethynyl]bicyclo[2.2.1]heptan-2-ol (10 g, 47%) as a red oil. 'H NMR (CDC13, 300 MHz) S 2.06-1.31 (m, 11H), 0.16 (s, 9H). MS (El ionization) 207.
Example 154 Synthesis of 2-(1.3-thiazol-2-ylethynyl)bicyclo[2.2.llheptan-2-ol PdC12 (27 mg, 0.15mmol) was suspended in DME (20 mL), then argon was bubbled through the solution for several min to deoxygenate it. H20(1 0 mL), K2CO3 (2.5 g, 18 mmol), CH30H (20 mL), 2-bromo-1,3-thiazole (1.0 g, 6.1 mmol), PPh 3 (160 mg, 0.61 mmol) and Cul (118 mg, 0.61 mmol) were added and the reaction was heated to 50 C. After a few min 2-[(trimethylsilyl)ethynyl]-bicyclo[2.2.1]heptan-2-ol from Example 153 (1.3 g, 6.1 mmol) was added to the dark brown suspension. The reaction was heated to 60 C and allowed to stir for 16 h, at which time GC/MS showed no remaining 2-bromo-1,3-thiazole. The reaction mixture was diluted with ethyl acetate (200 mL), and filtered through CeliteTM. The filter pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with H2O (200 mL), brine (200 mL), dried over Na2SO4i and filtered.
The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, 9:1, then 4:1 hexane:ethyl acetate to afford 2-(1,3-thiazol-2-ylethynyl)bicyclo[2.2.1]heptan-2-ol (550 mg, 42%) as a red oil. 1H NMR (CDC13, 300 MHz) S 7.79 (d, J=3 Hz, 1H), 7.34 (d, J=3 Hz, 1H), 2.55-1.26 (m, 1IH). MS (EI ionization) 219.
Example 155 Synthesis of 2-(bicyclol2.2.1lhept-2-en-2-ylethynyl)-1,3-thiazole To a solution of 2-(1,3-thiazol-2-ylethynyl)bicyclo[2.2.1]heptan-2-ol from Example 154 (300 mg, 1.37 mmol) in CH2C12 (20 mL) under argon, was added a catalytic amount of 4-(dimethylamino)-pyridine, and triethylamine (0.57 mL, 4.1 mmol). After 2 min methanesulfonyl chloride (0.16 mL, 2.0 mmol) was added. After 1 h GC/MS showed the reaction to be complete. The mixture was diluted with ethyl acetate (200 mL), and washed with NaHCO3 (200 mL), H2O (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, then 98:2 hexane:ethyl acetate to afford 2-(bicyclo[2.2.I]hept-2-en-2-ylethynyl)-1,3-thiazole (203 mg, 74%) as a red oil.
1H NMR (CDC13, 300 MHz) S 7.81 (d, J=3 Hz, I H), 7.33 (d, J=3 Hz, I H), 6.55 (d, J=3 Hz, I H), 3.09 (s, I H), 2.99 (d, J=1.2 Hz, 1H) 1.81-1.67 (m, 2 H), 1.53 (d, J=8.5 Hz, 1H), 1.25-1.09 (m, 3H). MS
(ESI) 202.1 (M++H).
Example 156 Synthesis of 1-f(6-methyl-2-pyridinyl)ethynyllcyclopentanol PdC12(PPh3)2 (320 mg, 0.45 mmol) was suspended in DME (20 mL) then argon was bubbled through the solution for several min to deoxygenate it. 2-Bromo-6-methylpyridine (1.9 g, 11 mmol), triethylamine (6.3 mL, 45 mmol) and Cul (170 mg, 0.91 mmol) were added and the reaction was heated to 50 C. After a few min 1-ethynyl cyclopentanol (1.0 g, 9.1 mmol) was added to the dark brown suspension. The reaction was heated to 60 C, and after 16 h at 60 C GC/MS and TLC analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (200 mL), and filtered through CeliteTM. The filter pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with H2O (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, 9:1, 8:2, then 7:3 hexane:ethyl acetate to afford 1-[(6-methyl-2-pyridinyl)ethynyl]cyclo-pentanol (1.2 g, 57%) as a yellow solid. MS (EI ionization) 201 (M).
Example 157 Synthesis of 2-(1-cvclopenten-l-vlethynyl)-6-methylpyridine To a solution of 1-[(6-methyl-2-pyridinyl)ethynyl]cyclopentanol from Example 156 (190 mg, 1.0 mmol) in CH2C12 (10 mL) under argon was added phosphorus pentoxide (355 mg, 2.5 mmol). The mixture was allowed to stir at ambient temperature for 16 h at which time TLC
showed the reaction to be complete. The reaction was quenched by the addition of saturated aqueous Na2CO3 solution (to basic pH), stirred for 5 min, and extracted with ethyl acetate (3 x 100 mL). The combined organic layers were washed with H2O (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo.
The crude material was purified by column chromatography on silica gel eluting with hexane, then 9:1 hexane:ethyl acetate to afford 2-(1-cyclopenten-1-ylethynyl)-6-methylpyridine (110 mg, 63%) as a yellow solid. 1 H NMR (CDC13, 300 MHz) S 7.54-7.48 (m, 1H), 7.25-7.23 (m, 1H) 7.07-7.03 (m, 1H), 6.25-6.23 (m, 1H), 2.60-2.43 (m, 7H), 1.99-1.90 (m, 2H). MS (ESI) 184.1 (M++H).
Example 158 Synthesis of Racemic 2-{l(cis)-3,4-dimethyl-l-cvclopenten-l-vllethynyl}pyridine A solution of n-BuLi (16.8 mL of a 2.5M solution in hexanes, 42.0 mmol) was added gradually at 0 C to a stirred solution of diisopropylamine (5.9 mL, 42 mmol) in dry THE
(40 mL) under argon.
The mixture was stirred at 0 C for 30 min then cooled to -78 C and a solution of cis-3,4-dimethylcyclopentanone [Mori, K., Ueda, H.; Tetrahedron, (1982), pp 1227-1233]
(3.6 g, 32 mmol) in dry THE (20 mL) was added via syringe. After the mixture stirred at -78 C for 1 h a solution of N-phenyltrifluoromethanesulfonimide (13.8 g, 38.6 mmol) in dry THE (40 mL) was added via syringe during 15 min. The reaction was allowed to warm gradually to ambient temperature, and after stirring for 16 h at ambient temperature GC/MS showed no remaining cis-3,4-dimethylcyclopentanone. The reaction was quenched with NaHCO3 (2mL), DME (30 mL) was added, and argon was bubbled through the solution for several min to deoxygenate it. To the resulting solution of racemic (cis)-3,4-dimethyl-l-cyclopenten-1-yl trifluoromethanesulfonate PdC12(PPh3)2 (1.1 g, 1.6 mmol), triethylamine (22 mL, 160 mmol), Cul (1.2 g, 6.4 mmol), Ph3P (0.50 g, 1.9 mmol), and 2-ethynylpyridine (4.0 g, 38 mmol) were added, and the reaction was heated to 50 C. After stirring for 16 h at 50 C, TLC analysis showed no remaining racemic (cis)-3,4-dimethyl-l-cyclopenten-1-yl trifluoromethanesulfonate. The mixture was diluted with ethyl acetate (400 mL), and filtered through a CeliteTM pad. The filter pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with H2O (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, then 96:4 hexane:ethyl acetate to afford racemic 2-{[(cis)-3,4-dimethyl-l-cyclopenten-1-yl]ethynyl}pyridine (4.6 g, 73%) as a light brown oil. 1 H NMR (CDC13, 300 MHz) S 7.58-8.56 (m, 1H), 7.66-7.60 (m, 1H) 7.42 (d, J=9 Hz, 1H), 7.22-7.17 (m, 1H), 6.18-6.15 (m, 1H), 2.82-2.11 (m, 4H), 0.98-0.91 (m, 6H). MS
(ESI) 198.1 (M++H).
Example 159 Synthesis of 2-{1(3S,4R)-3,4-dimethyl-l-cyclopenten-l-yllethynyl}pyridine A solution of n-BuLi (6.7 mL of a 2.5M solution in hexanes, 17 mmol) was added slowly to a stirred solution of diisopropylamine (2.4 mL, 17 mmol) in dry THE (20 mL) at 0 C under argon. The 5 mixture was stirred at 0 C for 30 min then cooled to -78 C and a solution of (3S,4S)-3,4-dimethylcyclopentanone [Kokke, W. C. M. C., Varkevisser, F. A.; J. Org. Chem.
(1974), pp 1535-1539;
Heathcock, C. H., Davis, B. R., Hadley, C. R.; J. Med. Chem. (1989), pp 197-202) (1.45 g, 13.0 mmol]
in dry THE (10 mL) was added via syringe. After the mixture was stirred at -78 C for I h, a solution of N-phenyltrifluoromethanesulfonimide (5.5 g, l6mmol) in dry THE (20 mL) was added via syringe 10 during 15 min. The reaction was stirred and allowed to gradually warm to ambient temperature. After stirring for 16 h, GC/MS showed no remaining (3S,4S)-3,4-dimethylcyclopentanone. The reaction was quenched with saturated aqueous NaHCO3 (1 mL), DME (15 mL) was added, then argon was bubbled through the solution for several min to deoxygenate it. To the resulting solution of (3R,4S)-3,4-dimethyl-1-cyclopenten-1-yl trifluoromethanesulfonate PdC12(PPh3)2 (460 mg, 0.65 mmol), 15 triethylamine (9.0 mL, 65 mmol), Cul (0.50 g, 2.6 mmol), Ph3P (0.46 g, 0.65 mmol), and 2-ethynylpyridine (1.3 g, 13 mmol) were added and the reaction was heated to 50 C. After stirring for 16 h at 50 C, TLC showed no remaining (3R,4S)-3,4-dimethyl-l-cyclopenten-1-yl trifluoromethane-sulfonate. The mixture was diluted with ethyl acetate (200 mL), and filtered through CeliteTM. The filter pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with H2O
20 (200 mL), brine (200 mL), dried over Na2SO4i and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, then 98:2, then 96:4 hexane:ethyl acetate to afford 2-{[(3S,4R)-3,4-dimethyl-l-cyclopenten-1-yl]ethynyl}pyridine (1.5 g, 64%) as a yellow oil. 'H NMR (CDC13, 300 MHz) S 8.57 (m, 1H), 7.66-7.60 (m, 1H) 7.41 (d, J=9 Hz, 1H), 7.21-7.18 (m, 1H), 6.09 (d, J=3 Hz, IH), 2.74-1.85 (m, 4H), 1.09-1.04 (m, 6H). MS (ESI) 25 198.1 (M++H).
Example 160 Synthesis of Racemic 2-{1(trans)-3,4-dimethyl-l-cyclopenten-1-yllethynyl}pyridine A cis-trans mixture of 2-[(3,4-dimethyl-l-cyclopenten-1-yl)ethynyl]pyridine was separated by preparative reverse phase HPLC (Zorbax SB-C18 15cm x 21 mm x 5 m dp; Mobile phase A: 100:0.1 30 H20:TFA, Mobile phase B: 100:0.1 acetonitrile:TFA; 30% B at 20 mL/min.) The resulting trifluoroacetic acid salt of the trans isomer was suspended in aqueous K2CO3 and the resulting aqueous suspension was extracted with ethyl acetate. The aqueous layer was then saturated with solid NaCl and extracted with ethyl acetate (5 x 100 mL). The combined extracts were dried over Na2SO4, filtered, and concentrated in vacuo to afford a brown oil. The dark product was further purified by column 35 chromatography on silica gel eluting with 6:1 then 4:1 hexane:ethyl acetate to afford racemic 2-{[(trans)-3,4-dimethyl-l-cyclopenten-1-yl]ethynyl}pyridine (155.3 mg) as a pale yellow oil. 'H NMR
(CDC13, 300 MHz) S 8.58-8.56 (m, 1H), 7.66-7.59 (m, 1H), 7.43-7.40 (m, 1H), 7.22-7.16 (m, 1H), 6.12-6.10 (m, I H), 2.79-2.71 (m, 1H), 2.42-2.35 (m, I H), 2.25-2.16 (m, I H), 1.91-1.85 (m, I H), 1.07 (t, J=7.0 Hz, 6H). MS (ESI) 198.1 (M++H).
Example 161 Synthesis of 2-methyl-4-(1,3-thiazol-2-vlethynyl)-1,3-thiazole Cul (50 mg, 0.26 mmol), PdC12(PPh3)2 (93 mg, 0.13 mmol), PPh3 (70 mg, 0.26 mmol), and tetrabutylammonium iodide (377 mg, 1.02 mmol) were combined in dry DMF (20 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (0.8 mL, 5 mmol), was added, and the reaction mixture was warmed to 40 C, then a solution of 2-bromo-1,3-thiazole (218 mg, 1.32 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (200 mg, 1.02 mmol) in DMF (10 mL) added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.3 mL of a 1.OM solution in THF, 1.3 mmol) was added by syringe pump over 1 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (30 mL), filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 9:1, 4:1, then 3:1 hexane:ethyl acetate to afford 2-methyl-4-(1,3-thiazol-2-ylethynyl)-1,3-thiazole (165 mg, 78%) as a brown solid. M.p.= 57-58 C. 'H
NMR (CDC13, 300 MHz) S 7.88 (d, J=3.0 Hz, IH), 7.55 (s, 1H), 7.41 (d, J=3.0 Hz, 1H), 2.76 (s, 3H).
MS (ESI) 207.0 (M++H).
Example 162 Synthesis of 4-(3-pyridinylethynyl)-1,3-thiazol-2-amine Cul (51 mg, 0.26 mmol), PdC12(PPh3)2 (93 mg, 0.13 mmol), PPh3 (70 mg, 0.26 mmol), tetrabutylammonium iodide (377 mg, 1.02 mmol) were combined in dry DMF (20 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (0.8 mL, 5 mmol), was added, the reaction mixture was warmed to 40 C, then a solution of 3-bromopyridine (210 mg, 1.32 mmol) and 4-[(trimethylsilyl)ethynyl]-1,3-thiazol-2-ylamine from Example 78 (200 mg, 1.02 mmol) in DMF (10 mL) added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.3 mL of a 1.OM solution in THF, 1.3 mmol) was added by syringe pump over 1 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (30 mL), filtered through CeliteTM, and the filter pad washed thoroughly with ethyl acetate.
The combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 4:1, 1:1, then 1:4 hexane:ethyl acetate. The product was further purified by recrystallization from hot CHC13 to afford 4-(3-pyridinylethynyl)-1,3-thiazol-2-amine (90 mg, 43%) as a brown solid. M.p.= 165-170 C. 'H NMR (CDC13, 300 MHz) S 8.65 (s, 11-1), 8.50 (d, J=6.0 Hz, 1H), 7.95-7.92, (m, 1 H), 7.47-7.44 (m, 111), 6.93 (s, 11-1). MS (EI ionization) 201.0 (M).
Example 163 Synthesis of 4-f(2-methyl-l,3-thiazol-4-vl)ethynyllisothiazole CuI (60.0 mg, 0.31 mmol), PdC12(PPh3)2 (109 mg, 0.15 mmol), PPh3 (82 mg, 0.31 mmol), and tetrabutylammonium iodide (440 mg, 1.2 mmol) were combined in dry DMF (20 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (0.8 mL, 5 mmol), was added, and the reaction mixture was warmed to 40 C, then a solution of 4-bromoisothiazole (200 mg, 1.2 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (360 mg, 1.8 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.6 mL of a 1.OM solution in THF, 1.6 mmol) was added by syringe pump over 1 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (30 mL) and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 9:1, then 4:1 hexane:ethyl acetate to afford 4-[(2-methyl-1,3-thiazol-4-yl)ethynyl]isothiazole (140 mg, 37%) as a yellow solid.
M.p.= 113-114 C. 'H
NMR (CDC13, 300 MHz) 8 8.79 (s, 11-1), 8.61 (s, 1H), 7.41 (s, 1H), 2.75 (s, 3H). MS (ESI) 207.0 (M++H).
Example 164 Synthesis of 2-methyl-4-(1,3-thiazol-4-ylethynyl)-1,3-thiazole Cul (60 mg, 0.31 mmol), PdC12(PPh3)2 (110 mg, 0.15 mmol), PPh3 (82 mg, 0.31 mmol), and tetrabutylammonium iodide (440 mg, 1.2 mmol) were combined in dry DMF (20 mL), and argon gas was bubbled through the suspension for several min to deoxygenate it.
Triethylamine (0.8 mL, 5 mmol), was added, the reaction mixture was warmed to 40 C, then a solution of 4-bromo-1,3-thiazole (200 mg, 1.2 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (360 mg, 1.8 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.6 mL of a 1.OM solution in THF, 1.6 mmol) was added via syringe pump over 1 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (30 mL) and filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 9:1, 4:1, then 3:1 hexane:ethyl acetate to afford 2-methyl-4-(1,3-thiazol-4-ylethynyl)-1,3-thiazole (112 mg, 30%) as a yellow solid. M.p.= 102-103 C. 'H
NMR (CDC13, 300 MHz) 8 8.82 (d, J=2 Hz, 1H), 7.64 (d, J=2 Hz, 1H), 7.46 (s, 1H), 2.75 (s, 3H). MS
(ESI) 207.0 (M++H).
Example 165 Synthesis of 5-f(2-methyl-1,3-thiazol-4-yl)ethynyllisothiazole Cu! (60 mg, 0.31 mmol), PdC12(PPh3)2 (110 mg, 0.15 mmol), PPh3 (82 mg, 0.31 mmol), and tetrabutylammonium iodide (440 mg, 1.2 mmol) were combined in dry DMF (20 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (0.8 mL, 5 mmol), was added, and the reaction mixture was warmed to 40 C, then a solution of 5-bromoisothiazole (200 mg, 1.2 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (360 mg, 1.8 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.6 mL of a 1.OM solution in THF, 1.6 mmol) was added by syringe pump over 1 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (30 mL) and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 9:1, then 4:1 hexane:ethyl acetate to afford 5-[(2-methyl-1,3-thiazol-4-yl)ethynyljisothiazole (160 mg, 42%) as a yellow solid.
M.p.= 79-80 C. 'H NMR
(CDC13, 300 MHz) S 8.46 (d, J=2 Hz, 1H), 7.48 (s, 1H), 7.39, (d, J=2 Hz, 1H), 2.75 (s, 3H). MS (ESI) 207.0 (M}+H).
Example 166 Synthesis of 2-(11.1'-biphenyll-4-ylethynyl)pyrimidine Cut (84 mg, 0.44 mmol), PdC12(PPh3)2 (155 mg, 0.22 mmol), PPh3 (110 mg, 0.44 mmol), and tetrabutylammonium iodide (630 mg, 1.7 mmol) were combined in dry DMF (25 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (I mL, 8 mmol), was added, and the reaction mixture was warmed to 40 C, then a solution of 4-bromobiphenyl (515 mg, 2.2 mmol) and 2-[(trimethylsilyl)ethynyl]pyrimidine from Example 81 (300 mg, 1.7 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (2.2 mL of a 1.OM
solution in THF, 2.2 mmol) was added by syringe pump over 2 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (50 ;0 mL) and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 9:1, then 8.5:1.5 hexane:ethyl acetate to afford 2-([1,l'-biphenyl]-4-ylethynyl)pyrimidine (200 mg, 46%) as a yellow solid. The product was dissolved in diethyl ether (20 mL) and HCI in diethyl 5 ether (12 mL of a 1.OM solution, 12 mmol) was added to afford a light yellow precipitate. The precipitate was filtered, and dried in vacuo to afford 2-([1,1'-biphenyl]-4-ylethynyl)pyrimidine hydrochloride (170 mg, 34%) as a yellow solid. M.p.= 135-137 C. 'H NMR (CDC13, 300 MHz) S 9.01 (d, J=6 Hz, 2H), 7.76-7.66 (m, 7H), 7.49-7.39, (m, 3H). MS (ESI) 257.0 (M+H).
Example 167 Synthesis of N'-f3-12-(2-pyridinyl)ethvnvll-2-cvclohexen-l-ylidene}-2-furohydrazide A solution of 2-furohydrazide (61 mg, 0.48 mmol) in ethanol (1 mL) was treated with acetic acid (1 drop), and 3-(2-pyridinylethynyl)-2-cyclohexen-l-one from Example 104 (86 mg, 0.44 mmol) was added as a solution in ethanol (1 mL) followed by a rinse of the flask and syringe (0.5 mL). The resulting solution was then heated in a 90 C oil bath for 45 min. The reaction solution was cooled to ambient temperature and concentrated in vacuo to afford an orange oil. The crude oil was adsorbed onto silica gel and purified by column chromatography on silica gel eluting with 40:1 CHC13:CH3OH to afford N'-{3-[2-(2-pyridinyl)ethynyl]-2-cyclohexen-1-ylidene}-2-furohydrazide (40.2 mg, 30%) as a yellow oil. The material appeared to be one component by LC/MS analysis, but showed some extra peaks in the NMR spectra possibly caused by a mixture of double bond isomers being present. 'H NMR
(CDC13, 300 MHz) S 9.56 (br s, 0.1 H), 9.33 (br s, 0.9H), 8.60 (d, 1H, J=4.7 Hz), 7.68 (t, 1H, J=8.6 Hz), 7.55-7.43 (m, 2H), 7.35-7.20 (m, 214), 6.96 (br s, 0.1H), 6.86 (br s, 0.9H), 6.56 (dd, J=1.6, 3.5 Hz, 1H), 2.67-2.62 (m, O.1H), 2.56-2.40 (m, 3.81), 2.26 (br s, 0.2H), 2.03-1.93 (m, 1.8H). MS (ESI) 306.1 (M++H).
Example 168 Synthesis of N-f4-12-(1-cvclohexen-1-vl)ethvnvll-1.3-thiazol-2-yl}benzamide To a suspension of 4-(1-cyclohexen-1-ylethynyl)-1,3-thiazol-2-ylamine tosylate from Example 41 (65 mg, 0.17 mmol) in THE (2.0 mL) was added triethylamine (0.10 mL, 0.72 mmol) to afford a yellow solution. Benzoyl chloride (40 L, 0.34 mmol) was then added to afford a suspension. After stirring for 16 h at ambient temperature, TLC and LC/MS analysis showed starting amine present. The reaction mixture was then heated in a 50 C oil bath. After 3 h at 50 C, TLC
and LC/MS analysis showed little progress in the reaction. Additional benzoyl chloride (50 L, 0.43 mmol) was added to the reaction. After stirring for 26 h after the addition of the second portion of benzoyl chloride the reaction was cooled to ambient temperature, quenched by the addition of saturated aqueous NaHCO3 (10 mL), and diluted with ethyl acetate (30 mL). The aqueous layer was extracted with ethyl acetate (2 x 10 mL), the combined organics were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo.
The crude product was purified by column chromatography on silica gel eluting with 12:1 then 10:1 hexane:ethyl acetate to afford N-{4-[2-(1-cyclohexen-1-yl)ethynyl]-1,3-thiazol-2-yl}benzamide (37 mg, 70 %) as an oil that partially solidified under high vacuum. The material was not completely pure by NMR analysis, and was then carefully purified by column chromatography on silica gel eluting with 15:1 then 12:1 hexane:ethyl acetate to afford N-{4-[2-(1-cyclohexen-1-yl)ethynyl]-1,3-thiazol-2-yl}benzamide (30 mg, 57%) as a white foam. 'H NMR (CDC13, 300 MHz) S 7.98 (d, J=7.3 Hz, 2H), 7.58 (t, J=7.3 Hz, 1H), 7.46 (t, J=7.8 Hz, 2H), 7.09 (s, 1H), 5.92-5.80 (m, 1H), 2.05-2.00 (m, 2H), 1.95-1.87 (m, 2H), 1.59-1.49 (m, 2H). MS (ESI) 309.1 (M++H), 331.0 (M++Na).
Example 169 Synthesis of 3-1(2-methyl-1,3-thiazol-4-vl)ethynyllpyridine PdCI2 (15 mg, 85 mol), and Cul (23 mg, 120 mol) were combined in DME (3 mL) under argon. H2O (1 mL) was added and argon was bubbled through the resulting dark suspension while it was warmed to 40 C in an oil bath. Triphenylphosphine (84 mg, 320 mol) was added and the argon flow was continued for 10 min. The argon flow was discontinued, solid potassium carbonate (277 mg, 2.0 mmol) was added, followed by 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (90 mg, 0.46 mmol) and 3-bromopyridine (56 pL, 0.58 mmol) as a solution in DME
(2 mL) followed by a rinse of the flask and syringe with DME (1 mL). The temperature was raised to 75 C. After 16 h there was still 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole visible by GC/MS analysis. At this time Bu4NF (1.0 mL of a 1.OM solution in THF, 1.0 mmol) was added to the reaction mixture. After 10 min GC/MS analysis showed the reaction was complete. The reaction mixture was cooled to ambient temperature, diluted with ethyl acetate (50 mL), and H2O (10 mL). The aqueous layer was extracted with ethyl acetate (2 x 10 mL), the combined organics were washed with brine (20 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 2:1, 1:1, then 2:3 hexane:ethyl acetate to afford product contaminated with some close-running impurities. The material was then carefully purified by column chromatography on silica gel eluting with 2:1, then 1:1 hexane:ethyl acetate to afford 3-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (48.6 mg, 52 %) as a pale brown oil that partially solidified after pumping down under high vacuum. M.p.= 75-76 C. 'H NMR (CDC13, 300 MHz) 8 9.0-8.7 (br s, 1H), 8.7-8.45 (br s, IH), 7.84 (d, J=7.9 Hz, 1H), 7.45 (s, 1H), 7.35-7.22 (m, 1H), 2.75 (s, 1H). MS (EI ionization) 200 (M+).
Example 170 Synthesis of 2,4-dimethyl-6-I(trimethylsilyl)ethynyllpyrimidine A solution of trifluoromethanesulfonic anhydride (6.5 mL, 39 mmol) was added slowly to a stirred solution of 2,4-dimethyl-6-hydroxypyrimidine (4.0 g, 32 mmol) and triethylamine (7.5 mL, 53 mmol) in dry CH2CI2 (125 mL) at 0 C under argon. The mixture was stirred at ambient temperature for 16 h at which time TLC analysis showed the reaction to be complete. The mixture was diluted with CH2C12 (200 mL), washed with saturated aqueous NaHCO3 (200 mL), brine (200 mL), dried over Na2SO4, filtered and concentrated in vacuo. Half of the residue (4 g, 16 mmol) was dissolved in DME
(10 mL), and argon was bubbled through the solution for several min to deoxygenate it.
Trimethylsilylacetylene (2.9 g, 30 mmol) was added. The resulting solution was added to a deoxygenated mixture of PdC12 (83 mg, 0.47 mmol), triethylamine (8.7 mL, 1.8 mmol), Cu! (259 mg, 1.35 mmol), and triphenylphosphine (483 mg, 1.84 mmol), in DME (20 mL) at 45 C. After stirring for 16 h at 45 C, TLC showed no remaining 2,6-dimethyl-4-pyrimidinyl trifluoromethanesulfonate. The mixture was diluted with ethyl acetate (200 mL), and filtered through CeliteTM. The filter pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with H2O (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, 20:1, then 9:1 hexane:ethyl acetate to afford 2,4-dimethyl-6-[(trimethylsilyl)ethynyl]pyrimidine (600 mg, 18%) as a yellow oil. 1 H
NMR (CDC13, 300 MHz) S 7.10 (s, 1H), 2.69 (s, 1H), 2.48 (s, 1H), 0.26 (s, 9H).
Example 171 Synthesis of 4-(11,1'-biphenyll-4-ylethynyl)-2,6-dimethylpyrimidine CuI (73 mg, 0.38 mmol), PdC12(PPh3)2 (130 mg, 0.19 mmol), triphenylphosphine (100 mg, 0.38 mmol), and tetrabutylammonium iodide (543 mg, 1.47 mmol) were combined in dry DMF (25 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (1.0 mL, 7.4 mmol), was added, the reaction mixture was warmed to 40 C, and a solution of 4-bromo-1,1'-biphenyl (446 mg, 1.9 mmol) and 2,4-dimethyl-6-[(trimethylsilyl)ethynyl]pyrimidine from Example 170 (300 mg, 1.47 mmol) in DMF (10 mL) was added. The reaction mixture was warmed to 70 C and tetrabutylammonium fluoride (1.9 mL of a 1.0 M solution in THF, 1.3 mmol) was added by syringe pump over 2 h. After stirring for an additional 2 h, TLC and GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (50 mL) and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, then 9:1 hexane:ethyl acetate to afford 4-([1,1'-biphenyl]-4-ylethynyl)-2,6-dimethylpyrimidine (12 mg, 3%) as a yellow solid.
M.p.= 145-148 C. 'H NMR (CDC13, 300 MHz) S 7.70-7.60 (m, 5H), 7.49-7.36 (m, 4H), 7.19 (s, 1H), 2.73 (s, 3H), 2.52 (s, 3H). MS (ESI) 285.0 (M+H).
Example 172 Synthesis of 2-f(trimethylsilvl)ethynyllpyrazine PdC12 (60 mg, 0.34 mmol), Cu! (151 mg, 0.79 mmol), and triethylamine (3.8 mL, 27 mmol) were combined in DME (10 mL) under argon. Argon was bubbled through the suspension, and after 10 min triphenylphosphine (349 mg, 1.33 mmol) was added and the reaction flask was immersed in a 50 C
oil bath. The argon flow was discontinued after an additional 5 min, then trimethylsilylacetylene (2.4 mL, 17 mmol), and 2-iodopyrazine (1.66 g, 8.06 mmol) were added as a solution in DME (5 mL), followed by a rinse of the flask and syringe with DME (3 mL). After stirring for 16 h at 50 C, GC/MS
analysis of the dark brown suspension showed no 2-iodopyrazine remaining. The reaction mixture was cooled to ambient temperature, filtered, and the solids were washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo to afford a dark oil, which was diluted with diethylether (100 mL), and washed with saturated aqueous NaHCO3 (25 mL). The basic organic layer was extracted with diethylether (50 mL), and the combined organics were washed with brine (25 mL), dried over Na2SO4, filtered, concentrated in vacuo, then diluted with benzene and concentrated in vacuo again to remove any remaining H2O as its azeotrope. The crude material was purified by column chromatography on silica gel eluting with hexane, 30:1, then 20:1 hexane:ethyl acetate to afford 2-[(trimethylsilyl)ethynyl]pyrazine (1.2 g, 88%) as a yellow oil. ' H NMR
(CDC13, 300 MHz) S 8.89 (s, 1 H), 8.5 5 (d, J=3 Hz, 1 H), 8.49 (d, J=3 Hz, 1 H), 0.29 (s, 9H). MS (El ionization) 176 (M').
Example 173 Synthesis of 2-(11,1'-biphenyl-4-vlethynyl)pyrazine Cu! (84 mg, 0.44 mmol), PdCl2(PPh3)2 (155 mg, 0.22 mmol), triphenylphosphine (116 mg, 0.442 mmol), and tetrabutylammonium iodide (630 mg, 1.7 mmol) were combined in dry DMF (25 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it. Triethylamine (0.8 mL, 8 mmol), was added, the reaction mixture was warmed to 40 C, and a solution of 4-bromo-1,1'-biphenyl (515 mg, 2.2 mmol) and 2-[(trimethylsilyl)ethynyl]pyrazine from Example 172 (300 mg, 1.7 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (2.2 mL of a 1.0 M solution in THF, 2.2 mmol) was added by syringe pump over 2 h. After stirring for an additional 2 h, TLC and GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (50 mL) and filtered through CeliteTM.
The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, 9:1, then 8.5:1.5 hexane:ethyl acetate to afford 2-([1,1'-biphenyl]-4-ylethynyl)pyrazine (100 mg, 23%) as a yellow solid. M.p.= 112-113 C.
'H NMR (CDC13, 300 MHz) 6 8.88 (s, 11-1), 8.78 (s, 1H), 8.64 (s, 1H), 7.62-7.61 (m, 6H), 7.50-7.38 (m, 3H). MS (ESI) 257.0 (M+H).
Example 174 Synthesis of 4,6-dimethyl-2-1(trimethylsilyl)ethynyllpyrimidine PdCl2 (234 mg, 1.32 mmol), Cul (737 mg, 3.87 mmol), and triethylamine (23 mL, 165 mmol) were combined in DME (50 mL) under argon. Argon was bubbled through the suspension, and after 10 min triphenylphosphine (1.37 g, 5.22 mmol) was added and the reaction flask was immersed in a 50 C
oil bath. The argon flow was discontinued after an additional 5 min, then trimethylsilylacetylene (12 mL, 85 mmol), and 4,6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate (11.3 g, 44.1 mmol), were added as a solution in DME (10 mL) followed by a rinse of the flask and syringe with DME (10 mL).
The reaction mixture rapidly turned from a dark orange color to black as the 4,6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate solution was added. After stirring for 30 min at 50'C, GUMS
analysis of the black suspension showed no 4,6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate remaining. The reaction mixture was allowed to cool to ambient temperature.
The reaction mixture was concentrated in vacuo, diluted with diethylether (200 mQ, filtered, and the solids were washed thoroughly with diethylether. The combined filtrates were washed with saturated aqueous NaHC03 (50 mL), at which time a large quantity of solids appeared. The suspension was again filtered. The two layers of the filtrate were separated, and the aqueous layer was extracted with diethylether (2 x 50 ML).
The combined organics were washed with brine, dried over Na2S04, filtered, and concentrated in vacuo.
The crude material was purified by column chromatography on silica gel eluting with hexane, 20:1, 10:1, then 8:1 hexane:ethyl acetate to afford an orange oil with some white fluffy solids present. This was diluted with hexane and filtered through a plug of CeliteTm to remove the white solids. The filtrate was concentrated in vacuo to afford 4,6-dimethyl-2-[(trimethylsilyl)ethynyl]pyrimidine (4.63 g, 51%), as an orange oil. During the elution of the column, while the desired compound was eluting, the flow rate dropped and the column plugged so that elution was no longer possible.
The silica gel from the column was slurried with ethyl acetate and CH2C12, and filtered. The silica gel was then washed thoroughly with ethyl acetate. The combined filtrates were combined and concentrated in vacuo to afford a dark oil, which was quite clean by NMR analysis showing desired product contaminated with some material exhibiting extra phenyl signals (possibly triphenylphosphine).
'H NMR (CDC13, 300 MHz) 8 6.98 (s, 1H), 2.49 (s, 3H), 0.28 (s, 9H). MS (EI ionization) 204 (M).
Example 175 Synthesis of 2-([1,1'-biphenyll-4-ylethynyo-4,6-dimethylpyrimidin Cul (84.0 mg, 0.442 mmol), PdC12(PPh3)2 (155 mg, 0.22 mmol), triphenylphosphine (116 mg, 0.44 mmol), and tetrabutylammonium iodide (630 mg, 1.7 mmol) were combined in dry DUT (25 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it. Triethylamine (0.8 mL, 8 mmol), was added, the reaction mixture was warmed to 40'C, and a solution of 4-bromo-1,1'-biphenyl (515 mg, 2.2 mmol) and 4,6-dimethyl-2-[(trimethylsilyl)ethynyl]pyrimidine from Example 174 (340 mg, 1.7 mmol) in DMF (10 mL) was added. The reaction was warmed to 70'C and tetrabutylammonium fluoride (2.2 mL of a 1.0 M solution in THF, 2.2 mmol) was added by syringe pump over 2 h. After stirring for an additional 2 h, TLC and GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (50 mL) and filtered through Celite TM . The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H20 (2 X
200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, 9:1, 8.5:1.5 hexane:ethyl acetate to afford 2-([I,I'-biphenyl]-4-ylethynyl)-4,6-dimeihylpyrimidine (180 mg, 42%) as a yellow solid. The 2-([I,I'-biphenyl]-4-ylethynyl)-4,6-dimethylpyrimidine was dissolved in diethylether (20 mL) and HCI (12 mL of a 1.0 M solution in diethylether, 12 mmol) was added.
The resulting precipitate was filtered, and crystallized from boiling ethyl acetate to afford 2-([1,1'-biphenyl]-4-ylethynyl)-4,6-dimethylpyrimidine hydrochloride (50 mg , 11%) as yellow crystals. M.p.= 163-165 C.
'H NMR (CDC13, 300 MHz) S 7.82 (d, J=3 Hz, 4H), 7.72-7.67 (m, 3H), 7.51-7.41 (m, 3H), 2.70(s, 614).
MS (ESI) 285.1 (M+H).
Example 176 Synthesis of 1-chloro-6-(trimethylsilyl)-3.5-hexadiyn-2-one Aluminum trichloride (6.85 g, 51.4 mmol) was suspended in CH2CI2 (100 mL) and cooled in an ice bath. A solution of 4-bis(trimethylsilyl)1,3-butadiyne (10.0 g, 51.4 mmol) and chloroacetyl chloride (4.1 mL, 51 mmol) in CH2CI2 (100 mL) was added to the AIC13 suspension dropwise from an addition funnel over 1 h. The dark brownish-red solution was stirred at 0 C for 1 h, then the ice bath was removed. After 1 h at ambient temperature, the reaction was cooled to 0 C and quenched by slow addition of 1M HCl (150 mL). The acidic aqueous solution was extracted with CH2C12 (2 x 300 mL), the combined organic layers were washed with H2O (500 mL), saturated aqueous NaHCO3 (500 mL), brine (500 mL) and dried over Na2SO4. The organic layer was filtered to afford a clear solution which was concentrated in vacuo. The crude 1-chloro-6-(trimethylsilyl)-3,5-hexadiyn-2-one (10 g) was used in the next step without purification. MS (El ionization) 183 (M+).
Example 177 Synthesis of 2-methyl-4-14-(trimethylsilyl)-1,3-butadiynyl-1,3-thiazole Crude 1-chloro-6-(trimethylsilyl)-3,5-hexadiyn-2-one from Example 176 (5.0 g, 25 mmol) was dissolved in DMF (70 mL), then thioacetamide (2.4 g, 33 mmol) was added in one portion. The mixture was allowed to stir for 16 h at ambient temperature, at which time TLC
showed no remaining 1-chloro-6-(trimethylsilyl)-3,5-hexadiyn-2-one. The mixture was diluted with ethyl acetate (200 mL), washed with H2O (3 x 300 mL), brine (300 mL), dried over Na2SO4, and filtered.
The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, then 20:1 hexane:ethyl acetate to afford 2-methyl-4-[4-(trimethylsilyl)-1,3-butadiynyl]-1,3-thiazole (1.2 g, 24%) as reddish-brown oil.' H NMR (CDC13, 300 MHz) S 7.39 (s, 1H), 2.68 (s, 3H), 0.26 (s, 9H). MS (EI ionization)219 (M).
Example 178 Synthesis of N-hydroxybenzenecarboximidoyl chloride To a solution of syn-benzaldehyde oxime (12 g, 99 mmol) in DMF (70 mL) was added N-chlorosuccinimide (15.8 g, 118 mmol). After stirring at ambient temperature for 64 h, TLC analysis showed no starting oxime present. The reaction mixture was diluted with diethylether (600 mL), washed with a 1:1 mixture of H20:saturated aqueous NaCl (2 x 200 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo to afford an oil that was diluted with toluene and concentrated in vacuo to remove any remaining H2O. The resulting crude product was purified by column chromatography on silica gel eluting with hexane, 30:1, then 20:1 hexane:ethyl acetate to afford N-hydroxybenzenecarboximidoyl chloride (5.77 g, 37%) as white crystals. M.p.=
52-53 C. ' H NMR
(CDC13, 300 MHz) S 9.00 (s, 1H), 7.84 (d, J=6 Hz, 2H), 7.49-7.37 (m, 3H).
Example 179 Synthesis of 5-1(2-methyl-1,3-thiazol-4-vl)ethynyll-3-phenylisoxazole To a solution of 2-methyl-4-[4-(trimethylsilyl)-1,3-butadiynyl]-1,3-thiazole from Example 177 (220 mg, 1.0 mmol) in dry diethylether (20 mL) under argon, tetrabutylammonium fluoride (1.1 mL of a 1.0 M solution in THF, 1.1 mmol) was added by syringe during 15 min. After stirring for 0.5 h, TLC
and GC/MS analysis showed the reaction to be complete. Then N-hydroxybenzenecarboximidoyl chloride from Example 178 (233 mg, 1.5 mmol) was added in one portion under argon. Triethylamine (0.20 mL in 20 mL dry diethylether, 1.5 mmol) was added by addition funnel during 2 h. After stirring for an additional 2 h, TLC and GC/MS analysis showed the reaction was not complete, another 1.5 mmol of N-hydroxybenzenecarboximidoyl chloride and triethylamine was added as described above.
After stirring for an additional 2h, the mixture was diluted with diethylether (50 mL) and washed with H2O (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, then 9:1 hexane:ethyl acetate to afford 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-phenylisoxazole (195 mg, 73%) as a yellow solid. The product was dissolved in diethylether (20 mL) and HC1 (15 mL of a 1.0 M solution in diethylether, 15 mmol) was added, the resulting precipitate was filtered and washed with diethylether to give 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-phenylisoxazole (90 mg, 34%) as yellow crystals. M.p.=
118-120 C. Elemental analysis of the material for C, H, N and Cl showed the material to be the free base, not the hydrochloride salt. 'H NMR (CDC13, 300 MHz) S 7.94 (s, 1H), 7.88-7.84 (m, 2H), 7.50-7.47 (m, 3H), 7.21 (s, 1H), 2.73 (s, 3H). MS (ESI) 267.0 (M+H).
Example 180 Synthesis of Ethyl 5-1(2-methyl-1,3-thiazol-4-yl)ethynyll-3-isoxazolecarboxylate To a solution of 2-methyl-4-[4-(trimethylsilyl)-1,3-butadiynyl]-1,3-thiazole from Example 177 (150 mg, 0.68 mmol) in dry diethylether (20 mL) under argon, tetrabutylammonium fluoride (0.75 mL
of a 1.0 M solution in THF, 0.75 mmol) was added by syringe during 15 min.
After stirring for 0.5 h, TLC and GC/MS analysis showed the reaction to be complete. Then commercially available ethyl (2-E,Z)-chloro(hydroxyimino)ethanoate (155 mg, 1.0 mmol) was then added in one portion under argon.
Triethylamine (0.14 mL, 1.0 mmol) was added as a solution in dry diethylether (20 mL) by addition funnel during 2 h. After stirring for an additional 2 h, TLC and GC/MS
analysis showed the reaction was not complete. Another portion of ethyl (2-E,Z)-chloro(hydroxyimino)ethanoate (155 mg, 1.0 mmol) and triethylamine (0.14 mL, 1.0 mmol) was added as described above.
After stirring for an additional 2 h, the mixture was diluted with diethylether (50 mL) and washed with H2O (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, then 9:1 hexane:ethyl acetate to afford ethyl 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-isoxazolecarboxylate (120 mg, 72%) as a yellow solid. The ethyl 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-isoxazolecarboxylate was dissolved in diethylether (20 mL) and HC1 (16 mL of a 1.0 M solution in diethylether, 16 mmol) was added.
The resulting precipitate was filtered and washed with diethylether to give ethyl 5-[(2-methyl-1,3-thiazol-4-yl)-ethynyl]-3-isoxazolecarboxylate (75 mg, 42%) as yellow crystals. M.p.= 125-127 C. Elemental analysis for C, H, N, and Cl showed the compound to be the free base, not the hydrochloride salt. 'H
NMR (CDC13, 300 MHz) S 8.22 (s, 1H), 7.21 (s, 1H), 4.43 (q, J=9 Hz, 2H), 2.87 (s, 3H), 1.40(t, J=6 Hz, 3H). MS (ESI) 263.0 (M+H).
Example 181 Synthesis of 2-methoxy-5-[(2-methyl-1,3-thiazol-4-yl)ethyny-Ilpyridine CuI (40 mg, 0.2 mmol), PdC12(PPh3)2 (72 mg, 0.10 mmol), triphenylphosphine (54 mg, 0.2 mmol), and tetrabutylammonium iodide (376 mg, 1.0 mmol) were combined in dry DMF (20 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (0.71 mL, 5.1 mmol) was added, the reaction mixture was warmed to 40 C, and a solution of 5-bromo-2-methoxypyridine (231 mg, 1.23 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (200 mg, 1.0 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.3 mL of a 1.0 M solution in THF, 1.3 mmol) was added by syringe pump over 2 h. After stirring for an additional 2 h, TLC and GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (100 mL) and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O
(2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, then 9:1 hexane:ethyl acetate to afford 2-methoxy-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (150 mg, 20%) as a yellow solid. The product was further purified by crystallization from boiling hexane to give 2-methoxy-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (120 mg, 51%) as yellow crystals.
M.p.= 110-111 C. 'H NMR
(CDC13, 300 MHz) S 8.38 (d, J=2 Hz, 1H), 7.71 (dd, J=2, 9 Hz, 1H), 7.37 (s, 1H), 6.73 (d, J=9 Hz, 1H).
MS (ESI) 230.9 (M+H).
Example 182 Synthesis of 5-[(2-methyl-1,3-thiazol-4-yl ethynyllpyrimidine PdC12 (27.8 mg, 160 mol), Cu1(77 mg, 400 mol), and triethylamine (3.0 mL, 22 mmol) were combined in DME (10 mL) under argon. Argon was bubbled through the suspension, and after 10 min triphenylphosphine (166 mg, 630 mol) was added and the reaction flask was heated on a heating mantle. The argon flow was discontinued after an additional 5 min, then 5-bromopyrimidine (830 mg, 5.2 mmol), and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (826 mg, 4.2 mmol), were added as a solution in DME (5 mL) followed by a rinse of the flask and syringe with DME
(2 mL). Tetrabutylammonium fluoride (5.0 mL of a 1.0 M solution in THF, 5.0 mmol) was then added to the reaction mixture dropwise over 10 min. After stirring for an additional 2.5 h at 65 C, GC/MS
analysis showed no remaining 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole, nor desilylated alkyne present. The reaction mixture was allowed to slowly cool to ambient temperature over 16 h, concentrated in vacuo, diluted with ethyl acetate (150 mL), H2O (50 mL) and saturated aqueous NaHCO3 (25 mL). The basic aqueous layer was extracted with ethyl acetate (2 x 50 mL). The combined organics were washed with brine (50 mL), dried over Na2SO4, filtered, and concentrated to afford a brown solid. The crude product was purified by column chromatography on silica gel eluting with hexane 3:1, 2:1, then 3:2 hexane:ethyl acetate to afford 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyrimidine (687 mg, 81 %) as a brownish-yellow solid. M.p. 118.5-119.5 C. 'H NMR
(CDC13, 300 MHz) S 9.17 (s, 1H), 8.89 (s, 2H), 7.51 (s, 1H), 2.76 (s, 3H). MS
(EI ionization) 201 (M+).
Example 183 Synthesis of 5-[(2-methyl-1,3-thiazol-4-yl)ethynyllnicotinonitrile PdC12 (25 mg, 140 mol), CuI (78 mg, 410 mol), and triethylamine (3.0 mL, 22 mmol) were combined in DME (10 mL) under argon. Argon was bubbled through the suspension, and after 10 min triphenylphosphine (150 mg, 570 mol) was added and the reaction flask was heated on a heating mantle. The argon flow was discontinued after an additional 5 min, then 5-bromonicotinonitrile (980 mg, 5.3 mmol), and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (867 mg, 4.4 mmol), were added as a solution in DME (5 mL) followed by a rinse of the flask and syringe with DME
(2 mL). Tetrabutylammonium fluoride (5.0 mL of a 1.0 M solution in THF, 5.0 mmol) was then added to the reaction mixture dropwise over 10 min. After stirring for 16 h at 55 C, GC/MS analysis showed no remaining 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole, nor desilylated alkyne present. The reaction mixture was allowed to cool to ambient temperature overnight, concentrated in vacuo, diluted with ethyl acetate (150 mL), H2O (50 mL) and saturated aqueous NaHCO3 (25 mL).
The basic aqueous layer was extracted with ethyl acetate (2 x 50 mL). The combined organics were washed with brine (50 mL), dried over Na2SO4, filtered, and concentrated to afford a brown solid.
The crude product was purified on a Biotage Flash system eluting with 100:1 CHCI3:CH30H to afford 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]nicotinonitrile (201 mg, 20 %) as a yellow solid. (there were a large number of impure fractions from the column) M.p. 173-175 C. 'H NMR (CDCl3i 300 MHz) S
8.94 (d, J=2.0 Hz, 1H), 8.82 (d, J=2.0 Hz, 1H), 8.08 (t, J=2.0 Hz, 1H), 7.52 (s, 1H), 2.77 (s, 3H). MS (EI ionization) 225 (M).
Example 184 Calcium Flux Assay The activity of compounds was examined against the hmGluR5a receptor stably expressed in mouse fibroblast Ltk- cells (the hmGluR5a/L38-20 cell line). See generally Daggett et al., Neuropharmacology 34:871-886 (1995). Receptor activity was detected by changes in intracellular calcium ([Ca+'];) measured using the fluorescent calcium-sensitive dye, fura-2. hmGluR5a/L38-20 cells were plated onto 96-well plates, and loaded with 3 p.M fura-2 for I h.
Unincorporated dye was washed from the cells, and the cell plate was transferred to a custom-built 96-channel fluorimeter (SIBIA-SAIC, La Jolla, CA) which is integrated into a fully automated plate handling and liquid delivery system. Cells were excited at 350 and 385 nm with a xenon source combined with optical filters. Emitted light was collected from the sample through a dichroic mirror and a 510-nm interference filter and directed into a cooled CCD camera (Princeton Instruments). Image pairs were captured approximately every 1 s, and ratio images were generated after background subtraction. After a basal reading of 20 s, an ECBO concentration of glutamate (10 M) was added to the well, and the response evaluated for another 60 s. The glutamate-evoked increase in [Ca+ji in the presence of the screening compound was compared to the response of glutamate alone (the positive control). Results obtained from testing certain exemplary compounds from this assay are presented in Table 1.
Example 185 Phosphatidylinositol hydrolysis (IP1) assays Inositol phophate assays were performed as described by Berridge et al ..(1982) (Berridge et al, (1982) Biochem. J. 206: 587-5950; and Nakajima et al., JBiol. Chem. 267:2437-2442 (1992)) with slight modifications. Mouse fibroblast Ltk cells expressing hmGluR5 (hmGluR5/L38-20 cells) were seeded in 24-well plates at a density of 8x105 cells/well. One p.Ci of [3H]-inositol (Amersham PT6-271;
Arlington Heights, Ill.; specific activity = 17.7 Ci/mmol) was added to each well and incubated for 16 h at 37 C. Cells were washed twice and incubated for 45 min in 0.5 ml of standard Hepes buffered saline buffer (FIBS; 125 mM NaCI, 5 mM KCI, 0.62 mM MgSO4, 1.8 mM CaCl2, 20 mM HEPES, 6 mM
glucose, pH to 7.4). The cells were washed with FIBS containing 10 mM LiCI, and 400 l buffer added to each well. Cells were incubated at 37 C for 20 min. For testing, 50 l of 10X compounds used in the practice of the invention (made in HBS/LiCI (100 mM)) was added and incubated for 10 minutes.
Cells were activated by the addition of 10 pM glutamate, and the plates left for 1 hour at 37 C.
The incubations were terminated by the addition of I ml ice-cold methanol to each well. In order to isolate inositol phosphates (IPs), the cells were. scraped from wells, and placed in numbered glass test tubes. One ml of chloroform was added to each tube, the tubes were mixed, and the phases separated by centrifugation. IN were separated on Dowex anion exchange columns (AG I-X8 100.200 mesh formate form). The upper aqueous layer (750 ul) was added to the Dowex columns, and the Trademark columns eluted with 3 ml of distilled water. The eluents were discarded, and the columns were washed with 10 mls of 60 mM ammonium formate/5 mM Borax, which was also discarded as waste. Finally the columns were eluted with 4 ml of 800 mM ammonium formate/0.1 M formic acid, and the samples collected in scintillation vials. Scintillant was added to each vial, and the vials shaken, and counted in a scintillation counter after 2 hours. Phosphatidylinositol hydrolysis in cells treated with certain exemplary compounds was compared to phosphatidylinositol hydrolysis in cells treated with control and the results are shown in Table 1.
Example 186 Analgesic Animal Model (CFA Model) Compounds that modulate receptor-mediated analgesic responses were tested in an animal model. Robust inflammation was induced by the injection of complete Freund's adjuvant (CFA, 10 mg/ml) subcutaneously into the hind paw of male Sprague-Dawley rats (150-175 g). The inflammatory response to CFA began approximately 12-hrs post-CFA injection and persisted for several days following inoculation. The inflamed hind paw became sensitive to noxious (paw pinch, plantar test) or innocuous (cold plate, Von Frey filaments) stimuli compared to the contralateral hind paw. Test compounds (240 pmol/kg) were administered via intraperitoneal injection. The analgesic activity of compounds was evaluated one to 24-hours post administration by assessing (1) the duration of analgesic effect; (2) threshold to elicit response; and (3) time from painful stimulus to response. A
general increase in duration of analgesic effect, threshold to painful stimuli or time to respond following compound administration suggested analgesic efficacy. For each group of animals, responses following administration of certain exemplary compounds were compared to responses prior to compound administration. Results are presented in Table 1.
TABLE 1*
. 51 + + +
W, 52 + + ND
+
U -~ U
54 + + +
44 + - ND 55 + + ND
45 + - ND 56 + + ND
46 + + + 57 + + ND
47 + + + 58 - - ND
48 + + ND 59 - - ND
49 + - - 60 - - ND
50 + - ND 61 - - ND
62 + - ND 114 + + ND
63 + - ND 115 + + ND
64 - - ND 117 + + ND
65 + + - 118 + + ND
66 + + ND 120 + + +
69 + + ND 126 + + ND
74 ND - ND 127 + + ND
75 + + ND 131 + + ND
79 + + + 133 + + +
80 + + + 134 + + ND
82 + + ND 135 + + -83 + - ND 136 + + ND
86 + + + 137 + + ND
87 + + ND 138 + + ND
88 + + ND 139 + + ND
89 + + + 140 + ND ND
90 + + ND 141 + + ND
91 + ND ND 142 + + ND
92 + + ND 143 + + ND
93 + + ND 144 + + ND
94 ND - ND 145 + + ND
95 + + - 148 ND + ND
96 + + ND 150 + + -98 + + ND 152 + + ND
100 + ND ND 155 + + ND
101 + + + 157 + + +
103 - ND ND 158 + + ND
104 + + ND 159 + + ND
105 + + ND 160 + + ND
106 + + ND 161 + + ND
107 + + ND 162 + + ND
108 + + - 163 + + ND
109 + + ND 164 + + ND
110 + + + 165 + + ND
111 + + + 166 + + -112 + + + 167 + + ND
113 + + - 168 + - ND
169 + + + 181 + ND ND
173 + + ND 182 + + ND
179 + + - 183 + + +
180 + + ND
*Table Legend:
Ca 2+ Flux:
+: 0.1 nmol < IC50 < 10 gmol -: IC50> 10 mol PI Hydrolysis:
+: 1.0 nmol < IC50 < 10 pmol -: IC50 > 10 mol CFA Model:
+ = analgesic efficacy - = analgesic inefficacy ND = not determined Data presented in Table 1 demonstrate that the activity of metabotropic glutamate receptor 5 (mGluR5), assessed by measuring receptor-activated changes in calcium flux, may be modulated by compounds contemplated for use in the practice of the invention. In assays using cells transfected with mGluR5a, a majority of invention compounds are effective at decreasing intracellular calcium flux, and decreasing phosphoinositol hydrolysis.
Example 187 Salt forms of 2-(Phenylethynyl)-1,3-thiazole Various salt forms of 2-(phenylethynyl)-1,3-thiazole were prepared, and their solubility, hygroscopicity, and physical state were assessed. The compound 2-phenylethynl-1,3-thiazole was prepared (see Example 8) as well as hydrochloric acid, fumaric acid, methylsulfonic acid and toluene sulfonic acid salt forms of the compound. The hydrochloric acid salt form of 2-(phenylethynyl)-1,3-thiazole is an oil. A fumaric acid salt form was not obtained by preparative steps including trituration with diethylether. Preparation of the methylsulfonate form results in a semi solid, hygroscopic material.
These salt forms are typically unsuitable for certain pharmaceutical formulations, such as for tablets, capsules, and the like. In contrast to the salt forms of 2-(phenylethynyl)-1,3-thiazole, described previously, the tosylate salt form (i.e., the toluene.sulfonic acid salt) is a solid having a melting point of about 129 up to 131 C and is non-hygroscopic. Therefore, this form is presently preferred for pharmaceutical formulations of tablets, capsules, and the like.
While the invention has been described in detail with reference to certain preferred embodiments thereof, it will be understood that modifications and variations are within the spirit and scope of that which is described and claimed.
Hydroxy-lower alkyl is, for example, hydroxy-C,-C4alkyl, such as hydroxymethyl, 2-hydroxy ethyl, 3-hydroxypropyl, 2-hydroxyisopropyl or 4-hydroxybutyl. Halo-lower alkyl is, for example, polyhalo-C,-C4alkyl, such as trifluoromethyl.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, lower alkoxy is, for example, C,-C7alkoxy, preferably C,-C4alkoxy, such as methoxy, ethoxy, propyloxy, isopropyloxy or butyloxy, but may also represent isobutyloxy, sec.butyloxy, tert.-butyloxy or a C5-C,alkoxy group, such as a pentyloxy, hexyloxy or heptyloxy group.amino-lower alkoxy is, for example, amino-C2-C4alkoxy preferably of the formula -O-(CH2)n NRaRb in which n is 2 or 3, such as 2-aminoethoxy, 3-aminopropyloxy or 4-aminobutyloxy. Carboxy-lower-alkoxy is, for example, carboxy-C,-C4alkoxy, such as carboxymethoxy, 2-carboxyethoxy, 3-carboxypropyloxy or 4-carboxybutyloxy. Lower alkanoyloxy is, for example, C,-C7alkanoyloxy, such as acetoxy, propionyloxy, butyryloxy, isobutyryloxy or pivaloyloxy. Halo-lower alkoxy is, for example, halo- or polyhalo-C,-C7alkoxy, preferably halo- or polyhalo-C,-C4alkoxy, such as halo-or polyhaloethoxy, halo-or polyhalopropyloxy or butyl-oxy, wherein "poly" refers, for example, to tri-or pentahalo, and "halo"
denotes, for example, fluoro or chloro.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, lower alkylamino-lower alkoxy is, for example, C,-C4alkylamino-C2-C4alkoxy, preferably of the formula -O-(CH2)n-NRaRb in which n is 2 or 3 and Ra and Rb, independently of each other, denote lower alkyl groups as defined hereinbefore, such as methyl, ethyl, propyl or butyl. Lower alkylamino-lower alkyl is, for example, C,-C4alkylamino-C,-C4alkyl, preferably of the formula -(CH2)n NRaRb in which n is 2 or 3 and Ra and Rb, independently of each other, denote lower alkyl groups as defined hereinbefore, such as methyl, ethyl, propyl or butyl. Di-lower alkylamino-lower alkyl is, for example, Di-C,-C4alkylamino-C,-C4alkyl, preferably of the formula -(CH2)n NRaRb in which n is 2 or 3 and Ra and Rb, independently of each other, denote lower alkyl groups such as methyl, ethyl, propyl or butyl. Di-lower alkylamino-lower alkoxy is, for example, Di-C,-C4alkylamino-C2-C4alkoxy, preferably of the formula -O-(CH2)n-NRaRb in which n is 2 or 3 and Ra and Rb, independently of each other, denote lower alkyl groups such as methyl, ethyl, propyl or butyl.
As used herein, with reference to compounds excluded herein when referring to novel compounds of the invention, optionally hydroxy-substituted lower alkyleneamino-lower alkyl is, for example, unsubstituted or hydroxy-substituted 5- to 7-membered alkyleneamino-C,-C4alkyl, preferably of the formula -(CH2) -R, in which n is 2 or 3 and R, pyrrolidino, hydroxypyrrolidino, piperidino, hydroxypiperidino, homopiperidino or hydroxyhomopiperidino. Furthermore, optionally hydroxy-substituted lower alkyleneamino-lower alkoxy is, for example, unsubstituted or hydroxy-substituted 5-to 7-membered alkyleneamino-Ci-C4alkoxy, preferably of the formula -O-(CH2) -&
in which n is 2 or 3 and R, pyrrolidino, hydroxypyrrolidino, piperidino, hydroxypiperidino, homopiperidino or hydroxyhomopiperidino.
In accordance with another embodiment of the present invention, there are provided pharmaceutical compositions comprising heterocyclic compounds as described above, in combination with pharmaceutically acceptable carriers. Optionally, invention compounds can be converted into non-toxic acid addition salts, depending on the substituents thereon. Thus, the above-described compounds (optionally in combination with pharmaceutically acceptable carriers) can be used in the manufacture of medicaments useful for the treatment of a variety of indications.
Pharmaceutically acceptable carriers contemplated for use in the practice of the present invention include carriers suitable for oral, sublingual intravenous, subcutaneous, transcutaneous, intramuscular, intracutaneous, intrathecal, epidural, intraoccular, intracranial, inhalation, rectal, vaginal, and the like administration. Administration in the form of creams, lotions, tablets, capsules, pellets, dispersible 'powders, granules, suppositoiries, syrups, elixirs, lozenges, injectable solutions, sterile aqueous or non-aqueous solutions, suspensions or emulsions, patches, and the like, is contemplated. Pharmaceutically acceptable carriers include glucose, lactose, gum acacia, gelatin, mannitol, starch paste, magnesium trisilicate, talc, corn starch, keratin, colloidal silica, potato starch, urea, dextrans, and the like.
Invention compounds can optionally be converted into non-toxic acid addition salts. Such salts are generally prepared by reacting the compounds of this invention with a suitable organic or inorganic acid..
Representative salts include hydrochloride, hydrobromide, sulfate, bisulfate, methanesulfonate, acetate, oxalate, adipate, alginate, aspartate, valerate, oleate, laurate, borate, benzoate, lactate, phosphate, toluenesulfonate (tosylate), citrate, malate, maleate, fumarate, succinate, tartrate, napsylate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, benzenesulfonate, butyrate, camphorate, camphorsulfonate, cyclopentanepropionate, digluconate, dodecylsulfate, glucoheptanoate, glycerophosphate, heptanoate, hexanoate, undecanoate, 2-hydroxyethanesulfonate,ethanesulfonate, and the like. Salts can also be formed with inorganic acids such as sulfate, bisulfate, hemisulfate, hydrochloride, chlorate, perchlorate, hydrobromide, hydroiodide, and the like.
Examples of a base salt include ammonium salts; alkali metal salts such as sodium salts, potassium salts, and the like; alkaline earth metal salts such as calcium salts, magnesium salts, and the like; salts with organic bases such as dicyclohexylamine salts, N-methyl-D-glucamine, phenylethylamine, and the like;
and salts with amino acids such as arginine, lysine, and the like. Such salts can readily be prepared employing methods well known in the art.
In accordance with another embodiment of the present invention, there are provided methods for the preparation of heterocyclic compounds as described above. For example, many of the heterocyclic compounds described above can be prepared using synthetic chemistry techniques well known in the art (see Comprehensive Heterocyclic Chemistry, Katritzky, A. R.
and Rees, C. W. eds., Pergamon Press, Oxford, 1984) from a precursor of the substituted heterocycle of Formula 1 as outlined in Scheme 1.
Scheme 1 X.
Y,X,W Coupling_ (R)qW
(R)q Z -:N D + E = B z.N
B
Thus in Scheme 1, a substituted heterocycle precursor (prepared using synthetic chemistry techniques well known in the art) is reacted with an alkyne derivative. In Scheme 1, (R)q, W, X, Y, Z
and B are as defined above and D and E are functional groups which are capable of undergoing a transition metal-catalyzed cross-coupling reaction. For example, D is a group such as hydrogen, halogen, acyloxy, fluorosulfonate, trifluoromethanesulfonate, alkyl- or arylsulfonate, alkyl- or arylsulfinate, alkyl- or arylsulfide, phosphate, phosphinate, and the like, and E is hydrogen or a metallic or metalloid species such as Li, MgX (X is halogen), SnR3, B(OR)2, SiR3, GeR3, and the like. The coupling may be promoted by a homogeneous catalyst such as PdC12(PPh3)2i or by a heterogeneous catalyst such as Pd on carbon in a suitable solvent (e.g., tetrahydrofuran (THF), dimethoxyethane (DME), acetonitrile, dimethylformamide (DMF), etc.). Typically, a co-catalyst such as copper (I) iodide and a base (e.g., triethylamine, K2CO3 etc.) will also be present in the reaction mixture. The coupling reaction typically proceeds by allowing the reaction temperature to warm slowly from about 0 C up to ambient temperature over a period of several hours. The reaction mixture is then maintained at ambient temperature, or heated to a temperature anywhere between 30 C and 150 C. The reaction mixture is then maintained at a suitable temperature for a time in the range of about 4 up to 48 hours, with about 12 hours typically being sufficient. The product from the reaction can be isolated and purified employing standard techniques, such as solvent extraction, chromatography, crystallization, distillation, and the like.
Another embodiment of the present invention is illustrated in Scheme 2. A
substituted heterocycle precursor is reacted with an alkene derivative in a manner similar to the procedure described for Scheme 1.
Scheme 2 Y 'X, W
W + EB Coupling (R)q -To (R)4 z.Np z. N" B
The alkene derivative product from Scheme 2 may be converted to an alkyne derivative using the approach outlined in Scheme 3.
Scheme 3 X. X. X.
(R)qW Halogenation (R)4W G Base (R)qW
.N
z.`NJ~j,tiB z.NB z G B
5 Thus, the alkene derivative may be contacted with a halogenating agent such as chlorine, bromine, iodine, NCS (N-chlorosuccinimide), NBS (N-bromosuccinimide), NIS (N-iodosuccinimide), iodine monochloride, etc. in a suitable solvent (CC14, CHC13, CH2C12, acetic acid, and the like). The resulting halogenated derivative (G = halogen) is then treated with a suitable base such as NaOH, KOH, DBU (1,8-diazabicyclo[5.4.0]undec-7-ene), DBN (diazabicyclononene), DABCO
10 (1,4-diazabicyclo[2.2.2] octane), and the like, which promotes a double elimination reaction to afford the alkyne. The reaction is carried out in a suitable solvent such as ethanol, acetonitrile, toluene, etc. at an appropriate temperature, usually between about 0 C and 150 C.
In another embodiment of the present invention, a substituted heterocyclic derivative is reacted with an aldehyde or ketone to provide a substituted alkene. (See Scheme 4.) Scheme 4 Y 'X, W =+ O B Catalyst (R)gYW OR (R)q W
(R)q z.N~
K z.N B z.N-L6 Thus, in Scheme 4, J is hydrogen, PR3, P(O)(OR)2, SO2R, SiR3, and the like, K
is hydrogen, alkyl or aryl (as defined previously) and R is hydrogen, acetyl, and the like.
Suitable catalysts for this reaction include bases such as NaH, n-buytllithium, lithium diisopropylamide, lithium hexamethyl disilazide, H2NR, HNR2, NR3 etc., or electropositive reagents such as Ac20, ZnCl2, and the like. The reaction is carried out in a suitable solvent (THF, acetonitrile, etc.) at an appropriate temperature, usually between about 0 C and 150 C. Sometimes an intermediate is isolated and purified or partially purified before continuing through to the alkene product.
In yet another embodiment of the present invention, a substituted heterocyclic aldehyde or ketone is reacted with an activated methylene-containing compound to provide a substituted alkene.
(See Scheme 5.) Scheme 5 Y"X. W X.
(R)q O + B Catalyst (R)4 Y W 0- (R)q W y 'X' N i Ng z.N~B
K OR
Thus, in Scheme 5, J, K, R, the-catalyst and reaction conditions are as described for Scheme 4.
Again, as in Scheme 4, sometimes an intermediate is isolated and purified or partially purified before continuing through to the alkene product.
The alkene products from the reactions in Scheme 4 and Scheme 5 may be converted to an alkyne derivative using reagents and conditions as described for Scheme 3.
Another method for the preparation of heterocyclic compounds of Formula I is depicted in Scheme 6.
Scheme 6 Y )q Heat (R)q + G Y'~ Y=O,S
H
O L-g (R)q N L-B
In scheme 6, Y is 0 or S and G is halogen or a similar leaving group, and L
and B are as defined previously. The reagents are contacted in a suitable solvent such as ethanol, DMF, and the like and stirred until the product forms. Typically reaction temperatures will be in the range of ambient through to about 150 C, and reaction times will be from about 1 h to about 48 h, with about 70 C and 4 h being presently preferred. The heterocycle product can be isolated and purified employing standard techniques, such as solvent extraction, chromatography, crystallization, distillation, and the like. Often, the product will be isolated as the hydrochloride or hydrobromide salt, and this material may be carried onto the next step with or without purification.
Yet another method for the preparation of heterocyclic compounds of Formula I
is depicted in Scheme 7.
Scheme 7 (R)q G W\ Heat (R)q + H, ~\ W W=O,S
(R)q-~-,O L-B (R)q---'N""-L-B
In Scheme 7, W may be 0 or S, G is halogen or a similar leaving group, and L
and B are as defined previously. The reaction conditions and purification procedures are as described for Scheme 6.
In another embodiment of the present invention, depicted in Scheme 8, an alkynyl-substituted heterocycle precursor (prepared using synthetic chemistry techniques well known in the art) is reacted with a species B, bearing a reactive functional group D (See Scheme 8.) Scheme 8 (R)q(Y ~W
(R)q__1 10'N' .X.W + p` Coupling u B z.N
E B
In Scheme 8, (R)q, W, X, Y, Z and B are as defined above and D and E are functional groups which are capable of undergoing a transition metal-catalyzed cross-coupling reaction. For example, D
is a group such as hydrogen, halogen, acyloxy, fluorosulfonate, trifluoromethanesulfonate, alkyl- or arylsulfonate, alkyl- or arylsulfinate, alkyl- or arylsulfide, phosphate, phosphinate, and the like, and E is hydrogen or a metallic or metalloid species such as Li, MgX (X is halogen), SnR3, B(OR)2, SiR3, GeR3, and the like. The coupling may be promoted by a homogeneous catalyst such as PdC12(PPh3)2, or by a heterogeneous catalyst such as Pd on carbon in a suitable solvent (e.g.
tetrahydrofuran (THF), dimethoxyethane (DME), acetonitrile, dimethylformamide (DMF), etc.). Typically a co-catalyst such as copper (I) iodide and the like and a base (e.g. triethylamine, K2CO3, etc.) will also be present in the reaction mixture. The coupling reaction is typically allowed to proceed by allowing the reaction temperature to warm slowly from about 0 C up to ambient temperature over a period of several hours.
The reaction mixture is then maintained at ambient temperature, or heated to a temperature anywhere between about 30 C up to about 150 C. The reaction mixture is then maintained at a suitable temperature for a time in the range of about 4 up to about 48 hours, with about 12 hours typically being sufficient. The product from the reaction can be isolated and purified employing standard techniques, such as solvent extraction, chromatography, crystallization, distillation, and the like.
Another embodiment of the present invention is illustrated in Scheme 9.
Scheme 9 (R)q Y 'X' 3"~_E + D Coupling (R)q ~W
T-0 IN.
z.N~B z.N" "~B
An alkenyl-substituted heterocycle precursor is reacted with an alkene derivative in a manner similar to the procedure described for Scheme 8. The product alkene derivative from Scheme 9 may be converted to an alkyne derivative using the approach outlined previously in Scheme 3 above.
In yet another embodiment of the present invention, depicted in Scheme 10, an alkynyl-substituted heterocycle precursor is reacted with a species composed of a carbonyl group bearing substituents R' and CHR"R"'.
Scheme 10 X. ,X.
Y 'X, (R)qW + O Catalyst (Rkl ZOW (R)4 YW R~~' 30 Z' z N N OR N
E R R' R"
R"' Thus in Scheme 10, R', R" and R"' may be hydrogen or other substituents as described previously, or may optionally combine to form a ring (this portion of the molecule constitutes B in the final compound). E is hydrogen or a metallic or metalloid species such as Li, MgX, wherein X is halogen, SnR3, B(OR)2, SiR3, GeR3, and the like. Suitable catalysts for this reaction include bases such as NaH, n-butyllithium, lithium diisopropylamide, lithium hexamethylsilazide, H2NR, HNR2, NR3, nBu4NF, ethylmagnesium halide, etc. R in Scheme 10 may be hydrogen, Ac, and the like. Typically the reaction is carried out in a suitable solvent such as diethylether, THF, DME, toluene, and the like, and at an appropriate temperature, usually between -100 C and 25 C. The reaction is allowed to proceed for an appropriate length of time, usually from about 15 minutes to about 24 hours. The intermediate bearing the -OR group may be isolated and purified as described above, partially purified or carried on to the next step without purification. Elimination of the -OR
group to provide the alkene derivative may be accomplished using a variety of methods well known to those skilled in the art. For example, the intermediate may be contacted with POC13 in a solvent such as pyridine and stirred at a suitable temperature, typically between about 0 C and about 150 C, for an appropriate amount of time, usually between about 1 h and about 48 h. The product from the reaction can be isolated and purified employing standard techniques, such as solvent extraction, chromatography, crystallization, distillation, and the like.
In accordance with another embodiment of the present invention, there are provided methods of modulating the activity of excitatory amino acid receptors, said method comprising contacting said receptors with at least one compound as described above, as well as additional compounds of the same basic structure but having substitution patterns which may have been previously disclosed but never contmplated for use for such purposes. Thus, compounds contemplated for use in accordance with invention modulations methods include those having the structure A -L- B or enantiomers, diastereomeric isomers or mixtures of any two or more thereof, or pharmaceutically acceptable salts thereof, in an amount sufficient to modulate the activity of said excitatory amino acid receptor, wherein:
A is a 5-, 6- or 7-membered ring having the structure:
W
X V
(R)q-}- 0 Z
wherein at least one of V, W, X, Y and Z is (CR)P, wherein p is 0, 1 or 2;
at least one of V, W, X,VandZis0,NorS;
the remainder of V, W, X, Y and Z are each independently 0, N or S; and each R is independently halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocycle, mercapto, nitro, carboxyl, carbamate, carboxamide, hydroxy, ester, cyano, amine, amide, amidine, amido, sulfonyl or sulfonamide, wherein q is 0, 1, 2 or 3;
L is substituted or unsubstituted alkenylene, alkynylene, or azo; and B is substituted or unsubstituted hydrocarbyl, substituted or unsubstituted cyclohydrocarbyl, substituted or unsubstituted heterocycle, optionally containing one or more double bonds, or substituted or unsubstituted aryl;
provided, that the following compounds are excluded:
the compounds wherein A is a 6-membered ring wherein:
V, W, X and Y are (CR)p, wherein p is 1, Z is N;
R at the V position is hydrogen, lower alkyl, hydroxy, hydroxy-lower alkyl, amino-lower alkyl, lower alkylamino-lower alkyl, di-lower alkylamino-lower alkyl, unsubstituted or hydroxy-substituted lower alkyleneamino-lower alkyl, lower alkoxy, lower alkanoyloxy, amino-lower alkoxy, lower alkylamino-lower alkoxy, di-lower alkylamino-lower alkoxy, phthalimido-lower alkoxy, unsubstituted or hydroxy- or 2-oxo-imidazolidin-1-yl-substitued lower alkyleneamino-lower alkoxy, carboxy, esterified or amidated carboxy, carboxy-lower alkoxy or esterified carboxy-lower-alkoxy; R at the W position is hydrogen; R at the X position is hydrogen, lower alkyl, carboxy, esterified carboxy, amidated carboxy, hydroxy-lower alkyl, hydroxy, lower alkoxy or lower alkanoyloxy; and R at the Y
position is hydrogen, lower alkyl, hydroxy-lower alkyl, carboxy, esterified carboxy, amidated carboxy, unsubstituted or lower alkyl-, lower alkoxy-, halo- and/or trifluoromethyl-substituted N-lower alkyl-N-5 phenylcarbamoyl, lower alkoxy, halo-lower alkyl or halo-lower alkoxy;
L is substituted or unsubstituted alkenylene, alkynylene or azo, and B is substituted or unsubstituted aryl or heterocycle having two or more double bonds, wherein substituents are independently lower alkyl, lower alkenyl, lower alkynyl, phenyl, phenyl-lower alkynyl, hydroxy, hydroxy-lower alkyl, lower alkoxy, lower alkenyloxy, lower alkylenedioxy, lower 10 alkanoyloxy, phenoxy, phenyl-lower alkoxy, acyl, carboxy, esterified carboxy, amidated carboxy, cyano, nitro, amino, acylamino, N-acyl-N-lower alkylamino, halo and halo-lower alkyl, wherein phenyl, phenyl-lower alkynyl, phenoxy, and phenyl-lower alkoxy may bear further substituents.
As employed herein, "excitatory amino acid receptors" refers to a class of cell-surface receptors which are the major class of excitatory neurotransmitter receptors in the central nervous system. In 15 addition, receptors of this class also mediate inhibitory responses.
Excitatory amino acid receptors are membrane spanning proteins that mediate the stimulatory actions of the amino acid glutamate and possibly other endogenous acidic amino acids. Excitatory amino acids are crucial for fast and slow neurotransmission and they have been implicated in a variety of diseases including Alzheimer's disease, stroke, schizophrenia, head trauma, epilepsy, and the like. In addition, excitatory amino acids 20 are integral to the processes of long-term potentiation and depression which are synaptic mechanisms underlying learning and memory. There are three main subtypes of excitatory amino acid receptors: (1) the metabotropic receptors; (2) the ionotropic NMDA receptors; and (3) the non-NMDA receptors, which include the AMPA receptors and kainate receptors.
As employed herein, the phrase "modulating the activity of' refers to altered levels of activity so that the activity is different with the use of the invention method when compared to the activity without the use of the invention method. Modulating the activity of excitatory amino acid receptors includes the suppression or augmentation of the activity of receptors.
Suppression of receptor activity may be accomplished by a variety of means, including blocking of a ligand binding site, biochemical and/or physico-chemical modification of a ligand binding site, binding of agonist recognition domains, preventing ligand-activated conformational changes in the receptor, preventing the activated receptor from stimulating second messengers such as G-proteins, and the like.
Augmentation of receptor activity may be accomplished by a variety of means including, stabilization of a ligand binding site, biochemical and/or physico-chemical modification of a ligand binding site, binding of agonist recognition domains, promoting ligand-activated conformational changes in the receptor, and the like.
Excitatory amino acid receptor activity can be involved in numerous disease states. Therefore modulating the activity of receptors also refers to a variety of therapeutic applications, such as the treatment of cerebral ischemia, chronic neurodegeneration, psychiatric disorders, schizophrenia, mood disorders, emotion disorders, disorders of extrapyramidal motor function, obesity, disorders of respiration, motor control and function, attention deficit disorders, concentration disorders, pain disorders, neurodegenerative disorders, epilepsy, convulsive disorders, eating disorders, sleep disorders, sexual disorders, circadian disorders, drug withdrawal, drug addiction, compulsive disorders, anxiety, panic disorders, depressive disorders, skin disorders, retinal ischemia, retinal degeneration, glaucoma, disorders associated with organ transplantation, asthma, ischemia or astroytomas, and the like.
The compounds contemplated for use in accordance with of invention modulatory methods are especially useful for the treatment of mood disorders such as anxiety, depression, psychosis, drug withdrawal, tobacco withdrawal, memory loss, cognitive impairment, dementia, Alzheimer's disease, and the like; disorders of extrapyramidal motor function such as Parkinson's disease, progressive supramuscular palsy, Huntington's disease, Gilles de la Tourette syndrome, tardive dyskinesia, and the like.
Compounds contemplated for use in accordance with invention modulatory methods are also especially useful for the treatment of pain disorders such as neuropathic pain, chronic pain, acute pain, painful diabetic neuropathy, post-herpetic neuralgia, cancer-associated pain, pain associated with chemotherapy, pain associated with spinal cord injury, pain associated with multiple sclerosis, causalgia and reflex sympathetic dystrophy, phantom pain, post-stroke (central) pain, pain associated with HIV or AIDS, trigeminal neuralgia, lower back pain, myofacial disorders, migraine, osteoarthritic pain, postoperative pain, dental pain, post-burn pain, pain associated with systemic lupus, entrapment neuropathies, painful polyneuropathies, ocular pain, pain associated with inflammation, pain due to tissue injury, and the like.
"Contacting" may include contacting in solution or in solid phase.
"Pharmaceutically acceptable salt" refers to a salt of the compound used for treatment which possesses the desired pharmacological activity and which is physiologically suitable. The salt can be formed with organic acids such as acetate, adipate, alginate, aspartate, benzoate, benzenesulfonate, butyrate, citrate, camphorate, camphorsulfonate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, fumarate, glucoheptanoate, glycerophosphate, heptanoate, hexanoate, 2-hydroxyethanesulfonate, lactate, malate, maleate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, oxalate, tartrate, toluenesulfonate, undecanoate, and the like.
The salt can also be formed with inorganic acids such as sulfate, bisulfate, chlorate, perchlorate, hemisulfate, hydrochloride, hydrobromide, hydroiodide, and the like. In addition, the salt can be formed with a base salt, including ammonium salts, alkali metal salts such as sodium salts, potassium salts, and the like; alkaline earth metal salts such as calcium salts, magnesium salts, and the like; salts with organic bases such as dicyclohexylamine salts, N-methyl-D-glucamine, phenylethylamine, and the like;
and salts with amino acids such as arginine, lysine, and the like.
Salt forms of compounds herein find several advantages. Certain pharmaceutically acceptable salt forms of heterocyclic compounds described herein, achieve higher solubility as compared with non-salt forms. In addition, certain salt forms are more compatible with pharmaceutical uses. For example, the hydrochloric acid salt of 2-(phenylethynl)-1,3-thiazole is an oil while the toluene sulfonic acid salt form of 2-(phenylethynl)-1,3-thiazole is a solid that is soluble in aqueous medium. (See Example 187.) Characteristics of salt forms of compounds depend on the characteristics of the compound so treated, and on the particular salt employed.
In accordance with another embodiment of the invention, there are provided methods of modulating the activity of metabotropic glutamate receptors, said method comprising contacting metabotropic glutamate receptors with a concentration of a heterocylic compound as described above in accordance with invention methods for modulating the acitivity of excitatory amino acid receptors, sufficient to modulate the activity of said metabotropic glutamate receptors.
As used herein, the phrase "metabotropic glutamate receptor" refers to a class of cell-surface receptors which participates in the G-protein-coupled response of cells to glutamatergic ligands. Three groups of metabotropic glutamate receptors, identified on the basis of amino acid sequence homology, transduction mechanism and binding selectivity are presently known and each group contains one or more types of receptors. For example, Group I includes metabotropic glutamate receptors 1 and 5 (mGluR1 and mGluR5), Group II includes metabotropic glutamate receptors 2 and 3 (mGluR2 and mGluR3) and Group III includes metabotropic glutamate receptors 4, 6, 7 and 8 (mGluR4, mGluR6, mGluR7 and mGluR8). Several subtypes of each mGluR type may be found; for example, subtypes of mGluRl include mGluRla, mGluRlb and mGluRlc.
In accordance with another embodiment of the invention, there are provided methods of treating a wide variety of disease conditions, said method comprising administering to a patient having a disease condition a therapeutically effective amount of at least one of the heterocyclic compounds described above in accordance with invention methods for modulating the activity of excitatory amino acid receptors.
As used herein, "treating" refers to inhibiting or arresting the development of a disease, disorder or condition and/or causing the reduction, remission, or regression of a disease, disorder or condition. Those of skill in the art will understand that various methodologies and assays may be used to assess the development of a disease, disorder or condition, and similarly, various methodologies and assays may be used to assess the reduction, remission or regression of a disease, disorder or condition.
Disease conditions contemplated for treatment in accordance with the invention include cerebral ischemia, chronic neurodegeneration, psychiatric disorders, schizophrenia, mood disorders, emotion disorders, disorders of extrapyramidal motor function, obesity, disorders of respiration, motor control and function, attention deficit disorders, concentration disorders, pain disorders, neurodegenerative disorders, epilepsy, convulsive disorders, eating disorders, sleep disorders, sexual disorders, circadian disorders, drug withdrawal, drug addiction, compulsive disorders, anxiety, panic disorders, depressive disorders, skin disorders, retinal ischemia, retinal degeneration, glaucoma, disorders associated with organ transplantation, asthma, ischemia, astrocytomas, and the like.
Disease conditions contemplated for treatment in accordance with the present invention further include diseases of the pulmonary system, diseases of the nervous system, diseases of the cardiovascular system, diseases of the gastrointestinal system, diseases of the endocrine system, diseases of the exocrine system, diseases of the skin, cancer, diseases of the ophthalmic system, and the like.
As used herein, "administering" refers to means for providing heterocyclic compounds and/or salts thereof, as described herein, to a patient using oral, sublingual intravenous, subcutaneous, transcutaneous, intramuscular, intracutaneous, intrathecal, epidural, intraoccular, intracranial, inhalation, rectal, vaginal, and the like administration. Administration in the form of creams, lotions, tablets, capsules, pellets, dispersible powders, granules, suppositoiries, syrups, elixirs, lozenges, injectable solutions, sterile aqueous or non-aqueous solutions, suspensions or emulsions, patches, and the like, is also contemplated. The active ingredients may be compounded with non-toxic, pharmaceutically acceptable carriers including, glucose, lactose, gum acacia, gelatin, mannitol, starch paste, magnesium trisilicate, talc, corn starch, keratin, colloidal silica, potato starch, urea, dextrans, and the like.
For purposes of oral administration, tablets, capsules, troches, aqueous or oily suspensions, dispersible powders or granules, emulsions, hard or soft capsules, or syrups, elixirs and lozenges containing various excipients such as calcium carbonae, lactose, calcium phosphate, sodium phosphate, and the like may be employed along with various granulating and disintegrating agents such as corn starch, potato starch, alginic acid, and the like, together with binding agents such as gum tragacanth, corn starch, gelatin, acacia, and the like. Lubricating agents such as magnesium stearate, stearic acid, talc, and the like may also be added. Preparations intended for oral use may be prepared according to any methods known to the art for the manufacture of pharmaceutical preparations and such preparations may contain one or more agents selected from the group consisting of a sweetening agent such as sucrose, lactose, saccharin, and the lake, flavoring agents such as peppermint, oil of wintergreen, and the like, coloring agents and preserving agents in order to provide pharmaceutically palatable preparations.
Preparations for oral use may also contain suitable carriers include emulsions, solutions, suspensions, syrups, and the like, optionally containing additives such as wetting agents, emulsifying and suspending agents, sweetening, flavoring and perfuming agents, and the like. Tablets may be uncoated or they may be coated by known techniques to delay disintegration and absorption in the gastrointestinal tract and thereby provide a sustained action over a longer period of time.
For the preparation of fluids for parenteral administration, suitable carriers include sterile aqueous or non-aqueous solutions, suspensions, or emulsions. For parenteral administration, solutions for the practice of the invention may comprise sterile aqueous saline solutions, or the corresponding water soluble pharmaceutically acceptable metal salts, as previously described. For parenteral administration, solutions of the compounds used in the practice of the invention may also comprise non-aqueous solutions, suspensions, emulsions, and the like. Examples of non-aqueous solvents or vehicles are propylene glycol, polyethylene glycol, vegetable oils, such as olive oil and corn oil, gelatin, and injectable organic esters such as ethyl oleate. Such dosage forms may also contain adjuvants such as preserving, wetting, emulsifying, and dispersing agents. They may be sterilized, for example, by filtration through a bacteria-retaining filter, by incorporating sterilizing agents into the compositions, by irradiating the compositions, or by heating the compositions. They can also be manufactured in the form of sterile water, or some other sterile injectable medium immediately before use.
Aqueous solutions may also be suitable for intravenous, intramuscular, intrathecal, subcutaneous, and intraperitoneal injection. The sterile aqueous media employed are all readily obtainable by standard techniques well known to those skilled in the art. They may be sterilized, for example, by filtration through a bacteria-retaining filter, by incorporating sterilizing agents into the compositions, by irradiating the compositions, by heating the compositions, and the like. They can also be manufactured in the form of sterile water, or some other sterile medium capable of injection immediately before use.
Compounds contemplated for use in accordance with the present invention may also be administered in the form of suppositories for rectal or vaginal administration. These compositions may be prepared by mixing the drug with a suitable non-irritating excipient, such as cocoa butter, synthetic glyceride esters of polyethylene glycols, and the like, such materials being solid at ambient temperatures but liquify and/or dissolve in internal cavities to release the drug.
The preferred therapeutic compositions for inocula and dosage will vary with the clinical indication. Some variation in dosage will necessarily occur depending upon the condition of the patient being treated, and the physician will, in any event, determine the appropriate dose for the individual patient. The effective amount of compound per unit dose depends, among other things, on the body weight, physiology, and chosen inoculation regimen. A unit dose of compound refers to the weight of compound without the weight of carrier (when carrier is used).
The route of delivery of compounds and compositions used for the practice of the invention is determined by the disease and the site where treatment is required. Since the pharmacokinetics and pharmacodynamics of compounds and compositions described herein will vary somewhat, the most preferred method for achieving a therapeutic concentration in a tissue is to gradually escalate the dosage 5 and monitor the clinical effects. The initial dose, for such an escalating dosage regimen of therapy, will depend upon the route of administration.
In accordance with invention methods, the medicinal preparation can be introduced parenterally, by dermal application, and the like, in any medicinal form or composition. It is used as a solitary agent of medication or in combination with other medicinal preparations. Single and multiple 10 therapeutic dosage regimens may prove useful in therapeutic protocols.
As employed herein, the phrase "a therapeutically effective amount", when used in reference to invention methods employing heterocyclic compounds and pharmaceutically acceptable salts thereof, refers to a dose of compound sufficient to provide circulating concentrations high enough to impart a beneficial effect on the recipient thereof. The specific therapeutically effective dose level for any 15 particular patient will depend upon a variety of factors including the disorder being treated, the severity of the disorder, the activity of the specific compound used, the route of administration, the rate of clearance of the specific compound, the duration of treatment, the drugs used in combination or coincident with the specific compound, the age, body weight, sex, diet and general health of the patient, and like factors well known in the medical arts and sciences. Dosage levels typically fall in the range 20 of about 0.001 up to 100 mg/kg/day; with levels in the range of about 0.05 up to 10 mg/kg/day being preferred.
In still another embodiment of the invention, there are provided methods for preventing disease conditions in a subject at risk thereof, said method comprising administering to said subject a therapeutically effective amount of at least one of the heterocyclic compounds described above in 25 accordance with invention methods for modulating the activity of excitatory amino acid receptors.
As used herein, the phrase "preventing disease conditions" refers to preventing a disease, disorder or condition from occurring in a subject who may be at risk for the disease, but has not yet been diagnosed as having the disease. Those of skill in the art will understand that a variety of methods may be used to determine a subject at risk for a disease, and that whether a subject is at risk for a disease will depend on a variety of factors known to those of skill in the art, including genetic make-up of the subject, age, body weight, sex, diet, general health, occupation, exposure to environmental conditions, marital status, and the like, of the subject.
Those of skill in the art can readily identify a variety of assays that can be used to assess the activity of excitatory amino acid receptors. For receptor species that activate a second messenger pathway, assays that measure receptor-activated changes in intracellular second messengers can be employed to monitor receptor activity. For example, inhibition of G-protein-coupled metabotropic glutamate receptors by antagonists can lead to inhibition of the glutamate-evoked increase in phosphatidylinositol (PI) hydrolysis, which can be assessed by measuring decreases in glutamate-stimulated products of PI hydrolysis. (See e.g., Berridge et al, (1982) Biochem. J. 206:587-5950; and Nakajima et al., J Biol. Chem. 267:2437-2442 (1992) and Example 23.) Similarly, activation of excitatory amino acid receptors that leads to the release of intracellular calcium or changes in intracellular calcium concentration can also be used to assess excitatory amino acid receptor activity.
Methods of detection of transient increases in intracellular calcium concentration are well known in the art. (See e.g., Ito et al., J Neurochem. 56:531-540 (1991) and Example 22).
Furthermore, for receptor species that mediate analgesia, assays that measure analgesic efficacy can be employed to monitor receptor activity (See Example 24).
The following examples are intended to illustrate but not to limit the invention in any manner, shape, or form, either explicitly or implicitly. While they are typical of those that might be used, other procedures, methodologies, or techniques known to those skill in the art may alternatively be used.
Example 1 Synthesis of 2-(1-Cyclohexen-l-vlethynyl)-1,3-thiazole Triphenylphosphine (570 mg, 2.0 mmol) was dissolved in tetrahydrofuran (THF) (20 mL), then argon was bubbled through the solution for several minutes to deoxygenate if Palladium(II) acetate (120 mg, 0.54 mmol) was added, and the reaction mixture was heated to 60 C for 0.5 h, and then cooled to ambient temperature. Cu! (308 mg, 1.6 mmol), 2-bromo-1,3-thiazole (3.0 g, 18 mmol), 1-ethynylcyclohexene (2.4 g, 20 mmol), potassium carbonate (6 g, 45 mmol) and water (1.0 mL, 58 mmol) were dissolved in 50 mL dimethoxyether (DME) and argon was bubbled through the solution for several minutes to deoxygenate the mixture. The catalyst solution of triphenylphosphine and palladium (II) acetate in THE was added to the reaction flask which was heated to 75 C
for 2h. After 2 h, heating was discontinued and the reaction was allowed to cool to ambient temperature.
After stirring for 16 h, gas chromatography/mass spectrometry (GC/MS) analysis showed the reaction to be complete. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL) and washed with water (200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane then 97:3 hexane:ethyl acetate to afford 2-(1-cyclohexen-l-ylethynyl)-1,3-thiazole (2.56 g, 74%
yield) as a brown oil. 'H NMR
(CDC13, 300 MHz) 8 7.79 (d, J=3.0 Hz, 1H), 7.31 (d, J=3.0 Hz, 1H), 6.37-6.35 (m, 1H), 2.23-2.14 (m, 4H), 1.71-1.57 (m, 4H). MS (ESI) 190.0 (M+H).
Example 2 Synthesis of 2-Methyl-4-(1,3-thiazol-2-yll-3-butyn-2-ol 2-Bromo-1,3-thiazole (6.0 g, 37 mmol) and CuI (1.3 g, 7.3 mmol) were combined in DME (150 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture.
Triethylamine (25 mL, 180 mmol) and PdC12(PPh3)2 (2.5 g, 3.7 mmol) were added and 2-methyl-3-butyne-2-ol (4.6 g, 55 mmol) was added dropwise. After stirring at ambient temperature for 16 h, GC/MS showed the reaction was not complete. The reaction was heated to reflux for 2 h. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (600 mL), washed with water (600 mL), brine (600 mL), dried over Na2SO4, filtered and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane then 7:3 hexane:ethyl acetate to afford 4-(2-thiazolyl)-2-methyl-3-butyn-2-ol contaminated with 2,7-dimethyl-but-3,5-diyne-2,7-diol (the dimer of 2-methyl-3-butyne-2-ol). The product was crystallized from boiling hexane to afford 2-methyl-4-(1,3-thiazol-2-yl)-3-butyn-2-ol (2.18 g, 36% yield) as off white crystals that were contaminated with a small amount of 2,7-dimethyl-but-3,5-diyne-2,7-diol. M.p.
69-70 C. 'H NMR
(CDC13, 300 MHz) S 7.80 (d, J=3.0 Hz, 1H), 7.34 (d, J=3.0 Hz, 1H), 4.40 (s, 1H), 1.65 (s, 6H). MS
(ESI) 168.1 (M++H).
Example 3 Synthesis of 5-Chloro-3-pyridinyl trifluoromethanesulfonate Trifluoromethanesulfonic anhydride (5.0 mL, 30 mmol) was dissolved in CH2Cl2 (100 mL), and cooled to 0 C 5-Chloro-3-pyridinol (3.10 g, 23.9 mmol), and triethylamine (6.5 mL, 47 mmol) were dissolved in CH2C12 (50 mL), and the resulting solution was added to the cold trifluoromethanesulfonic anhydride solution dropwise via cannula. The resulting dark brownish-red solution was stirred at 0 C for 5 minutes, and then the ice bath was removed and the reaction mixture was allowed to warm to ambient temperature. After stirring for 16 h at ambient temperature the reaction was quenched by pouring into water and basified by addition of saturated aqueous sodium carbonate. The basic aqueous phase was extracted with CH2Cl2 (2 x 50 mL), the combined organics were then dried over Na2SO4, filtered and concentrated in vacuo. The resulting black viscous oil was filtered through a plug of silica gel and fractions were collected while eluting with 1:1 hexane:ethyl acetate. Fractions containing the desired product were combined, concentrated in vacuo, and further purified by column chromatography eluting with 15:1 then 10:1 hexane:ethyl acetate to afford 5-chloro-3-pyridinyl trifluoromethanesulfonate (3.68 g, 59% yield) as a golden liquid.
'H NMR (CDC13, 300 MHz) S 8.65 (d, J=2 Hz, 1H), 8.52 (d, J=2 Hz, 1H), 7.70 (t, J=3 Hz, 1H). MS
(ESI) 261 (M+, "Cl), 263 (M+, 31C1).
Example 4 Synthesis of 3-Chloro-5-f(trimethylsilyl)ethynylipyridine 5-Chloro-3-pyridinyl trifluoromethanesulfonate (4.0 g, 15 mmol) and Cul (580 mg, 3.0 mmol) were combined in DME (100 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (10.6 mL, 76.5 mmol), and PdC12(PPh3)2 (1.1g, 1.5 mmol) were added, then trimethylsilyl-acetylene (3.3 ml; 23 mmol) was added dropwise. The reaction mixture was stirred at ambient temperature for 1 h at which time GC/MS
analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 99:1 hexane:ethyl acetate to afford 3-chloro-5-[(trimethylsilyl)ethynyl]pyridine (2.8 g, 87% yield) as a brown solid. 'H NMR (CDC13, 300 MHz) 8 8.51 (s, 1H), 8.44 (s, 1H), 7.70(s, 1H), 0.22 (s, 9H). MS (EI ionization) 209 (M').
Example 5 Synthesis of 3-Chloro-5-ethynylpyridine 3-Chloro-5-[(trimethylsilyl)ethynyl]pyridine (1.4g, 6.7mmol) was dissolved in methanol (15 ml) and cooled to 0 C, to the resulting solution was added potassium carbonate (93 mg, 0.67 mmol).
The ice bath was removed and the reaction mixture was stirred at ambient temperature for 0.5 h at which time thin layer chromatography (TLC) and GC/MS analysis indicated that the reaction was complete. The solvent was removed in vacuo and the residue was dissolved in diethyl ether (50 mL), washed with water (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo to afford 3-chloro-5-ethynylpyridine (822mg, 90% yield) which was pure by GC/MS
analysis. MS (El ionization) 137 (35C1 M), 139 (37C1 M+). This material was carried on to the next step without further purification.
Example 6 Synthesis of 3-Chloro-5-(1.3-thiazol-2-ylethynyl)pyridine 2-Bromo-1,3-thiazole (980 mg, 6.0 mmol) and Cu! (230 mg, 1.2 mmol) were combined in DME (15 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (4.2 mL, 30 mmol) and PdC12(PPh3)2 (420 mg, 0.60 mmol) were added, then 3-chloro-5-ethynylpyridine (820 mg, 19 mmol) was added dropwise. After stirring at ambient temperature for 16 h, GC/MS analysis showed starting material remaining. The reaction mixture was heated at reflux for 2 h. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (100 mL), and washed with water (100 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 9:1 hexane:ethyl acetate to afford 3-chloro-5-(1,3-thiazol-2-ylethynyl)pyridine which contained some dimer. This material was crystallized from hot ethyl acetate to afford 3-chloro-5-(1,3-thiazol-2-ylethynyl)pyridine (300 mg 23% yield) as light orange crystals M.p. 124-125 C. 'H
NMR (CDC13, 300 MHz) 6 8.70 (d, J=1.5 Hz, 1H), 8.59 (d, J=3.0 Hz, 1H), 7.93 (d, J=3.0 Hz, 1H), 7.88 (t, J=2.0 Hz, I H), 7.48 (d, J=3.0 Hz, 2H). MS (ESI) 221.1 (M++H).
Example 7 Synthesis of 2-(Cyclohexylethynyl)-1,3-thiazole 2-Bromo-l,3-thiazole (3.1 g, 19 mmol) and CuI (290 mg, 1.5 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (13 mL, 95 mmol) and PdC12(PPh3)2 (530 mg, 0.76 mmol) were added and cyclohexylethyne (2.0 g, 19 mmol) was added dropwise. The reaction mixture was stirred at ambient temperature for 16 h at which time GC/MS analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane then 99:1 hexane:ethyl acetate to afford 2-(cyclohexylethynyl)-1,3-thiazole (1.6 g, 44% yield) as a yellow oil. 'H NMR
(CDC13, 300 MHz) S 7.76 (d, J=9.0 Hz, 1H), 7.28 (d, J=3.0 Hz, 1H), 2.68-2.59 (m, 1H), 1.91-1.28 (m, 1OH). MS (ESI) 191.7 (M).
Example 8 Synthesis of 2-(1-Pentynyl)-1,3-thiazole 2-Bromo-1,3-thiazole (2.0 g, 12 mmol) and Cu! (183 mg, 0.96 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8 mL, 60 mmol) and PdC12(PPh3)2 (337 mg, 0.48 mmol) were added and 1-pentyne (979 mg, 14.4 mmol) was added dropwise. The reaction mixture was stirred at ambient temperature for 6 h at which time GC/MS analysis indicated that the reaction was not complete.
Additional 1-pentyne (3.0 mL, 29 mmol) was added and the reaction was heated to 35 C under a condenser. After heating for 16 h, GC/MS analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane, 99:1, then 97:3 hexane:ethyl acetate to 2-(1-pentynyl)-1,3-thiazole (820 mg, 44% yield) as a yellow oil. 'H
NMR (CDC13, 300 MHz) S 7.76 (d, J=3.0 Hz, 1H), 7.28 (d, J=3.0 Hz, 1H), 2.47-2.42 (m, 2H), 1.68-1.60 (m, 2H), 1.08 - 0.99 (m, 3H). MS (ESI) 151.6 (M+).
Example 9 5 Synthesis of 2-(3-Cyclohexyl-l-propynyl)-1,3-thiazole 2-Bromo-1,3-thiazole (2.0 g, 12 mmol) and Cul (185 mg, 0.97 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.5 mL, 61 mmol) and PdC12(PPh3)2 (340 mg, 0.49 mmol) were added and 3-cyclohexyl-l- propyne (2.9 g, 24 mmol) was added dropwise. The reaction was stirred at ambient 10 temperature for 16 h at which time GC/MS analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane, then 98:2 hexane:ethyl 15 acetate to afford 2-(3-cyclohexyl-l-propynyl)-1,3-thiazole (1.14 g, 46%
yield) as a yellow oil. 'H NMR
(CDC13, 300 MHz) S 7.76 (d, J=3.0 Hz, 1H), 7.27 (d, J=3.0 Hz, 1H), 2.35 (d, J=6 Hz, 2H), 1.89-1.61 (m, 5H), 1.3 - 1.03 (m, 6H). MS (ESI) 205.9 (M++H).
Example 10 Synthesis of 2-(1-Cyclohexen-l-vlethynyl)-5-nitro-1,3-thiazole 20 2-Bromo-5-nitro-1,3-thiazole (2.5 g, 12 mmol) and Cul (460 mg, 2.5 mmol) were combined in DME (30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.4 mL, 60 mmol) and PdC12(PPh3)2 (840 mg, 1.2 mmol) were added and 1-ethynycyclohexene (1.5 g, 14.4 mmol) was added dropwise. The reaction was heated under reflux for 16 h at which time GC/MS analysis indicated that the reaction was complete.
The mixture was filtered 25 through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, 99:1 then 98.5:1.5 hexane:ethyl acetate to afford 2-(1-cyclohexen-l-ylethynyl)-5-nitro-1,3-thiazole (1.4 g, 51.8% yield) as a yellow powder. M.p.
30 85-86 C. 'H NMR (CDC13, 300 MHz) S 8.5 (s, 1H), 6.52 (br s, 1H), 2.24 (br s, 4H), 1.63 (br s, 4H). MS
(ESI) 235.1 (M++H).
Example 11 Synthesis of 2-(3,3-Dimethyl-l-butynyl)-1,3-thiazole Triphenylphosphine (380 mg, 1.5 mmol) was dissolved in THE (20 mL), then argon was bubbled through the solution for several minutes to deoxygenate it.
Palladium(II) acetate (82 mg, 0.37 mmol) was added, and the reaction mixture was heated to 60 C for 0.5 h, and then cooled to ambient temperature. Cul (210 mg, 1.1 mmol), 2-bromo-1,3-thiazole (1.6 g, 9.8 mmol), potassium carbonate (4.2 g, 31 mmol) and water (0.70 mL, 39 mmol) were dissolved in DME (30 mL) and argon was bubbled through the mixture for several minutes to deoxygenate the mixture.
3,3-dimethyl-I-butyne (1.0 g, 12.2 mmol) was then added to mixture. The catalyst solution of triphenylphosphine and palladium (II) acetate in THE was added to the reaction flask which was heated to 30 C for 2h. After this time heating was discontinued and the mixture was allowed to stir at ambient temperature. After stirring for 16 h, GC/MS analysis showed the reaction to be complete. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with water (200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, then 99:1 hexane:ethyl acetate to afford 2-(3,3-dimethyl-l-butynyl)-1,3-thiazole (0.45 g, 28% yield) as a yellow oil. 'H
NMR (CDC13, 300 MHz) S 7.74 (d, J=3.0 Hz, IH), 7.28 (d, J=3.0 Hz, 1H), 1.33 (s, 9H). MS (ESI) 166.1 (M++H).
Example 12 Synthesis of 1-(1,3-Thiazol-2-ylethynyl)cyclopentanol 2-Bromo-1,3-thiazole (3.1 g, 19 mmol) and Cul (360 mg, 1.9 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (13 mL, 94 mmol) and PdC12(PPh3)2 (660 mg, 0.94 mmol) were added and 1-ethynycyclopentanol (2.5 g, 23 mmol) was added dropwise. The reaction was heated at 50 C for 16 h at which time GC/MS analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate.
The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, 6:1 then 3:1 hexane:ethyl acetate to afford 1-(1,3-thiazol-2-ylethynyl)cyclopentanol (2.3 g, 52% yield) as a yellow powder. 'H NMR (CDC13, 300 MHz) 8 7.80 (d, J=3 Hz, 1H), 7.65 (d, J=3 Hz, 1H), 2.04-1.73 (m, 10.8H). MS
(EI ionization) 193 (M+).
Example 13 Synthesis of 2-(1-Cyclopenten-l-ylethynyl)-1,3-thiazole 1-(1,3-Thiazol-2-ylethynyl)cyclopentanol was dissolved in pyridine (20 ml) and phosphorus oxychloride (1.2 g, 6.2 mmol) was added dropwise under argon. The reaction was stirred at ambient temperature for lh at which time a precipitate had appeared. At this time GUMS
analysis indicated that the reaction was complete and the pyridine was removed in vacuo. The residue was dissolved in ethyl acetate (200 mL) and washed with water (200 mL), brine (200 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 99:1 hexane:ethyl acetate to 2-(1-cyclopenten-1-ylethynyl)-1,3-thiazole (0.25 g, 24% yield) as a light brown solid. M.p. 70.5-72 C, 'H NMR (CDC13, 300 MHz) S 7.80 (d, J=3.0 Hz, 1H), 7.34 (d, J=3.OHz, 1H), 6.31-6.30 (m, 1H), 2.60-2.45 (m, 4H), 2.00-1.90 (m, 2H). MS
(ESI) 176.1 (M++H).
Example 14 Synthesis of Methyl 3-(1,3-thiazol-2-yl)-2-propynyl ether 2-Bromo-1,3-thiazole (2.0 g, 12 mmol) and Cul (456 mg, 2.4 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.6 mL, 60 mmol) and PdC12(PPh3)2 (842 mg, 1.2 mmol) were added and methyl propargyl ether (1.00 g, 14.4 mmol) was added dropwise. The reaction was stirred at 55 C
under a condenser. After stirring at 55 C for 16 h, GC/MS analysis indicated that the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo and the residue was dissolved in ethyl acetate (300 mL), washed with water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, 99:1, 97:3, then 96:4 hexane:ethyl acetate to afford methyl 3-(1,3-thiazol-2-yl)-2-propynyl ether (250 mg, 13% yield) as a yellow oil. 'H NMR (CDC13, 300 MHz) S 7.78 (d, J=3.0 Hz, 1H), 7.37 (d, J=3.0 Hz, IH), 4.37 (s, 2H), 3.47 (s, 3H). MS (ESI) 154.1 (M++H).
Example 15 Synthesis of 2-Methyl-4-(3-pyridinyl)-3-butyn-2-ol 3-Bromopyridine (3.0 mL, 31 mmol), triethylamine (22 mL, 160 mmol), Cu! (1.2 g, 6.2 mmol), and PdC12(PPh3)2 (1.1 g, 1.5 mmol) were combined in DME (92 mL) and cooled to 0 C. 2-Methyl-3-butyne-2-ol (9.0 mL, 93 mmol) was then added and the reaction was allowed to slowly warm to ambient temperature. The mixture was then heated to 55-60 C for 16 h. The mixture was filtered through CeliteTM, and the pad was washed thoroughly with ethyl acetate. The combined filtrates were washed with brine (3 x 100 mL), dried over MgSO4i and filtered. The solution was concentrated in vacuo, and the residue was purified by column chromatography eluting with 90:10 hexane:ethyl acetate then ethyl acetate to afford 2-methyl-4-(3-pyridinyl)-3-butyn-2-ol (2.0 g, 40%
yield) as a brown oil 'H
NMR (CDC13, 300 MHz) S 8.76 (br s, 1H), 8.52 (br s, 1H), 7.74-7.70 (m, 1H), 4.08 (br s, 1H), 1.63 (s, 3H). MS (EI ionization) 161 (M).
Example 16 Synthesis of 3-Ethynylpyridine 2-Methyl-4-(3-pyridinyl)-3-butyn-2-ol (611 mg, 3.79 mmol) was dissolved in toluene (12 mL) at ambient temperature. A small amount (spatula tip) of NaH (60% dispersion in mineral oil) was added, and the reaction was heated to reflux. After 15 minutes the reaction was cooled to ambient temperature, and quenched by the addition of 1M aqueous HC1 (30 mL). Crude product from a previous preparation (-200 mg) was added to the workup mixture. The acidic aqueous was extracted with ethyl acetate (2 x 20 mL), basified by the addition of saturated aqueous NaHCO3, and extracted with CH2CI2. The CH2CI2 extracts were dried over MgSO4i filtered, and concentrated in vacuo to afford crude 3-ethynylpyridine (1.5 g, >100%) as a brown liquid., 'H NMR
(CDC13, 300 MHz) S 8.73 (br s, 1H), 8.58 (br s, 1H), 7.80-7.76 (m, 1H), 7.29-7.16 (m, 1H), 3.28 (s, 1H). A portion of this material was carried on to the next step without further purification.
Example 17 Synthesis of 3-(1,3-Thiazol-2-ylethynyl)pyridine 2-Bromo-1,3-thiazole (0.15 mL, 1.6 mmol), Cu! (98 mg, o.51 mmol), PdC12(PPh3)2 (120 mg, 0.17 mmol) and triethylamine (2.8 mL, 20 mmol) were combined in DMF (6.8 mL) and cooled in an ice bath. 3-Ethynylpyridine (520 mg, 5.04 mmol) was then added to the mixture as a solution in DMF
(3.0 mL). The ice bath was removed and the reaction was allowed to stir at ambient temperature for 16 h. The reaction mixture was filtered through a pad of CeliteTM, and the pad was washed thoroughly with ethyl acetate. The filtrate was washed with brine (3 x 20 mL). A partial emulsion was observed.
The mixture was concentrated in vacuo and the residue was taken up in CH2C12, washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 80:20 followed by 30:20 hexane:ethyl acetate to afford 3-(1,3-thiazol-2-ylethynyl)pyridine (160 mg) as a mixture with another product exhibiting a mass of 204 in the GCIMS, assigned as pyridylalkyne dimer. A portion of the mixture (100 mg) was further purified by preparative reverse-phase HPLC eluting with a gradient of 80:20 to 0:100 water:acetonitrile over twenty minutes. The fractions containing the desired product were collected (detection by uv at 210 nm) to afford 3-(1,3-thiazol-2-ylethynyl)pyridine as a white waxy solid (15 mg). 'H NMR (CDC13, 300 MHz) 8 9.3-8.5 (br s, 2 H), 7.92-7.90 (m, 2H), 7.50-7.30 (m, 2H). MS (ESI) 187.0 (M++H).
Example 18 Synthesis of 3,3.5.5-Tetramethyl-l-(2-pyridinylethynyl)cyclohexanol.
To a solution of 2-ethynylpyridine (1.0 g, 10 mmol) in THE at -78 C was added a 1.0 M
solution of ethyl magnesium bromide in THE (10 mL, 10 mmol). After stirring at reduced temperature for 30 minutes a solution of 3,3,5,5-tetramethylcyclohexanone (1.5 g, 10 mmol) in THE was added rapidly. The mixture was allowed to warm to ambient temperature over 16 hours, then partitioned between water and ethyl acetate. The organic layer was dried over anhydrous Na2SO4, and concentrated in vacuo. The resultant product was purified by flash column chromatography on silica gel eluting with 1:1 hexane:ethyl acetate to afford 3,3,5,5-tetramethyl-l-(2-pyridinylethynyl)cyclohexanol (250 mg, 10% yield) as a white solid. M.p.
126-127 C. 'H NMR
(DMSO-d6, 300 MHz) S 8.57 (m, 1H), 7.64 (m, 1H), 7.39 (d, J=5 Hz, 1H), 7.22 (m, 1H), 1.91 (d, J=9 Hz, 2H), 1.71 (d, J=9 Hz, 2H), 1.26 (s, 2H), 1.14 (s, 6H), 1.09 (s, 6H).
Example 19 Synthesis of 2-[(3.3 5,5-Tetramethyl-l-cyclohexen-1-yl)ethynyllpyridine 3,3,5,5-Tetramethyl-l-(2-pyridinylethynyl)cyclohexanol (200 mg, 0.78 mmol) was dissolved in pyridine. POC13 (153 mg, 1.0 mmol) was added, and the mixture was heated to reflux for 6 h. After cooling, the POC13 and pyridine were removed in vacuo. The residue was purified by flash column chromatography on silica gel eluting with 2:1 hexane:ethyl acetate to afford 2-[(3,3,5,5-tetramethyl-l-cyclohexen-l-yl)ethynyl]pyridine (148 mg, 80% yield) as a light tan solid.
M.p. 55-56 C. 'H NMR
(CDC13, 300 MHz) 8 8.56 (m, 1H), 7.62 (m, 1H), 7.40 (d, J=7 Hz, 1H), 7.18 (m, 1H), 6.09 (s, 1H), 2.00 (s, 2H), 1.35 (s, 2H), 1.05 (s, 6H), 0.99 (s, 6H).
Example 20 Synthesis of 2-[(5-Methyl-l-cyclohexen-1-yIlethynyl]pyridine and 2-[(3-methyl-l-cyclohexen-1-yl)ethynyllpyridine (111) Using the procedures for Examples 18 and 19 but with the appropriate starting materials, 2-[(5-methyl-l-cyclohexen-1-yl)ethynyl]pyridine and 2-[(3-methyl-l-cyclohexen-1-yl)ethynyl]pyridine were obtained as a mixture of racemic regioisomers. 'H NMR (CDC13, 300 MHz) 8 8.56 (m, 1H), 7.62 (m, 1H), 7.40 (m, 1H), 7.19 (m, 1H), 6.32 (s, 0.5H), 6.20 (s, 0.5 H), 2.25 (m, 3H), 1.73 (m, 3H), 1.22 (m, 1H), 1.01 (m, 3H). MS (EI ionization) Two peaks: 197 (M).
Example 21 General procedure for 2-pyridylenynes To a cooled a solution of 2-ethynylpyridine in THE to -78 C was added n-BuLi (1.6 M in hexane, 1 equiv). After 20 minutes stirring at reduced temperature this material was mixed with a 5 solution of the appropriate ketone (1 equiv) in THF. The solution was allowed to warm slowly to ambient temperature. The reaction mixture was then quenched and partitioned between water and ethyl acetate. The organic layer was dried over Na2SO4, and concentrated in vacuo.
The resultant product was purified by flash column chromatography on silica gel eluting with 1:1 hexane:ethyl acetate. The resulting product was dissolved in pyridine or a mixture of pyridine and methylene chloride (1:1).
10 POC13 (1.2 equiv) was added and the solution refluxed for 4 to 8 hours. The resultant mixture was partitioned between IM K2CO3 and ethyl acetate. The organic layer was dried over Na2SO4, and concentrated in vacuo. The resultant product was purified by flash column chromatography on silica gel eluting with 2:1 hexane:ethyl acetate.
Using this general procedure the following invention compounds (see Examples 22-33) were 15 obtained.
Example 22 Synthesis of 2-[(4-Methyl-l-cyclopenten-1-yl)ethynyl]pyridine and 2- [ -Methyl-1-cyclopenten-l-yl ethynyllpyridine (1:1) Reactants: 2-ethynylpyridine (620 mg, 6.0 mmol), 3-methylcyclopentanone (0.64 mL, 6.0 20 mmol); yields 2-[(4-methyl-l-cyclopenten-1-yl)ethynyl]pyridine and 2-[(3-methyl-l-cyclopenten-l-yl)ethynyl]pyridine (1:1) as a transparent oil (200 mg, 18% overall yield), as mixture of regio- and stereoisomers. 'H NMR (CDC13, 300 MHz) 8 8.56 (m, 1H), 7.64 (m, 1H), 7.44 (m, 1H), 7.20 (m, 1H), 6.19 (m, 0.5H), 6.18 (m, 0.5H), 2.90 (m, 0.5H), 2.70 (m, 2.5H), 2.21 (m, 2H), 1.48 (m, 0.5H), 1.08 (app d, J= 7.5Hz, 3H). Two peaks: 182 (W), 167 (M+-Me).
25 Example 23 Synthesis of 2-(Bicyclo[ .2.llhept-2-en-2-ylethynyl)pyridine Reactants: 2-ethynylpyridine (1.0 g, 10.0 mmol), norcamphor (1.1 g, 10.0 mmol); yields 2-(bicyclo[2.2.1]hept-2-en-2-ylethynyl)pyridine as a black oil (215 mg, 11% over two steps). This material was mixed with fumaric acid (128 mg, 1.11 mmol), dissolved in Methanol and the resulting 30 solution was concentrated in vacuo to afford a dark brown solid. This was triturated with a mixture of ethyl acetate:ethanol (1:1) and the resultant solids were partitioned between aqueous K2CO3 and ethyl acetate. The organics were dried over Na2SO4, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with 2:1 hexane:ethyl acetate to afford 2-(bicyclo[2.2.1 ]hept-2-en-2-ylethynyl)pyridine (30 mg, 1.5 % overall yield) as a translucent brown oil.
'H NMR (DMSO-d6, 300 MHz) 8 8.58 (d, J= 5Hz, 1H), 7.64 (m, 1H), 7.40 (m, 1H), 7.19 (m, 1H), 6.48 (d, J=4Hz, 1H), 3.07 (s, 1H), 2.97 (s, 1H), 1.76 (m, 2H), 1.51 (m, 1H), 1.23 (m, 1H), 1.11 (m, 1H). MS
(EI ionization) 195 (M+).
Example 24 Synthesis of 2-[(2.6-Dimethyl-1-cyclohexen-1-yl)ethynyl]pyridine Reactants: 2-ethynylpyridine (5.0 mmol, 515 mg), 2,6-dimethylcyclopentanone (6.0 mmol, 0.82 mL); yields 2-[(2,6-dimethyl-l-cyclohexen-1-yl)ethynyl]pyridine as a transparent oil (200 mg, 19% overall yield). 'H NMR (CDC13, 300 MHz) 8 8.56 (m, 1H), 7.60 (m, 1H), 7.42 (m, 1H), 7.19 (m, 1H), 2.40 (m, 1H), 2.10 (m, 2H), 2.01 (s, 3H), 1.76 (m, 2H), 1.56 (m, 1H), 1.34 (m, 1H), 1.22 (app d, J= 7 Hz, 3H). MS (EI ionization) 211 (M).
Example 25 Synthesis of 2-(1-Cyclohepten-1-ylethynyl)pyridine Reactants: 2-ethynylpyridine (5.0 mmol, 515 mg), cycloheptanone (6.0 mmol, 0.71 mL); yields 2-(1-cyclohepten-1-ylethynyl)pyridine as a transparent oil (200 mg, 18%
overall yield). 'H NMR
(CDC13, 300 MHz) 8 8.54 (m, 1H), 7.59 (m, 1H), 7.40 (m, 1H), 7.16 (m, 1H), 6.52 (t, J= 7 Hz, 1H), 2.47 (m, 2H), 2.26 (m, 2H), 1.77 (s, 2H), 1.61 (m, 2H), 1.56 (m, 2H). MS (EI
ionization) 197 (M1).
Example 26 Synthesis of 2-(1-Cycloocten-1-ylethynyl)pyridine Reactants: 2-ethynylpyridine (515 mg, 5.0 mmol), cyclooctanone (756 mg, 6.0 mmol); yields 2-(1-cycloocten-1-ylethynyl)pyridine as a transparent oil (250 mg, 24% overall yield).'H NMR (CDC13, 300 MHz) 6 8.57 (m, 1H), 7.62 (m, 1H), 7.40 (m, 1H), 7.18 (m, 1H), 6.33 (t, J=
7 Hz, IH), 2.41 (m, 2H), 2.23 (m, 2H), 1.66 (s, 2H), 1.52 (br m, 6H). MS (EI ionization) 211 (M).
Example 27 Synthesis of 2-[(4-Methyl-l-cyclohexen-1-yl)ethynyl]pyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), 4-methylcyclohexanone (6.0 mmol, 672 mg); yields 2-[(4-methyl-l-cyclohexen-1-yl)ethynyl]pyridine as a transparent oil (250 mg, 21% overall yield). 'H NMR (CDC13, 300 MHz) 6 8.57 (m, 1H), 7.59 (m, 1H), 7.39 (m, 1H), 7.20 (m, 1H), 6.30 (m, 1H), 2.22 (m, 3H), 1.72 (m, 3H), 1.25 (m, 1H), 0.99 (m, 3H). MS (EI
ionization) 197 (M).
Example 28 Synthesis of 2-(3,6-Dihydro-2H-thiopyran-4-ylethynyl)pyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), tetrahydrothiopyran-4-one (6.0 mmol, 696 mg); yields 2-(3,6-dihydro-2H-thiopyran-4-ylethynyl)pyridine as a transparent oil (150 mg, 12%
overall yield). 'H NMR (CDC13, 300 MHz) S 8.57 (m, 1H), 7.61 (m, 1H), 7.40 (m, 1H), 7.21 (m, 1H), 6.46 (m, 1H), 3.27 (m, 2H), 2.78 (m, 2H), 2.57 (m, 2H). MS (EI ionization) 201 (M).
Example 29 Synthesis of 2 X3.6-Dihydro-2H-pyran-4-ylethynyl)pyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), tetrahydro-4H-pyran-4-one (6.0 mmol, 600 mg); yields 2-(3,6-dihydro-2H-pyran-4-ylethynyl)pyridine as a transparent oil (200 mg, 18% overall yield). 'H NMR (CDC13i 300 MHz) 8 8.57 (m, 1H), 7.63 (m, 1H), 7.44 (m, 1H), 7.21 (m, 1H), 6.29 (m, 1H), 4.25 (m, 2H), 3.81 (m, 2H), 2.36 (m, 2H). MS (EI ionization) 185 (M+).
Example 30 Synthesis of 2-{[(1R)-1,7,7-Trimethylbicyccl [2 2.11 heat-2en-2-yl]ethynl}pyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), (1R)-(+)-camphor (6.0 mmol, 912 mg);
yields 2-{[(1R)-1,7,7-trimethylbicyclo[2.2.1]hept-2-en-2-yl]ethynyl}pyridine as a transparent yellow oil (125 mg, 9% overall yield). 'H NMR (CDC13, 300 MHz) 6 8.57 (m, 1H), 7.64 (m, 1H), 7.43 (m, 1H), 7.17 (m, 1H), 6.49 (d, J= 3Hz, 1H), 2.41 (t, J= 3Hz, 1H), 1.92 (br m, 1H), 1.65 (m, 1H), 1.18 (m, 1H), 1.17 (s, 3H), 1.09 (br m, 1H), 0.84 (s, 3H), 0.82 (s, 3H). MS (El ionization) 237 (M).
Example 31 Synthesis of 2- [(3.5-Dimethyl-l-cyclohexen-l-y1)ett ynyllpyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), 3,5-dimethylcyclohexanone (6.0 mmol, 0.85 mL); yields 2-[(3,5-dimethyl-l-cyclohexen-1-yl)ethynyl]pyridine as a transparent yellow oil (500 mg, 39% overall yield) as a mixture of diastereomers.'H NMR (CDC13, 300 MHz) 6 8.57 (m, 1H), 7.62 (m, 1 H), 7.40 (m, 1 H), 7.19 (m, 1 H), 6.15 (br s, 1 H), 2.29 (m, 2H), 1.80 (br m, 2H), 1.00 (m, 6H), 0.88 (br m, 2H). MS (El ionization) 211 (M).
Example 32 Synthesis of 2-{[(5R)-5-Methyl-l-cvclohexen-1-yllethynyl}pyridine compound with 2-{f(3R)-3-methyl-l-cvclohexen-l-yllethynyl}pyridine (1:1) Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), (3R)-(+)-3-methylcyclohexanone (6.0 mmol, 0.73 mL); yields 2-{[(5R)-5-methyl-l-cyclohexen-1-yl]ethynyl}pyridine and 2-{[(3R)-3-methyl-l-cyclohexen-1-yl]ethynyl}pyridine (1:1) as a transparent yellow oil (440 mg, 37% overall yield) as a mixture of regioisomers. 'H NMR (CDC13i 300 MHz) 58.56 (m, 1H), 7.62 (m, 1H), 7.40 (m, 1H), 7.18 (m, 1H), 6.31 (m, 0.5H), 6.19 (m, 0.5H), 2.30 (m, 3H), 1.85 (m, 2.5H), 1.22 (m, 1H), 0.98 (m, 3.5H).
MS (El ionization) 197 (M) two peaks resolved.
Example 33 Synthesis of 2-f(3E)-3-Methyl-3-penten-l-vnvllpyridine, 2-(3-ethyl-3-buten-l-ynyl)pyridine and 2-f (3Z)-3-methyl-3-penten-l-ynyllpyridine Reactants: 2-ethynylpyridine (6.0 mmol, 618 mg), 2-butanone (6.0 mmol, 0.54 mL); yields 2-[(3E)-3-methyl-3-penten-1-ynyl]pyridine, 2-(3-ethyl-3-buten-1-ynyl)pyridine and 2-[(3Z)-3-methyl-3-penten-1-ynyl]pyridine as a transparent oil (135 mg, 14% overall yield) as a mixture of E, Z and exo-methylene isomers. 'H NMR (CDC13, 300 MHz) 58.59 (m, 1H), 7.65 (m, 1H), 7.44 (m, 1H), 7.20 (m, 1H), 5.88 (m, 0.75H), 5.53 (s, 0.33H) 5.40 (s, 0.33 H), 2.29 (q, J= 7Hz, 0.65H), 1.93 (m, 4.5H), 1.17 (t, J= 714z, 1 H). MS (El ionization) 157 (M+) two peaks resolved.
Example 34 Synthesis of 5-Ethyl-2-(phenylethynyl)pyrimidine hydrochloride 2-Chloro-5-ethylpyrimidine (500 mg, 3.5 mmol), PdC12(PPh3)2 (250 mg, 0.35 mmol), Cul (203 mg, 1.06 mmol), triethylamine (6.0 mL, 43 mmol), and n-Bu4NI (3.85 g, 10.4 mmol) were combined in dimethylformamide (DMF) (30 mL). The mixture was cooled in an ice bath and then phenylacetylene (1.5 mL, 14 mmol) was added. The reaction mixture was then heated to 45-50 C
and after 1.5 h, additional phenylacetylene (1.5 mL, 14 mmol) was added. After an additional 17 h the reaction was diluted with ethyl acetate, washed with brine (4 x 15 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The resulting black oil was purified by column chromatography eluting with hexane then 90:10 hexane:ethyl acetate to afford 5-ethyl-2-(phenylethynyl)pyrimidine (770 mg, >100%) as a black oil. MS (El ionization) 208 (M). This material was carried on to the salt formation without further purification.
5-Ethyl-2-(phenylethynyl)pyrimidine (730 mg, 3.7 mmol) was dissolved in CH2C12 (3.0 mL) and treated with HCI in diethyl ether (4.1 mL of a IN solution, 4.1 mmol).
Upon addition of the HCI
solution a solid precipitated from the solution. The mixture was diluted with diethyl ether (2 mL) and the supernatant decanted. The resultant solid was dried under high vacuum at 50 C to afford 5-ethyl-2-(phenylethynyl)pyrimidine hydrochloride (450 mg, 49 % yield) as an orange solid. M.p. 101-104 C. 'H
NMR (CD3OD, 300 MHz) S 8.75 (s, 2H), 7.58-7.55 (m, 2H), 7.41-7.32 (m, 3H), 2.67 (q, J=7.6 Hz, 2H), 1.21 (t, J=7.6 Hz, 3H).
Example 35 Synthesis of 4,6-Dimethoxy-2-(phenylethynyl)pyrimidine hydrochloride 2-Chloro-4,6-dimethoxypyrimidine (500 mg, 2.9 mmol), PdC12(PPh3)2 (200 mg, 0.28 mmol), CuI (160 mg, 0.84 mmol), triethylamine (4.8 mL, 34 mmol), and n-Bu4NI (3.2 g, 8.7 mmol) were combined in DMF (24 mL). The mixture was cooled in an ice bath and then phenylacetylene (1.25 mL, 11.4 mmol) was added. The reaction mixture was allowed to warm to ambient temperature. After 2.5 h at ambient temperature the reaction mixture was heated to 45-50 C. After 2 h, additional phenylacetylene (1.0 mL, 9.1 mmol) was added. After an additional 17 h stirring at 45-50 C, the reaction mixture was filtered through a pad of CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were washed with brine (4 x 20 mL), dried over MgSO4, filtered and concentrated in vacuo. The resulting black oil was purified by column chromatography eluting with hexane, 90:10, then 85:15 hexane:ethyl acetate to afford product contaminated with an impurity.
Careful column chromatography of this impure material eluting with hexane then 90:10 hexane:ethyl acetate afforded 4,6-dimethoxy-2-(phenylethynyl)pyrimidine (320 mg, 46% yield) as a yellow solid.
This material was carried on to the salt formation without further purification.
4,6-Dimethoxy-2-(phenylethynyl)pyrimidine (320 mg, 1.3 mmol) was dissolved in CH2C12 (1.0 mL), and treated with HC1 in diethyl ether (1.6 mL of a 1.OM solution, 1.6 mmol). A yellow solid precipitated immediately. The mixture was diluted with ethyl acetate and allowed to stand in the freezer for 16 h. The cold supernatant was decanted and the remaining solids were triturated with ethyl acetate (1.5 mL), and then hexane (3 x 2 mL). The remaining solid was dried in vacuo to afford 4,6-dimethoxy-2-(phenylethynyl)pyrimidine hydrochloride (174 mg, 47 % yield) as a yellow solid. M.p.
137-138. 'H NMR (CD3OD, 300 MHz) S 7.65-7.62 (m, 2H), 7.46-7.42 (m, 3H), 6.16 (s, 1H), 3.97 (s, 6H).
Example 36 Synthesis of 2-[(E)-2-(3-Fluorophenyl)ethenyll-6-methylpyrazine 2,6-Dimethylpyrazine (5.0 g, 46 mmol) was dissolved in THE (200 mL) and cooled to 0 C.
Potassium t-butoxide (46 mL of a 1.OM solution in THF, 46 mmol) was added to afford a dark red solution. The solution was allowed to warm to ambient temperature and stir for 1 hr. The solution was then cooled to 0 C, and 3-fluorobenzaldehyde (4.9 mL, 46 mmol) was added via syringe pump over 2 h. The reaction was then allowed to slowly warm to ambient temperature. After stirring at ambient temperature for 18 h, the reaction mixture was cooled to 0 C and quenched by the addition of concentrated aqueous HCl (10 mL). The resulting suspension was allowed to warm to ambient temperature for 15 minutes, then cooled to 0 C and brought to pH=8 by addition of solid NaHCO3. The 5 layers were separated, and the aqueous layer was extracted with ethyl acetate (3 x 200 mL). The combined organic layers were washed with brine (200 mL), dried over MgSO4i filtered, and concentrated in vacuo. The crude product was purified by column chromatography eluting with 90:10, 85:15, then 80:20 hexane:ethyl acetate to afford 2-[(E)-2-(3-fluorophenyl)ethenyl]-6-methylpyrazine (4.14 g, 42% yield) as a light yellow solid. M.p. 43-44 C. 'H NMR (CDC13, 300 MHz) S 8.44 (s, 1H), 10 8.31 (s, 1H), 7.29 (d, J=16 Hz, 1H), 7.37-7.26 (m, 3H), 7.12 (d, J=16 Hz, 1H), 7.05-6.98 (m, 1H), 2.59 (s, 3H). MS (ESI) 214.5 (M+). This material was carried on to the next step without further purification.
Example 37 Synthesis of 2-[1,2-Dibromo-2-(3-fluorophenyl)ethyll-6-methylpyrazine 2-[(E)-2-(3-Fluorophenyl)ethenyl]-6-methylpyrazine from Example 36 (4.14 g, 19.3 mmol) 15 was dissolved in CC14 (40 mL). To this solution was added a solution of bromine (1.2 mL, 23 mmol) in CC14 (20 mL). The brown mixture was then heated to 60 C. After 6h the suspension was treated with saturated aqueous NaHCO3 (200 mL) and diluted with ethyl acetate (700 mL). The organic layer was washed with 5% aqueous Na2S203 (100 mL), brine (100 mL), dried over MgSO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography eluting with 80:20 20 hexane:ethyl acetate then 95:5, 94:6, and 90:10 CH2C12:ethyl acetate to afford 2-[1,2-dibromo-2-(3-fluorophenyl)ethyl]-6-methylpyrazine (2.97 g, 17% over two steps) as a white solid. This material was carried on to the next step without further purification.
Example 38 Synthesis of 2-[(3-Fluorophenyl)ethynyll-6-methvlpyrazine hydrochloride 25 2-[1,2-Dibromo-2-(3-fluorophenyl)ethyl]-6-methylpyrazine (2.97 g, 7.94 mmol) was dissolved in THE (40 mL), treated with DBU (8.7 mL, 63 mmol), and heated to reflux.
After 16 h the reaction mixture was cooled, filtered, concentrated in vacuo, and purified by column chromatography eluting with 80:20 then 75:25 hexane:ethyl acetate to afford 2-[(3-fluorophenyl)ethynyl]-6-methylpyrazine (427 mg, 25% yield). This material was carried on to the salt formation without further purification.
30 2-[(3-Fluorophenyl)ethynyl]-6-methylpyrazine (520 mg, 2.45 mmol) was dissolved in CH2C12 (3 mL), and the resulting solution was treated with HCl in diethyl ether (2.7 mL of a 1.OM solution, 2.7 mmol). The mixture was sonicated, and the solvent decanted. The remaining solid was dried under high vacuum to afford 2-[(3-fluorophenyl)ethynyl]-6-methylpyrazine hydrochloride (338 mg, 60%
yield) as a light yellow solid. M.p. 62-63 C. 'H NMR (CDC13, 300 MHz) S 8.73 (s, 1H), 8.57 (s, 1H), 7.54-7.35 (m, 3H), 7.28-7.20 (m, 3H), 2.84 (s, 3H).
Example 39 Synthesis of 1-Chloro-4-(1-cyclohexen-l-yl)-3-butyn-2-one Anhydrous ZnC12 (5.0 g, 37 mmol) was dissolved in THE (25 mL) and the solution cooled to 0 C in an ice bath. In another flask 1-ethynylcyclohexene (4.3 mL, 36.3 mmol) was dissolved in THE
(25 mL), cooled to 0 C in an ice bath, and treated with n-butyllithium (15.7 mL of a 2.2M solution in hexane, 34.5 mmol). After 20 minutes the cyclohexenylethynyllithium solution was added via cannula to the ZnC12 solution. After an additional 20 minutes Pd(PPh3)4 (620 mg, 0.54 mmol) was added to the alkynylzinc solution. The resulting yellow solution was treated with chloroacetyl chloride (4.2 mL, 55 mmol) dropwise over 10 minutes. After 2 h at 0 C the reaction mixture was quenched by the addition of saturated aqueous N144CI (500 mL), and diluted with ethyl acetate. The aqueous phase was extracted with ethyl acetate (3 x 200 ml) and the combined organic layers were washed with water (200 ml), brine (200 ml), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo to afford a dark brown oil that was purified by column chromatography eluting with hexane, then 99:1 hexane:ethyl acetate to afford 1-chloro-4-(1-cyclohexen-1-yl)-3-butyn-2-one (4.4 g, 67%
yield) as an orange oil. 1H
NMR (CDC13, 300 MHz) S 6.56 (m, 1H), 4.23 (s, 2H), 2.19 (m, 4H), 1.68-1.62 (m, 4H). MS (EI
ionization) 182 (35C1 M+), 184 (37C1 M). The material was carried on to the next step without further purification.
Example 40 Synthesis of 4-(1-Cyclohexen-l-vlethynyl)-2-methyl-1,3-thiazole, p-toluenesulfonic acid salt 1-Chloro-4-(1-cyclohexen-l-yl)-3-butyn-2-one (2.0 g, 11.0 mmol) was dissolved in DMF (10.0 mL), thioacetamide (950 mg, 12.6 mmol) was added, and the resulting pale brown solution was stirred at ambient temperature for 64 h. The reaction mixture was diluted with ethyl acetate (300 mL), washed with saturated NaHCO3 solution (300 mL), water (300 mL), brine (300 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was dissolved in ethyl acetate, adsorbed onto silica gel and purified by column chromatography eluting with hexane, 99:1 then 98:2 hexane:ethyl acetate to afford 4-(1-cyclohexen-1-ylethynyl)-2-methyl-1,3-thiazole (620 mg, 28% yield) as a yellow powder.
'H NMR (CDC13i 300 MHz) 8 7.22 (s, 111), 6.27-6.24 (m, 1H), .2.7 (s, 3H) 2.22-2.12 (m, 4H), 1.68-1.58 (m, 4H).
4-(1-Cyclohexen-1-ylethynyl)-2-methyl-1,3-thiazole (620 mg, 3.1 mmol) was dissolved in ethanol (30 mL) at ambient temperature. p-Toluenesulfonic acid monohydrate (580 mg, 3.1 mmol) was added in one portion to afford a brown solution. After all of the acid had dissolved the reaction mixture was stirred for several minutes and then concentrated in vacuo to afford a dark brown oil which solidified under high vacuum. The crude material was dissolved in hot ethyl acetate. After cooling to ambient temperature the material was stored in the freezer for few hours. The supernatant solution was decanted and the crystalline solids were dried under high vacuum to afford crystalline 4-(1-cyclohexen-1-ylethynyl)-2-methyl-l,3-thiazole p-toluenesulfonate salt (882 mg , 74%
yield) as yellow crystals.
M.p. 128-129 C. 'H NMR (CD3OD, 300 MHz) S 7.87 (s, 1H), 7.71-7.68 (d, J=9 Hz, 2H), 7.24-7.21 (d, J=9Hz, 3H), 6.38 (m,.1H), 2.88, (s, 3H), 2.36 (s, 3H), 2.21-2.17 (m, 4H), 1.68-1.64 (m, 4H).
Example 41 Synthesis of 4-(1-Cvclohexen-l-vlethvnvl)-1,3-thiazol-2-ylamine, p-toluenesulfonic acid salt 1-Chloro-4-(1-cyclohexen-1-yl)-3-butyn-2-one (2.0 g, 11 mmol) was dissolved in DMF (10.0 mL), thiourea (996 mg, 13.1 mmol) was added, and the resulting pale brown solution was stirred at ambient temperature for 16 h. The reaction mixture was diluted with ethyl acetate (200 mL), washed with saturated NaHCO3 solution (100 mL), water (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The dark oil was dissolved in ethyl acetate, adsorbed onto silica gel and purified by column chromatography eluting with 9:1 then 3:1 hexane:ethyl acetate to afford 4-(1-cyclohexen-1-ylethynyl)-1,3-thiazol-2-ylamine (1.1 g, 49% yield) as an off-white solid. MS (EI
ionization) 204 (M+).
4-(1-Cyclohexen-l-ylethynyl)-1,3-thiazol-2-ylamine (1.1g, 5.4 mmol) was dissolved in ethanol (40 mL) at ambient temperature. p-Toluenesulfonic acid monohydrate (1.0 g, 5.4 mmol) was added in one portion to afford a brown solution. After all of the acid had dissolved the reaction mixture was stirred for several minutes and then concentrated in vacuo to afford a dark brown oil which solidified under high vacuum. The crude material was dissolved in hot ethyl acetate.
After cooling to ambient temperature the material was stored in the freezer. After several hours in the freezer, the supernatant solution was decanted and the crystalline solids were dried under high vacuum to afford 4-(1-cyclohexen-1-ylethynyl)-1,3-thiazol-2-ylamine p-toluenesulfonate salt (1.84 g, 87% yield) as off-white powder. M.p. 188-189 C. 'H NMR (CD3OD, 300 MHz) 6 7.72 -7.69 (d, J=9 Hz, 2H), 7.24-7.22 (d, J=6 Hz, 2H), 6.94 (s, 1H), 6.34-6.32 (m, 1H), 2.36 (s, 3H), 2.19-2.15 (m, 4H) 1.70-1.61 (m, 4H).
Example 42 Synthesis of 2-(1-Cvclohexen-l-vlethvnvl)-6-methylpyridine 2-Bromo-6-methyl pyridine (2.0 g, 12 mmol) and Cul (440 mg, 2.3 mmol) were combined in DME (30 mL), and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.0 mL, 58 mmol) and PdC12(PPh3)2 (814 mg, 1.16 mmol) were added, followed by the dropwise addition of 1-ethynylcyclohexene (1.7 g, 15 mmol).
The reaction was stirred at ambient temperature overnight. GC/MS showed no starting 2-bromo-6-methylpyridine remaining.
The mixture was diluted with ethyl acetate (100 mL), and filtered through CeliteTM. The pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with water (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography eluting with hexane then 99:1, 98:2 hexane:ethyl acetate to afford 2-(1-cyclohexen-1-ylethynyl)-6-methylpyridine (1.8 g, 79%
yield) as a red oil. 1H
NMR (CDC13, 300 MHz) S 7.51-7.46 (m, 1H), 7.21 (d, J=9 Hz, 1H), 7.03 (d, J=9 1H), 6.32-6.29 (m, 1H), 2.53 (s, 3H), 2.24-2.21 (m, 2H), 2.14-2.12 (m, 2H), 1.67-1.57 (m, 4H). MS
(ESI) 198.1 (M).
Example 43 Synthesis of 2-(Cyclohexylethvnyl)-6-methylpyridine 2-Bromo-6-methyl pyridine (2.0 g, 11.6 mmol) and CuI (440 mg, 2.3 mmol) were combined in DME (30 mL), and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.0 mL, 58 mmol) and PdC12(PPh3)2 (814 mg, 1.16 mmol) were added, followed by the dropwise addition of cyclohexylethyne (1.25 g, 11.6 mmol). The reaction was stirred at ambient temperature overnight. GC/MS showed no starting 2-bromo-6-methylpyridine remaining.
The mixture was diluted with ethyl acetate (100 mL), and filtered through CeliteTM. The pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with water (200 mL), brine (200 mL), dried over Na2S04, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography eluting with hexane then 98:2, 96:4 hexane:ethyl acetate to afford 2-(cyclohexylethynyl)-6-methylpyridine (1.78 g, 77% yield) as a pale brown liquid that partially solidified on standing in the freezer. 1H NMR (CDC13, 300 MHz) S 7.52-7.46 (m, 1H), 7.20 (d, J=9 Hz, 1H), 7.03 (d, J=9 Hz, 1H), 2.6 (m,1 H), 2.54 (s, 3H), 2.93-2.89 (m, 2H), 1.78-1.73 (m, 2H), 1.57-1.54 (m, 3H), 1.36-1.32 (m, 3H). MS (ESI) 200.1 (M++H).
Example 44 Preparation of 4-Methyl-2-1(E)-2-phenylethenyll-1,3-oxazole Cinnamamide (2.0 g, 14 mmol), chloroacetone (0.93 mL, 16 mmol), and K2C03 (940 mg, 6.8 mmol) were combined under argon and the mixture was heated in a 120 C oil bath. The reaction mixture solidified and stirring stopped upon heating. After 16 h, the cooled reaction mixture was quenched by the addition of water (20 mL) and then diluted with ethyl acetate (100 mL). The organic phase was dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography eluting with 90:10 hexane:ethyl acetate. The product that was obtained (280 mg) showed some close running impurities by thin layer chromatography (TLC).
The material was further purified by preparative TLC via multiple elutions with 95:5 hexane:ethyl acetate. Isolation of the middle of the main band afforded 4-methyl-2-[(E)-2-phenylethenyl]-1,3-oxazole (47.0 mg, 2%
yield) as a yellow oil. 'H NMR (CDC13, 300 MHz) S 7.53-7.32 (m, 7H), 6.91 (d, J=16.4 Hz, 1H), 2.21 (s, 3H). MS (ESI) 185.7 (M+H).
Example 45 4-Methyl-2-12-phenylethenyll-l,3-thiazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of Ethyl 4-methyl-1,3-thiazole-2-carboxylate: Ethyl thiooxamate (3.0 g, 22 mmol) was dissolved in ethanol (30 mL) under argon. Chloroacetone (1.8 mL, 22 mmol) was added and the resultant solution was heated at 80 C for 16 h. The reaction mixture was concentrated in vacuo, adsorbed onto silica gel, and purified by column chromatography on silica gel eluting with 97:3, then 95:5 hexane:ethyl acetate to afford ethyl 4-methyl-1,3-thiazole-2-carboxylate (850 mg, 22% yield) as an oil. 'H NMR (CDC13, 300 MHz) 7.20 (s, 1 H), 4.48 (q, J=7.1 Hz), 2.56 (s, 3H), 1.47 (s, 3H). MS
(EI ionization) 171 (M).
Preparation of (4-Methyl-1,3-thiazol-2-yl)methanol: Ethyl 4-methyl-1,3-thiazole-2-carboxylate (450 mg, 2.6 mmol) was dissolved under argon in tetrahydrofuran (THF) (5 mL). The solution was cooled to 0 C in an ice bath and treated with diisobutylaluminum hydride (5.3 mL of a 1.5M solution in toluene, 7.9 mmol). The reaction mixture was allowed to slowly warm to ambient temperature over 16 h and then cooled to -78 C and cautiously quenched by the dropwise addition of methanol. After gas evolution had ceased, saturated aqueous sodium-potassium tartrate (10 mL) was added, and the reaction mixture was allowed to warm to ambient temperature.
The aqueous phase was extracted with ethyl acetate (3 x 30 mL), the combined organics dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 90:10 then 1:1 hexane:ethyl acetate to afford (4-methyl-1,3-thiazol-2-yl)methanol (180 mg, 53%
yield) as an oil. 'H NMR (CDC13, 300 MHz) S 6.81 (s, 1H), 4.84 (s, 3H), 2.36 (s, 3H). MS (EI
ionization) 129 (M).
Preparation of 4-Methyl-1,3-thiazole-2-carbaldehyde: (4-Methyl-1,3-thiazol-2-yl)methanol (180 mg, 1.4 mmol) was dissolved in CH2Cl2 (9 mL), and treated with MagtrieveTM (2.5 g). The resultant suspension was heated to reflux for 16 h. The reaction mixture was cooled and filtered through a pad of CeliteTM. The filter pad was washed thoroughly with CH2Cl2 and the combined filtrates were concentrated in vacuo to afford 4-methyl-1,3-thiazole-2-carbaldehyde (120 mg, 67%
yield) as an oil. The material was carried on to the next step without further purification. MS (El ionization) 127 (M).
Preparation of 4-Methyl-2-[2-phenylethenyll-1,3-thiazole: Sodium hydride (102 mg of a 60% suspension in mineral oil, 4.3 mmol) was slurried in dry 1,2-dimethoxyethane (DME) under argon, cooled to 0 C in an ice bath, and diethylbenzyl phosphonate (0.89 mL, 4.3 mmol) was added dropwise to the suspension. Thirty minutes after the completion of the phosphonate addition, 4-methylthiazole-2-5 carboxaldehyde (120 mg, 0.94 mmol) was added as a solution in DME (5 mL).
After stirring for 4 h, further NaH (40 mg of a 60% suspension in mineral oil, 1.0 mmol) was added and the reaction mixture was allowed to warm to ambient temperature and stir for 16 h. The reaction mixture was quenched by the addition of water (20 mL) and ethyl acetate (50 mL). The aqueous phase was extracted with ethyl acetate (2 x 30 mL), the combined organics were dried over Na2S04, filtered, and concentrated in 10 vacuo. The crude product was purified by column chromatography on silica gel eluting with 90:10 hexane:ethyl acetate to afford 4-methyl-2-[2-phenylethenyl]-1,3-thiazole (30 mg, 16% yield) as an oil.
'H NMR analysis showed the material to be a 10:1 mixture of E and Z isomers (spectral data are reported for the major isomer). 'H NMR (CDC13, 300 MHz) S: 7.54-7.51 (m, 2H) 7.42-7.23 (m, 5H) 6.80 (s, 1H) 2.47 (s, 3H). MS (ESI) (minor isomer) 202.2 (M++H), (major isomer) 201.6 (M+).
15 Example 46 2-Methyl-4-[(E)-2-phenylethenyll-l,3-thiazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of Ethyl 2-methyl-1,3-thiazole-4-carboxylate: Thioacetamide (7.6 g, 100 20 mmol) was added to ethanol (60 mL), and the resultant suspension was cooled to 0 C and treated with ethyl bromopyruvate (12.5 mL, 100 mmol). The resultant solution was stirred for five minutes at 0 C
at which time the ice bath was removed and the solution was allowed to warm to ambient temperature.
After 0.5 h at ambient temperature, the solution was heated to reflux. After 12 h, the solvents were removed in vacuo, and the resultant crude product was taken up in ethyl acetate (300 mL). The organic 25 phase was washed with saturated aqueous NaHCO3 (50 mL), and the basic aqueous solution was then extracted with additionalethyl acetate (2 x 50 mL). The combined organic solutions were washed with brine (50 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo to afford a yellow waxy solid. The crude product was dissolved in a small amount of hot ethyl acetate, diluted with hot hexane, and the resultant solution was allowed to cool to ambient temperature, seeded with a 30 small amount of crude product, and transferred to the freezer. After 16 h the crystalline product was collected, washed with cold 8:1 hexane:ethyl acetate, and allowed to dry under high vacuum to afford ethyl 2-methyl-1,3-thiazole-4-carboxylate (11.76 g, 69% yield) as large brownish crystals. M.p. 56-58.5 C. 1H NMR (CDC13, 300 MHz) S 8.06 (s, 1H), 4.43 (q, 2H), 2.78 (s, 3H), 1.42 (t, 3H). MS (El ionization) 171 (M+).
Preparation of (2-Methyl-1,3-thiazol-4-yl)methanol: Ethyl 2-methyl-1,3-thiazole-4-carboxylate (15 g, 60 mmol) was slurried in THE (40 mL) and cooled to 0 C.
Lithium aluminum hydride (60 mL of a 1M solution in THF) was added slowly and the reaction mixture was allowed to warm to 25 C. After 16 h the reaction was quenched by the dropwise addition of water (2.28 mL), 15% NaOH solution (2.28 mL) and then water (6.84 mL). Ethyl acetate (100 mL) was added, the reaction mixture filtered, and the filtrate concentrated in vacuo. The crude residue was chromatographed on silica gel with ethyl acetate:hexane (1:1) as eluant to afford (2-methyl- 1,3 -thiazol-4-yl)methanol as an oil (4.41 g, 57%). This material was carried on to the next step without further purification.
Preparation of 2-Methyl-1,3-thiazole-4-carbaldehyde: (2-Methyl-1,3-thiazol-4-yl)methanol (4.4 g , 34 mmol) was dissolved in CH2C12 (400 mL). MagtrieveTM (44 g) was added and the reaction was heated under reflux for 24 h. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with CH2C12. The filtrate was concentrated in vacuo to afford 2-methyl-1,3-thiazole-4-carbaldehyde (3.7g, 86% yield) as a yellow oil which was carried on to the next step without further purification. 1H NMR (CDC13, 300 MHz) 6 9.98 (s, 1H), 8.06 (s, 1H,), 2.79 (s, 3H,). MS (EI
ionization) 127 (M+).
Preparation of 2-Methyl-4-[(E)-2-phenylethenyl[-1,3-thiazole: Sodium hydride (120 mg of a 60% suspension in mineral oil, 3.0 mmol) was slurried in DME (6 mL) and cooled to 0 C. Diethyl benzylphosphonate (1.1 g, 5.0 mmol) was added dropwise and after 15 minutes, 2-methyl-1,3-thiazole-4-carbaldehyde (320 mg, 2.5 mmol) in DME (5 mL) was added dropwise to the reaction mixture. After 3 h at 0 C the reaction mixture was diluted with ethyl acetate (10 mL) and washed with saturated aqueous NH4CI (10 mL), saturated aqueous NaHCO3 (10 mL), brine (10 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 90:10 hexane:ethyl acetate to afford 2-methyl-4-[(E)-2-phenylethenyl]-1,3-thiazole (330 mg, 65% yield) as an oil. 1H NMR (CDC13, 300 MHz) 6 7-7.5 (m, 8H), 2.7 (s, 3H). MS
(ESI) 202.1 (M++H).
Example 47 2-Methyl-4-(phenylethynyl)-1,3-thiazole, p-toluenesulfonic acid salt The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of 1-Chloro-4-phenyl-3-butyn-2-one: Anhydrous ZnC12 (10 g, 73 mmol) was dissolved in THE (50 mL) and the solution cooled to 0 C in an ice bath. In another flask phenylacetylene (8.0 mL, 73 mmol) was dissolved in THE (50 mL), cooled to 0 C
in an ice bath, and treated with n-butyllithium (32 mL of a 2.2M solution in hexane, 70 mmol).
After 20 minutes the phenylethynyllithium solution was added via cannula to the ZnC12 solution.
After an additional 20 minutes Pd(PPh3)4 (1.23 g, 1.06 mmol) was added to the alkynylzinc solution.
The resulting yellow solution was treated with chloroacetyl chloride (8.8 mL, 110 mmol) dropwise over 10 minutes. After 2 h at 0 C the reaction mixture was quenched by the addition of cold aqueous 1M
HCl (50 mL), and diethyl ether (500 mL). The acidic aqueous was extracted with diethyl ether (2 x 50 mL) and the combined organic extracts were washed with water (50 mL), saturated NaHCO3 (50 mL), and brine (50 mL). The dark solution was dried and decolorized over Na2SO4, and charcoal and filtered through a pad of CeliteTM. The pad was washed thoroughly with ethyl acetate and the combined filtrates were concentrated in vacuo to afford a dark brown oil. The crude product was purified by column chromatography eluting with hexane, 99:1, 98:2, 96:4, then 94:6 hexane:ethyl acetate to afford 1-chloro-4-phenyl-3-butyn-2-one (7.83 g, 60% yield) as an orange oil which darkened and partially solidified upon standing in the freezer. IH NMR (CDC13, 300 MHz) S 7.63-7.60 (m, 2H), 7.53-7.39 (m, 3H), 4.33 (s, 3H). MS (EI ionization) 178 (35C1 M+), 180 (37C1 M+).
Preparation of 2-Methyl-4-(phenylethynyl)-1,3-thiazole, p-toluenesulfonic acid salt: 1-Chloro-4-phenyl-3-butyn-2-one (1.6 g, 9.1 mmol) was dissolved in dry acetonitrile (15 mL), treated with thioacetamide (680 mg, 9.1 mmol), and heated to reflux for 4 h. After cooling, the acetonitrile was removed in vacuo, and the residue was partitioned between water (50 mL) and ethyl acetate (150 mL).
The organic phase was dried over Na2SO4, filtered, concentrated in vacuo, adsorbed onto silica gel, and purified by column chromatography on silica gel eluting with 99:1, 98:2, then 95:5 hexane:ethyl acetate to afford 2-methyl-4-(phenylethynyl)-1,3-thiazole (240 mg, 13% yield) as a red oil. 1H NMR (CDC13, 300 MHz) S 7.58-7.54 (m, 2H), 7.40-7.34 (m, 4H), 2.74 (s, 3H). MS (EI
ionization) 199 (M+).
2-Methyl-4-(phenylethynyl)-1,3-thiazole (270 mg, 1.35 mmol) was dissolved in ethanol (6 mL) at ambient temperature. p-Toluenesulfonic acid monohydrate (252 mg, 1.32 mmol) was added in one portion to afford a brown solution. After all of the acid had dissolved the reaction mixture was stirred for several minutes and then concentrated in vacuo to afford a dark brown oil which partially solidified under high vacuum. The crude material was triturated with diethyl ether, and the resulting solids were taken up in hot ethyl acetate. The hot solution was treated with decolorizing carbon and filtered hot to afford a pale brown solution, which was treated with hexane until cloudy, then heated to afford a clear solution. The solution was seeded with authentic product and allowed to crystallize. After cooling to ambient temperature the material was stored in the freezer for 16 h. The supernatant solution was decanted and the crystalline solids were pumped down under high vacuum to afford crystalline 2-methyl-4-(phenylethynyl)-1,3-thiazole, p-toluenesulfonic acid salt (260 mg, 52% yield) as brown crystals. M.p. 131-132.5 C. 1H NMR (CD3OD, 300 MHz) S 7.99 (s, 1H), 7.70 (d, J=8.lHz), 7.60-7.57 (m, 2H), 7.46-7.43 (m, 3H), 7.23 (d, J=8 Hz, 2H), 2.89, (s, 3H), 2.36 (s, 3H).
MS (ESI) 199.7 (M++H).
Example 48 Preparation of 4-(Phenylethynyl)-1,3-thiazol-2-amine.
p-toluenesulfonic acid salt 1-Chloro-4-phenyl-3-butyn-2-one (245 mg, 1.37 mmol) was dissolved in DMF (1.0 mL), thiourea (126 mg, 1.66 mmol) was added, and the resulting pale brown solution was stirred at ambient temperature for 5 days. The reaction mixture was diluted with Ethyl acetate (50 mL), washed with saturated NaHCO3 solution (10 mL), water (10 mL), brine (10 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The dark oil was dissolved in methanol, adsorbed onto silica gel and purified by column chromatography eluting with 4:1, 3:1, then 2:1 hexane:ethyl acetate to afford 4-(phenylethynyl)-1,3-thiazol-2-amine (56 mg, 20% yield) as an oil. IH NMR
(CDC13, 300 MHz) S
7.53-7.50 (m, 2H), 7.37-7.32 (m, 3H), 6.77 (s, 1H), 5.41 (br s, 2H). MS (EI
ionization) 200 (M+).
4-(Phenylethynyl)-1,3-thiazol-2-amine (700 mg, 3.5 mmol) was dissolved in ethanol (20 mL) at ambient temperature. p-Toluenesulfonic acid monohydrate (660 mg, 3.5 mmol) was added in one portion to afford a brown solution. After all of the acid had dissolved the reaction mixture was stirred for several minutes and then concentrated in vacuo to afford a dark brown oil which solidified under high vacuum. The crude material was dissolved in hot ethyl acetate containing a few drops of methanol. After cooling to ambient temperature the material was stored in the freezer for few hours.
The supernatant solution was decanted and the crystalline solids were dried under high vacuum to afford crystalline 4-(phenylethynyl)-1,3-thiazol-2-amine, p-toluenesulfonic acid salt (1.0 g , 73% yield) as brown crystals. M.p. 131-132.5 C. 1H NMR (CD3OD, 300 MHz) S 7.73 -7.70 (d, J=9 Hz, 2H), 7.56-7.52 (dd, J=9,2 Hz, 2H), 7.48-7.37 (m, 3H), 7.23-7.20 (d, J 9Hz, 2H), 7.12, (s, 1H), 2.34 (s, 3H).
Example 49 4-Methyl-5-(phenylethynyl)-1,3-thiazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of 5-Bromo-4-methyl-1,3-thiazole: N-Bromosuccinimide (30 g, 170 mmol) was suspended in CC14 (150 mL) and 4-methylthiazole (15 g, 150 mmol) was added in one portion. The mixture was heated under reflux for 4 h then allowed to cool to ambient temperature. The reaction mixture was diluted with ethyl acetate (500 mL) and washed with water, then brine. The organics were dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with 9:1 hexane:methylene chloride to afford 5-bromo-4-methyl-1,3-thiazole (6.8g, 24% yield) as a dark reddish oil. 1H NMR (CDC13, 300 MHz) S 8.69 (s, 1H), 2.44 (s, 3H). MS
(EI ionization) 177 (35C1 M+), 179 (37C1 M+).
Preparation of 4-Methyl-5-(phenylethynyl)-1,3-thiazole: 5-Bromo-4-methyl-1,3-thiazole (570mg, 3.2 mmol) and Cul (120 mg , 0.63 mmol ) were combined in DME (5 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture.
Triethylamine (2.0 mL, 14 mmol) and PdC12(PPh3)2 (220 mg, 0.32 mmol) were added, followed by the dropwise addition of phenylacetylene (1.0 mL, 9.5 mmol ). After 16 h stirring at ambient temperature additional phenylacetylene (0.35 mL, 3.2 mmol), Cu!, (61 mg, 0.32 mmol), and PdC12(PPh3)2 (110 mg, 0.16 mmol) were added and the reaction mixture was stirred for a further 16 h. The reaction was then heated to reflux, and after 3 h the reaction mixture was cooled, diluted with ethyl acetate (20 mL), and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate and the combined filtrates were washed with water (20 mL), brine (20 mL), dried over Na2SO4, filtered and concentrated in vacuo.
The residue was purified by column chromatography on silica gel eluting with 95:5 hexane:ethyl acetate to afford 4-methyl-5-(phenylethynyl)-1,3-thiazole (166 mg, 26% yield) as a red oil. 1H NMR
(CDC13, 300 MHz) S 8.62 (s, 1H), 7.54-7.50 (m, 2H), 7.37-7.26 (m, 3H), 2.6 (s, 3H). MS (ESI) 200.1 (M++H).
Example 50 5-[(2-Fluorophenyl)ethynyll-4-methyl-1,3-thiazole 5-Bromo-4-methyl-1,3-thiazole (500 mg, 2.8 mmol) and Cul (120 mg, 0.63 mmol) were combined in DME (5 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (2.0 mL, 14 mmol) and PdC12(PPh3)2 (220 mg, 0.32 mmol) were added, followed by the dropwise addition of (2-fluorophenyl)acetylene (1.0 g, 8.3 mmol) . The reaction mixture was heated and after 3 h at reflux, allowed to cool, diluted with ethyl acetate (20 mL), and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate and the combined filtrates were washed with water (20 mL), brine (20 mL), dried over Na2SO4, and filtered.
The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with 95:5 hexane:ethyl acetate to afford 5-[(2-fluorophenyl)ethynyl]-4-methyl-1,3-thiazole (690 mg, 56% yield) as a red oil. IH NMR (CDC13, 300 MHz) 6 8.65 (s, 1H), 7.53-7.47 (m, IH), 7.36-7.26 (m, 1H), 7.17-7.09 (m, 2H), 2.62 (s, 3H). MS (ESI) 217.3 (M+).
Example 51 2-(Phenylethynyl)-1,3-thiazole, p-toluenesulfonic acid salt 2-Bromo-1,3-thiazole (2.0 g, 12 mmol) and Cu! (460 mg, 2.4 mmol) were combined in DME
(40 mL), and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (8.6 mL, 62 mmol) and PdC12(PPh3)2 (856 mg, 1.22 mmol) were added and then phenylacetylene (3.7g, 36.5 mmol) was added dropwise. The reaction was heated to reflux at which point the reaction mixture solidified. Additional DME (20 mL) was added to dissolve the solids and the reaction mixture was allowed to stir for 16 h at reflux, at which time GC/MS showed no remaining 2-bromothiazole. After cooling, the mixture was diluted with 200 mL
ethyl acetate, and filtered through CeliteTM. The pad was then washed thoroughly with ethyl acetate and the combined filtrates were washed with water (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography eluting with 5 hexane, then 97:3 hexane:ethyl acetate) to afford 2-(phenylethynyl)-1,3-thiazole (1.3 g, 60% yield) as a yellowish oil. 1H NMR (CDC13, 300 MHz) 8 7.86 (d, J=3.2 Hz, 1H), 7.61-7.57 (m, 2H), 7.42-7.26 (m, 4H). MS (ESI) 185.2 (M+).
2-(Phenylethynyl)-1,3-thiazole (3.00 g, 16.2 mmol) was dissolved in ethanol (75 mL) at ambient temperature. p-Toluenesulfonic acid monohydrate (3.08 g, 16.2 mmol) was added in one 10 portion to afford a yellow solution. After all of the acid had dissolved the reaction mixture was stirred for several minutes and then concentrated in vacuo to afford a bright yellow solid. An attempt was made to recrystallize the material from hot ethyl acetate:hexane, but the recovery of solid after cooling was poor. Analysis of the crude material from the reaction showed it to be of sufficient purity. 2-(Phenylethynyl)- 1,3-thiazole, p-toluenesulfonic acid salt (4.77 g, 82% yield) was obtained as a bright 15 yellow powder that turns beige upon standing at ambient temperature. M.p.
130-132 C. 1H NMR
(CD3OD, 300 MHz) 6 8.17 (d, J=3.7 Hz, 1H), 8.05 (d, J=3.7 Hz, 1H), 7.72-7.67 (m, 4 H), 7.56-7.46 (m, 3 H), 7.22 (d, J=8 Hz, 2 H), 2.35 (s, 3 H). MS (ESI) 186.1 (M++H).
Example 52 4-Bromo-2-(phenylethynyl)-1,3-thiazole 20 2,4-Dibromo-l,3-thiazole (2.0 g, 8.2 mmol) and CuI (312 mg, 1.64 mmol) were combined in DME (25 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (5.7 mL, 41 mmol) and PdC12(PPh3)2 (580 mg, 0.82 mmol) were added, and then phenylacetylene (0.90 mL, 8.6 mmol) was added dropwise. The reaction was stirred for 4 h at ambient temperature at which point GC/MS analysis showed the reaction to be complete . The mixture 25 was filtered through CeliteTM, the filter pad was washed thoroughly with Ethyl acetate and the combined filtrates were then concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with water (200 mL), brine (200 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane, then 97:3 hexane:ethyl acetate to afford pure 4-bromo-2-(phenylethynyl)-1,3-thiazole (1.0 g, 46% yield) as a 30 colorless solid. M.p. 79-82 C; 1H NMR (CDC13, 300 MHz) 8 7.60-7.56 (m, 2H) 7.45-7.26 (m, 3H), 7.26 (s, 1H). MS (EI ionization) 263 (M+, 79Br), 265 (M+, 81Br).
Example 53 5-Methyl-2-(phenylethynyl)-1,3-thiazole 4-Bromo-2-(phenylethynyl)-1,3-thiazole (500 mg, 1.89 mmol) was dissolved in dry THE (10 mL) under argon, cooled to -78 C, then t-butyllithium (1.7 mL of a 1.7M
solution in pentane, 2.8 mmol) was added. After 30 min 0.4 mL of the reaction mixture was quenched with saturated NH4C1 and extracted with ethyl acetate. GC/MS of the crude product from this workup and comparison with a GC/MS of authentic 2-(2-phenylethynyl)-thiazole showed the two to be identical. This confirmed that the initial coupling with phenylacetylene (in Example 9) took place at the bromine at the 2 position rather than at the 4 position. The GC/MS also showed that the reaction was not complete. Additional t-butyllithium (1.7 mL of a 1.7M solution in pentane, 2.8 mmol) was added. After 30 minutes iodomethane (0.36 mL, 5.7 mmol) was added to the reaction mixture, and the reaction was allowed to warm to ambient temperature for 16 h. The solvents were then removed in vacuo, and residue dissolved in ethyl acetate (50 mL), washed with water (50 mL), brine (50 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography eluting with hexane, 99:1, 98:2, 97.5:2.5 hexane:ethyl acetate to afford 2-(2-phenylethynyl)-5-methyl-1,3-thiazole (90 mg). 1H NMR analysis of the material showed it to be impure, despite its apparent homogeneity by TLC analysis. The crude compound was dissolved in DMSO and purified by preparative HPLC with a 30 min gradient from 70:30 water:acetonitrile to 100%
acetonitrile to afford pure 5-methyl-2-(phenylethynyl)-1,3-thiazole as a white powder (44 mg, 24%
yield). M.p. 82-83 C. 1H
NMR (CDC13, 300 MHz) S 7.85-7.55 (m, 2H), 7.49 (d, J=0.6 Hz, 1H), 7.37-7.32 (m, 3H), 2.49 (s, 3H).
MS (ESI) 200.1 (M++H).
Example 54 2-1(3-Methylphenyl)ethynyll-1,3-thiazole 2-Bromo-1,3-thiazole (2.0 g, 13 mmol) and Cul (330 mg, 1.7 mmol) were combined in DME
(25 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (5.7 mL, 43 mmol) and PdC12(PPh3)2 (604 mg, 0.86 mmol) were added and m-tolylacetylene (1.0 g, 8.6 mmol) was added dropwise. The reaction mixture was heated under reflux for 4 h at which time GC/MS showed the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with water (200 mL), brine (200 mL), dried over Na2SO4, filtered and concentrated in vacuo.
The residue was purified by column chromatography eluting with hexane then 98:2 hexane:ethyl acetate to afford 2-[2-(3-methylphenyl)ethynyl]-thiazole (280 mg, 16% yield) as a yellow oil which was still impure by I H
NMR analysis. The compound (280 mg) was dissolved in DMSO and purified by preparative HPLC
with a 30 min gradient from 70:30 water:acetonitrile to 100% acetonitrile to afford pure 2-[(3-methylphenyl)ethynyl]-1,3-thiazole (122 mg, 6% yield) as a yellow oil. 1H NMR
(CDC13, 300 MHz) S
7.84 (d, J=3.0 Hz, 111), 7.40-7.34 (m, 3H), 7.28-7.18 (m, 2H), 2.34 (s, 3H).
MS (ESI) 200.1 (M++H).
Example 55 2-1(4-Fluorophenyl)ethynyll-l,3-thiazole 2-Bromo-1,3-thiazole (1.0 g, 6.2 mmol) and Cu! (152.4 mg, 0.8 mmol) were combined in DME
(17 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (3 mL, 21 mmol) and PdC12(PPh3)2 (280 mg, 0.40 mmol) were added and 1-ethynyl-4-fluorobenzene (500 mg, 4.2 mmol) was added dropwise. The reaction was heated under reflux for 4 h at which time GC/MS showed the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with Ethyl acetate.
The combined filtrates were then concentrated in vacuo. The residue was dissolved in ethyl acetate (100 mL), washed with water (100 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 98:2 hexane:ethyl acetate to 2-[(4-fluorophenyl)ethynyl]-1,3-thiazole as a white solid which was impure by 'H NMR
analysis. The compound (280 mg) was dissolved in DMSO and purified by preparative HPLC with a 30 min gradient from 60:40 water:acetonitrile to 100% acetonitrile to afford 2-[(4-fluorophenyl)ethynyl]-1,3-thiazole (33 mg, 3% yield) as a white solid. M.p. 78-79 C. 'H NMR (CDC13, 300 MHz) S
7.83 (d, J=3.0 Hz, 11-1), 7.60-7.55(m, 2H), 7.39 (d, J=3.0 Hz, 1H), 7.14-7.00 (m, 2H). MS (ESI) 204 (M+H).
Example 56 2-1(2-Fluorophenvl)ethvnvll-1,3-thiazole 2-Bromo-1,3-thiazole (2.0 g, 13 mmol) and Cu! (316 mg, 1.6 mmol) were combined in DME
(25 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (5.8 mL, 42 mmol) and PdC12(PPh3)2 (580 mg, 0.83 mmol) were added and 1-ethynyl-2-fluorobenzene (1.0 g, 8.3 mmol) was added dropwise. The reaction was heated under reflux for 4 h at which time GC/MS showed the reaction was complete. The mixture was filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL) and washed with water (200 mL), brine (200 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 98:2 hexane:ethyl acetate to afford 2-[(2-fluorophenyl)ethynyl]-1,3-thiazole (700 mg, 41% yield) as a yellow oil that was impure by 'H NMR
analysis. The compound (140 mg) was dissolved in DMSO and purified by preparative HPLC with a 30 min gradient from 50:50 water:acetonitrile to 100% acetonitrile to afford 2-[(2-fluorophenyl)ethynyl]-1,3-thiazole (53.2 mg, 75% yield) as a yellow oil. 'H
NMR (CDC13, 300 MHz) S
7.88 (d, J=3.0 Hz, 1H), 7.59-7.53 (m, 1H), 7.42-7.35 (m, 2H), 7.18-7.09 (m, 2H). MS (ESI) 204 (M++H).
Example 57 4,5-Dimethyl-2-(phenylethynvl)-1,3-thiazole.
The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of 2-Bromo-4,5-dimethyl-1,3-thiazole: 4,5-Dimethyl-1,3-thiazole (5.0 g, 44 mmol) was dissolved in carbon tetrachloride (60 mL), and N-bromosuccinimide (8.19 g, 46 mmol) was added. The resulting mixture was heated to reflux while protected from light with aluminum foil. After 'Y2 h at reflux the dark suspension was cooled and allowed to stand at ambient temperature for 16 h. The reaction mixture was then heated to reflux for an additional 4 h and cooled to ambient temperature.
After standing at ambient temperature for 16 h, GC/MS analysis showed mostly monobromide, with a small amount of starting 4,5-dimethyl-1,3-thiazole present. The yellow supernatant solution was decanted from the black solids that had deposited on the walls of the flask.
The crude product was concentrated in vacuo, and then further purified by column chromatography eluting with hexane, 99:1, 98:2, 96:4, 94:6, then 90:10 hexane:ethyl acetate to afford 2-bromo-4,5-dimethyl-1,3-thiazole (1.34 g, 16 % yield) as a white semi-solid. M.p. 55-60 C. 'H NMR (CDC13, 300 MHz) S
2.31 (s, 3H), 2.30 (s, 3H). MS (El ionization) 191 (M+, 79Br), 193 (M+, 81Br).
Preparation 4,5-Dimethyl-2-(phenylethynyl)-1,3-thiazole: 2-Bromo-4,5-dimethyl-1,3-thiazole (1.3 g, 6.8 mmol) and CuI (190 mg, 1.36 mmol) were combined in DME
(30 mL) and argon gas was bubbled through the suspension for several minutes to deoxygenate the mixture. Triethylamine (5.0 mL, 34 mmol) and PdC12(PPh3)2 (477 mg, 0.68 mmol) were added and phenylacetylene (1.86 g, 18.9 mmol) was added dropwise. After stirring at ambient temperature for 16 h, GC/MS showed the reaction was complete. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (100 mL), washed with water (100 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with hexane then 95:5 hexane:ethyl acetate to afford 4,5-dimethyl-2-(phenylethynyl)-1,3-thiazole (338 mg 24% yield) as a white solid. M.p. 55-60 C. 1H NMR (CDC13, 300 MHz) S 7.56-7.53 (m, 2H), 7.35-7.33 (m, 3H), 2.38 (s, 6H). MS (ESI) 214.0 (M++H).
Example 58 5-Methyl-3-[(E)-2-phenylethenyl]-1,2,4-oxadiazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of (2E)-N-Hydroxy-3-phenyl-2-propenimidamide: To a solution of hydroxylamine hydrochloride (690 mg, 10 mmol) in ethanol was added NaOH (400 mg, 10 mmol), followed by cinnamonitrile (1.3 g, 10 mmol). This mixture was heated to reflux for 16 h. The ethanol was removed in vacuo, the residue was acidified with 3M HCl (5 mL) and the solution was boiled for 30 minutes. The cooled solution was made basic (pH 8) with NH4OH, and partitioned between water and ethyl acetate. The organics were concentrated to give a sticky white mass which was used without further purification.
Preparation of 5-Methyl-3-[(E)-2-phenylethenyl]-1,2,4-oxadiazole: (2E)-N-Hydroxy-3-phenyl-2-propenimidamide (1.6 g, 10 mmol) was mixed with excess acetyl chloride (30 mL), and heated to reflux. After 1 h the solution was cooled and the excess acetyl chloride was removed in vacuo. The resultant solids were triturated in hot ethyl acetate-hexane-acetone solution, and the supernatant was removed. The remaining solids were dried under high vacuum to afford 5-methyl-3-[(E)-2-phenylethenyl]-1,2,4-oxadiazole (0.50 g, 27% yield from cinnamonitrile) as a pale yellow powder. M.p. 166-168 C. 'H NMR (DMSO-d6, 300 MHz) 5 7.59 (m, 3H), 7.42 (m, 3H), 6.58 (d, J=16 Hz, 1H), 2.17 (s, 3H).
Example 59 5-[(E)T2- henylethenvll-1 2 4-oxadiazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of N-[(Dimethylamino)methylene]-cinnamamide: Cinnamamide (4.4 g, mmol) and N,N-dimethylformamide dimethylacetal (9.9 mL, 75 mmol) were heated at reflux for 2 h.
Excess formamide and methanol formed in the reaction were removed in vacuo.
The solids which formed were collected and washed with hexane, followed by two portions of ethyl acetate, then dried under vacuum at 40 C to afford N-[(dimethylamino)methylene]-cinnamamide (3.5 g, 58% yield) as a white crystalline solid. M.p. 91-93 C. 'H NMR (DMSO-d6, 300 MHz) S 8.58 (s, 1H), 7.83 (d, J=16 Hz, 1H), 7.57 (m, 2H), 7.36 (m, 3H), 6.74 (d, J=16 Hz, 1H), 3.18 (m, 6H).
Preparation of N-[(Hydroxyamino)methylene]-cinnamamide:
N-[(Dimethylamino)methylene]-cinnamamide (1.0 g, 5.0 mmol) was added to a solution of hydroxylamine hydrochloride (415 mg, 6.0 mmol) in acetic acid (5 mL of 70%
aqueous) and aqueous NaOH (1.2 mL, 5 M, 6.0 mmol). After stirring for 1.5 h water (5 mL) was added , and the reaction mixture was cooled to 5 C in an ice bath. The solution was partitioned between ethyl acetate and water, and the organics were dried over Na2SO4, then concentrated in vacuo to afford N-[(hydroxyamino)methylene]-cinnamamide (850 mg, 90%). This material was carried on to the next step without further purification.
Preparation of 5-[(E)-2-phenylethenyl]-1,2,4-oxadiazole: N-[(Hydroxyamino)methylene]-cinnamamide (850 mg, 4.5 mmol) was dissolved in acetic acid/dioxane (20 mL 1:1 v:v), and heated to reflux for 2 h. The cooled solution was made basic (pH 8) with K2C03, and partitioned between ethyl acetate and water. The organics were dried over Na2SO4, and concentrated in vacuo. The resultant 5 solids were triturated with hot ethyl acetate, and the soluble portion was purified by flash column chromatography on silica eluting with 2:1 hexane:ethyl acetate to afford 5-[(E)-2-phenylethenyl]-1,2,4-oxadiazole (60 mg, 8% yield) as a white powder. M.p. 53-55 C. 1H NMR (CDC13, 300 MHz) S 8.43 (s, 1H), 7.85 (d, J=16 Hz, 1H), 7.60 (m, 2H), 7.45 (m, 3H), 7.05 (d, J=16 Hz, 1H). MS (EI ionization) 171 (M+-H).
10 Example 60 Preparation of 1-Methyl-5-[(E)-2-phenylethenyl]-1H-1,2.4-triazole N-[(Dimethylamino)methylene]-cinnamamide (2.0 g, 10 mmol) was added to a mixture of acetic acid (20 mL) and methylhydrazine (0.6 mL, 11 mmol). The mixture was heated to 90 C for 2 h.
The cooled mixture was concentrated in vacuo, and made basic (pH 9) with solid K2CO3. The aqueous 15 residue was partitioned between ethyl acetate and water, the organics were dried over Na2SO4i and concentrated in vacuo. The resultant powder was recrystallized from a minimum of boiling Ethyl acetate. The collected solids were triturated and washed with ethyl acetate to afford 1-methyl-5-[(E)-2-phenylethenyl]-1H-1,2,4-triazole (0.9 g, 49 % yield) as a pale yellow powder.
M.p. 67-70 C from Ethyl acetate. 'H NMR (CDC13, 300 MHz) 8 7.88 (s, 1H), 7.73 (d, J=16 Hz, 1H), 7.57 (m, 2H), 7.39 20 (m, 3H), 6.92 (d, J=16Hz, 1H), 3.96 (s, 3H).
Example 61 3-Methyl-5- [(E)-2-phenylethenyl]-1 H-1 2,4-triazole The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
25 Preparation of N-[(Dimethylamino)ethylidene]-cinnamamide: Cinnamamide (1.8 g, 12 mmol) and N,N-dimethylacetamide dimethylacetal (2.8 mL, 19 mmol) were heated to 120 C for 2 h.
Excess amide and methanol formed in the reaction were removed in vacuo. The resultant material was purified by flash column chromatography on silica eluting with ethyl acetate to afford N-[(dimethylamino)ethylidene]-cinnamamide (2.1 g, 78 % yield) as a pale yellow solid containing one 30 equivalent of ethyl acetate. 'H NMR (DMSO-d6, 300 MHz) S 7.61 (d, J=16 Hz, 1H), 7.53 (m, 2H), 7.36 (m, 3H), 6.68 (d, J=16 Hz, 1H), 3.13 (app d, J=15 Hz, 6H), 2.30 (s, 3H).
Preparation of 3-Methyl-5-[(E)-2-phenylethenyl]-1H-1,2,4-triazole:
N-[(Dimethylamino)ethylidene]-cinnamamide (2.0 g, 9.0 mmol) was added to a solution of hydrazine hydrate (0.59 mL, 10 mmol) and acetic acid (25 mL). The mixture was heated to 90 C for 3 h, cooled, and concentrated in vacuo. The resulting material was basified (pH 8) with solid K2CO3, and partitioned between ethyl acetate and water. The organics were dried over Na2SQ4, and concentrated in vacuo. The resultant material was purified by flash column chromatography on silica eluting with 1:2 hexane-ethyl acetate to afford 3-methyl-5-[(E)-2-phenylethenyl]-111-1,2,4-triazole (1.6 g, 96% yield) as a white powder. M.p. 131-134 C. 'H NMR (CDC13, 300 MHz) 8 7.68 (d, J=16 Hz, 0.3H), 7.59 (d, J=16 Hz, 0.711), 7.49 (m, 211), 7.32 (m, 3H), 7.05 (d, J=16 Hz, 111), 6.49 (d, J=16 Hz, 0.4H), 6.21 (br s, 0.3H), 5.88 (br s, 0.3H), 2.53 (s, 311). MS (El ionization) 184 (M+-H).
Example 62 Ethyl 3-1(E)-2-phenylethenyll-1,2,4-thiadiazole-5-carboxylat The title compound was prepared in several steps, with the preparation of key intermediates set forth herein as follows:
Preparation of 5-[(E)-2-Phenylethenyl]-1,3,4-oxathiazol-2-one: Cinnamamide (1.9 g, 13 mmol) was mixed with chlorocarbonylsulphenylchloride (1.0 mL, 13 mmol) in chloroform and heated to reflux for 18 h. The reaction mixture was concentrated in vacuo and the resultant material was taken up in boiling hexane (100 mL). The solvent was decanted from the remaining solid, the volume of this solution was reduced by half, and the solution was allowed to cool. The crystalline solids which formed were collected and washed with hexane to afford 5-[(E)-2-phenylethenyl]-1,3,4-oxathiazol-2-one (1.93 g, 72% yield) as pale yellow needles. M.p. 105-106 C 'H NMR (DMSO-d6, 300 MHz) 6 7.52 (m, 3H), 7.46 (s, 0.5H), 7.41 (m, 2.5H), 6.63 (d, J=16 Hz, 1H).
Preparation of Ethyl 3-[(E)-2-phenylethenyl]-1,2,4-thiadiazole-5-carboxylate:
5-[(E)-2-Phenylethenyl]-1,3,4-oxathiazol-2-one (1.4 g, 7.0 mmol) was mixed with ethyl cyanoformate (2.4 g, 25 mmol) in xylenes, and heated to reflux for 3 h. The reaction mixture was concentrated in vacuo, and the resulting material was recrystallized from ethyl acetate-ethanol (1:1) to give ethyl 3-[(E)-2-phenylethenyl]-1,2,4-thiadiazole-5-carboxylate (1.2 g, 66% yield) as a light yellow solid. M.p. 79-80 C. 'H NMR (CDC13, 300 MHz) 8 7.98 (d, J=16 Hz, 1H), 7.61 (m, 2H), 7.40 (m, 3H), 7.29 (d, J=11 Hz, 1H), 4.56 (q, J=7 Hz, 2H), 1.50 (t, J=7 Hz, 3H). MS (EI ionization) 259 (M+-H).
Example 63 {3-[(E)-2-phenylethenyl]-1,2,4-thiadiazol-5-yllmethanol Ethyl3-[(E)-2-phenylethenyl]-1,2,4-thiadiazole-5-carboxylate (1.0 g, 3.8 mmol) was suspended in methanol (50 mL), and NaBH4 (220 mg, 5.8 mmol) was added in portions. The mixture was stirred for 16 h at ambient temperature. The reaction was concentrated in vacuo, acidified with aqueous HCl (4 M) to pH 2, and partitioned between Ethyl acetate and water. The organics were dried over Na2SO4i concentrated in vacuo, and the resultant material was rerystallized from ethyl acetate to afford {3-[(E)-2-phenylethenyl]-1,2,4-thiadiazol-5-yl}methanol (0.6 g, 71% yield) as a pale yellow solid. M.p. 119-120 C.'H NMR (CDC13i 300 MHz) 8 7.79 (d, J=16 Hz, 1H), 7.57 (m, 2H), 7.38 (m, 3H), 7.23 (d, J=16 Hz, 1H), 5.14 (d, J=5 Hz, 2H), 3.29 (t, J=5 Hz, 1H). MS (EI ionization) 217 (M+-H).
Example 64 2-(1-Cyclohexen-l-ylethvnvl)-5-methylthiophene 2-Iodo-5-methylthiophene (1.0 g, 4.5 mmol) was mixed with PdC12 (44 mg, 0.25 mmol), PPh3 (200 mg, 0.75 mmol), Cul (140 mg, 0.75 mmol) and K2C03 (1.66 g, 12 mmol) in a solution of DME
and water (1:1). Argon gas was bubbled through the suspension for twenty minutes to deoxygenate the mixture. 1-Ethynyl-l-cyclohexene (1.06 g, 10.0 mmol) was added and the mixture was heated to reflux. After 16 hours the reaction was cooled and filtered through CeliteTM.
The resultant solution was partitioned between water and ethyl acetate. The organic layer was dried over anhydrous Na2SO4, and concentrated in vacuo. The resulting product was purified by flash column chromatography on silica gel eluting with hexane to afford 2-(1-cyclohexen-1-ylethynyl)-5-methylthiophene (0.96 g, 86% yield) as a light yellow oil. 'H NMR (CDC13, 300 MHz) 6 6.94 (d, J= 3.5 Hz, 1H), 6.60 (m, 1H), 6.18 (m, 1H), 2.45 (s, 3H), 2.13 (m, 4H), 1.68-1.57 (m, 4H). MS (EI ionization) 202 (M+).
Example 65 Synthesis of 2-(1H-inden-2-ylethynyl)pyridine 2-Indanone (1.0g, 7.6 mmol) was dissolved in THE (60 mL) and cooled to -78 C
in an argon blanketed flask. Potassium hexamethyl disilazide (9.1 mmol, 18.2 mL of a 0.5M
solution in toluene) was added dropwise to this stirred solution. After 30 min, N-phenyl trifluoromethanesulfonimide (4.05 g, 11.4 mmol) was added as a solution in THE (15 mL). The reaction was stirred for 15 min at -78 C, then brought to ambient temperature and stirred for an additional 1 h, after which time it was quenched with H2O (15 mL) and diluted with ethyl acetate (500 mL). The ethyl acetate solution was washed with H2O (3 x 100 mL) and brine (100 mL), then dried (MgSO4), filtered, and concentrated in vacuo. The residue was chromatographed on silica gel, eluting with 30:1 hexanes:ethyl acetate to afford 2-[(trifluoromethyl)sulfonyl]-1H-indene (1.28 g, 64% yield) as a brown oil. The enol triflate (500 mg, 1.89 mmol) and 2-ethynyl pyridine (579 mg, 5.62 mmol) were dissolved in DME
(10 mL) and deoxygenated via argon bubbling for 20 min and then added via syringe to a deoxygenated DME (25 mL) solution of triphenylphosphine (100 mg, 0.38 mmol), bis-triphenylphosphine palladium dichloride (133 mg, 0.19 mmol), Cul (72 mg, 0.38 mmol), and triethylamine (954 mg, 1.32 mL, 9.45 mmol). The reaction was capped with a reflux condenser and stirred at 80 C for 1.5 h, after which time it was cooled to ambient temperature and poured in to a separatory funnel containing ethyl acetate (300 mL), where it was washed with H2O (2 x 100 mL) and brine (100 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 6:1 hexanes:ethyl acetate to afford 2-(1H-inden-2-ylethynyl)pyridine (309 mg, 75% yield) as the free base, which was then solubilized in diethyl ether (25 mL) and precipitated as the hydrochloride salt (M.p. 170-172 C) upon treatment with 1M HCI in diethyl ether (5 mL). 'H NMR
(CD3OD, 300 MHz) b 8.98 (d, J=5.7 Hz, 1H), 8.76 (t, J=8.0 Hz, 1H), 8.33 (d, J=8.0 Hz, 1H), 8.17 (t, J=6.3 Hz, I H), 7.82 (s, I H), 7.72 (m, 2H), 7.53 (m, 2H), 3.96 (s, 2H). MS
(ESI) 218.1 (M++H).
Example 66 Synthesis of 2-(3,4-dihydro-2-naphthalenylethynyl)pyridine 2,6-Lutidine (547 mg, 594 L, 5.1 mmol) was added neat, via syringe to a stirred, argon blanketed solution of [3-tetralone (500 mg, 3.4 mmol) in methylene chloride (30 mL) at ambient temperature. After 5 min, trifluoromethanesulfonic anhydride (1.439 g, 858 L, 5.1 mmol) was added slowly via syringe. After 1.5 h, the reaction was quenched with saturated aqueous NaHCO3 (5 mL) and partitioned between ethyl acetate (200 mL) and H2O (50 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The residue was then chromatographed on silica gel, eluting with 20:1 hexanes:ethyl acetate to afford 3-[(trifluoromethyl)sulfonyl]-1,2-dihydronaphthalene (361 mg, 38% yield) as a brown oil. Following the procedure described for Example 65, the (3-tetralone enol triflate (275 mg, 1.0 mmol) was cross-coupled with 2-ethynylpyridine (337 mg, 3.27 mmol) in a reaction over 16 h at 70 C. Upon completion, the reaction was concentrated in vacuo, and the residue was chromatographed on silica gel, eluting with 7:1 hexanes:ethyl acetate to afford 2-(3,4-dihydro-2-naphthalenylethynyl)pyridine (193 mg, 84% yield) as an off white semi-solid.
'H NMR (CDC13, 300 MHz) S 8.62 (d, J=4.5 Hz, I H), 7.67 (ddd, J=7.7 Hz, 7.7 Hz, 1.8 Hz, 1H), 7.48 (d, J=7.9 Hz, I H), 7.07-7.28 (m, 5H), 7.00 (s, 1H), 2.91 (t, J=7.8 Hz, 2H), 2.59 (t, J=8.4 Hz, 2H). MS
(ESI) 232.1 (M++H).
Example 67 Synthesis of 1-(2-pyridinylethynyl)-1-indanol n-Butyllithium (18.93 mmol, 11.8 mL of 1.6M solution in hexanes) was added dropwise to a stirred solution of 2-ethynylpyridine (1.95 g, 18.93 mmol) in THE (80 mL) at -78 C. After 15 min, solid anhydrous CeC13 (4.66 g, 18.93 mmol) was added and the reaction was stirred for an additional 1 h, at which time a solution of 1-indanone (1.00 g, 7.57 mmol) in THE (10 mL) was added via syringe.
The reaction was then warmed to ambient temperature, stirred for 1 h, and quenched with 5 mL H20.
The reaction was then diluted with ethyl acetate (250 mL) and extracted with H2O (3 x 75 mL). The combined aqueous portions were back-extracted with ethyl acetate (100 mL). The ethyl acetate layers were combined, dried over MgSO4, filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1:1 hexanes:ethyl acetate to afford 1-(2-pyridinylethynyl)-1-indanol (1.1 g, 62% yield) as a thick amber liquid. 'H NMR (CDCl3, 300 MHz) S 8.42 (d, J=4.9 Hz, I H), 7.63 (d, J=6.6 Hz, I H), 7.54 (ddd, J=7.7 Hz, 7.7 Hz, 1.7 Hz, I H), 7.33 (d, J=7.8 Hz, 1H), 7.10-7.25 (m, 4H), 5.50 (s, 1H), 3.12 (m, 1H), 2.91 (m, 1H), 2.68 (m, 1H), 2.53 (m, 1H). MS (ESI) 236.1 (M++H).
Example 68 Synthesis of 1-fluoro-2-(2-pyridinylethynyl)-2-indanol Potassium hexamethyldisilazide (19.9 mmol, 39.8 mL of 0.5M solution in toluene) was added slowly to a stirred solution of 2-indanone (2.20 g, 16.6 mmol) in THE (60 mL) at -78 C. After 15 min, trimethylsilyl chloride (2.64 mL, 20.8 mmol) was added to generate the 1H-inden-2-yl trimethylsilyl ether. The reaction was stirred for 10 min at -78 C, then brought to ambient temperature and stirred for an additional 30 min, after which time the solvents were removed in vacuo and replaced with anhydrous acetonitrile (80 mL). Solid Selectfluor~ (8.82 g, 24.9 mmol) reagent was then added and the resulting slurry was stirred for 16 h at ambient temperature. The reaction was then diluted with ethyl acetate (400 mL) and extracted with H2O (3 x 100 mL). The ethyl acetate layer was dried (MgS04), filtered, and concentrated in vacuo. The residue was chromatographed on silica gel, eluting with 4:1 hexanes:ethyl acetate to afford the 1-fluoro-2-indanone (1.05 g, 42% yield) product as a sticky brown solid. Following the procedure outlined for Example 67, the intermediate 1-fluoro-2-indanone (1.05 g, 7.0 mmol) was cross-coupled with 2-ethynyl pyridine (1.44 g, 14.0 mmol) to afford 1-fluoro-2-(2-pyridinylethynyl)-2-indanol (320 mg, 18% yield, 8% overall yield) as a tan semi-solid. 1H NMR
(CDC13, 300 MHz) S 8.57 (d, J=4.8 Hz, 1H), 7.64 (ddd, J=7.8 Hz, 7.8 Hz, 1.8 Hz, 1H), 7.49 (d, J=7.3 Hz, 1H), 7.22-7.43 (m, 5H), 5.98 (d, J['H-19F] = 56.0 Hz, 1H), 4.29 (s, 1H), 3.51 (s, 2H). MS (ESI) 254.1 (M++H).
Example 69 Synthesis of 2-1(3-fluoro-1H-inden-2-yl)ethynyllpyridine n-Butyllithium (2.39 mmol, 1.5 mL of 1.6M solution in hexanes) was added slowly to a stirred solution of 1-fluoro-2-(2-pyridinylethynyl)-2-indanol (550 mg, 2.17 mmol) and LiBr (188 mg, 2.17 mmol) in THE (15 mL) at -78 C. After 30 min, methanesulfonyl chloride (274 mg, 185 L, 2.39 mmol) was added and the reaction was stirred for an additional 1.5 h at ambient temperature before quenching with H2O (5 mL). The reaction flask contents were then transferred to a separatory funnel containing ethyl acetate (100 mL) that was subsequently washed with H2O (2 x 50 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was then dissolved in methylene chloride (25 mL), treated with DBU (1.982 g, 1.947 mL, 13.02 mmol), and warmed to reflux. After 16 h, the reaction mixture was cooled to ambient temperature, diluted with methylene chloride (100 ml) and washed with H2O (2 x 50 mL). The methylene chloride layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 5:1 hexanes:ethyl acetate to afford 2-[(3-fluoro-1H-inden-2-yl)ethynyl]pyridine (75 mg, 15% yield) as a yellow oil which was then solubilized in ether (15 mL) and precipitated as the hydrochloride salt (M.p. 150-152 C) upon treatment with 1M HCl in diethyl ether (2 mL). 'H NMR
(CD3OD, 300 MHz) 8 8.81 (d, J=5.3 Hz, 1H), 8.59 (ddd, J=8.0 Hz, 8.0 Hz, 1.4 Hz, 1H), 8.16 (d, J=8.
Hz, 1H), 8.00 (dd, J=6.4 Hz, 6.4 Hz, 1H), 7.45-7.58 (m, 4H), 3.76 (d, J[1H-19F] = 6.6 Hz). MS (ESI) 236.1 (M++H).
Example 70 Synthesis of 2-1(tert-butoxycarbonyl)aminolbenzoic acid 5 Anthranilic acid (1.37 g, 10.0 mmol) and di-tert-butyl dicarbonate (3.12 g, 14.3 mmol) were added to a stirred mixture of 0.5M NaOH (20.0 mL), dioxane (10.0 mL), and CH3CN (2.0 mL) at 0 C.
The cold bath was removed, and the reaction mixture was stirred at ambient temperature for 16 h before quenching with 10% aqueous citric acid (30 mL). The mixture was diluted with H2O (100 mL) in a separatory funnel and extracted with methylene chloride (3 x 100 mL). The combined methylene 10 chloride extracts were dried (MgSO4), filtered, and concentrated in vacuo to obtain 2-[(tert-butoxycarbonyl)amino]benzoic acid (2.33 g, 98% yield) as a white solid that was suitably pure to carry on to the next synthetic step.
Example 71 Synthesis of tert-butyl 2-f lmethoxy(methyl)aminolcarbonyl}phenylcarbamate 15 To a stirred solution of the N-BOC-anthranilic acid from Example 70 (2.33 g, 9.8 mmol) in methylene chloride (100 mL) was added EDC (2.82 g, 14.7 mmol), hydroxybenzotriazole dihydrate (1.459 g, 10.8 mmol), diisopropyl ethylamine (6.0 mL, 34.3 mmol), and N,O-dimethylhydroxylamine hydrochloride (1.43 g, 14.7 mmol). The reaction was stirred for 16 h, after which time it was concentrated in vacuo and diluted with ethyl acetate (500 mL). The ethyl acetate solution was washed 20 with 1M HCl (100 mL), saturated NaHCO3 (100 mL), brine (100 mL), and H2O (2 x 100 mL), then dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 4:1 hexanes:ethyl acetate to afford tert-butyl 2-{[methoxy(methyl)amino]carbonyl}phenylcarbamate (2.00 g, 73% yield) as a pale yellow solid.
Example 72 25 Synthesis of tert-butyl 2-formylphenvlcarbamate LiAlH4 (6.67 mmol, 6.67 mL of a 1.OM solution in THF) was added to an Ar-purged, stirred solution of the tert-butyl 2-{[methoxy(methyl)amino]carbonyl}phenylcarbamate from Example 71 (1.87 g, 6.67 mmol) in THE (50 mL) at -78 C. Stirring was continued at -78 C
for 15 min, after which time the reaction was brought to ambient temperature and stirred for an additional 1 h. The reaction 30 was then cooled to 0 C and treated with IN aqueous HCl (25 mL) to quench.
The mixture was poured in to a separatory funnel containing H2O (250 mL) and extracted with methylene chloride (3 x 100 mL).
The combined methylene chloride layers were dried (MgSO4), filtered, and concentrated in vacuo to afford tert-butyl 2-formylphenylcarbamate (1.48 g, 100% yield) as a tan solid.
Example 73 Synthesis of tert-butyl 2-fl-hydroxy-3-(2-pyridinyl)-2-propynyllphenylcarbamate n-Butyllithium (14.0 mmol, 8.75 mL of 1.6M solution in hexanes) was added dropwise to a stirred solution of 2-ethynylpyridine (1.44 g, 14.0 mmol) in THE (80 mL) at -78 C. After 15 min, solid anhydrous CeC13 (3.45 g, 14.0 mmol) was added and the reaction was stirred for an additional 1 h, after which time a solution of the tert-butyl 2-formylphenylcarbamate from Example 72 (1.48 g, 6.7 mmol) in THE (20 mL) was added via syringe. The reaction was warmed to ambient temperature, stirred for 1 h, quenched with H2O (5 mL), then diluted with ethyl acetate (250 mL) and extracted with H2O (3 x 75 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo, resulting in a crude residue that was chromatographed on silica gel, eluting with 2:1 hexanes:ethyl acetate to afford the racemic 2 alkanol (1.71 g, 79% yield) as a light peach colored amorphous solid.
Example 74 Synthesis of 4-(2-pyridinylethynyl)-1,4-dihydro-2H-3,1-benzoxazin-2-one The tert-butyl 2-formylphenylcarbamate from Example 73 (250 mg, 0.77 mmol) was deprotected without incident by dissolving the compound in dioxane (10 mL), treating it with 4M HCl in dioxane (30 mL, 120 mmol HCQ), and stirring for 2.5 h, resulting in precipitation from solution of the 1-(2-aminophenyl)-3-(2-pyridinyl)-2-propyn-l-ol as the hydrochloride salt. The dioxane solvent was decanted, the precipitate was triturated with diethyl ether (3 x 20 mL) and dried in vacuo to obtain the crude deprotected material as a pale pink solid. The deprotection was assumed to be quantitative, and the crude material was therefore carried on to the next step, dissolving it in a solution of diisopropylethylamine (500 mg, 674 L, 3.87 mmol) in methylene chloride (20 mL). The reaction flask was cooled to 0 C, and phosgene (1.935 mmol, 1.02 mL of a 1.89M solution in toluene) was added dropwise to the stirred solution. Stirring at 0 C was continued for 2.5 h, followed by an H2O (5 mL) quench. The biphasic mixture was diluted with ethyl acetate (100 mL) and washed with H2O (2 x 50 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 2:1 hexanes:ethyl acetate to obtain 4-(2-pyridinylethynyl)- 1,4-dihydro-2H-3,1-benzoxazin-2-one (140 mg, 73% yield) as a tan, semi-solid glass.
'H NMR (CDC13, 300 MHz) S 9.13 (s, 1H), 8.61 (d, J=4.4 Hz, 1H), 7.69 (ddd, J=7.8 Hz, 7.8 Hz, 1.8 Hz, I H), 7.51 (d, J=7.8 Hz, 1H), 7.41 (d, J=7.6 Hz, 1H), 7.27-7.34 (m, 2H), 7.11 (ddd, J=7.6 Hz, 7.6 Hz, 0.8 Hz, 1H), 6.93 (d, J=7.8 Hz, 1H), 6.34 (s, 1H). MS (ESI) 251.1 (M++H).
Example 75 Synthesis of ethyl 3-(2-pyridinylethynyl)-8-azabicyclol3.2.1loct-2-ene-8-carboxylate N-Carbethoxy-4-tropinone (500 mg, 2.54 mmol) was dissolved in THE (25 mL) and cooled to -78 C in an argon blanketed flask. Potassium hexamethyldisilazide (3.05 mmol, 6.1 mL of a 0.5M
solution in toluene) was added dropwise to this stirred solution. After 15 min, N-phenyl trifluoromethanesulfonimide (1.36 g, 3.81 mmol) was added as a solution in THE
(10 mL). The reaction was stirred for 15 min at -78 C, then brought to ambient temperature and stirred for an additional 1 h, after which time it was quenched with H2O (10 mL) and diluted with ethyl acetate (200 mL). The ethyl acetate solution was washed with H2O (3 x 50 mL), dried (MgSO4), filtered, and concentrated in vacuo. The residue was chromatographed on silica gel, eluting with a gradient from 5%
to 50% ethyl acetate in hexanes to afford the ethyl 3-[(trifluoromethyl)sulfonyl]-8-azabicyclo[3.2.1]oct-2-ene-8-carboxylate (820 mg, 98% yield) as a tan liquid. The ethyl 3-[(trifluoromethyl)sulfonyl]-8-azabicyclo[3.2.1]oct-2-ene-8-carboxylate (820 mg, 2.50 mmol) and 2-ethynylpyridine (516 mg, 5.00 mmol) were dissolved in DME (15 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated DME (25 mL) solution of triphenylphosphine (131 mg, 0.50 mmol), bis-triphenylphosphine palladium dichloride (176 mg, 0.25 mmol), CuI (95 mg, 0.50 mmol), and triethylamine (1.265 g, 1.74 mL, 12.50 mmol). The reaction was warmed to 50 C and stirred for 1.5 h, after which time it was cooled to ambient temperature and poured into a separatory funnel containing ethyl acetate (350 mL), where it was washed with H2O (2 x 100 mL) and brine (100 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1:1 hexanes:ethyl acetate to afford ethyl 3-(2-pyridinylethynyl)-8-azabicyclo[3.2.1]oct-2-ene-8-carboxylate (400 mg, 57%
yield) as a free base. The toluenesulfonate salt was then prepared by adding solid toluenesulfonic acid to a solution of ethyl 3-(2-pyridinylethynyl)-8-azabicyclo[3.2.1]oct-2-ene-8-carboxylate (200 mg, 0.69 mmol) in ethanol (10 mL).
The mixture was stirred for 5 min until all solids were dissolved, after which time the solution was concentrated in vacuo. The resulting red oil was triturated with ether (3 x 10 mL) and placed under high vacuum, where it foamed to a dark red semi-solid. 1H NMR (CD3OD, 300 MHz) S 8.86 (d, J=5.3 Hz, 1H), 8.64 (ddd, J=8.0 Hz, 8.0 Hz, 1.5 Hz, I H), 8.16 (d, J=8.1 Hz, I H), 8.07 (dd, J=6.3 Hz, 114), 7.80 (d, J=8.2 Hz, 2H), 7.31 (d, J=8.0 Hz, 2H), 6.96 (d, J=5.3 Hz, 1H), 4.64 (m, br., 1H), 4.52 (m, br., 1H), 4.24 (q, J=7.0 Hz, 2H), 2.92-3.08 (m, br., 1H), 2.45 (s, 3H), 2.07-2.41 (m, 4H), 1.86 (m, br., 1H), 1.36 (t, J=7.0, 3H). MS (ESI) 283.2 (M++H).
Example 76 Synthesis of 1-chloro-4-(trimethylsilyl)-3-butyn-2-one Aluminum trichloride (21.9 g, 164 mmol) was suspended in CH2C12 (250 mL) and cooled in an ice bath. Bis(trimethylsilyl)acetylene (20.0 g, 117 mmol) and chloroacetyl chloride (10.3 mL, 129 mmol) were combined in CH2CI2 (150 mL) and the solution was added to the A1C13 suspension dropwise from an addition funnel over 1 h. The dark brownish-red solution was stirred at 0 C for 1 h, then the ice bath was removed. After 1 h at ambient temperature, the reaction was cooled to 0 C and quenched by slow addition of 1M HCI.(250 mL). The acidic solution was extracted with CH2CI2 (2 x 500 mL), the combined organic layers were washed with H2O (500 mL), NaHCO3 (500 mL), brine (500 mL) and dried over Na2SO4. The organic layer was treated with silica gel, and filtered to afford a clear solution which was concentrated in vacuo. The residue was distilled under high vacuum through a vigreaux column. The main part of the distillate was collected at a head temperature of 58 C (the lower thermometer was 68 C) to afford 1-chloro-4-(trimethylsilyl)-3-butyn-2-one (11.25 g, 54% yield) as a light yellow oil.' H NMR (CDC13, 300 MHz) S 4.24 (s, 2H), 0.28 (d, 9H).
Example 77 Synthesis of 2-methyl-4-1(trimethylsilyl)ethynyll-1,3-thiazole The 1-chloro-4-(trimethylsilyl)-3-butyn-2-one from Example 76 (10 g, 57.2 mmol) was dissolved in DMF (100 mL), then thioacetamide (5.6 g, 74 mmol) was added in one portion. The mixture was allowed to stir for 16 h at' ambient temperature, at which time TLC showed no remaining 1-chloro-4-(trimethylsilyl)-3-butyn-2-one. The mixture was diluted with ethyl acetate (400 mL), and washed with H2O (3 x 300 mL), brine (300 mL), dried over Na2SO4, and filtered.
The filtrate was concentrated in vacuo, and the residue was purified by column chromatography eluting with hexane, 98:2, then 96.5:3.5 hexane:ethyl acetate to afford 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole (8.0 g, 72% yield) as reddish-brown oil. 'H NMR (CDC13, 300 MHz) b 7.32 (s, 1H), 2.70 (s, 3H), 0.26 (s, 9H). MS (EI ionization)195 (M).
Example 78 Synthesis of 4-f(trimethylsilyl)ethynyll-1,3-thiazol-2-vlamine The 1-chloro-4-(trimethylsilyl)-3-butyn-2-one from Example 76 (4.25 g, 24.3 mmol) was dissolved in DMF (20 mL), then thiourea (2.45 g, 32.2 mmol) was added in one portion. The mixture was allowed to stir for 16 h at ambient temperature, at which time TLC showed no remaining I-chloro-4-(trimethylsilyl)-3-butyn-2-one. The mixture was diluted with ethyl acetate (200 mL), and washed with H2O (3 x 200 mL), brine (200 mL), dried over Na2SO4i and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography eluting with hexane, 9:1, then 4:1 hexane:ethyl acetate to afford 4-[(trimethylsilyl)ethynyl]-1,3-thiazol-2-ylamine (4.1 g, 86% yield) as a yellow solid. ' H NMR (CDC13, 300 MHz) S 6.70 (s, 1H), 5.47 (br s, 2H), 0.20 (s, 9H). MS (EI
ionization) 196 (M+).
Example 79 Synthesis of 4-1(2-methyl-l,3-thiazol-4-yl)ethynyllisoguinoline 4-Bromoisoquinoline (276 mg, 1.33 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (200 mg, 1.02 mmol) were dissolved in DMF (5 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated, 40 C DMF
(15 mL) solution of triphenylphosphine (71 mg, 0.27 mmol), bis-triphenylphosphine palladium dichloride (93 mg, 0.13 mmol), Cul (51 mg, 0.27 mmol), tetrabutylammonium iodide (377 mg, 1.02 mmol), and triethylamine (515 mg, 710 L, 5.1 mmol). The reaction mixture was warmed to 60 C, and tetrabutylammonium fluoride (1.33 mmol, 1.33 mL of a 1.0 M solution in THF) was added slowly over 1.5 h. The reaction was then cooled to ambient temperature and poured into a separatory funnel containing 1:1 hexanes:ethyl acetate (200 mL) where it was washed with 50%
dilute brine (3 x 75 mL), dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1.5:1 hexanes:ethyl acetate to afford 4-[(2-methyl-1,3-thiazol-4-yl)ethynyl]isoquinoline (195 mg, 76% yield) as an off-white solid that was then solubilized in ether (15 mL) and precipitated as the white hydrochloride salt (M.p. 209-210 C) upon treatment with IM HCl in diethyl ether (5 mL). 'H NMR (CD3OD, 300 MHz) S 9.85 (s, 1H), 8.93 (s, 1H), 8.73 (d, J=8.4 Hz, 1H), 8.64 (d, J=8.4 Hz, I H), 8.42 (ddd, J=7.2 Hz, 7.2 Hz, 1.1 Hz, I H), 8.17 (dd, J=7.1 Hz, 7.1 Hz, I H), 8.16 (s, 1H), 2.85 (s, 3H). MS (ESI) 251.1 (M++H).
Example 80 Synthesis of 4-(4-isoquinolinylethynyl)-1,3-thiazol-2-amine Following the procedure and mole equivalents indicated for Example 79, 4-bromoisoquinoline (691 mg, 3.32 mmol) and 4-[(trimethylsilyl)ethynyl]-1,3-thiazol-2-amine from Example 78 (500 mg, 2.55 mmol) were cross-coupled to obtain 4-(4-isoquinolinylethynyl)-1,3-thiazol-2-amine (262 mg, 41%
yield) as a tannish-orange solid after eluting with 2:1 hexanes:ethyl acetate from a silica gel column.
This material was then solubilized in ether (15 mL) and precipitated as the yellow hydrochloride salt (M.p. >150 C, dec.) upon treatment with 1M HCl in diethyl ether (5 mL). 1H NMR
(CD3OD, 300 MHz) S 9.85 (s, I H), 8.96 (s, I H), 8.69 (d, J=8.4 Hz, I H), 8.62 (d, J=8.3 Hz, I H), 8.40 (ddd, J=7.1 Hz, 7.1 Hz, 1.2 Hz, 1H), 8.16 (dd, J=8.1 Hz, 8.1 Hz, 1H), 7.58 (s, 1H). MS (ESI) 252.0 (M++H).
Example 81 Synthesis of 2-1(trimethylsilyl)ethynyllpyrimidine PdC12 (166 mg, 0.93 mmol), Cu! (481 mg, 2.52 mmol), and triethylamine (18 mL, 129 mmol) were combined in DME (50 mL) under argon. Argon gas was bubbled through the resulting dark suspension while it was warmed to 70 C in an oil bath. Triphenylphosphine (978 mg, 3.73 mmol) was added and the argon flow was continued for 10 min. The argon flow was discontinued, the heating bath was removed, and 2-bromopyrimidine (5.14 g, 32.3 mmol), and trimethylsilylacetylene (9.1 mL, 64 mmol), were added as a solution in DME (30 mL) followed by a rinse of the flask and syringe with DME (10 mL). Solids appeared in the flask after the addition was completed.
The reaction mixture was then heated to 45 C. After 1 h the heating was discontinued and the reaction mixture was allowed to cool to ambient temperature. After 16 h at ambient temperature TLC analysis showed no starting 2-bromopyrimidine present. The reaction mixture was concentrated in vacuo, diluted with diethylether (300 mL), and filtered. The filtrate was washed with saturated aqueous NaHCO3 (100 mL), H2O (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo to afford a dark oil which partially solidified when pumped down under high vacuum. The crude product was purified by column chromatography eluting with hexane, 9:1, 8:1, 6:1, 4:1, then 3:1 hexane:ethyl acetate to afford 2-[(trimethylsilyl)ethynyl]pyrimidine (5.2 g, 91 % yield) as a yellow solid. 'H
NMR (CDCl3, 300 MHz) S 8.72 (d, J=4.9 Hz, 2H), 7.25 (m, IH), 0.30 (s, 9H). MS (EI ionization) 176 (M+).
Example 82 5 Synthesis of 4-(2-pyrimidinylethynyl)isoguinoline 4-Bromoisoquinoline (499 mg, 2.40 mmol) and 2-[(trimethylsilyl)ethynyl]pyrimidine from Example 81 (352 mg, 2.00 mmol) were dissolved in DMF (10 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (84 mg, 0.32 mmol), bis-triphenylphosphine palladium dichloride (112 mg, 0.16 10 mmol), Cu! (61 mg, 0.32 mmol), tetrabutylammonium iodide (369 mg, 1.00 mmol), and triethylamine (1.01 g, 1.39 mL, 10.00 mmol) in DMF (20 mL) at 40 C. The reaction was warmed to 50 C, and tetrabutylammonium fluoride (2.10 mmol, 2.10 mL of a I.OM solution in THF) was added slowly over 1.5 h. The reaction was then cooled to ambient temperature and poured in to a separatory funnel containing 1:1 hexanes:ethyl acetate (200 mL) where it was washed with 50%
dilute brine (3 x 75 mL), 15 dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1.5:1 hexanes:ethyl acetate to afford 4-(2-pyrimidinylethynyl)isoquinoline (210 mg, 45% yield) as an off-white solid that was then solubilized in diethyl ether (15 mL) and precipitated as the tan hydrochloride salt (M.p. 158-159 C) upon treatment with of 1M HCI in diethyl ether (3 mL).
'H NMR (CD3OD, 300 MHz) S 9.95 (s, 1H), 9.06 (s, 1H), 8.99 (d, J=5.0 Hz, 2H), 8.75 (d, J=8.4 Hz, 20 1 H), 8.67 (d, J=8.3 Hz, 1 H), 8.42 (ddd, J=7.2 Hz, 7.2 Hz, 1.1 Hz, 1 H), 8.17 (dd, J=7.3 Hz, 7.3 Hz, 1 H), 7.67 (dd, J=5.0 Hz, 5.0 Hz, 1H). MS (ESI) 232.0 (M++H).
Example 83 Synthesis of 2-F(6,7-dimethoxy-3,4-dihydro-2-naphthalenyl)ethynyllpyridine Using the procedure described in Example 66 but using 6,7-dimethoxy-l-tetralone in place of 25 [3-tetralone, 6,7-dimethoxy-3,4-dihydro-l-naphthalenyl trifluoromethanesulfonate was prepared in 90%
yield. 6,7-Dimethoxy-3,4-dihydro-l-naphthalenyl trifluoromethanesulfonate (1.48 g) was cross-coupled with 2-ethynylpyridine without incident following the procedure described for Example 66.
The crude reaction material was chromatographed on silica gel, eluting the product with 2:1 hexanes:ethyl acetate to obtain 2-(6,7-dimethoxy-3,4-dihydro-l-naphthalenylethynyl)pyridine (265 mg, 30 40% overall yield, 2 steps) as a pale yellow solid that was then solubilized in diethyl ether (15 mL) and precipitated as the yellow-orange hydrochloride salt upon treatment with of 1M
HCl in diethyl ether (5 mL). M.p. 148-150 C; 'H NMR (CD3OD, 300 MHz) 6 8.76 (d, J=5.7 Hz, 1H), 8.52 (ddd, J=7.9 Hz, 7.9 Hz, 1.5 Hz, I H), 8.14 (d, J=8.0 Hz, 1H), 7.94 (dd, J=6.3 Hz, 6.3 Hz, 1H), 7.11 (s, I H), 6.80 (t, J=5.0 Hz, 1H), 6.79 (s, IH), 3.83 (s, 3H), 3.80 (s, 3H), 2.74 (t, J=8.2 Hz, 2H), 2.43 (m, 2H). MS (ESI) 292.1 35 (M+H).
Example 84 Synthesis of methyl 5-f(2-methyl-1,3-thiazol-4-yl)ethynyllnicotinate Concentrated sulfuric acid (18 mL) was added to a stirred solution of 5-bromonicotinic acid (10.1 g, 50.0 mmol) in methanol (300 mL). The reaction was warmed to reflux and stirred for 18 h, then cooled to ambient temperature and quenched with saturated NaHCO3i adjusting the pH to -9. The methanol was removed in vacuo, and the remaining aqueous mixture was further diluted with H2O (250 mL) and extracted with ethyl acetate (3 x 100 mL). The ethyl acetate layers were combined, dried (MgSO4), filtered, and concentrated in vacuo to obtain methyl 5-bromonicotinate (10.09 g, 93% yield) as a white crystalline solid (M.p. = 98-99 C) without further purification.
This material (3.02 g, 14.0 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (2.48 g, 12.7 mmol) were dissolved together in DMF (20 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated, 40 C DMF (60 mL) solution of triphenylphosphine (534 mg, 2.04 mmol), bis-triphenylphosphine palladium dichloride (713 mg, 1.02 mmol), Cul (388 mg, 2.04 mmol), tetrabutylammonium iodide (1.88 g, 5.08 mmol), and triethylamine (6.414 g, 8.8 mL, 63.5 mmol). The reaction was warmed to 50 C, and tetrabutylammonium fluoride (14.0 mmol, 14.0 mL of a 1.OM solution in THF) was added via syringe pump over 1.5 h. The reaction was then cooled to ambient temperature and poured into a separatory funnel containing 1:1 hexanes:ethyl acetate (400 mL) where it was washed with 50% dilute brine (3 x 100 mL). The aqueous portion was back-extracted with 1:1 hexanes:ethyl acetate (100 mL). The organic layers were then combined, dried (MgSO4), filtered, and concentrated in vacuo, and the crude residue was chromato-graphed on silica gel, eluting with 3:1 hexanes:ethyl acetate to afford methyl 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]nicotinate (2.56 g, 78% yield) as an off-white solid. M.p. = 124-125 C. 'H NMR (CDC13, 300 MHz) S 9.15 (s, 1H), 8.93 (s, 1H), 8.40 (dd, J= 2.0 Hz, 2.0 Hz, IH), 7.49 (s, 1H), 3.98 (s, 3H), 2.76 (s, 3H). MS (ESI) 259.0 (M++H).
Example 85 Synthesis of N-hydroxyethanimidamide hydrochloride Hydroxylamine hydrochloride (13.8 g, 200 mmol) was dissolved in a IM solution of NaOH in ethanol (200 mL). To this was added acetonitrile (8.2 g, 10.43 mL, 200 mmol) neat, via syringe. The reaction was stirred at reflux for 17 h, then cooled to ambient temperature at which time 12M HCl was added (35.4 mL, 425 mmol). The mixture was concentrated in vacuo to afford a white solid to which was added boiling ethanol (200 ml). The insoluble material was then filtered, and the filtrate was collected and concentrated in vacuo to obtain N-hydroxyethanimidamide hydrochloride (19.45 g, 88%
yield) as a white crystalline solid.
Example 86 Synthesis of 3-(3-methyl-1,2,4-oxadiazol-5-yl)-5-1(2-methyl-1,3-thiazol-4-vl)ethynyllpyridine NaH (23.4 mmol, 936 mg of a 60% suspension in mineral oil) was added to a suspension of N-hydroxyethanimidamide hydrochloride from Example 85 (1.27 g, 11.5 mmol) in THE
(50 mL). The mixture was warmed to 50 C and stirred for 30 min, after which time methyl 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]nicotinate from Example 84 (1.00g, 3.9 mmol) was added as a solution in THE (20 mL).
After 45 min, the reaction was quenched with H2O (15 mL), and partitioned between ethyl acetate (250 mL) and H2O (100 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was filtered through a short plug of silica gel, eluting with 2.5% methanol in methylene chloride, then recrystallized from 1:1 hexanes:ethyl acetate to obtain 3-(3-methyl-1,2,4-oxadiazol-5-yl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (596 mg, 54%
yield) as white crystalline leaves, M.p. 153-154 C. 'H NMR (CDC13, 300 MHz) S 9.27 (d, J=2.0 Hz, 1H), 8.95 (d, J=2.0 Hz, 1H), 8.52 (dd, J=2.0 Hz, 2.0 Hz, 1H), 7.50 (s, 1H), 2.77 (s, 3H), 2.51 (s, 3H). MS
(ESI) 283.0 (M++H).
Example 87 Synthesis of 1-(methylsulfonyl)-3-F(2-methyl-13-thiazol-4-yl)ethynyll-1H-indole To a vigorously stirred solution of indole (1.0 g, 8.6 mmol) in DMF (40 mL) at ambient temperature was added KOH pellets (1.8 g, 32.1 mmol) followed by iodine (4.34 g, 17.1 mmol). After 15 min, the reaction was poured in to a separatory funnel containing saturated aqueous sodium thiosulfate (200 mL), which was then extracted with 1:1 hexanes:ethyl acetate (3 x 100 mL). The combined organic layers were first back-extracted with 1:1 H20:brine (3 x 75 mL), then dried (MgSO4), filtered, and concentrated in vacuo. The crude 3-iodo-1H-indole product was dissolved in benzene (15 mL) and to this solution was added tetrabutylammonium iodide (332 mg, 0.9 mmol), H2O (10 mL), and 50% v/v aqueous NaOH (10 mL). This biphasic mixture was stirred vigorously at ambient temperature while a solution of methanesulfonyl chloride (1.47 g, 993 L, 12.8 mmol) in benzene (15 mL) was added dropwise via syringe. After this addition, the reaction was stirred for 1 h, then partitioned with ethyl acetate (200 mL) and H2O (100 mL). The ethyl acetate layer was dried (MgSO4), filtered, and concentrated in vacuo leaving a crude residue that was eluted through a short plug of silica with 4:1 hexanes:ethyl acetate. The resulting brown solid (2.26 g) was recrystallized from methanol to provide 3-iodo-l-(methylsulfonyl)-1H-indole (1.44 g, 43% yield, 2 steps) as tan-colored needles. Following the procedure and mole equivalents indicated above for Example 79 the 3-iodo-l-(methylsulfonyl)-lH-indole (350 mg, 1.09 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (150 mg, 0.77 mmol) were cross-coupled to obtain 1-(methylsulfonyl)-3-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-1H-indole (55 mg, 23% yield) as a tan solid after eluting with 4:1 hexanes:ethyl acetate from a silica gel column. This material was then solubilized in ether (10 mL) and precipitated as the off-white hydrochloride salt (M.p. 152-154 C) upon treatment with of 1M HCl in diethyl ether (2 mL).
'H NMR (CD3OD, 300 MHz) 8 8.02 (s, 1H), 7.96 (s, 1H), 7.95 (dd, J=7.5 Hz, 1.1 Hz, 1H), 7.81 (dd, J=7.1 Hz, 1.2 Hz, 111), 7.49 (ddd, J=7.8 Hz, 7.8 Hz, 1.2 Hz, 111), 7.43 (ddd, J=7.5 Hz, 7.5 Hz, 1.1 Hz, 1H), 3.36 (s, 3H), 2.91 (s, 3H). MS (ESI) 317.0 (M++H).
Example 88 Synthesis of 2-chloro-5-1(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine 2-Chloro-5-iodo-pyridine (3.0g, 12.53 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (2.57 g, 13.16 mmol) were dissolved in DMF (15 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (394 mg, 1.50 mmol), bis-triphenylphosphine palladium dichloride (528 mg, 0.75 mmol), Cul (286 mg, 1.50 mmol), tetrabutylammonium iodide (927 mg, 2.51 mmol), and triethylamine (6.33 g, 8.7 mL, 62.7 mmol) in DMF (60 mL) at 40 C. The reaction was warmed to 50 C, and tetrabutylammonium fluoride (13.8 mmol, 13.8 mL of a 1.OM solution in THF) was added via syringe pump over 1.5 h. The reaction was then cooled to ambient temperature and poured into a separatory funnel containing 1:1 hexanes:ethyl acetate (200 mL) where it was washed with 50% dilute brine (3 x 75 mL), dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 0.5% to 1.0% methanol in methylene chloride to afford 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (2.29 g, 78% yield) as an off-white solid, M.p. 138-139 C. 'H
NMR (CDC13, 300 MHz) S 8.56 (d, J=2.1 Hz, 1H), 7.78 (dd, J=8.3 Hz, 2.3 Hz, 1H), 7.45 (s, 1H), 7.33 (d, J=8.2 Hz, 1H), 2.75 (s, 3H). MS (ESI) 234.9 (M++H).
Example 89 Synthesis of 5-1(2-methyl-1,3-thiazol-4-yl)ethynyll-2-phenylpyridine Phenylboronic acid (569 mg, 4.26 mmol) and 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 88 (1.00 g, 4.26 mmol) were dissolved in DME
(10 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (112 mg, 0.43 mmol), bis-triphenylphosphine palladium dichloride (150 mg, 0.21 mmol), and potassium carbonate (1.18 g, 8.52 mmol) in DME (15 mL) and H2O (25 mL) at 40 C. The reaction was stirred at reflux for 3 h, then cooled to ambient temperature and poured into a separatory funnel containing ethyl acetate (250 mL). The ethyl acetate layer was washed with saturated NaHCO3 (50 mL), and H2O (2 x 50 mL), then dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 4:1 hexanes:ethyl acetate to afford 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-2-phenylpyridine (1.00 g, 85%
yield) as a pale yellow solid, M.p. 102-103 C. 'H NMR (CDC13, 300 MHz) S 8.86 (d, J=2.1, 1H), 8.00 (m, 2H), 7.89 (dd, J=8.3 Hz, 2.2 Hz, 1H), 7.73 (d, J=8.3 Hz, 1H), 7.45 (s, 1H), 7.43-7.52 (m, 3H), 2.76 (s, 3H). MS (ESI) 277.0 (M++H).
Example 90 Synthesis of 2-(4-chlorophenyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyllpyridine Following the procedure and mole equivalents indicated above for Example 89, 4-chloro phenylboronic acid (74 mg, 0.47 mmol) and 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 88 (100 mg, 0.43 mmol) were cross-coupled to obtain 2-(4-chlorophenyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (105 mg, 79% yield) as a white solid after eluting with 3:1 hexanes:ethyl acetate from a silica gel column. This material was solubilized in ethanol (10 mL) and acidified with 1M HCl in diethyl ether (4 mL). The pale yellow hydrochloride salt (M.p. 193-194 C) was then obtained upon concentration of this solution in vacuo and trituration with diethyl ether (3 x 10 mL). 'H NMR (CD3OD, 300 MHz) S 8.86 (s, 1H), 7.98 (d, J=8.5 Hz, 2H), 7.95 (d, J=8.6 Hz, 1H), 7.73 (d, J=8.2 Hz, 1H), 7.47 (s, 1H), 7.47 (d, J=8.4 Hz, 2H), 2.76 (s, 3H). MS
(ESI) 311.0 (M++H).
Example 91 Synthesis of 2-(4-methoxyphenyl)-5-F(2-methyl-1,3-thiazol-4-yl)ethynyllpvridine Following the procedure and mole equivalents indicated above for Example 89, 4-methoxy phenylboronic acid (106 mg, 0.70 mmol) and 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 88 (150 mg, 0.64 mmol) were cross-coupled to obtain 2-(4-methoxyphenyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (156 mg, 80% yield) as a white solid, M.p. 125-126 C, after eluting with 2:1 hexanes:ethyl acetate from a silica gel column. 'H NMR
(CDCl3, 300 MHz) S 8.81 (d, J=1.6 Hz, 1H), 7.96 (d, J=8.8 Hz, 2H), 7.82 (dd, J=8.3 Hz, 2.2 Hz, 1H), 7.63 (d, J=8.2 Hz, 1H), 7.42 (s, 1H), 6.98 (d, J=8.8 Hz), 3.84 (s, 3H), 2.73 (s, 3H). MS (ESI) 307.0 (M++H).
Example 92 Synthesis of 2-(3-pyridyl)-5-1(2-methyl-1,3-thiazol-4-yl)ethynyllpyridine Following the procedure and mole equivalents indicated above for Example 89, pyridine-3-boronic acid (86 mg, 0.70 mmol) and 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 88 (150 mg, 0.64 mmol) were cross-coupled to obtain 2-(3-pyridyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (80 mg, 45% yield) as a pale yellow solid after eluting with 1:1 hexanes:ethyl acetate from a silica gel column. This material was then solubilized in diethyl ether (10 mL) and precipitated as the pale pink hydrochloride salt upon treatment with of I M
HCl in diethyl ether (2 mL) and trituration with fresh diethyl ether (3 x 5 mL). 'H NMR (CD3OD, 300 MHz) S
9.63 (s, 1H), 9.37 (d, J=8.2 Hz, 1H), 8.97 (s, 1H), 8.95 (d, J=5.8 Hz, 1H), 8.21-8.31 (m, 3H), 8.07 (s, 1H), 2.88 (s, 3H).
MS (ESI) 278.0 (M++H).
Example 93 Synthesis of 2-(4-pyridyl)-5-f(2-methyl-1,3-thiazol-4-yl)ethynyllpyridine Following the procedure and mole equivalents indicated above for Example 89, pyridine-4-boronic acid (86 mg, 0.70 mmol) and 2-chloro-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from 5 Example 88 (150 mg, 0.64 mmol) were cross-coupled to obtain 2-(4-pyridyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (30 mg, 17% yield) as an off-white solid after eluting with 2:1 ethyl acetate:hexanes from a silica gel column. This material was then solubilized in ether (10 mL) and precipitated as the pale yellow hydrochloride salt (M.p.>185 C, dec.) upon treatment with of 1M HCl in diethyl ether (2 mL) and trituration with fresh diethyl ether (3 x 5 mL).
'H NMR (CD3OD, 300 10 MHz) 5 9.01 (s, 1H), 8.98 (d, J=7.0 Hz, 2H), 8.85 (d, J=6.7 Hz, 2H), 8.40 (d, J=8.2 Hz), 8.22 (dd, J=8.2 Hz, 2.0 Hz, 1H), 7.94 (s, 1H), 2.88 (s, 3H). MS (ESI) 278.0 (M++H).
Example 94 Synthesis of 3-chloro-6-f(2-methyl-1,3-thiazol-4-yl)ethynyllpyridazine 3,6-Dichloropyridazine (299 mg, 2.00 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-15 thiazole from Example 77 (391 mg, 2.00 mmol) were dissolved in DMF (10 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (105 mg, 0.40 mmol), bis-triphenylphosphine palladium dichloride (140 mg, 0.20 mmol), Cul (76 mg, 0.40 mmol), tetrabutylammonium iodide (369 mg, 1.00 mmol), and triethylamine (1.01 g, 1.39 mL, 10.0 mmol) in DMF (15 mL) at 40 C. The reaction was warmed to 50 C, and 20 tetrabutylammonium fluoride (2.10 mmol, 2.10 mL of a 1.OM solution in THF) was added via syringe pump over 1.5 h. The reaction was then cooled to ambient temperature and poured into a separatory funnel containing 1:1 hexanes:ethyl acetate (200 mL) where it was washed with 50% dilute brine (3 x mL), dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1.5:1 hexanes:ethyl acetate, then recrystallized from 2:1 ethyl acetate:hexanes 25 to afford 3-chloro-6-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridazine (182 mg, 39% yield) as pale pink needle crystals, M.p. 197-198 C. 'H NMR (CDC13, 300 MHz) S 7.64 (d, J=8.8 Hz, 1H), 7.63 (s, 1H), 7.52 (d, J=8.8 Hz, 1H), 2.77 (s, 3H). MS (ESI) 235.9 (M++H).
Example 95 Synthesis of 3-f(2-methyl-1,3-thiazol-4-vl)ethynyll-6-phenylpyridazine 30 Phenylboronic acid (47 mg, 0.38 mmol) and 3-chloro-6-[(2-methyl-1,3-thiazol-yl)ethynyl]pyridazine from Example 94 (75 mg, 0.32 mmol) were dissolved in DME
(2 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (8.4 mg, 0.032 mmol), bis-triphenylphosphine palladium dichloride (11.2 mg, 0.0 16 mmol), and potassium carbonate (89 mg, 0.64 mmol) in DME (2 mL) and 35 H2O (4 mL) at 40 C. The reaction was stirred at reflux for 16 h, then cooled to ambient temperature and poured into a separatory funnel containing ethyl acetate (100 mL). The ethyl acetate layer was washed with saturated NaHCO3 (50 mL), and H2O (2 x 50 mL), then dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1:1 hexanes:ethyl acetate to afford 3-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-6-phenylpyridazine (43 mg, 49%
yield) as a white solid. 'H NMR (CDC13, 300 MHz) S 8.11 (m, 2H), 7.86 (d, J=8.8 Hz, 1H), 7.72 (d, J=8.8 Hz, 1H), 7.62 (s, 1H), 7.51-7.56 (m, 3H), 2.78 (s, 3H). MS (ESI) 278.0 (M+H).
Example 96 Synthesis of 4-f(6-phenyl-3-pyridinyl)ethynyll-1,3-thiazol-2-amine Phenylboronic acid (566 mg, 4.4.64 mmol) and 2,5-dibromopyridine (1.00 g, 4.22 mmol) were dissolved in DME (10 mL) and deoxygenated via argon bubbling for 20 min. This solution was then added via syringe to a deoxygenated solution of triphenylphosphine (111 mg, 0.42 mmol), bis-triphenylphosphine palladium dichloride (148 mg, 0.21 mmol), and potassium carbonate (1.17 g, 8.44 mmol) in DME (15 mL) and H2O (25 mL) at 40 C. The reaction was stirred at reflux for 1 h, then cooled to ambient temperature and poured into a separatory funnel containing ethyl acetate (250 mL).
The ethyl acetate layer was washed with saturated NaHCO3 (50 mL), and H2O (2 x 50 mL), then dried (MgSO4), filtered, and concentrated in. vacuo. The crude residue was chromatographed on silica gel, eluting with 14:1 hexanes:ethyl acetate to afford 5-bromo-2-phenylpyridine (783 mg, 78% yield) as a white crystalline solid.
5-Bromo-2-phenylpyridine (300 mg, 1.28 mmol) and 4-[(trimethylsilyl)ethynyl]-1,3-thiazol-2-ylamine from Example 78 (210 mg, 1.07 mmol) were added as solids to a deoxygenated solution of triphenylphosphine (56 mg, 0.21 mmol), bis-triphenylphosphine palladium dichloride (75 mg, 0.11 mmol), Cu! (41 mg, 0.21 mmol), tetrabutylammonium iodide (198 mg, 0.54 mmol), and triethylamine (540 mg, 740 L, 5.4 mmol) in DMF (15 mL) at 40 C. The reaction was warmed to 60 C, and tetrabutylammonium fluoride (1.17 mmol, 1.17 mL of a 1.OM solution in THF) was added slowly over 1 h. The reaction was then cooled to ambient temperature and poured into a separatory funnel containing 1:1 hexanes:ethyl acetate (250 mL) where it was washed with 50%
dilute brine (3 x 100 mL), dried (MgSO4), filtered, and concentrated in vacuo. The crude residue was chromatographed on silica gel, eluting with 1:1 hexanes:ethyl acetate to afford 4-[(6-phenyl-3-pyridinyl)ethynyl]-1,3-thiazol-2-amine (186 mg, 63% yield) as a pale yellow solid, M.p. 194-195 C. 'H NMR
(CD3OD, 300 MHz) S
8.74 (s, 1H), 7.91-7.96 (m, 3H), 7.78 (d, J=8.3 Hz, 1H), 7.45-7.54 (m, 3H), 6.84 (s, 1H). MS (ESI) 278.0 (M++H).
Example 97 Synthesis of 3.4 dihvdro-l-naphthalenyl trifluoromethanesulfonate To a stirred solution of a-tetralone (1.00g, 6.84 mmol) in CH2CI2 (70mL) under argon at ambient temperature was added lutidine (1.20mL, 6.84 mmol) followed by dropwise addition of trifluoromethanesulfonic anhydride (1.73mL, 10.3 mmol). The reaction mixture was stirred for lh and then concentrated in vacuo and purified by flash chromatography on silica gel eluting with 10:1 hexane:ethyl acetate to afford 3, 4 dihydro-l-naphthalenyl trifluoromethanesulfonate (1.64g, 87%
yield) as a pale yellow oil. 'H NMR (CDC13, 300MHz) 6 7.36-7.32 (m, 1H), 7.29-7.24 (m, 2H), 7.20-7.16 (m, 1H), 6.03-6.00 (m, 1H), 2.90-2.85 (m, 2H), 2.55-2.48 (m, 2H).
Example 98 Synthesis of 2-(3.4-dihvdro-l-naphthalenyl)ethynylpyridine hydrochloride A stirred suspension of Cul (159 mg, 0.834 mmol), triphenylphosphine (219 mg, 0.834 mmol), PdC12(PPh3)2 (293 mg, 0.417 mmol), and triethylamine (2.9OmL, 20.8 mmol) in DME (30mL), was degassed with a stream of argon for several min. A solution of 2-ethynyl pyridine (1.30g, 12.5 mmol) and 3, 4 dihydro-l-naphthalenyl trifluoromethanesulfonate from Example 97 (1.15g, 4.17 mmol) in DME (1 OmL) was added to the mixture. The mixture was heated to 80 C for 1.5 h. The reaction mixture was cooled to ambient temperature and filtered through a pad of CeliteT"'. The filtrate was concentrated in vacuo and the crude material was purified by flash chromatography on silica gel eluting with 8:1 then 5:1 hexane:ethyl acetate to afford 2-(3,4-dihydro-l-naphthalenyl)ethynylpyridine (798mg, 72% yield) as a pale yellow oil.
2-(3,4-Dihydro-l-naphthalenyl)ethynylpyridine (300mg, 1.29 mmol) was dissolved in diethyl ether and treated with HCl in diethyl ether (2.00 mL of a 1 M solution, 2.00 mmol). Upon addition of the HCl solution a white solid precipitated from the solution. The mixture was concentrated in vacuo the pale yellow solid was recrystallized from Methanol/diethyl ether. The mother liquor was decanted and the resulting pale yellow solid was dried under high vacuum to afford 2-(3,4-dihydro-l-naphthalenyl)ethynylpyridine hydrochloride (205mg, 18% yield) as a pale yellow solid, M.p. 153-155 C. 'H NMR (CD3OD, 300MHz) 6 8.76-8.74 (m, 1H), 8.43-8.38 (m, 1H), 8.08-8.05 (d, J=8 Hz, 1H), 7.88-7.83 (m, 1H), 7.66-7.63 (d, J=8.3 Hz, 1H), 7.31-7.18 (m, 3H), 6.91-6.88 (m, 1H), 2.88-2.82 (m, 2H), 2.54-2.47 (m, 2H). MS 232 (M+H).
Example 99 Synthesis of 5-bromo-N-methoxy-N-methylnicotinamide To a stirred solution of 5-bromonicotinic acid (2.5g, 12.4 mmol) in CH2C12 (100mL) was added N, O-dimethylhydroxylamine hydrochloride (1.44g, 14.8mmol), HOBT (1.84g, 13.6mmol), and EDC
(2.61g, 13.6 mmol) sequentially as solids followed by diisopropylethylamine (6.46mL, 37.1mmol).
The mixture was stirred at ambient temperature under argon for 1 h. The reaction mixture was concentrated in vacuo and redissolved in ethyl acetate. The organic material was washed with 1M HCl and brine (3 x 25mL), dried over MgSO4i filtered and concentrated in vacuo.
The crude material was purified by flash chromatography on silica gel eluting with 1:1 hexane:ethyl acetate to afford 5-bromo-N-methoxy-N-methylnicotinamide (2.99g, 51% yield) as a colorless oil. 1H NMR
(CDC13, 300MHz) S
8.21-8.20 (m, 1H), 7.85-7.82 (m, 1H), 7.73-7.70 (m, 1H), 3.58 (s, 3H), 3.40 (s, 3H).
Example 100 Synthesis of N-methoxy-N-methyl-5-1(2-methyl-1, 3-thiazol-4-yl)ethynyll nicotinamide A stirred suspension of CuI (257 mg, 1.35 mmol), triphenylphosphine (354 mg, 1.35 mmol), PdC12(PPh3)2 (467 mg, 0.665 mmol), tetrabutylammonium iodide (1.89g, 5.12 mmol) and triethylamine (3.57 mL, 25.6 mmol) in DMF (50mL), was degassed with a stream of argon for several minutes and warmed to 40 C. 2-Methyl-4[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (1.00g, 5.12 mmol) and 5-bromo-N-methoxy-N-methylnicotinamide from Example 99 (1.63 g, 6.65 mmol) was added to the reaction mixture. The mixture was heated to 70 C and TBAF in THE
(6.65 mL, 1.0 M
solution, 6.65 mmol) was added via syringe pump over 2 h. The reaction mixture was cooled to ambient temperature and diluted with 1:1 hexane:ethyl acetate. The organic material was washed with dilute brine (3 x 25 mL), dried over MgSO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography on silica gel (2:1 then 1:1 hexane:ethyl acetate) to afford N-methoxy-N-methyl-5-[(2-methyl-1, 3-thiazol-4-yl)ethynyl] nicotinamide (708 mg, 48% yield) as an orange oil. 1H NMR (CDC13, 300MHz) 5 8.89-8.84 (m, 2H), 8.19-8.17 (m, 11-1), 7.55-7.53 (m, 1H), 3.57 (s, 3H), 3.40 (s, 3H), 2.74 (s, 3H). MS 288 (M+H).
Example 101 Synthesis of (4-fluorophenyl){5-f(2-methyl-1,3-thiazol-4-yl)ethynyll-3-ayridinyl}methanone To a stirred solution of N-methoxy-N-methyl-5-[(2-methyl-1, 3-thiazol-4-yl)ethynyl]
nicotinamide from Example 100 (50 mg, 0.174 mmol) at ambient temperature under argon was added a solution 4-fluorophenylmagnesium bromide in THE (0.696 mL, 1.OM solution, 0.696 mmol). The reaction mixture was stirred for 24 h and then diluted with H2O. The aqueous solution was extracted with ethyl acetate (3 x 25mL). The combined organic layers were washed with brine (2 x 25mL), dried over MgSO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography on silica gel eluting with 3:1 then 2:1 hexane:ethyl acetate to afford (4-fluorophenyl){5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-pyridinyl}methanone (15 mg, 27% yield) as a pale yellow solid, M.p. 132-134 C. 1H NMR (CDC13, 300MHz) S 9.02-8.95 (m, 2H), 8.20-8.19 (m, 1H), 7.89-7.85 (m, 2H), 7.48 (s, 11-1), 7.25-7.19 (m, 2H), 2.76 (s, 3H). MS
323 (MH).
Example 102 Synthesis of (4-methoxyphenyl){5-F(2-methyl-1,3-thiazol-4-vl)ethynyll-3-pyridinyllmethanone To a stirred solution of N-methoxy-N-methyl-5-[(2-methyl-1, 3-thiazol-4-yl)ethynyl]
nicotinamide from Example 100 (50 mg, 0.174 mmol) at ambient temperature under argon was added a solution 4-anisylmagnesium bromide in THE (1.39mL, 0.5M solution, 0.696 mmol).
The reaction mixture was stirred for 24 h and then diluted with H2O. The aqueous solution was extracted with ethyl acetate (3 x 25mL). The combined organic layers were washed with brine (2 x 25mL), dried over MgSO4, filtered and concentrated in vacuo. The crude material was purified by flash chromatography on silica gel eluting with 3:1 then 2:1 hexane:ethyl acetate to afford (4-methoxyphenyl){5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-pyridinyl}methanone (13 mg, 22% yield) as a pale yellow solid, M.p. 97-99 C. 'H NMR (CDC13, 300MHz) S 8.94-8.90 (m, 2H), 8.18-8.17 (m, 1H), 7.85-7.82 (m, 2H), 7.47 (s, 1H), 7.02-6.99 (m, 2H), 3.92 (s, 3H), 2.76 (s, 3H). MS 335 (MH).
Example 103 Synthesis of 2-(2-cyclopropylethvnyl)thiazole 2-Bromo-1,3-thiazole (1.31 g, 8.0 mmol), Cul (143 mg, 0.75 mmol), PdCl2 (45 mg, 0.75 mmol), PPh3 (197 mg, 0.75 mmol), and K2CO3 (4.5 g, 33 mmol) were combined in DME (50 mL) and H2O (25 mL), and argon gas was bubbled through the suspension for several min to deoxygenate the mixture. Cyclopropyl trimethylsilylacetylene (1.8 g, 13.3 mmol) was added and the reaction was heated at reflux for 12 h. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with H2O (200 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. This material was purified by column chromatography eluting with 4:1 hexane:ethyl acetate to afford 2-(2-cyclopropylethynyl)thiazole (800 mg, 67% ) as a light brown oil.
p-Toluenesulfonic acid (1.02 g, 5.4 mmol) and 2-(2-cyclopropylethynyl)thiazole (800 mg, 5.3 mmol) were dissolved in Methanol (50 mL), and the solution was concentrated in vacuo. The resulting black viscous oil was triturated with diethylether with sonication. The diethylether layer was decanted and the remaining brown gum was dried in vacuo. Material was free based with aqueous K2C03, and extracted with ethyl acetate (2 x 75 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with 4:1 hexane:ethyl acetate to afford 2-(2-cyclopropylethynyl)thiazole (150 mg, 19%) as an oil. 'H NMR
(CDC13, 300 MHz) S 7.75 (d, J= 3 Hz, 1H), 7.25 (d, J= 3 Hz, 1H), 1.50 (m, 1H), 0.93 (m, 4H). MS (API-ES Positive) 150 (M+H).
Example 104 Synthesis of 3-(2-pyridinylethynyl)-2-cvclohexen-l-one A solution of 2-ethynylpyridine (10.3 g, 100 mmol) in THE (200 mL) was cooled to -50 C and a solution of n-BuLi (100 mmol, 2.0 M in hexane) was added slowly keeping the solution temperature 5 below -40 C. After 30 min at reduced temperature the solution became opaque, brown and slightly viscous. 3-Ethoxy-2-cyclohexen- l -one (15.4 g, 110 mmol) was added all at once and the solution was allowed to warm slowly to ambient temperature with stirring. After 12 h the dark solution was acidified with HCl (400 mmol, 2.0 M), followed after 30 min by basification with solid K2CO3. The mixture was partitioned between ethyl acetate and H2O, the H2O layer was washed with a further 10 portion of ethyl acetate, the combined organic layers were washed with H2O
(200 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with 2:1 to 1:1 hexane:ethyl acetate to afford a yellow oil (10.5 g, 53%). This material was crystallized from ethyl acetate to afford two crops of light yellow flakes (5.9 g, 30%) M.P, 74-75 C. 'H NMR (CDC13, 300 MHz) S 8.64 (m, 1H), 7.72 (m, 1H), 7.51 (m, 1H), 7.30 15 (m, IH), 6.37 (m, 1H), 2.59 (m, 2H), 2.46 (m, 2H), 2.09 (m, 2H). MS (ESI) 197 (M+).
Example 105 .Synthesis of 3-(2-pyridinylethynyl)-2-cvclohexen-l-one oxime Hydroxylamine hydrochloride (350 mg, 5.0 mmol) and KOH (560 mg, 10 mmol) were dissolved in wet ethanol (15 mL). 3-(2-Pyridinylethynyl)-2-cyclohexen- 1 -one from Example 104 (0.5 20 g, 2.5 mmol) was added and the mixture heated at reflux for 2 h. The solution was allowed to cool and the solids filtered. The ethanol soluble portion was concentrated in vacuo and the residue was purified by flash column chromatography on silica gel eluting with ethyl acetate to afford 3-(2-pyridinylethynyl)-2-cyclohexen-1-one oxime (375 mg, 70 % ) as a tan solid.
M.p. 125-127 C. 1H NMR
(CDCl3, 300 MHz) S 8.58 (m, 1H), 7.68 (m, 1H), 7.47 (m, 1H), 7.24 (m, 1H), 6.75 (s, 1H), 2.65 (m, 25 2H), 2.41 (m, 2H), 1.84 (m, 2H). MS (API-ES positive) 213 (M+H).
Example 106 Synthesis of (E, Z)-3-(2-pyridinylethynyl)-2-cyclohexene-l-one 0-methyloxime To a solution of 3-(2-pyridinylethynyl)-2-cyclohexene-l-one from Example 104 (10 mg, 0.05 mmol) in ethanol (0.3 mL) was added methoxylamine hydrochloride (30-35 wt. %
in H2O; 7 l, 0.05 30 mmol) in a 10 ml Teflon reaction tube. Piperidinomethyl polystyrene (28 mg of 3.63 mmol/g beads, 0.1 mmol) was added and the resulting suspension was heated at 80 C in an orbital shaker. After shaking at C for 16 h, the reaction was cooled to ambient temperature and chloroformate polystyrene (47.5 mg of 1.0 mmol/g beads, 0.05 mmol) was added. The reaction was allowed to shake at 40 C for 1 hour, then cooled to ambient temperature, and tris (2-aminoethyl)amine polystyrene (11 mg of 4.5 mmol/g 35 beads, 0.05 mmol) was added. The reaction was then allowed to shake at 40 C
for 1 hour, then cooled, and diethyl ether (0.3 ml) was added. The reaction was vortexed and filtered using a fitted syringe attached to a vacuum block. The collected sample was then concentrated in vacuo using a Savant rotary evaporator to afford 3-(2-pyridinylethynyl)-2-cyclohexene-l-one 0-methyloxime as a mixture of E, Z, isomers (12 mg, 90% yield) as a light brown oil. 1 H NMR (CDC13, 300 MHz) 8 8.61-8.59 (m, 111), 7.68-7.67 (m, 1H), 7.47-7.44 (m, 1H), 7.28-7.23 (m, 1H), 7.17-6.57 (m, IH), 3.90 (d J=10.9 Hz, 1H), 2.57-2.52 (m, 2H), 2.47-2.39 (m, 2H), 1.91-1.88 (m, 2H), 1.83-1.79 (m, 2H); MS
(ESI) 226.28 (M++H).
Example 107 Synthesis of (EZ)-3-(2-pyridinylethynyl)-2-cyclohexen-1-one O-ethyloxime To a solution of 3-(2-pyridinylethynyl)-2-cyclohexene-l-one from Example 104 (20 mg, 0.10 mmol) in ethanol (0.6 mL) was added O-ethylhydroxylamine hydrochloride (10 mg, 0.10 mmol) in a 10 ml Teflon reaction tube. Piperidinomethyl polystyrene (56mg of 3.63 mmol/g beads, 0.2 mmol) was added and the resulting suspension was heated at 80 C in an orbital shaker.
After shaking at 80 C for 16 h, the reaction was cooled to ambient temperature and chloroformate polystyrene (95 mg of 1.0 mmol/g beads, 0.10 mmol) was added. The reaction was allowed to shake at 40 C
for 1 hour, cooled to ambient temperature, and treated with tris (2-aminoethyl)amine polystyrene (22 mg of 4.5 mmol/g beads, 0.10 mmol). The reaction was then allowed to shake at 40 C for 1 hour, then cooled, and diethyl ether (0.6 ml) was added. The reaction was vortexed and filtered using a fritted syringe attached to a vacuum block. The collected sample was then concentrated in vacuo using a Savant rotary evaporator to afford 3-(2-pyridinylethynyl)-2-cyclohexen-l-one O-ethyloxime as a mixture of E, Z isomers (22 mg, 91% yield) as a light brown oil. 'H NMR (CDC13, 300 MHz) 8 8.61-8.59 (m, 1H), 7.70-7.63 (m, 1H), 7.47-7.43 (m, 1H), 7.28-7.23 (m, 1H), 7.22-6.58 (m, 1H), 4.20-4.10 (m, 2H), 2.56 (t J=6.6 Hz, 2H), 2.47-2.38 (m, 2H), 2.47-2.39 (m, 2H), 1.94-1.87 (m, 2H), 1.85-1.76 (m, 2H), 1.29 (t J=6.0 Hz, 3H); MS (ESI) 240.30 (M+H).
Example 108 Synthesis of E/Z-3-(2-pyridinylethynyl)-2-cyclohexen-1-one 0-allyloxime To a solution of 3-(2-pyridinylethynyl)-2-cyclohexen-l-one from Example 104 (513 mg, 2.60 mmol) in ethanol (15 mL) was added O-allylhydroxylamine hydrochloride (393 mg, 3.59 mmol).
Piperidinomethyl polystyrene (1.54 g of 3.63 mmol/g beads, 5.6 mmol) was added and the resulting suspension was heated in an oil bath at 80 C. After stirring at 80 C for 16 h, TLC analysis showed no starting 3-(2-pyridinylethynyl)-2-cyclohexen- 1 -one remaining. The reaction mixture was cooled, diluted with ether, and filtered through a glass frit to remove the resin. The filtrate was concentrated to afford a yellow oil which was purified by column chromatography eluting with hexane, 20:1, 9:1, then 8.5:1.5 hexane:ethyl acetate to afford E,Z-3-(2-pyridinylethynyl)-2-cyclohexen-l-one O-allyloxime (550 mg, 83% yield) as a light brown oil. 'H NMR (CDC13, 300 MHz) S 8.63-8.60 (m, 1H), 7.70-7.64 (m, I H), 7.48-7.44 (m, I H), 7.28-7.22 (m, I H), 6.60-6.59 (m, 1H), 6.07-5.96 (m, I H), 5.36-5.22 (m, 2H), 4.64-4.59 (m, 2H), 2.62-2.58 (m, 114), 2.49-2.40 (m, 2H), 1.95-1.78 (m, 2H); MS (ESI) 253.1 (M++H).
Example 109 Synthesis of (Z)-methyl-f3-(2-pyridinylethynyl)-2-cyclohexen-l-ylidenelethanoate Trimethylphosphonoacetate (462 mg, 2.5 mmol) was dissolved in THE (20 mL) and the solution was cooled to 0 C at which time LiHDMS (2.6 mL, 1.0 M in THF) was added slowly. After 30 min 3-(2-pyridinylethynyl)-2-cyclohexen-1-one from Example 104 (0.5 g, 2.5 mmol) was added and the solution was allowed to warm to ambient temperature. After a further 3 h the mixture was partitioned between ethyl acetate and H2O, the aqueous layer was washed with a further portion of ethyl acetate, the combined organic layers were washed with H2O (50 mL), brine (30 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography eluting on silica gel with 1.5:1 then 1:1 hexane:ethyl acetate to yield methyl-[3-(2-pyridinylethynyl)-2-cyclohexen-1-ylidene]ethanoate as a mixture of E and Z double bond isomers.
This mixture was further purified by reverse phase HPLC to obtain a major isomer and a minor isomer. The major isomer was identified as the Z-isomer based on the lack of NOESY correlation between the two vinyl protons. MP 65-68 C; 1H NMR (CDC13, 300 MHz) 8 8.60 (d, J=5 Hz, 1H), 7.98 (m, 1H), 7.67 (m, 1H), 7.47 (m, 1H), 7.23 (m, 1H), 5.57 (s, 1H), 3.73 (s, 3H), 2.44 (m, 3H), 1.84 (m, 3H); MS (API-ES
positive) 254 (M+H).
Example 110 Synthesis of 2-ff(3S)-3-methyl-l-cvclopenten-l-vllethynvl}pyridine & 2-ff(4S)-4-methyl-1-cyclopenten-l-yll ethynyll pyrid ine To a solution of 2-ethynylpyridine (0.6 mL, 6.0 mmol) in THE (2 mL) at -40 C
was added n-butyllithium (3.75 mL, 6.0 mmol). After stirring at reduced temperature for 30 min the solution was added rapidly to a solution of (R)-(+)-3-methylcyclopentanone (0.65 mL, 6.0 mmol) in THE (10 mL).
The mixture was allowed to warm to ambient temperature over 16 h, then partitioned between H2O and ethyl acetate. The organic layer was dried over anhydrous Na2SO4, and concentrated in vacuo. The crude product was purified by flash column chromatography on silica gel eluting with 1:1 hexane:ethyl acetate to afford (R)-(+)-3-methyl-l-(2-pyridinylethynyl)cyclopentanol as a dark oil. This material was dissolved in pyridine/CH2C12 (10 mL, 1/1), POC13 (0.55 mL, 6.0 mmol) was added, and the mixture was heated to reflux for 4 h. After cooling, the POC13 and pyridine were removed in vacuo, and the residue was partitioned between H2O and ethyl acetate. The organic layer was dried over anhydrous Na2SO4, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with 2:1 hexane:ethyl acetate to afford 2-{[(3S)-3-methyl-l-cyclopenten-1-yl]ethynyl}pyridine and 2-{[(4S)-4-methyl-l-cyclopenten-1-yl]ethynyl}pyridine (0.425 g, 38% ) as a dark brown oil. 'H
NMR (CDC13, 300 MHz) 8 8.57 (d, J=9 Hz, 1H), 7.63 (m, 1H), 7.42 (m, 1H), 7.20 (m, 1H), 6.17 (m, 1H), 2.90 (m, 0.5H), 2.61 (m, 2H), 2.16 (m, 2H), 1.47 (m, 0.5H), 1.06 (d, J=12 Hz, 3H). GC/MS two peaks 11.88 and 11.91 min. (ESI) 182 (M+).
Example 111 Synthesis of 2-1(3,5-dimethvl-l-cvclohexen-l-yI)ethynyllpyridine The procedure was carried out as for Example 110 using 3,5-cis-dimethylcyclohexanone (756 mg, 6.0 mmol), to give 2-[(3,5-dimethyl-l-cyclohexen-1-yl)ethynyl]pyridine (0.325 g, 25% ) as a yellow oil. 'H NMR (CDC13, 300 MHz) 6 8.57 (m, 1H), 7.63 (m, 1H), 7.41 (m, 1H), 7.18 (m, 1H), 6.15 (m, 1H), 2.27 (m, 2H), 1.79 (m, 3H), 1.01 (m, 7H). GC/MS 12.96 min. (ESI) 211 (M+).
Example 112 Synthesis of 2-f(3,4-dimethvl-l-cyclopenten-l-yl)ethynyllpyridine The procedure was carried out as for Example 110 using 3,4-dimethylcyclopentanone (672 mg, 6.0 mmol), to yield a mixture of cis and trans 2-[(3,4-dimethyl-1-cyclopenten-1-yl)ethynyl]pyridine (0.51 g, 43% ) as a yellow oil. 'H NMR (CDC13, 300 MHz) S 8.57 (m, 1 H), 7.63 (m, 1H), 7.43 (m, 1H), 7.19 (m, I H), 6.14 (m, I H), 2.64-2.80 (m, 2H), 2.43 (m, I H), 2.22 (m, 1H), 1.89 (m, 1H), 1.07 (m, 3H), 0.94 (m, 3H). GC/MS two peaks 12.15 and 112.44 min. (ESI) 196 (M+).
Example 113 Synthesis of -{15-(trifluoromethyl)-1-cvclohexen-l-vllethynyl}pyridine & 2-{13-(trifluoromethyl)-1-cvclohexen-l-yll ethynyl}pyridine The procedure was carried out as for Example 110 using 3-trifluoromethylcyclohexanone (960 mg, 6.0 mmol), to yield a 3:1 mixture of 2-{[5-(trifluoromethyl)-1-cyclohexen-1-yl]ethynyl}pyridine and 2-{[3-(trifluoromethyl)-1-cyclohexen-1-yl]ethynyl}pyridine (0.51 g, 43% ) as a brown oil. 'H
NMR (CDC13, 300 MHz) S 8.57 (m, 1H), 7.65 (m, 1H), 7.43 (m, 1H), 7.21 (m, 1H), 6.32 (m, 0.75H), 6.21 (m, 0.25H), 2.98 (m, 0.25H), 2.25-2.57 (m, 3.5H), 2.01 (m, 2H), 1.58 (m, 1H), 1.29 (m, 0.25H).
GC/MS three peaks 12.22, 12.37 and 12.49 min. (ESI) 251 (M+), 252 (M+H).
Example 114 Synthesis of 2-(1,4,4a,5,6,7,8,8a-octahvdro-2-naphthalenylethynyl)pyridine and 2-(3,4,4a,5,6,7,8,8a-octahvdro-2-naphthalenylethynyl)pyridine The procedure was carried out as for Example 110 using cis/traps 2-decalone (1.83 g, 12 mmol) to yield a mixture of four stereoisomers each of 2-(1,4,4a,5,6,7,8,8a-octahydro-2-naphthalenylethynyl)pyridine & 2-(3,4,4a,5,6,7,8,8a-octahydro-2-naphthalenylethynyl)pyridine (0.50 g, 9%) as a brown oil. 1H NMR (CDC13, 300 MHz) 8 8.57 (d, J=5 Hz, 1H), 7.63 (m, 1H), 7.37 (m, 1H), 7.18 (m, IH), 6.27 (m, 0.5H), 6.20 (m, 0.5H), 2.05-2.34 (m, 3H), 1.79 (m, 3H), 1.48 (m, 7H), 1.00 (m, 1H). MS (API-ES positive) 238 (M+H).
Example 115 Synthesis of 2-1(3-methyl-l-cyclohexen-l-yl)ethynyl]pyridine A solution of 3-methyl-2-cyclohexen-l-one (990 mg, 9.0 mmol) in THE was chilled to -78 C
and L-selectride (9.5 mmol, 1.0 M in THF) was added slowly via syringe. After 1 h at reduced temperature N-phenyltriflimide (3.2 g, 9.0 mmol) was added all at once. The reaction was allowed to warm to ambient temperature while stirring overnight. The reaction was diluted with two volumes of hexane, and the organic phase was washed with H2O, then 10% aqueous NaOH and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with hexane to afford 3-methyl-l-cyclohexen-1-yl trifluoromethanesulfonate (400 mg, 18% ).
3-methyl-l-cyclohexen-1-yl trifluoromethanesulfonate (400 mg, 1.6 mmol), CuI
(30 mg, 0.15 mmol), PdC12 (9 mg, 0.05 mmol), PPh3 (40 mg, 0.15 mmol), and K2CO3 (552 mg, 4.0 mmol) were combined in DME (15 mL) and H2O (15 mL), and argon gas was bubbled through the suspension for several min to deoxygenate the mixture. 2-Ethynylpyridine (412 mg, 4.0 mmol) was added and the reaction mixture was stirred at ambient temperature for 16 h and then heated at reflux for 1 h. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with H2O (100 mL), brine (50 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with 3:1 hexane:ethyl acetate to afford 2-[(3-methyl-l-cyclohexen-1-yl)ethynyl]pyridine (250 mg, 80%) as a clear oil containing 5% of a regioisomer.'H NMR (CDCl3, 300 MHz) S 8.56 (m, 1H), 7.62 (m, 1H), 7.40 (m, 1H), 7.18 (m, 1H), 6.18 (m, 1H), 2.31 (m, 1H), 2.21 (m, 2H), 1.79 (m, 2H), 1.55 (m, 1H), 1.18 (m, I H), 1.02 (d, J=7 Hz, 3H). MS (API-ES positive) 198 (M+H).
Example 116 Synthesis of 5-methyl-l-cyclohexen-l-yl trifluoromethanesulfonate To a solution of 5-methyl-1,3-cyclohexanedione (1.0 g, 7.9 mmol) in ethanol (25 mL) was added p-toluenesulfonic acid (85 mg, 0.5 mmol), and the reaction was heated to 60 C for 16 h. The reaction was cooled and concentrated in vacuo. The residue was purified by flash column chromatography on silica eluting with hexane to give 3-ethoxy-5-methyl-2-cyclohexen-l-one (1.2 g, quantitative yield) as a clear oil.
3-Ethoxy-5-methyl-2-cyclohexen-l-one (1.2 g, 7.8 mmol) was dissolved in THE
(25 mL).
LiAlH4 (3.5 mmol, 1.OM in THF) was added, and the reaction was allowed to stir at ambient temperature for 3 h. H2SO4 (10% aqueous, 25 mL) was added slowly and the mixture was partitioned between H2O and ethyl acetate. The organics were concentrated in vacuo to give 5-methyl-2-cyclohexen-l-one (715 mg, 83%) as a clear oil.
A solution of 5-methyl-2-cyclohexen-l-one (715 mg, 6.5 mmol) in THE was chilled to -78 C
and L-selectride (6.0 mmol, 1.0 M in THF) was added slowly via syringe. After I h at reduced 5 temperature N-phenyltriflimide (1.8 g, 5.0 mmol) was added all at once. The reaction was allowed to warm to ambient temperature while stirring overnight. The reaction was diluted with two volumes of hexane, and the organics were washed with H2O, then 10% aqueous NaOH and concentrated in vacuo.
The residue was purified by flash column chromatography on silica gel eluting with hexane to afford 5-methyl-1-cyclohexen-1-yl trifluoromethanesulfonate (450 mg, 28% ). 'H NMR
(CDC13, 300 MHz) S
10 5.74 (m, I H), 2.34 (m, I H), 2.20 (m, 2H), 2.02 (m, I H), 1.90 (m, I H), 1.70 (m, I H), 1.23 (m, 1H), 1.03 (d, J=6.5 Hz, 3H). MS (EI ionization) 244 (M+).
Example 117 Synthesis of 2-f(5-methyl-l-cyclohexen-l-yl)ethynyl]pyridine 5-Methyl-l-cyclohexen-l-yl trifluoromethanesulfonate (450 mg, 1.8 mmol), CuI
(57 mg, 0.3 15 mmol), PdC12 (18 mg, 0.1 mmol), PPh3 (79 mg, 0.3 mmol), and K2CO3 (640 mg, 4.7 mmol) were combined in DME (20 mL) and H2O (20 mL), and argon gas was bubbled through the suspension for several min to deoxygenate the mixture. 2-Ethynylpyridine (484 mg, 4.7 mmol) was added and the reaction stirred at ambient temperature for 16 h, then heated at reflux for 1 h. The mixture was filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates 20 were concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with H2O
(100 mL), brine (50 mL), dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with 3:1 hexane:ethyl acetate to afford 2-[(5-methyl-1-cyclohexen-1-yl)ethynyl]pyridine (290 mg, 82%) as a light yellow oil.
'H NMR (CDCl3, 300 MHz) S 8.56 (m, 1H), 7.62 (m, 1H), 7.40 (m, 1H), 7.17 (m, 1H), 6.31 (m, 1H), 2.33 (m, 1H), 2.20 (m, 25 2H), 1.89 (m, 1H), 1.71 (m, 2H), 1.22 (m, 1H), 0.99 (d, J= 6.5 Hz, 3H).
Example 118 Synthesis of 3-(2-pyridinylethynyl)-2-cvclohexen-l-ol 3-(2-Pyridinylethynyl)-2-cyclohexen- 1 -one from Example 104 (294 mg, 1.5 mmol) and CeC13 heptahydrate (381 mg, 1.0 mmol) were dissolved in CH3OH (16 mL). NaBH4 (127 mg, 3.4 mmol) was 30 added portionwise over 5 min. After 15 min. the reaction was quenched with H2O and partitioned between H2O and ethyl acetate. The organics were washed with aq. NH4Cl, dried over Na2SO4i filtered and concentrated in vacuo. The residue was purified by column chromatography eluting with 1:1 hexane:ethyl acetate to afford a clear oil (275 mg, 92% ).
p-Toluenesulfonic acid (263 mg, 1.4 mmol) and 3-(2-pyridinylethynyl)-2-cyclohexen-l-ol (275 mg, 1.4 mmol) were dissolved in ethanol:Methanol (1:1, 40 mL), and the solution was concentrated in vacuo. The resulting viscous oil was triturated with diethylether and sonicated. The diethylether layer was decanted and remaining oil was dried in vacuo. This material was free based with aqueous K2CO3, and extracted with ethyl acetate (2 x 35 mL), dried over Na2SO4, filtered and concentrated in vacuo.
The residue was purified by column chromatography silica gel eluting with 3:2 hexane:ethyl acetate to afford 3-(2-pyridinylethynyl)-2-cyclohexen-l-ol (160 mg, 57% ) as a clear oil.
'H NMR (CDC13, 300 MHz) S 8.57 (m, 1H), 7.65 (m, 1H), 7.42 (m, 1H), 7.22 (m, 1H), 6.33 (m, 1H), 4.32 (m, 1H), 2.25 (m, 2H), 2.13 (m, 1H), 1.87 (br in, 2H), 1.63 (m, 2H). MS (API-ES Positive) 199 (M+).
Example 119 Synthesis of 4, 6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate To a stirred solution of 4,6-dimethyl-2-hydroxypyrimidine (5.0 g, 40 mmol) in anhydrous CH2C12 (100 mL) was added triethylamine (11.2 mL, 80 mmol), followed by slow addition of trifluoromethanesulfonic anhydride (6.8 mL, 40 mmol) at 0 C under argon. The reaction mixture was allowed to warm to 22 C and stirred overnight. The reaction mixture was then diluted with CH2Cl2 (100 mL). The organic phase was washed with sat. NaC1 (3 x 20 mL), dried (MgSO4), filtered and concentrated under reduced pressure to give a dark oil. Purification by flash chromatography on silica gel eluting with 3:1 hexane:ethyl acetate afforded 4, 6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate as a brown oil (6.0 g, 58%). 'H NMR (CDC13) S: 7.10 (s, 1 H), 2.45 (s, 6 H).
Example 120 Synthesis of 4,6-dimethvl-2-(phenylethynyl)pyrimidine hydrochloride A stirred solution of 4, 6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate from Example 119 (5.0 g, 19.5 mmol) in 2:1 DME:H20 (100 mL) was degassed with argon for 10 min.
Then K2CO3 (6.7 g, 48.8 mmol), Cul (0.37 g, 1.95 mmol), PdC12(Ph3P)2 (0.68 g, 0.98 mmol) and phenylacetylene (5.4 mL, 48.8 mmol) were added at 22 C. The resulting mixture was then heated at 90 C for 2 h under argon. The reaction mixture was then cooled to 22 C and filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure to give, after purification by flash chromatography on silica gel eluting with 3:1 hexane:ethyl acetate, the desired compound as a brown crystal which was subsequently treated with a solution of 1M HCl in diethyl ether (20 mL) to yield 4,6-dimethyl-2-(phenylethynyl)pyrimidine hydrochloride as a yellow solid (3.0 g, 55%). M.P
149-150 C. 'H NMR
(CD3OD) S: 7.76-7.73 (m, 2 H), 7.67 (s, 1 H), 7.60-7.49 (m, 3 H), 2.69 (s, 3 H) ppm; MS(ES): 209 (M+H)+.
Example 121 Synthesis of 3-(6-methyl-2-pyridinyl)2-propyn-l-ol A solution of 2-bromo-6-methylpyridine (2.5 g, 14.5 mmol) in 2:1 DME:H2O (30 mL) was degassed with argon for 10 min. Then PdC12(Ph3P)2 (1.0 g, 1.4 mmol), Cul (0.8 g, 4.3 mmol), K2CO3 (5.0 g, 36.3 mmol) were added followed by propargyl alcohol (2.1 mL, 36.3 mmol). The resulting mixture was heated at 90 C under argon for 2 h, allowed to cool to 22 C, then filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel eluting with 2:1 ethyl acetate:hexane to give the cross-coupled product 3-(6-methyl-2-pyridinyl)2-propyn-l-ol as a yellow solid (1.0 g, 47%). 'H NMR
(CDC13) S: 7.58-7.53 (m, 1 H), 7.27-7.25 (d, J = 7.5 Hz, I H), 7.13-7.10 (d, J = 7.8 Hz, 1 H), 4.54 (s, 2 H), 2.55 (s, 3 H).
Example 122 Synthesis of 3-(6-methyl-2-pyridinyl)-2-propynyl methanesulfonate To a stirred solution of 3-(6-methyl-2-pyridinyl)2-propyn-l-ol from Example 121 (1.0 g, 6.8 mmol) in anhydrous CH2C12 (20 mL) was added triethylamine (1.0 mL, 7.5 mmol) followed by methanesulfonyl chloride (0.6 mL, 7.5 mmol) at 0 C under argon. After 2 h the reaction mixture was diluted with CH2C12 (50 mL), the organic phase was washed with sat. NaHCO3 (3 x 10 mL) and sat.
NaCl (3 x 10 mL), dried (MgSO4), filtered and concentrated under reduced pressure to afford 3-(6-methyl-2-pyridinyl)-2-propynyl methanesulfonate as a brown oil (1.4 g, 89%) that was used in the next step without further purification. 'H NMR (CDC13) S: 7.68-7.62 (m, 1 H), 7.28 (d, J = 7.5 Hz, 1 H), 7.15 (d, J = 7.8 Hz, 1 H), 4.55 (s, 2 H), 3.09 (s, 3 H), 2.57 (s, 3 H).
Example 123 Synthesis of 2-methyl-6-(3-phenyl-l-propynyl)pyridine To a stirred solution of 3-(6-methyl-2-pyridinyl)-2-propynyl methanesulfonate from Example 122 (1.2 g, 5.3 mmol) in anhydrous THE (10 mL) under argon at 0 C was added phenylmagnesium bromide (2.1 mL, 6.4 mmol). The reaction mixture was then warmed to 22 C, stirred for 1 h then diluted with ethyl acetate (50 mL). The organic phase was washed with sat.
NaHCO3 (3 x IOmL), H2O
(3 x 10 mL) and sat. NaCI (3 x 10 mL), dried (MgSO4), filtered and concentrated under reduced pressure to give a dark oil. Purification by flash chromatography on silica gel eluting with 4:1 hexane: ethyl acetate to afford 2-methyl-6-(3-phenyl-l-propynyl)pyridine as a brown oil (360 mg, 33%).
'H NMR (CDC13) 6: 7.54-7.50 (m, 1 H), 7.37-7.19 (m, 5 H), 7.09-7.06 (d, J =
7.8 Hz, 1 H), 6.93-6.90 (d, J = 7.5 Hz, 1 H), 3.79 (s, 2H), 2.55 (s, 3H).
Example 124 Synthesis of 2-methyl-6-(3-phenyl-1.2-propadienvl)pyridine To a stirred solution of 2-methyl-6-(3-phenyl-l-propynyl)pyridine from Example 123 (100 mg, 0.48 mmol) in anhydrous THE (10 mL) at -78 C under argon was slowly added n-BuLi (2.5 M in hexane, 0.23 mL, 0.58 mmol). The resulting reddish reaction mixture was stirred for 30 min, then quenched with Methanol (1 mL). The reaction mixture was then warmed to 22 C
and taken up in ethyl acetate (50 mL). The organic phase was washed with H2O (3 x 15 mL) and sat.
NaC1(3 x 15 mL), dried (MgSO4), filtered and concentrated under reduced pressure. Purification by flash chromatography on silica gel eluting with 6:1 hexane:ethyl acetate afforded 2-methyl-6-(3-phenyl-1,2-propadienyl)pyridine as a yellow oil (40 mg, 40%). MS(ES): 208 (M+H)+, 'H NMR (CDC13) S: 7.51-7.45 (m, 1 H), 7.39-7.21 (m, 6 H), 6.99-6.96 (d, J = 7.5 Hz, 1 H), 6.77-6.75 (d, J = 6.6 Hz,1 H), 6.65-6.62 (d, J = 6.6 Hz, .1 H), 2.55 (s, 3 H).
Example 125 Synthesis of methyl 2-11(trifluoromethyl)sulfonylloxy}-1-cyclopentene-l-carboxylate To a stirred solution of methyl 2-oxocyclopentane carboxylate (5.0 g, 35.2 mmol) in anhydrous CH2C12 under argon at 0 C (40 mL) was added NaH (60 % in oil, 1.4 g, 35.2 mmol). After stirring for 10 min the resulting yellow cloudy suspension was treated with trifluoromethanesulfonic anhydride (7.1 mL, 42.2 mmol). The reaction mixture was then warmed to 22 C and after 2 h the reaction was treated with 10% HCl (100 mL). The aqueous phase was extracted with CH2C12 (3 x 40 mL), the combined organic extracts were washed with sat. NaCI (3 x 50 mL), dried (MgSO4), filtered and concentrated. The resulting residue was purified by flash chromatography on silica gel eluting with 20:1 hexane:ethyl acetate to afford methyl 2-{[(trifluoromethyl)sulfonyl]oxy}-1-cyclopentene-l-carboxylate as a colorless oil (6.5 g, 67%). 'H NMR (CDC13) S: 3.80 (s, 3 H), 2.78-2.69 (m, 4 H), 2.00-2.00 (m, 2 H).
Example 126 Synthesis of methyl 2-(2-pyridinylethynyl)-1-cyclopentene-1-carboxvlate A solution of methyl 2-{[(trifluoromethyl)sulfonyl]oxy)-1-cyclopentene-l-carboxylate from Example 125 (2.0 g, 7.2 mmol) in DMF at 22 C was degassed with argon for 10 min. Triethylamine (2.5 mL, 18 mmol), Cu! (0.41 g, 2.2 mmol), PdC12(Ph3P)2 (0.5 g, 0.72 mmol), n-Bu4NI (8.0 g, 21.6 mmol) and 2-ethynylpyridine (1.9 g, 18.0 mmol) were added at 22 C and the resulting mixture was heated at 90 C for 2 h under argon. The reaction mixture was allowed to cool to 22 C and filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure to give, after purification by flash chromatography on silica gel eluting with 4:1 hexane:ethyl acetate, methyl 2-(2-pyridinylethynyl)-1-cyclopentene-l-carboxylate as a brown solid (1.2 g, 72 %).
M.P. 45-46 C.
MS(ES): 228 (M+H)+,'H NMR (CDC13) S: 8.63-8.61 (m, 1 H), 7.68-7.65 (m, 1 H), 7.55-7.53 (m, 1 H), 7.26-7.23 (m, 1 H), 3.81 (s, 3 H), 2.81-2.75 (m, 4 H), 2.01-1.90 (m, 2 H).
Example 127 Synthesis of 2-(2-pyridinylethylnyl)-1-cyclopentene-l-carboxylic acid To a solution of methyl 2-(2-pyridinylethynyl)-1-cyclopentene-l-carboxylate from Example 126 (1.0 g, 4.4 mol) in 3:1 Methanol:H20 (20 ml) was added LiOH.H2O (0.55 g, 13.2 mmol). After stirring at 22 C for 5 h the reaction mixture was treated with 10% HCl (100 mL). The aqueous phase was extracted with CH2C12 (3 x 40 mL) and the combined organic extracts were washed with sat. NaCl (3 x 50 mL), dried (MgSO4), filtered and concentrated under reduced pressure to give a crude solid.
Purification by flash chromatography on silica gel eluting with 10:1 CH2CI2:CH3OH afforded 2-(2-pyridinylethylnyl)-1-cyclopentene-l-carboxylic acid as a gray solid (330 mg, 35%). M.P. 151-152 C.
MS(ES): 214 (M+H)+, 'H NMR (CD3OD) S: 8.53-8.50 (m, 1 H), 7.88-7.82 (m 1 H), 7.62-7.59 (m, 1 H), 7.43-7.38 (m, 1 H), 2.81-2.72 (m, 4 H), 2.06-1.96 (m, 2 H).
Example 128 Synthesis of 1{12-(2-pyridinylethylnyl)-1-cyclopentene-l-vllcarbonvl}piperidine hydrochloride To a stirred solution of 2-(2-pyridinylethylnyl)-1-cyclopentene-l-carboxylic acid from Example 127 (100 mg, 0.47 mmol) in CH2CI2 (2 mL) was added HOBT (95 mg, 0.70 mmol), EDCI
(135 mg, 0.70 mmol), triethylamine (0.2 mL, 1.4 mmol) and piperidine (0.07 mL, 0.70 mmol) at 22 C.
The reaction mixture was stirred for 18 h, then diluted with CH2CI2 (50 mL).
The organic phase was washed with sat. NaHCO3 (2 x 25 mL) and sat. NaCl (2 x 25), dried (MgSO4), filtered and concentrated in vacuo to give a yellow oil. Purification by flash chromatography on silica gel eluting with 1:1 hexane:ethyl acetate afforded 1 {[2-(2-pyridinylethylnyl)-1-cyclopentene-1-yl]carbonyl}piperidine as a yellow oil which was treated with 1M HCI in diethyl ether (5 mL) to yield 1 {[2-(2-pyridinylethylnyl)-1-cyclopentene-1-yl]carbonyl}piperidine hydrochloride as a yellow foam (40 mg, 27%). MS(ES): 281 (M+H)+, 'H NMR (CDC13) 6: 8.75 (br, 1 H), 8.21 (br, 1 H), 7.74-7.73 (m, 2 H), 3.71 (m, 2 H), 3.53 (m, 2 H), 2.84-2.79 (m, 4 H), 2.11-2.05 (m, 2 H), 1.69-1.61 (m, 6 H).
Example 129 Synthesis of 1-methyl-4-{12-(2-pyridinylethylnyl)-1-cyclopentene-l-vllcarbonvl}piperazine hydrochloride To a stirred solution of 2-(2-pyridinylethylnyl)-1-cyclopentene-l-carboxylic acid from Example 127 (100 mg, 0.47 mmol) in CH2C12 (2 mL) was added HOBT (95 mg, 0.70 mmol), EDCI
(135 mg, 0.70 mmol), triethylamine (0.2 mL, 1.4 mmol) and 1-methylpiperazine (123 mg, 0.70 mmol) at 22 C. The reaction mixture was stirred for 18 h and then diluted with an additional amount of CH2C12 (50 mL). The organic phase was washed with sat. NaHCO3 (2 x 25 mL) and sat.
NaCl (2 x 25), dried (MgSO4), filtered and concentrated in vacuo to give a yellow oil. Purification by flash chromatography on silica gel eluting with 10:1 CH2C12:CH3OH afforded 1-methyl-4-{[2-(2-pyridinylethylnyl)-1-cyclopentene-1-yl]carbonyl}piperazine as a yellow oil which was treated with 1M HCl in diethyl ether (5 mL) to yield 1-methyl-4-{[2-(2-pyridinylethylnyl)-1-cyclopentene-1-yl]carbonyl}piperazine 5 hydrochloride as a yellow foam (130 mg, 78%). MS(ES): 296 (M+H)+,'H NMR
(CDC13) S: 8.66 (br, 1 H), 8.31 (br, 1 H), 7.82 (br, 2 H), 4.75 (m, 1 H), 4.10 (m, 2 H), 3.80 (m, 3 H), 3.36 (m, 2 H), 3.07 (s, 3 H), 2.79 (m, 4 H), 2.15 (m, 2 H).
Example 130 Synthesis of 4-(4-pyrimidinyl)phenyl trifluoromethanesulfonate 10 To a stirred solution of 4-(4-pyrimidinyl)phenol (250 mg, 1.45 mmol) in anhydrous CH2C12 (100 mL) was added triethylamine (0.4 mL, 2.9 mmol) followed by slow addition of trifluoromethanesulfonic anhydride (0.25 mL, 1.45 mmol) at 0 C under argon.
The reaction mixture was allowed to warm to 22 C and stirred overnight and then diluted with CH2C12 (100 mL). The organic phase was washed with sat. NaCl (3 x 20 mL), dried (MgSO4), filtered and concentrated under 15 reduced pressure to give a dark oil. Purification by flash chromatography on silica gel eluting with 4:1 hexane:ethyl acetate afforded 4-(4-pyrimidinyl)phenyl trifluoromethanesulfonate a brown oil (210 mg, 48%). MS(ES): 305 (M+H)+, 'H NMR (CDC13) S: 9.31-9.30 (d, J = 1.2 Hz, 1 H), 8.85-8.83 (m, I H), 8.22-8.19 (m, 2 H), 7.73 (m, 1 H), 7.46-7.43 (m, 2 H).
Example 131 20 Synthesis of 4-14-f(2-methyl-1,3-thiazol-4-yl)ethynyl]phenyl}pyrimidine A stirred solution of 4-(4-pyrimidinyl)phenyl trifluoromethanesulfonate from Example 130 (200 mg, 0.66 mmol) in DMF (8 mL) was degassed with argon for 10 min.
PdC12(Ph3P)2 (46 mg, 0.07 mmol), Cul (38 mg, 0.2 mmol), triethylamine (0.23 mL, 1.64 mmol) and n-Bu4NBr 243 mg, 0.66 mmol) were added, followed by 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 25 (169 mg, 0.86 mmol). The reaction mixture was heated at 70 C under argon and then TBAF (1.0 M in THF, 0.86 mL, 0.86 mmol) was added slowly over 20 min. The reaction mixture was allowed to cool to 22 C, then filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel eluting with 1:1 hexane:ethyl acetate to give the cross-coupled product 4-{4-[(2-methyl-1,3-thiazol-4-yl)ethynyl]phenyl}pyrimidine as a yellow 30 solid. This material was treated with 1 M HCI in diethyl ether to afford a yellow solid (130 mg, 51%).
M.P. 190-192 C. MS(ES): 278 (M+H)+, 'H NMR (CD3OD) S: 9.53 (br, 1 H), 9.12 (br, 1 H), 8.57 (m, 1 H), 8.47 (s, 1 H), 8.45 (s, 1 H), 7.92 (s, I H), 7.84 (s, 1H), 7.81 (s, 1 H), 2.81 (s, 3 H).
Example 132 Synthesis of 3-bromo-5-1(2-methyl-1,3-thiazol-4-yl)ethynyllpyridine & 3,5-bisl(2-methyl-1,3-thiazol-4-yl)ethynyll pyridine A solution of 3,5-dibromopyridine (5.1 g, 21.5 mmol) in DMF (100 mL) was degassed with argon for 10 min. PdC12(Ph3P)2 (0.75 g, 1.1 mmol), Cul (0.61 g, 3.2 mmol) and triethylamine (3.7 mL, 26.9 mmol) were added followed by 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (2.1 g, 10.7 mmol). The reaction mixture was heated at 73 C under argon. Then TBAF (1.0 M in THF, 11.8 mL, 11.8 mmol) was added slowly over 20 min. The reaction mixture was allowed to cool to 22 C, filtered through a pad of CeliteTM and the filtrate was concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel eluting with 4:1 hexane:ethyl acetate to give two cross-coupled products: 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine as a white solid (1.7 g, 57%), M.P. 123-124 C, MS(ES): 280 (M+H)+, 'H NMR (CDC13) S: 8.69-8.68 (d, J =
1.7 Hz, 1 H), 8.63-8.23 (d, J = 2.2 Hz, 1 H), 7.99-7.98 (m, 1 H), 7.46 (s, 1 H), 2.76 (s, 3 H) ppm; and 3,5-bis[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine as a yellow solid (160 mg 5 %), M.P.
171-172 C, MS(ES):
322 (M+H)+,'H NMR (CDC13) S: 8.72-8.71 (m, 2 H), 7.95 (m, I H), 7.46 (s, 2 H), 2.76 (s, 6 H).
Example 133 Synthesis of 3-(3-pyridinyl)-5-F(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine hydrochloride A solution of 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 132 (75 mg, 0.27 mmol) in THE (15 mL) was degassed with argon for 10 min. Pd(Ph3P)4 (15 mg, 0.013 mmol), KOH (45 mg, 0.81 mmol) and n-Bu4NBr (43 mg, 0.13 mmol) were added, followed by diethyl(3-pyridyl)borane (51 mg, 0.35 mmol). The reaction mixture was heated at reflux for 5 h under argon, then allowed to cool to 22 C and filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel eluting with 2:1 ethyl acetate:hexane to give 3-(3-pyridinyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine as a brown oil.
This material was treated with 1 M HCl in diethyl ether to yield 3-(3-pyridinyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine hydrochloride as a yellow solid (60 mg, 58%).
M.P. 164-166 C. MS(ES):
278 (M+H)+, 'H NMR (CDC13) S: 8.97 (m, 1 H), 8.90 (d, 1.5 Hz, 1 H), 8.83-8.82 (d, 2.1 Hz, 1 H), 8.80-8.77 (m, 2 H), 8.30 (m, I H), 8.11 (m, 1 H), 7.82 (m, 1 H), 7.52 (s, 1 H), 7.27 (s, 1 H), 2.78 (s, 3 H).
Example 134 Synthesis of 3-(4-pyridinyl)-5-1(2-methyl-1,3-thiazol-4-yl)ethynyllpyridine hydrochloride A solution of 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 132 (48 mg, 0.17 mmol) in 2:1 DME:H2O (30 mL) was degassed with argon for 10 min.
Pd(Ph3P)4 (10 mg, 0.009 mmol), K2CO3 (59 mg, 0.43 mmol) and n-Bu4NBr (48 mg, 0.15 mmol) were added, followed by pyridine-4-boronic acid (32 mg, 0.26 mmol). The reaction mixture was heated at 90 C under argon for 1 h, then allowed to cool to 22 C, filtered through a pad of CeliteTM and the filtrate was concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel eluting with 2:1 ethyl acetate:hexane to give 3-(4-pyridinyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine as a colorless oil. This material was treated with 1 M HCl in diethyl ether to afford 3-(4-pyridinyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine hydrochloride as a yellow solid (20 mg, 30%). M.P. 115-117 C. MS(ES): 278 (M+H)+, 'H NMR (CD3OD) S: 9.48 (br, I H), 9.28 (br, 1 H), 9.18 (s, 1 H), 9.09 (s, 2 H), 8.63 (s, 2 H), 8.08 (s, 1 H), 2.83 (s, 3 H).
Example 135 Synthesis of 5-{5-f(2-methyl-1,3-thiazol-4-vl)ethynyll-3-pyridinyl)pyrimidine hydrochloride A solution of 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 132 (100 mg, 0.36 mmol) in 2:1 DMF:H20 (5 mL) was degassed with argon for 10 min.
Pd(Ph3P)4 (21 mg, 0.018 mmol), K2CO3 (124 mg, 0.9 mmol) and n-Bu4NBr (115 mg, 0.36 mmol) were added, followed by 5-pyrimidinylboronic acid (67 mg, 0.54 mmol). The reaction mixture was heated at 90 C under argon for 1 h, then allowed to cool to 22 C and filtered through a pad of CeliteTM.
The filtrate was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel eluting with 2:1 ethyl acetate:hexane to give 5-{5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-pyridinyl}pyrimidine as a colorless oil. This material was treated with I M
HCl in diethyl ether to afford 5-{5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-pyridinyl}pyrimidine hydrochloride as a yellow solid (20 mg, 30%). M.P. 135-137 C. MS(ES): 279 (M+H)+, 'H NMR (CD3OD) 8: 9.37-8.77 (m, 5 H), 7.97 (m, I H), 7.73 (m, 1 H), 2.78-2.77 (d, J = 1.6 Hz, 3 H).
Example 136 Synthesis of 3-(3,5-dimethyl-4-isoxazolyl)-5-1(2-methyl-1,3-thiazo-4-yl)ethynyllpyridine hydrochloride A solution of 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 132 (100 mg, 0.36 mmol) in 2:1 DMF:H20 (5 mL) was degassed with argon for 10 min.
Pd(Ph3P)4 (21 mg, 0.018 mmol), K2C03 (124 mg, 0.9 mmol) and n-Bu4NBr (115 mg, 0.36 mmol) were added followed by 3,5-dimethyl-4-isoxazolylboronic acid (78 mg, 0.54 mmol). The reaction mixture was heated at 90 C under argon overnight, allowed to cool to 22 C and filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure and the residue purified by flash chromatography on silica gel eluting with 2:1 hexane:ethyl acetate to give 3-(3,5-dimethyl-4-isoxazolyl)-5-[(2-methyl-1,3-thiazo-4-yl)ethynyl]pyridine as a yellow solid. This material was treated with 1 M HCl in diethyl ether to afford 3-(3,5-dimethyl-4-isoxazolyl)-5-[(2-methyl-1,3-thiazo-4-yl)ethynyl]pyridine hydrochloride as a yellow solid (19 mg, 13%). MS(ES): 296 (M+H)+, 'H NMR (CD3OD) S: 9.20-8.81 (m, 3 H), 8.01 (br, 1 H), 2.80 (s, 3 H), 2.58 (s, 3 H), 2.39 (s, 3 H).
Example 137 Synthesis of 3-(4-methoxyphenyl)-5-[ -methyl-1.3-thiazol-4-yl)ethynyflpyridine hydrochloride A solution of 3-bromo-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine from Example 132 (100 mg, 0.36 mmol) in 2:1 DMF:H20 (5 mL) was degassed with argon for 10 min.
Pd(Ph3P)4 (21 mg, 0.018 mmol), K2CO3 (124 mg, 0.9 mmol) and n-Bu4NBr (115 mg, 0.36 mmol) were added followed by 4-methoxyphenylboronic acid (82mg, 0.54 mmol). The reaction mixture was heated at 90 C under argon for 1 h, then allowed to cool to 22 C and filtered through a pad of CeliteTM. The filtrate was concentrated under reduced pressure and the residue was purified by flash chromatography on silica gel eluting with 1:1 hexane:ethyl acetate to give 3-(4-methoxyphenyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine as a yellow solid. This material was treated with 1 M HC1 diethyl ether to afford 3-(4-methoxyphenyl)-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine hydrochloride as a yellow foam (90 mg, 66%). MS(ES): 307 (M+H)+, 'H NMR (CD3OD) S: 9.12 (s, 1 H), 9.00-8.98 (m, 2 H), 7.96 (s, 1 H), 7.84 (s, 1 H), 7.81 (s, 1 H), 7.17 (s, 1 H), 7.14 (s, 1 H), 3.89 (s, 3 H), 2.76 (s, 3 H).
Using the synthetic and purification procedures described in Examples 132 to 137, and using the appropriate reagents, compounds described in Examples 138 to 145 were prepared.
Example 138 3-[(2-Methyl-1,3-thiazol-4-yl)ethynyl]-5-(2-thienyl)pyridine Isolated as an off white solid. M.P 175-176 C. MS(ES): 283 (M+H)+, 'H NMR
(CD3OD) S:
9.16 (br, 1 H), 8.92-8.91 (m, 2 H), 7.96 (s, I H), 7.86-7.84 (m, 1 H), 7.77-7.75 (m, 1 H), 7.28-7.26 (m, 1 H), 2.78 (s, 3 H).
Example 139 3-(2-Furyl)-5-[(2-methyl-1,3-thiazol-4-yl ethynyl]pyridine Isolated as a colorless glass. MS(ES): 267 (M+H)+, 'H NMR (CDC13) S: 8.87 (m, 1 H), 8.64 (m, 1 H), 8.10-8.08 (m, 1 H), 7.54-7.54 (m, 1 H), 7.46 (s, 1 H), 8.78-6.77 (m, 1 H), 6.53 (m, 1 H), 2.76 (s, 3 H).
Example 140 3-[(2-Methyl-1,3-thiazol-4-yl ethynyll-5- 4-(trifluoromethyl,)phenyl]pyridine Isolated as an off-white foam. MS(ES): 267 (M+H)+, 'H NMR (CD3OD) 8: 9.13 (br, 1 H), 9.02 (br, 1 H), 8.85 (br, 1 H), 8.03 (s, 1 H), 8.00 (s, 1 H), 7.91 (s, 2 H), 7.88 (s, 1 H), 2.75 (s, 3 H).
Example 141 3-(1-Benzothien-2-yl)-5-[(2-methyl-1,3-thiazol-4-yl ethynyllpyridine Isolated as an off-white solid. MS(ES): 333 (M+H)+,'H NMR (CD3OD) S: 9.12 (br, 1 H), 8.84 (br, 1 H), 8.70 (s, 1 H), 8.03 (s, 1 H), 7.92-7.90 (m, 3 H), 7.45-7.42 (m, 2 H), 2.76 (s, 3 H).
Example 142 3-(2-Methyl-1,3-thiazol-4-yl)-5-(1H-pyrazol-3-yl)pyridine Isolated as an off-white solid. M.P. 184-186 C, MS(ES): 267 (M+H)+, 'H NMR
(CD3OD) S:
9.28 (s, I H), 9.13 (s, 1 H), 9.01 (s, 1 H), 8.03 (s, 1 H), 7.88-7.87 (d, J =
2.25 Hz, 1 H), 7.07-7.06 (d, J =
2.25 Hz, 1 H), 2.80 (s, 3 H).
Example 143 3-(2,4-Difluorophenyl)-5-(2-methyl-1,3-thiazol-4-yl)pyridine Isolated as a white solid. MS(ES): 313 (M+H)+, 'H NMR (CD3OD) S: 8.87 (br, 2 H), 8.45 (br, 1 H), 7.86 (s, 1 H), 7.72-7.68 (m, 1 H), 7.24-7.16 (m, 2 H), 2.74 (s, 3 H) Example 144 3-(4-Fluorophenyl)-5-(2-methyl-1,3-thiazol-4-yl)pyridine Isolated as a low melting/hygroscopic solid. MS(ES): 295 (M+H)+, 'H NMR
(CD3OD) 6: 9.16 (m, 1 H), 9.06 (m, 1 H), 9.10 (m, 1 H), 7.96 (s, I H), 7.93-7.89 (m, 2 H), 7.39-7.33 (m, 2 H), 2.76 (s, 3 H).
Example 145 3-(2-methyl-1,3-thiazol-4-yl) -5-phenylpyridine Isolated as a hygroscopic solid. MS(ES): 277 (M+H)+, 'H NMR (CD3OD) S: 9.10 (br, 2 H), 8.76 (s, 1 H), 7.90 (s, 1 H), 7.82-7.79 (m, 2 H), 7.60-7.54 (m, 3 H), 2.75 (s, 3 H).
Example 146 Synthesis of 2-fluorocyclohexanone To a stirred solution of (1-cyclohexen-1-yloxy)(trimethyl)silane (3.5 g, 21 mmol) in dry MeCN
(200 mL) under argon was added Selectfluor reagent (8.0 g, 23 mmol). The mixture was stirred at ambient temperature for 3 h, then stored at -20 C overnight, at which time GC/MS showed the reaction to be complete. The mixture was diluted with ethyl acetate (600 mL), washed with dilute brine (300 mL) and then saturated brine (100 mL), dried over Na2SO4, and concentrated in vacuo. The resulting liquid was purified by Kugelrohr distillation (130 C air bath at 20 Ton:) to afford 2-fluorocyclohexanone (1.6 g, 67%) as a clear, colorless oil. 'H NMR (CDCl3, 300 MHz) S 4.90 (ddd, JI )=49.1 Hz, J2=11.3 Hz, J3=6.4 Hz, 1H), 2.61-1.67 (m, 8H). MS (EI
ionization) 116 (M).
Example 147 Synthesis of 2-fluoro-l-1(trimethylsilyl)ethynyllcyclohexanol A solution of n-BuLi (7.6 mL, 2.2M in hexanes, 17 mmol) was added slowly at -40 C to a stirred solution of trimethylsilylacetylene (2.3 mL, 16 mmol) in dry THE (30 mL) under argon. The mixture was stirred at -40 C for 20 min, cooled to -78 C, then a solution of 2-fluorocyclohexanone from Example 146 (1.6 g, 14 mmol) in dry THE (20 mL) was added via syringe.
The mixture was warmed to ambient temperature gradually over 1 h and then stirred at ambient temperature for 4 h.
Analysis of the reaction mixture by GC/MS at this time showed the reaction to be complete. The reaction was quenched by the addition of saturated aqueous NH4C1 (20 mL), stirred for 5 min, then 5 poured into H2O (50 mL), and extracted with ethyl acetate (3 x 30 mL). The combined organic layers were washed with H2O (30 mL), brine (30 mL), dried over Na2SO4, filtered and concentrated in vacuo to afford 2-fluoro-l-[(trimethylsilyl)ethynyl]cyclohexanol (3.4 g, 97%) as a light brown oil as a mixture of diastereomers. 'H NMR (CDC13, 300 MHz) 6 1.89-1.25 (m, 10H), 0.15 (s, 9H).
MS (EI ionization) 214 (M+).
10 Example 148 Synthesis of 2-fluoro-1-(1,3-thiazol-2-ylethynyl)cvclohexanol PdC12 (45 mg, 0.25 mmol) was suspended in DME (20 mL), then argon was bubbled through the solution for several min to deoxygenate it. H2O (6.6 mL), K2C03 (4.5 g, 32 mmol), CH3OH (20 mL), 2-bromo-1,3-thiazole (2.63 g, 16.1 mmol), PPh 3 (280 mg, 1.07 mmol) and Cul (204 mg, 15 1.07mmol) were then added and the reaction mixture was heated to 50 C.
After a few min 2-fluoro-l-[(trimethylsilyl)ethynyl]cyclohexanol from Example 147 (2.3 g, 11 mmol) was added to the dark brown suspension. The reaction was then heated to 60 C and after 16 h at 60 C, GC/MS
showed no remaining 2-bromo-1,3-thiazole. The reaction mixture was concentrated in vacuo, diluted with ethyl acetate (200 mL), and filtered through CeliteTM. The filter pad was then thoroughly washed with ethyl acetate and 20 the combined filtrates were washed with H2O (200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel on silica gel eluting with hexane, 9:1, then 7.5:2.5 hexane:ethyl acetate to afford 2-fluoro-l-(1,3-thiazol-2-ylethynyl)cyclohexanol (1.1 g, 45%) as a yellowish solid, and a 5:1 mixture of diastereomers. 'H NMR
(CDC13, 300 MHz) S 7.83 (d, J=3 Hz, 1H), 7.37 (d, J=3 Hz, 1H), 4.80-4.33 (m, 1H), 3.06 (s, 1H), 2.21-25 1.23 (m, 6H). MS (EI ionization) 225 (M+).
Example 149 Synthesis of 3-ethoxy-5-methyl-2-cyclohexen-l-one A solution of 5-methyl-1,3-cyclohexanedione (9.83 g, 77.9 mmol) and TsOH=H20 (636 mg, 6 wt.%) in ethanol (80 mL) was heated to reflux. After 15 min, triethyl orthoformate (5 mL, 30 mmol) 30 was added. After 10min TLC showed the reaction was incomplete, and additional triethyl orthoformate (5 mL, 30 mmol) was added. After a further 10 min GC/MS showed the reaction to be complete. The reaction mixture was concentrated in vacuo, then diluted with diethylether (300 mL) and washed with NaHCO3, H2O (300 mL), brine (2 x 300 mL), dried over Na2SO4i and filtered. The filtrate was concentrated in vacuo, to afford 3-ethoxy-5-methyl-2-cyclohexen-l-one as an yellowish-orange oil (11.04 g, 92%).'H NMR (CDC13i 300MHz) S 5.34 (s, 1H), 3.94-3.86 (m, 2H), 2.44-1.95 (m, 6H), 1.36 (t, J=7 Hz, 3H), 1.08 (d, J=6 Hz, 3H). MS (El ionization) 154 (M+).
Example 150 Synthesis of 5-methyl-3-(2-pyridinylethynyl)-2-cyclohexen-l-one A solution of n-BuLi (8 mL, 2.2M in hexanes, 18 mmol) was added slowly at 0 C
to a stirred solution of diisopropylamine (2.8 mL, 19 mmol) in dry THE (20 mL) under argon.
The mixture was stirred at 0 C for 30 min then a solution of 2-ethynylpyridine (2.27 g, 22.0 mmol) in dry THE (20 mL) was added via syringe. The mixture was stirred at 0 C for 1 h, then 5-methyl-3-ethoxy-2-cyclohexene-1-one from Example 149 (2.0 g, 13 mmol) was added. After stirring for 16 h at ambient temperature GCIMS showed the reaction was complete. The reaction mixture was quenched by the addition of saturated aqueous NH4Cl (100 mL), stirred for 5 min and poured into H2O (50 mL), and extracted with ethyl acetate (3 x 100 mL). The combined organic layers were washed with H2O
(100 mL), brine (100 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The crude material was purified by column chromatography on silica gel eluting with hexane, 9:1, 4:1, then 7:3 hexane:ethyl acetate to afford 5-methyl-3 -(2-pyridinylethynyl)-2-cyclohexen- 1-one (1.0 g, 36%) as a light green solid. M.p.=
62.5-65 C. ' H NMR (CDC13, 300 MHz) S 8.64 (d, J=6 Hz, 1H), 7.74-7.68 (m, 1H), 7.51 (d, J=9 Hz, 1H), 7.32-7.26 (m, 1H), 6.37 (s, 1H), 2.67-2.50 (m, 2H), 2.33-2.09 (m, 3 H), 1.11 (d, 3H). MS (ESI) 212.0 (M++H).
Example 151 Synthesis of 3-ethoxy-5.5-dimethyl-2-cvclohexen-l-one To a solution of 5,5-dimethyl-1,3-cyclohexanedione (25.2 g, 180 mmol) in ethanol (200 mL), was added TsOH= H2O (1.06 g, 4.2 wt%), then triethyl orthoformate (30 mL, 180 mmol). The resulting pale yellow solution was then heated to reflux. After heating for 15 min the solution had turned bright orange. GCIMS analysis of the reaction after 1 h showed no starting material present. The orange-brown solution was concentrated in vacuo, diluted with ethyl acetate (300 mL), washed with saturated aqueous NaHCO3 (2 x 75 mL), brine (150 mL), dried over Na2SO4, filtered and concentrated in vacuo to afford an orange semi-solid. The crude product was purified by column chromatography on silica gel eluting with hexane, then 3:1 hexane:ethyl acetate to afford 3-ethoxy-5,5-dimethyl-2-cyclohexen-I -one (13.5 g, 44%) as an orange oil that slowly solidified. ' H NMR (CDC13, 300 MHz) S 5.34 (s, 1H), 3.90 (q, J=7.0 Hz, 2H), 2.28 (s, 1H), 2.21 (s, 1H), 1.37 (t, J=7.0 Hz, 3H), 1.08 (s, 6H). MS (El ionization) 168 (M+).
Example 152 Synthesis of 5,5-dimethyl-3-(2-pyridinylethynyl)-2-cyclohexen-l-one A solution of n-BuLi (7.0 mL, 2.2M in hexanes, 15 mmol) was added slowly at 0 C to a stirred solution of diisopropylamine (2.5 mL, 18 mmol) in dry THE (20 mL) under argon.
The mixture was stirred at 0 C for 30 min then a solution of 2-ethynylpyridine (2.1 g, 20mmol) in dry THE (20 mL) was added via syringe. The mixture was stirred at 0 C for 1 h then 3-ethoxy-5,5-dimethyl-2-cyclohexen-l-one from Example 151 (2.0 g, 12 mmol) was added and the reaction mixture was allowed to warm to ambient temperature. After 16 h at ambient temperature GC/MS showed the reaction to be complete.
The reaction was quenched by the addition of saturated aqueous NH4C1 (100 mL).
After 5 min the reaction was poured into H2O (50 mL), and extracted with ethyl acetate (3 x 100 mL). The combined organic layers were washed with H2O (100 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo. The crude material was purified by column chromatography on silica gel eluting with hexane, 9:1, then 4:1 hexane:ethyl acetate to afford 5,5-dimethyl-3-(2-pyridinylethynyl)-2-cyclohexen-l-one (0.563 g, 12%) as a red oil.' H NMR (CDC13, 300 MHz) S 8.64 (d, J=6 Hz, 1H), 7.72-7.71 (m, I H), 7.51 (d, J=6 Hz, 111), 7.28-7.27 (m, 111), 6.38 (s, 1H), 2.47 (s, 2H), 2.31 (s, 2H), 1.09 (s, 6H). MS (ESI) 226.1 (M++H).
Example 153 Synthesis of 2-[(trimethylsilyl)ethynyllbicyclo[2.2.llheptan-2-ol A solution of n-BuLi (46 mL of a 2.2M solution in hexanes, 100 mmol) was added slowly at -78 C to a stirred solution of trimethylsilylacetylene (10 g, 100 mmol) in dry THE (100 mL) under argon. The mixture was stirred at -78 C for 30 min, then a solution of bicyclo[2.2.1]heptan-2-one (norcamphor) (7.7 g, 70 mmol) in dry THE (70 mL) was added via syringe. The mixture was allowed to reach ambient temperature gradually and stirred for 1.5 hr, at which time GC/MS showed the reaction to be complete. The reaction was quenched by the addition of saturated aqueous NH4C1 (300 mL), the mixture was stirred for 5 min and poured into H20(100 mL), and extracted with ethyl acetate (3 x 300 mL). The combined organic layers were washed with H2O (100 mL), brine (100 mL), dried over Na2SO4, and filtered. The crude material was purified by column chromatography on silica gel eluting with hexane, then 20:1 hexane:ethyl acetate to afford 2-[(trimethylsilyl)ethynyl]bicyclo[2.2.1]heptan-2-ol (10 g, 47%) as a red oil. 'H NMR (CDC13, 300 MHz) S 2.06-1.31 (m, 11H), 0.16 (s, 9H). MS (El ionization) 207.
Example 154 Synthesis of 2-(1.3-thiazol-2-ylethynyl)bicyclo[2.2.llheptan-2-ol PdC12 (27 mg, 0.15mmol) was suspended in DME (20 mL), then argon was bubbled through the solution for several min to deoxygenate it. H20(1 0 mL), K2CO3 (2.5 g, 18 mmol), CH30H (20 mL), 2-bromo-1,3-thiazole (1.0 g, 6.1 mmol), PPh 3 (160 mg, 0.61 mmol) and Cul (118 mg, 0.61 mmol) were added and the reaction was heated to 50 C. After a few min 2-[(trimethylsilyl)ethynyl]-bicyclo[2.2.1]heptan-2-ol from Example 153 (1.3 g, 6.1 mmol) was added to the dark brown suspension. The reaction was heated to 60 C and allowed to stir for 16 h, at which time GC/MS showed no remaining 2-bromo-1,3-thiazole. The reaction mixture was diluted with ethyl acetate (200 mL), and filtered through CeliteTM. The filter pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with H2O (200 mL), brine (200 mL), dried over Na2SO4i and filtered.
The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, 9:1, then 4:1 hexane:ethyl acetate to afford 2-(1,3-thiazol-2-ylethynyl)bicyclo[2.2.1]heptan-2-ol (550 mg, 42%) as a red oil. 1H NMR (CDC13, 300 MHz) S 7.79 (d, J=3 Hz, 1H), 7.34 (d, J=3 Hz, 1H), 2.55-1.26 (m, 1IH). MS (EI ionization) 219.
Example 155 Synthesis of 2-(bicyclol2.2.1lhept-2-en-2-ylethynyl)-1,3-thiazole To a solution of 2-(1,3-thiazol-2-ylethynyl)bicyclo[2.2.1]heptan-2-ol from Example 154 (300 mg, 1.37 mmol) in CH2C12 (20 mL) under argon, was added a catalytic amount of 4-(dimethylamino)-pyridine, and triethylamine (0.57 mL, 4.1 mmol). After 2 min methanesulfonyl chloride (0.16 mL, 2.0 mmol) was added. After 1 h GC/MS showed the reaction to be complete. The mixture was diluted with ethyl acetate (200 mL), and washed with NaHCO3 (200 mL), H2O (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, then 98:2 hexane:ethyl acetate to afford 2-(bicyclo[2.2.I]hept-2-en-2-ylethynyl)-1,3-thiazole (203 mg, 74%) as a red oil.
1H NMR (CDC13, 300 MHz) S 7.81 (d, J=3 Hz, I H), 7.33 (d, J=3 Hz, I H), 6.55 (d, J=3 Hz, I H), 3.09 (s, I H), 2.99 (d, J=1.2 Hz, 1H) 1.81-1.67 (m, 2 H), 1.53 (d, J=8.5 Hz, 1H), 1.25-1.09 (m, 3H). MS
(ESI) 202.1 (M++H).
Example 156 Synthesis of 1-f(6-methyl-2-pyridinyl)ethynyllcyclopentanol PdC12(PPh3)2 (320 mg, 0.45 mmol) was suspended in DME (20 mL) then argon was bubbled through the solution for several min to deoxygenate it. 2-Bromo-6-methylpyridine (1.9 g, 11 mmol), triethylamine (6.3 mL, 45 mmol) and Cul (170 mg, 0.91 mmol) were added and the reaction was heated to 50 C. After a few min 1-ethynyl cyclopentanol (1.0 g, 9.1 mmol) was added to the dark brown suspension. The reaction was heated to 60 C, and after 16 h at 60 C GC/MS and TLC analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (200 mL), and filtered through CeliteTM. The filter pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with H2O (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, 9:1, 8:2, then 7:3 hexane:ethyl acetate to afford 1-[(6-methyl-2-pyridinyl)ethynyl]cyclo-pentanol (1.2 g, 57%) as a yellow solid. MS (EI ionization) 201 (M).
Example 157 Synthesis of 2-(1-cvclopenten-l-vlethynyl)-6-methylpyridine To a solution of 1-[(6-methyl-2-pyridinyl)ethynyl]cyclopentanol from Example 156 (190 mg, 1.0 mmol) in CH2C12 (10 mL) under argon was added phosphorus pentoxide (355 mg, 2.5 mmol). The mixture was allowed to stir at ambient temperature for 16 h at which time TLC
showed the reaction to be complete. The reaction was quenched by the addition of saturated aqueous Na2CO3 solution (to basic pH), stirred for 5 min, and extracted with ethyl acetate (3 x 100 mL). The combined organic layers were washed with H2O (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo.
The crude material was purified by column chromatography on silica gel eluting with hexane, then 9:1 hexane:ethyl acetate to afford 2-(1-cyclopenten-1-ylethynyl)-6-methylpyridine (110 mg, 63%) as a yellow solid. 1 H NMR (CDC13, 300 MHz) S 7.54-7.48 (m, 1H), 7.25-7.23 (m, 1H) 7.07-7.03 (m, 1H), 6.25-6.23 (m, 1H), 2.60-2.43 (m, 7H), 1.99-1.90 (m, 2H). MS (ESI) 184.1 (M++H).
Example 158 Synthesis of Racemic 2-{l(cis)-3,4-dimethyl-l-cvclopenten-l-vllethynyl}pyridine A solution of n-BuLi (16.8 mL of a 2.5M solution in hexanes, 42.0 mmol) was added gradually at 0 C to a stirred solution of diisopropylamine (5.9 mL, 42 mmol) in dry THE
(40 mL) under argon.
The mixture was stirred at 0 C for 30 min then cooled to -78 C and a solution of cis-3,4-dimethylcyclopentanone [Mori, K., Ueda, H.; Tetrahedron, (1982), pp 1227-1233]
(3.6 g, 32 mmol) in dry THE (20 mL) was added via syringe. After the mixture stirred at -78 C for 1 h a solution of N-phenyltrifluoromethanesulfonimide (13.8 g, 38.6 mmol) in dry THE (40 mL) was added via syringe during 15 min. The reaction was allowed to warm gradually to ambient temperature, and after stirring for 16 h at ambient temperature GC/MS showed no remaining cis-3,4-dimethylcyclopentanone. The reaction was quenched with NaHCO3 (2mL), DME (30 mL) was added, and argon was bubbled through the solution for several min to deoxygenate it. To the resulting solution of racemic (cis)-3,4-dimethyl-l-cyclopenten-1-yl trifluoromethanesulfonate PdC12(PPh3)2 (1.1 g, 1.6 mmol), triethylamine (22 mL, 160 mmol), Cul (1.2 g, 6.4 mmol), Ph3P (0.50 g, 1.9 mmol), and 2-ethynylpyridine (4.0 g, 38 mmol) were added, and the reaction was heated to 50 C. After stirring for 16 h at 50 C, TLC analysis showed no remaining racemic (cis)-3,4-dimethyl-l-cyclopenten-1-yl trifluoromethanesulfonate. The mixture was diluted with ethyl acetate (400 mL), and filtered through a CeliteTM pad. The filter pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with H2O (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, then 96:4 hexane:ethyl acetate to afford racemic 2-{[(cis)-3,4-dimethyl-l-cyclopenten-1-yl]ethynyl}pyridine (4.6 g, 73%) as a light brown oil. 1 H NMR (CDC13, 300 MHz) S 7.58-8.56 (m, 1H), 7.66-7.60 (m, 1H) 7.42 (d, J=9 Hz, 1H), 7.22-7.17 (m, 1H), 6.18-6.15 (m, 1H), 2.82-2.11 (m, 4H), 0.98-0.91 (m, 6H). MS
(ESI) 198.1 (M++H).
Example 159 Synthesis of 2-{1(3S,4R)-3,4-dimethyl-l-cyclopenten-l-yllethynyl}pyridine A solution of n-BuLi (6.7 mL of a 2.5M solution in hexanes, 17 mmol) was added slowly to a stirred solution of diisopropylamine (2.4 mL, 17 mmol) in dry THE (20 mL) at 0 C under argon. The 5 mixture was stirred at 0 C for 30 min then cooled to -78 C and a solution of (3S,4S)-3,4-dimethylcyclopentanone [Kokke, W. C. M. C., Varkevisser, F. A.; J. Org. Chem.
(1974), pp 1535-1539;
Heathcock, C. H., Davis, B. R., Hadley, C. R.; J. Med. Chem. (1989), pp 197-202) (1.45 g, 13.0 mmol]
in dry THE (10 mL) was added via syringe. After the mixture was stirred at -78 C for I h, a solution of N-phenyltrifluoromethanesulfonimide (5.5 g, l6mmol) in dry THE (20 mL) was added via syringe 10 during 15 min. The reaction was stirred and allowed to gradually warm to ambient temperature. After stirring for 16 h, GC/MS showed no remaining (3S,4S)-3,4-dimethylcyclopentanone. The reaction was quenched with saturated aqueous NaHCO3 (1 mL), DME (15 mL) was added, then argon was bubbled through the solution for several min to deoxygenate it. To the resulting solution of (3R,4S)-3,4-dimethyl-1-cyclopenten-1-yl trifluoromethanesulfonate PdC12(PPh3)2 (460 mg, 0.65 mmol), 15 triethylamine (9.0 mL, 65 mmol), Cul (0.50 g, 2.6 mmol), Ph3P (0.46 g, 0.65 mmol), and 2-ethynylpyridine (1.3 g, 13 mmol) were added and the reaction was heated to 50 C. After stirring for 16 h at 50 C, TLC showed no remaining (3R,4S)-3,4-dimethyl-l-cyclopenten-1-yl trifluoromethane-sulfonate. The mixture was diluted with ethyl acetate (200 mL), and filtered through CeliteTM. The filter pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with H2O
20 (200 mL), brine (200 mL), dried over Na2SO4i and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, then 98:2, then 96:4 hexane:ethyl acetate to afford 2-{[(3S,4R)-3,4-dimethyl-l-cyclopenten-1-yl]ethynyl}pyridine (1.5 g, 64%) as a yellow oil. 'H NMR (CDC13, 300 MHz) S 8.57 (m, 1H), 7.66-7.60 (m, 1H) 7.41 (d, J=9 Hz, 1H), 7.21-7.18 (m, 1H), 6.09 (d, J=3 Hz, IH), 2.74-1.85 (m, 4H), 1.09-1.04 (m, 6H). MS (ESI) 25 198.1 (M++H).
Example 160 Synthesis of Racemic 2-{1(trans)-3,4-dimethyl-l-cyclopenten-1-yllethynyl}pyridine A cis-trans mixture of 2-[(3,4-dimethyl-l-cyclopenten-1-yl)ethynyl]pyridine was separated by preparative reverse phase HPLC (Zorbax SB-C18 15cm x 21 mm x 5 m dp; Mobile phase A: 100:0.1 30 H20:TFA, Mobile phase B: 100:0.1 acetonitrile:TFA; 30% B at 20 mL/min.) The resulting trifluoroacetic acid salt of the trans isomer was suspended in aqueous K2CO3 and the resulting aqueous suspension was extracted with ethyl acetate. The aqueous layer was then saturated with solid NaCl and extracted with ethyl acetate (5 x 100 mL). The combined extracts were dried over Na2SO4, filtered, and concentrated in vacuo to afford a brown oil. The dark product was further purified by column 35 chromatography on silica gel eluting with 6:1 then 4:1 hexane:ethyl acetate to afford racemic 2-{[(trans)-3,4-dimethyl-l-cyclopenten-1-yl]ethynyl}pyridine (155.3 mg) as a pale yellow oil. 'H NMR
(CDC13, 300 MHz) S 8.58-8.56 (m, 1H), 7.66-7.59 (m, 1H), 7.43-7.40 (m, 1H), 7.22-7.16 (m, 1H), 6.12-6.10 (m, I H), 2.79-2.71 (m, 1H), 2.42-2.35 (m, I H), 2.25-2.16 (m, I H), 1.91-1.85 (m, I H), 1.07 (t, J=7.0 Hz, 6H). MS (ESI) 198.1 (M++H).
Example 161 Synthesis of 2-methyl-4-(1,3-thiazol-2-vlethynyl)-1,3-thiazole Cul (50 mg, 0.26 mmol), PdC12(PPh3)2 (93 mg, 0.13 mmol), PPh3 (70 mg, 0.26 mmol), and tetrabutylammonium iodide (377 mg, 1.02 mmol) were combined in dry DMF (20 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (0.8 mL, 5 mmol), was added, and the reaction mixture was warmed to 40 C, then a solution of 2-bromo-1,3-thiazole (218 mg, 1.32 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (200 mg, 1.02 mmol) in DMF (10 mL) added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.3 mL of a 1.OM solution in THF, 1.3 mmol) was added by syringe pump over 1 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (30 mL), filtered through CeliteTM, and the filter pad was washed thoroughly with ethyl acetate. The combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 9:1, 4:1, then 3:1 hexane:ethyl acetate to afford 2-methyl-4-(1,3-thiazol-2-ylethynyl)-1,3-thiazole (165 mg, 78%) as a brown solid. M.p.= 57-58 C. 'H
NMR (CDC13, 300 MHz) S 7.88 (d, J=3.0 Hz, IH), 7.55 (s, 1H), 7.41 (d, J=3.0 Hz, 1H), 2.76 (s, 3H).
MS (ESI) 207.0 (M++H).
Example 162 Synthesis of 4-(3-pyridinylethynyl)-1,3-thiazol-2-amine Cul (51 mg, 0.26 mmol), PdC12(PPh3)2 (93 mg, 0.13 mmol), PPh3 (70 mg, 0.26 mmol), tetrabutylammonium iodide (377 mg, 1.02 mmol) were combined in dry DMF (20 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (0.8 mL, 5 mmol), was added, the reaction mixture was warmed to 40 C, then a solution of 3-bromopyridine (210 mg, 1.32 mmol) and 4-[(trimethylsilyl)ethynyl]-1,3-thiazol-2-ylamine from Example 78 (200 mg, 1.02 mmol) in DMF (10 mL) added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.3 mL of a 1.OM solution in THF, 1.3 mmol) was added by syringe pump over 1 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (30 mL), filtered through CeliteTM, and the filter pad washed thoroughly with ethyl acetate.
The combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 4:1, 1:1, then 1:4 hexane:ethyl acetate. The product was further purified by recrystallization from hot CHC13 to afford 4-(3-pyridinylethynyl)-1,3-thiazol-2-amine (90 mg, 43%) as a brown solid. M.p.= 165-170 C. 'H NMR (CDC13, 300 MHz) S 8.65 (s, 11-1), 8.50 (d, J=6.0 Hz, 1H), 7.95-7.92, (m, 1 H), 7.47-7.44 (m, 111), 6.93 (s, 11-1). MS (EI ionization) 201.0 (M).
Example 163 Synthesis of 4-f(2-methyl-l,3-thiazol-4-vl)ethynyllisothiazole CuI (60.0 mg, 0.31 mmol), PdC12(PPh3)2 (109 mg, 0.15 mmol), PPh3 (82 mg, 0.31 mmol), and tetrabutylammonium iodide (440 mg, 1.2 mmol) were combined in dry DMF (20 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (0.8 mL, 5 mmol), was added, and the reaction mixture was warmed to 40 C, then a solution of 4-bromoisothiazole (200 mg, 1.2 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (360 mg, 1.8 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.6 mL of a 1.OM solution in THF, 1.6 mmol) was added by syringe pump over 1 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (30 mL) and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 9:1, then 4:1 hexane:ethyl acetate to afford 4-[(2-methyl-1,3-thiazol-4-yl)ethynyl]isothiazole (140 mg, 37%) as a yellow solid.
M.p.= 113-114 C. 'H
NMR (CDC13, 300 MHz) 8 8.79 (s, 11-1), 8.61 (s, 1H), 7.41 (s, 1H), 2.75 (s, 3H). MS (ESI) 207.0 (M++H).
Example 164 Synthesis of 2-methyl-4-(1,3-thiazol-4-ylethynyl)-1,3-thiazole Cul (60 mg, 0.31 mmol), PdC12(PPh3)2 (110 mg, 0.15 mmol), PPh3 (82 mg, 0.31 mmol), and tetrabutylammonium iodide (440 mg, 1.2 mmol) were combined in dry DMF (20 mL), and argon gas was bubbled through the suspension for several min to deoxygenate it.
Triethylamine (0.8 mL, 5 mmol), was added, the reaction mixture was warmed to 40 C, then a solution of 4-bromo-1,3-thiazole (200 mg, 1.2 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (360 mg, 1.8 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.6 mL of a 1.OM solution in THF, 1.6 mmol) was added via syringe pump over 1 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (30 mL) and filtered through CeliteTM, the filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 9:1, 4:1, then 3:1 hexane:ethyl acetate to afford 2-methyl-4-(1,3-thiazol-4-ylethynyl)-1,3-thiazole (112 mg, 30%) as a yellow solid. M.p.= 102-103 C. 'H
NMR (CDC13, 300 MHz) 8 8.82 (d, J=2 Hz, 1H), 7.64 (d, J=2 Hz, 1H), 7.46 (s, 1H), 2.75 (s, 3H). MS
(ESI) 207.0 (M++H).
Example 165 Synthesis of 5-f(2-methyl-1,3-thiazol-4-yl)ethynyllisothiazole Cu! (60 mg, 0.31 mmol), PdC12(PPh3)2 (110 mg, 0.15 mmol), PPh3 (82 mg, 0.31 mmol), and tetrabutylammonium iodide (440 mg, 1.2 mmol) were combined in dry DMF (20 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (0.8 mL, 5 mmol), was added, and the reaction mixture was warmed to 40 C, then a solution of 5-bromoisothiazole (200 mg, 1.2 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (360 mg, 1.8 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.6 mL of a 1.OM solution in THF, 1.6 mmol) was added by syringe pump over 1 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (30 mL) and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4i filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 9:1, then 4:1 hexane:ethyl acetate to afford 5-[(2-methyl-1,3-thiazol-4-yl)ethynyljisothiazole (160 mg, 42%) as a yellow solid.
M.p.= 79-80 C. 'H NMR
(CDC13, 300 MHz) S 8.46 (d, J=2 Hz, 1H), 7.48 (s, 1H), 7.39, (d, J=2 Hz, 1H), 2.75 (s, 3H). MS (ESI) 207.0 (M}+H).
Example 166 Synthesis of 2-(11.1'-biphenyll-4-ylethynyl)pyrimidine Cut (84 mg, 0.44 mmol), PdC12(PPh3)2 (155 mg, 0.22 mmol), PPh3 (110 mg, 0.44 mmol), and tetrabutylammonium iodide (630 mg, 1.7 mmol) were combined in dry DMF (25 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (I mL, 8 mmol), was added, and the reaction mixture was warmed to 40 C, then a solution of 4-bromobiphenyl (515 mg, 2.2 mmol) and 2-[(trimethylsilyl)ethynyl]pyrimidine from Example 81 (300 mg, 1.7 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (2.2 mL of a 1.OM
solution in THF, 2.2 mmol) was added by syringe pump over 2 h. After stirring for an additional 2 h, GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (50 ;0 mL) and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 9:1, then 8.5:1.5 hexane:ethyl acetate to afford 2-([1,l'-biphenyl]-4-ylethynyl)pyrimidine (200 mg, 46%) as a yellow solid. The product was dissolved in diethyl ether (20 mL) and HCI in diethyl 5 ether (12 mL of a 1.OM solution, 12 mmol) was added to afford a light yellow precipitate. The precipitate was filtered, and dried in vacuo to afford 2-([1,1'-biphenyl]-4-ylethynyl)pyrimidine hydrochloride (170 mg, 34%) as a yellow solid. M.p.= 135-137 C. 'H NMR (CDC13, 300 MHz) S 9.01 (d, J=6 Hz, 2H), 7.76-7.66 (m, 7H), 7.49-7.39, (m, 3H). MS (ESI) 257.0 (M+H).
Example 167 Synthesis of N'-f3-12-(2-pyridinyl)ethvnvll-2-cvclohexen-l-ylidene}-2-furohydrazide A solution of 2-furohydrazide (61 mg, 0.48 mmol) in ethanol (1 mL) was treated with acetic acid (1 drop), and 3-(2-pyridinylethynyl)-2-cyclohexen-l-one from Example 104 (86 mg, 0.44 mmol) was added as a solution in ethanol (1 mL) followed by a rinse of the flask and syringe (0.5 mL). The resulting solution was then heated in a 90 C oil bath for 45 min. The reaction solution was cooled to ambient temperature and concentrated in vacuo to afford an orange oil. The crude oil was adsorbed onto silica gel and purified by column chromatography on silica gel eluting with 40:1 CHC13:CH3OH to afford N'-{3-[2-(2-pyridinyl)ethynyl]-2-cyclohexen-1-ylidene}-2-furohydrazide (40.2 mg, 30%) as a yellow oil. The material appeared to be one component by LC/MS analysis, but showed some extra peaks in the NMR spectra possibly caused by a mixture of double bond isomers being present. 'H NMR
(CDC13, 300 MHz) S 9.56 (br s, 0.1 H), 9.33 (br s, 0.9H), 8.60 (d, 1H, J=4.7 Hz), 7.68 (t, 1H, J=8.6 Hz), 7.55-7.43 (m, 2H), 7.35-7.20 (m, 214), 6.96 (br s, 0.1H), 6.86 (br s, 0.9H), 6.56 (dd, J=1.6, 3.5 Hz, 1H), 2.67-2.62 (m, O.1H), 2.56-2.40 (m, 3.81), 2.26 (br s, 0.2H), 2.03-1.93 (m, 1.8H). MS (ESI) 306.1 (M++H).
Example 168 Synthesis of N-f4-12-(1-cvclohexen-1-vl)ethvnvll-1.3-thiazol-2-yl}benzamide To a suspension of 4-(1-cyclohexen-1-ylethynyl)-1,3-thiazol-2-ylamine tosylate from Example 41 (65 mg, 0.17 mmol) in THE (2.0 mL) was added triethylamine (0.10 mL, 0.72 mmol) to afford a yellow solution. Benzoyl chloride (40 L, 0.34 mmol) was then added to afford a suspension. After stirring for 16 h at ambient temperature, TLC and LC/MS analysis showed starting amine present. The reaction mixture was then heated in a 50 C oil bath. After 3 h at 50 C, TLC
and LC/MS analysis showed little progress in the reaction. Additional benzoyl chloride (50 L, 0.43 mmol) was added to the reaction. After stirring for 26 h after the addition of the second portion of benzoyl chloride the reaction was cooled to ambient temperature, quenched by the addition of saturated aqueous NaHCO3 (10 mL), and diluted with ethyl acetate (30 mL). The aqueous layer was extracted with ethyl acetate (2 x 10 mL), the combined organics were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo.
The crude product was purified by column chromatography on silica gel eluting with 12:1 then 10:1 hexane:ethyl acetate to afford N-{4-[2-(1-cyclohexen-1-yl)ethynyl]-1,3-thiazol-2-yl}benzamide (37 mg, 70 %) as an oil that partially solidified under high vacuum. The material was not completely pure by NMR analysis, and was then carefully purified by column chromatography on silica gel eluting with 15:1 then 12:1 hexane:ethyl acetate to afford N-{4-[2-(1-cyclohexen-1-yl)ethynyl]-1,3-thiazol-2-yl}benzamide (30 mg, 57%) as a white foam. 'H NMR (CDC13, 300 MHz) S 7.98 (d, J=7.3 Hz, 2H), 7.58 (t, J=7.3 Hz, 1H), 7.46 (t, J=7.8 Hz, 2H), 7.09 (s, 1H), 5.92-5.80 (m, 1H), 2.05-2.00 (m, 2H), 1.95-1.87 (m, 2H), 1.59-1.49 (m, 2H). MS (ESI) 309.1 (M++H), 331.0 (M++Na).
Example 169 Synthesis of 3-1(2-methyl-1,3-thiazol-4-vl)ethynyllpyridine PdCI2 (15 mg, 85 mol), and Cul (23 mg, 120 mol) were combined in DME (3 mL) under argon. H2O (1 mL) was added and argon was bubbled through the resulting dark suspension while it was warmed to 40 C in an oil bath. Triphenylphosphine (84 mg, 320 mol) was added and the argon flow was continued for 10 min. The argon flow was discontinued, solid potassium carbonate (277 mg, 2.0 mmol) was added, followed by 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (90 mg, 0.46 mmol) and 3-bromopyridine (56 pL, 0.58 mmol) as a solution in DME
(2 mL) followed by a rinse of the flask and syringe with DME (1 mL). The temperature was raised to 75 C. After 16 h there was still 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole visible by GC/MS analysis. At this time Bu4NF (1.0 mL of a 1.OM solution in THF, 1.0 mmol) was added to the reaction mixture. After 10 min GC/MS analysis showed the reaction was complete. The reaction mixture was cooled to ambient temperature, diluted with ethyl acetate (50 mL), and H2O (10 mL). The aqueous layer was extracted with ethyl acetate (2 x 10 mL), the combined organics were washed with brine (20 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The crude product was purified by column chromatography on silica gel eluting with 2:1, 1:1, then 2:3 hexane:ethyl acetate to afford product contaminated with some close-running impurities. The material was then carefully purified by column chromatography on silica gel eluting with 2:1, then 1:1 hexane:ethyl acetate to afford 3-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (48.6 mg, 52 %) as a pale brown oil that partially solidified after pumping down under high vacuum. M.p.= 75-76 C. 'H NMR (CDC13, 300 MHz) 8 9.0-8.7 (br s, 1H), 8.7-8.45 (br s, IH), 7.84 (d, J=7.9 Hz, 1H), 7.45 (s, 1H), 7.35-7.22 (m, 1H), 2.75 (s, 1H). MS (EI ionization) 200 (M+).
Example 170 Synthesis of 2,4-dimethyl-6-I(trimethylsilyl)ethynyllpyrimidine A solution of trifluoromethanesulfonic anhydride (6.5 mL, 39 mmol) was added slowly to a stirred solution of 2,4-dimethyl-6-hydroxypyrimidine (4.0 g, 32 mmol) and triethylamine (7.5 mL, 53 mmol) in dry CH2CI2 (125 mL) at 0 C under argon. The mixture was stirred at ambient temperature for 16 h at which time TLC analysis showed the reaction to be complete. The mixture was diluted with CH2C12 (200 mL), washed with saturated aqueous NaHCO3 (200 mL), brine (200 mL), dried over Na2SO4, filtered and concentrated in vacuo. Half of the residue (4 g, 16 mmol) was dissolved in DME
(10 mL), and argon was bubbled through the solution for several min to deoxygenate it.
Trimethylsilylacetylene (2.9 g, 30 mmol) was added. The resulting solution was added to a deoxygenated mixture of PdC12 (83 mg, 0.47 mmol), triethylamine (8.7 mL, 1.8 mmol), Cu! (259 mg, 1.35 mmol), and triphenylphosphine (483 mg, 1.84 mmol), in DME (20 mL) at 45 C. After stirring for 16 h at 45 C, TLC showed no remaining 2,6-dimethyl-4-pyrimidinyl trifluoromethanesulfonate. The mixture was diluted with ethyl acetate (200 mL), and filtered through CeliteTM. The filter pad was then thoroughly washed with ethyl acetate and the combined filtrates were washed with H2O (200 mL), brine (200 mL), dried over Na2SO4, and filtered. The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, 20:1, then 9:1 hexane:ethyl acetate to afford 2,4-dimethyl-6-[(trimethylsilyl)ethynyl]pyrimidine (600 mg, 18%) as a yellow oil. 1 H
NMR (CDC13, 300 MHz) S 7.10 (s, 1H), 2.69 (s, 1H), 2.48 (s, 1H), 0.26 (s, 9H).
Example 171 Synthesis of 4-(11,1'-biphenyll-4-ylethynyl)-2,6-dimethylpyrimidine CuI (73 mg, 0.38 mmol), PdC12(PPh3)2 (130 mg, 0.19 mmol), triphenylphosphine (100 mg, 0.38 mmol), and tetrabutylammonium iodide (543 mg, 1.47 mmol) were combined in dry DMF (25 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (1.0 mL, 7.4 mmol), was added, the reaction mixture was warmed to 40 C, and a solution of 4-bromo-1,1'-biphenyl (446 mg, 1.9 mmol) and 2,4-dimethyl-6-[(trimethylsilyl)ethynyl]pyrimidine from Example 170 (300 mg, 1.47 mmol) in DMF (10 mL) was added. The reaction mixture was warmed to 70 C and tetrabutylammonium fluoride (1.9 mL of a 1.0 M solution in THF, 1.3 mmol) was added by syringe pump over 2 h. After stirring for an additional 2 h, TLC and GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (50 mL) and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, then 9:1 hexane:ethyl acetate to afford 4-([1,1'-biphenyl]-4-ylethynyl)-2,6-dimethylpyrimidine (12 mg, 3%) as a yellow solid.
M.p.= 145-148 C. 'H NMR (CDC13, 300 MHz) S 7.70-7.60 (m, 5H), 7.49-7.36 (m, 4H), 7.19 (s, 1H), 2.73 (s, 3H), 2.52 (s, 3H). MS (ESI) 285.0 (M+H).
Example 172 Synthesis of 2-f(trimethylsilvl)ethynyllpyrazine PdC12 (60 mg, 0.34 mmol), Cu! (151 mg, 0.79 mmol), and triethylamine (3.8 mL, 27 mmol) were combined in DME (10 mL) under argon. Argon was bubbled through the suspension, and after 10 min triphenylphosphine (349 mg, 1.33 mmol) was added and the reaction flask was immersed in a 50 C
oil bath. The argon flow was discontinued after an additional 5 min, then trimethylsilylacetylene (2.4 mL, 17 mmol), and 2-iodopyrazine (1.66 g, 8.06 mmol) were added as a solution in DME (5 mL), followed by a rinse of the flask and syringe with DME (3 mL). After stirring for 16 h at 50 C, GC/MS
analysis of the dark brown suspension showed no 2-iodopyrazine remaining. The reaction mixture was cooled to ambient temperature, filtered, and the solids were washed thoroughly with ethyl acetate. The combined filtrates were concentrated in vacuo to afford a dark oil, which was diluted with diethylether (100 mL), and washed with saturated aqueous NaHCO3 (25 mL). The basic organic layer was extracted with diethylether (50 mL), and the combined organics were washed with brine (25 mL), dried over Na2SO4, filtered, concentrated in vacuo, then diluted with benzene and concentrated in vacuo again to remove any remaining H2O as its azeotrope. The crude material was purified by column chromatography on silica gel eluting with hexane, 30:1, then 20:1 hexane:ethyl acetate to afford 2-[(trimethylsilyl)ethynyl]pyrazine (1.2 g, 88%) as a yellow oil. ' H NMR
(CDC13, 300 MHz) S 8.89 (s, 1 H), 8.5 5 (d, J=3 Hz, 1 H), 8.49 (d, J=3 Hz, 1 H), 0.29 (s, 9H). MS (El ionization) 176 (M').
Example 173 Synthesis of 2-(11,1'-biphenyl-4-vlethynyl)pyrazine Cu! (84 mg, 0.44 mmol), PdCl2(PPh3)2 (155 mg, 0.22 mmol), triphenylphosphine (116 mg, 0.442 mmol), and tetrabutylammonium iodide (630 mg, 1.7 mmol) were combined in dry DMF (25 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it. Triethylamine (0.8 mL, 8 mmol), was added, the reaction mixture was warmed to 40 C, and a solution of 4-bromo-1,1'-biphenyl (515 mg, 2.2 mmol) and 2-[(trimethylsilyl)ethynyl]pyrazine from Example 172 (300 mg, 1.7 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (2.2 mL of a 1.0 M solution in THF, 2.2 mmol) was added by syringe pump over 2 h. After stirring for an additional 2 h, TLC and GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (50 mL) and filtered through CeliteTM.
The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O (2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, 9:1, then 8.5:1.5 hexane:ethyl acetate to afford 2-([1,1'-biphenyl]-4-ylethynyl)pyrazine (100 mg, 23%) as a yellow solid. M.p.= 112-113 C.
'H NMR (CDC13, 300 MHz) 6 8.88 (s, 11-1), 8.78 (s, 1H), 8.64 (s, 1H), 7.62-7.61 (m, 6H), 7.50-7.38 (m, 3H). MS (ESI) 257.0 (M+H).
Example 174 Synthesis of 4,6-dimethyl-2-1(trimethylsilyl)ethynyllpyrimidine PdCl2 (234 mg, 1.32 mmol), Cul (737 mg, 3.87 mmol), and triethylamine (23 mL, 165 mmol) were combined in DME (50 mL) under argon. Argon was bubbled through the suspension, and after 10 min triphenylphosphine (1.37 g, 5.22 mmol) was added and the reaction flask was immersed in a 50 C
oil bath. The argon flow was discontinued after an additional 5 min, then trimethylsilylacetylene (12 mL, 85 mmol), and 4,6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate (11.3 g, 44.1 mmol), were added as a solution in DME (10 mL) followed by a rinse of the flask and syringe with DME (10 mL).
The reaction mixture rapidly turned from a dark orange color to black as the 4,6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate solution was added. After stirring for 30 min at 50'C, GUMS
analysis of the black suspension showed no 4,6-dimethyl-2-pyrimidinyl trifluoromethanesulfonate remaining. The reaction mixture was allowed to cool to ambient temperature.
The reaction mixture was concentrated in vacuo, diluted with diethylether (200 mQ, filtered, and the solids were washed thoroughly with diethylether. The combined filtrates were washed with saturated aqueous NaHC03 (50 mL), at which time a large quantity of solids appeared. The suspension was again filtered. The two layers of the filtrate were separated, and the aqueous layer was extracted with diethylether (2 x 50 ML).
The combined organics were washed with brine, dried over Na2S04, filtered, and concentrated in vacuo.
The crude material was purified by column chromatography on silica gel eluting with hexane, 20:1, 10:1, then 8:1 hexane:ethyl acetate to afford an orange oil with some white fluffy solids present. This was diluted with hexane and filtered through a plug of CeliteTm to remove the white solids. The filtrate was concentrated in vacuo to afford 4,6-dimethyl-2-[(trimethylsilyl)ethynyl]pyrimidine (4.63 g, 51%), as an orange oil. During the elution of the column, while the desired compound was eluting, the flow rate dropped and the column plugged so that elution was no longer possible.
The silica gel from the column was slurried with ethyl acetate and CH2C12, and filtered. The silica gel was then washed thoroughly with ethyl acetate. The combined filtrates were combined and concentrated in vacuo to afford a dark oil, which was quite clean by NMR analysis showing desired product contaminated with some material exhibiting extra phenyl signals (possibly triphenylphosphine).
'H NMR (CDC13, 300 MHz) 8 6.98 (s, 1H), 2.49 (s, 3H), 0.28 (s, 9H). MS (EI ionization) 204 (M).
Example 175 Synthesis of 2-([1,1'-biphenyll-4-ylethynyo-4,6-dimethylpyrimidin Cul (84.0 mg, 0.442 mmol), PdC12(PPh3)2 (155 mg, 0.22 mmol), triphenylphosphine (116 mg, 0.44 mmol), and tetrabutylammonium iodide (630 mg, 1.7 mmol) were combined in dry DUT (25 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it. Triethylamine (0.8 mL, 8 mmol), was added, the reaction mixture was warmed to 40'C, and a solution of 4-bromo-1,1'-biphenyl (515 mg, 2.2 mmol) and 4,6-dimethyl-2-[(trimethylsilyl)ethynyl]pyrimidine from Example 174 (340 mg, 1.7 mmol) in DMF (10 mL) was added. The reaction was warmed to 70'C and tetrabutylammonium fluoride (2.2 mL of a 1.0 M solution in THF, 2.2 mmol) was added by syringe pump over 2 h. After stirring for an additional 2 h, TLC and GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (50 mL) and filtered through Celite TM . The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H20 (2 X
200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, 9:1, 8.5:1.5 hexane:ethyl acetate to afford 2-([I,I'-biphenyl]-4-ylethynyl)-4,6-dimeihylpyrimidine (180 mg, 42%) as a yellow solid. The 2-([I,I'-biphenyl]-4-ylethynyl)-4,6-dimethylpyrimidine was dissolved in diethylether (20 mL) and HCI (12 mL of a 1.0 M solution in diethylether, 12 mmol) was added.
The resulting precipitate was filtered, and crystallized from boiling ethyl acetate to afford 2-([1,1'-biphenyl]-4-ylethynyl)-4,6-dimethylpyrimidine hydrochloride (50 mg , 11%) as yellow crystals. M.p.= 163-165 C.
'H NMR (CDC13, 300 MHz) S 7.82 (d, J=3 Hz, 4H), 7.72-7.67 (m, 3H), 7.51-7.41 (m, 3H), 2.70(s, 614).
MS (ESI) 285.1 (M+H).
Example 176 Synthesis of 1-chloro-6-(trimethylsilyl)-3.5-hexadiyn-2-one Aluminum trichloride (6.85 g, 51.4 mmol) was suspended in CH2CI2 (100 mL) and cooled in an ice bath. A solution of 4-bis(trimethylsilyl)1,3-butadiyne (10.0 g, 51.4 mmol) and chloroacetyl chloride (4.1 mL, 51 mmol) in CH2CI2 (100 mL) was added to the AIC13 suspension dropwise from an addition funnel over 1 h. The dark brownish-red solution was stirred at 0 C for 1 h, then the ice bath was removed. After 1 h at ambient temperature, the reaction was cooled to 0 C and quenched by slow addition of 1M HCl (150 mL). The acidic aqueous solution was extracted with CH2C12 (2 x 300 mL), the combined organic layers were washed with H2O (500 mL), saturated aqueous NaHCO3 (500 mL), brine (500 mL) and dried over Na2SO4. The organic layer was filtered to afford a clear solution which was concentrated in vacuo. The crude 1-chloro-6-(trimethylsilyl)-3,5-hexadiyn-2-one (10 g) was used in the next step without purification. MS (El ionization) 183 (M+).
Example 177 Synthesis of 2-methyl-4-14-(trimethylsilyl)-1,3-butadiynyl-1,3-thiazole Crude 1-chloro-6-(trimethylsilyl)-3,5-hexadiyn-2-one from Example 176 (5.0 g, 25 mmol) was dissolved in DMF (70 mL), then thioacetamide (2.4 g, 33 mmol) was added in one portion. The mixture was allowed to stir for 16 h at ambient temperature, at which time TLC
showed no remaining 1-chloro-6-(trimethylsilyl)-3,5-hexadiyn-2-one. The mixture was diluted with ethyl acetate (200 mL), washed with H2O (3 x 300 mL), brine (300 mL), dried over Na2SO4, and filtered.
The filtrate was concentrated in vacuo, and the residue was purified by column chromatography on silica gel eluting with hexane, then 20:1 hexane:ethyl acetate to afford 2-methyl-4-[4-(trimethylsilyl)-1,3-butadiynyl]-1,3-thiazole (1.2 g, 24%) as reddish-brown oil.' H NMR (CDC13, 300 MHz) S 7.39 (s, 1H), 2.68 (s, 3H), 0.26 (s, 9H). MS (EI ionization)219 (M).
Example 178 Synthesis of N-hydroxybenzenecarboximidoyl chloride To a solution of syn-benzaldehyde oxime (12 g, 99 mmol) in DMF (70 mL) was added N-chlorosuccinimide (15.8 g, 118 mmol). After stirring at ambient temperature for 64 h, TLC analysis showed no starting oxime present. The reaction mixture was diluted with diethylether (600 mL), washed with a 1:1 mixture of H20:saturated aqueous NaCl (2 x 200 mL), brine (100 mL), dried over Na2SO4, filtered and concentrated in vacuo to afford an oil that was diluted with toluene and concentrated in vacuo to remove any remaining H2O. The resulting crude product was purified by column chromatography on silica gel eluting with hexane, 30:1, then 20:1 hexane:ethyl acetate to afford N-hydroxybenzenecarboximidoyl chloride (5.77 g, 37%) as white crystals. M.p.=
52-53 C. ' H NMR
(CDC13, 300 MHz) S 9.00 (s, 1H), 7.84 (d, J=6 Hz, 2H), 7.49-7.37 (m, 3H).
Example 179 Synthesis of 5-1(2-methyl-1,3-thiazol-4-vl)ethynyll-3-phenylisoxazole To a solution of 2-methyl-4-[4-(trimethylsilyl)-1,3-butadiynyl]-1,3-thiazole from Example 177 (220 mg, 1.0 mmol) in dry diethylether (20 mL) under argon, tetrabutylammonium fluoride (1.1 mL of a 1.0 M solution in THF, 1.1 mmol) was added by syringe during 15 min. After stirring for 0.5 h, TLC
and GC/MS analysis showed the reaction to be complete. Then N-hydroxybenzenecarboximidoyl chloride from Example 178 (233 mg, 1.5 mmol) was added in one portion under argon. Triethylamine (0.20 mL in 20 mL dry diethylether, 1.5 mmol) was added by addition funnel during 2 h. After stirring for an additional 2 h, TLC and GC/MS analysis showed the reaction was not complete, another 1.5 mmol of N-hydroxybenzenecarboximidoyl chloride and triethylamine was added as described above.
After stirring for an additional 2h, the mixture was diluted with diethylether (50 mL) and washed with H2O (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, then 9:1 hexane:ethyl acetate to afford 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-phenylisoxazole (195 mg, 73%) as a yellow solid. The product was dissolved in diethylether (20 mL) and HC1 (15 mL of a 1.0 M solution in diethylether, 15 mmol) was added, the resulting precipitate was filtered and washed with diethylether to give 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-phenylisoxazole (90 mg, 34%) as yellow crystals. M.p.=
118-120 C. Elemental analysis of the material for C, H, N and Cl showed the material to be the free base, not the hydrochloride salt. 'H NMR (CDC13, 300 MHz) S 7.94 (s, 1H), 7.88-7.84 (m, 2H), 7.50-7.47 (m, 3H), 7.21 (s, 1H), 2.73 (s, 3H). MS (ESI) 267.0 (M+H).
Example 180 Synthesis of Ethyl 5-1(2-methyl-1,3-thiazol-4-yl)ethynyll-3-isoxazolecarboxylate To a solution of 2-methyl-4-[4-(trimethylsilyl)-1,3-butadiynyl]-1,3-thiazole from Example 177 (150 mg, 0.68 mmol) in dry diethylether (20 mL) under argon, tetrabutylammonium fluoride (0.75 mL
of a 1.0 M solution in THF, 0.75 mmol) was added by syringe during 15 min.
After stirring for 0.5 h, TLC and GC/MS analysis showed the reaction to be complete. Then commercially available ethyl (2-E,Z)-chloro(hydroxyimino)ethanoate (155 mg, 1.0 mmol) was then added in one portion under argon.
Triethylamine (0.14 mL, 1.0 mmol) was added as a solution in dry diethylether (20 mL) by addition funnel during 2 h. After stirring for an additional 2 h, TLC and GC/MS
analysis showed the reaction was not complete. Another portion of ethyl (2-E,Z)-chloro(hydroxyimino)ethanoate (155 mg, 1.0 mmol) and triethylamine (0.14 mL, 1.0 mmol) was added as described above.
After stirring for an additional 2 h, the mixture was diluted with diethylether (50 mL) and washed with H2O (100 mL), brine (100 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, then 9:1 hexane:ethyl acetate to afford ethyl 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-isoxazolecarboxylate (120 mg, 72%) as a yellow solid. The ethyl 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]-3-isoxazolecarboxylate was dissolved in diethylether (20 mL) and HC1 (16 mL of a 1.0 M solution in diethylether, 16 mmol) was added.
The resulting precipitate was filtered and washed with diethylether to give ethyl 5-[(2-methyl-1,3-thiazol-4-yl)-ethynyl]-3-isoxazolecarboxylate (75 mg, 42%) as yellow crystals. M.p.= 125-127 C. Elemental analysis for C, H, N, and Cl showed the compound to be the free base, not the hydrochloride salt. 'H
NMR (CDC13, 300 MHz) S 8.22 (s, 1H), 7.21 (s, 1H), 4.43 (q, J=9 Hz, 2H), 2.87 (s, 3H), 1.40(t, J=6 Hz, 3H). MS (ESI) 263.0 (M+H).
Example 181 Synthesis of 2-methoxy-5-[(2-methyl-1,3-thiazol-4-yl)ethyny-Ilpyridine CuI (40 mg, 0.2 mmol), PdC12(PPh3)2 (72 mg, 0.10 mmol), triphenylphosphine (54 mg, 0.2 mmol), and tetrabutylammonium iodide (376 mg, 1.0 mmol) were combined in dry DMF (20 mL) and argon gas was bubbled through the mixture for several min to deoxygenate it.
Triethylamine (0.71 mL, 5.1 mmol) was added, the reaction mixture was warmed to 40 C, and a solution of 5-bromo-2-methoxypyridine (231 mg, 1.23 mmol) and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (200 mg, 1.0 mmol) in DMF (10 mL) was added. The reaction was warmed to 70 C and tetrabutylammonium fluoride (1.3 mL of a 1.0 M solution in THF, 1.3 mmol) was added by syringe pump over 2 h. After stirring for an additional 2 h, TLC and GC/MS analysis showed the reaction to be complete. The mixture was diluted with ethyl acetate (100 mL) and filtered through CeliteTM. The filter pad was washed thoroughly with ethyl acetate, and the combined filtrates were washed with H2O
(2 x 200 mL), brine (200 mL), dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column chromatography on silica gel eluting with hexane, 18:1, then 9:1 hexane:ethyl acetate to afford 2-methoxy-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (150 mg, 20%) as a yellow solid. The product was further purified by crystallization from boiling hexane to give 2-methoxy-5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine (120 mg, 51%) as yellow crystals.
M.p.= 110-111 C. 'H NMR
(CDC13, 300 MHz) S 8.38 (d, J=2 Hz, 1H), 7.71 (dd, J=2, 9 Hz, 1H), 7.37 (s, 1H), 6.73 (d, J=9 Hz, 1H).
MS (ESI) 230.9 (M+H).
Example 182 Synthesis of 5-[(2-methyl-1,3-thiazol-4-yl ethynyllpyrimidine PdC12 (27.8 mg, 160 mol), Cu1(77 mg, 400 mol), and triethylamine (3.0 mL, 22 mmol) were combined in DME (10 mL) under argon. Argon was bubbled through the suspension, and after 10 min triphenylphosphine (166 mg, 630 mol) was added and the reaction flask was heated on a heating mantle. The argon flow was discontinued after an additional 5 min, then 5-bromopyrimidine (830 mg, 5.2 mmol), and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (826 mg, 4.2 mmol), were added as a solution in DME (5 mL) followed by a rinse of the flask and syringe with DME
(2 mL). Tetrabutylammonium fluoride (5.0 mL of a 1.0 M solution in THF, 5.0 mmol) was then added to the reaction mixture dropwise over 10 min. After stirring for an additional 2.5 h at 65 C, GC/MS
analysis showed no remaining 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole, nor desilylated alkyne present. The reaction mixture was allowed to slowly cool to ambient temperature over 16 h, concentrated in vacuo, diluted with ethyl acetate (150 mL), H2O (50 mL) and saturated aqueous NaHCO3 (25 mL). The basic aqueous layer was extracted with ethyl acetate (2 x 50 mL). The combined organics were washed with brine (50 mL), dried over Na2SO4, filtered, and concentrated to afford a brown solid. The crude product was purified by column chromatography on silica gel eluting with hexane 3:1, 2:1, then 3:2 hexane:ethyl acetate to afford 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyrimidine (687 mg, 81 %) as a brownish-yellow solid. M.p. 118.5-119.5 C. 'H NMR
(CDC13, 300 MHz) S 9.17 (s, 1H), 8.89 (s, 2H), 7.51 (s, 1H), 2.76 (s, 3H). MS
(EI ionization) 201 (M+).
Example 183 Synthesis of 5-[(2-methyl-1,3-thiazol-4-yl)ethynyllnicotinonitrile PdC12 (25 mg, 140 mol), CuI (78 mg, 410 mol), and triethylamine (3.0 mL, 22 mmol) were combined in DME (10 mL) under argon. Argon was bubbled through the suspension, and after 10 min triphenylphosphine (150 mg, 570 mol) was added and the reaction flask was heated on a heating mantle. The argon flow was discontinued after an additional 5 min, then 5-bromonicotinonitrile (980 mg, 5.3 mmol), and 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole from Example 77 (867 mg, 4.4 mmol), were added as a solution in DME (5 mL) followed by a rinse of the flask and syringe with DME
(2 mL). Tetrabutylammonium fluoride (5.0 mL of a 1.0 M solution in THF, 5.0 mmol) was then added to the reaction mixture dropwise over 10 min. After stirring for 16 h at 55 C, GC/MS analysis showed no remaining 2-methyl-4-[(trimethylsilyl)ethynyl]-1,3-thiazole, nor desilylated alkyne present. The reaction mixture was allowed to cool to ambient temperature overnight, concentrated in vacuo, diluted with ethyl acetate (150 mL), H2O (50 mL) and saturated aqueous NaHCO3 (25 mL).
The basic aqueous layer was extracted with ethyl acetate (2 x 50 mL). The combined organics were washed with brine (50 mL), dried over Na2SO4, filtered, and concentrated to afford a brown solid.
The crude product was purified on a Biotage Flash system eluting with 100:1 CHCI3:CH30H to afford 5-[(2-methyl-1,3-thiazol-4-yl)ethynyl]nicotinonitrile (201 mg, 20 %) as a yellow solid. (there were a large number of impure fractions from the column) M.p. 173-175 C. 'H NMR (CDCl3i 300 MHz) S
8.94 (d, J=2.0 Hz, 1H), 8.82 (d, J=2.0 Hz, 1H), 8.08 (t, J=2.0 Hz, 1H), 7.52 (s, 1H), 2.77 (s, 3H). MS (EI ionization) 225 (M).
Example 184 Calcium Flux Assay The activity of compounds was examined against the hmGluR5a receptor stably expressed in mouse fibroblast Ltk- cells (the hmGluR5a/L38-20 cell line). See generally Daggett et al., Neuropharmacology 34:871-886 (1995). Receptor activity was detected by changes in intracellular calcium ([Ca+'];) measured using the fluorescent calcium-sensitive dye, fura-2. hmGluR5a/L38-20 cells were plated onto 96-well plates, and loaded with 3 p.M fura-2 for I h.
Unincorporated dye was washed from the cells, and the cell plate was transferred to a custom-built 96-channel fluorimeter (SIBIA-SAIC, La Jolla, CA) which is integrated into a fully automated plate handling and liquid delivery system. Cells were excited at 350 and 385 nm with a xenon source combined with optical filters. Emitted light was collected from the sample through a dichroic mirror and a 510-nm interference filter and directed into a cooled CCD camera (Princeton Instruments). Image pairs were captured approximately every 1 s, and ratio images were generated after background subtraction. After a basal reading of 20 s, an ECBO concentration of glutamate (10 M) was added to the well, and the response evaluated for another 60 s. The glutamate-evoked increase in [Ca+ji in the presence of the screening compound was compared to the response of glutamate alone (the positive control). Results obtained from testing certain exemplary compounds from this assay are presented in Table 1.
Example 185 Phosphatidylinositol hydrolysis (IP1) assays Inositol phophate assays were performed as described by Berridge et al ..(1982) (Berridge et al, (1982) Biochem. J. 206: 587-5950; and Nakajima et al., JBiol. Chem. 267:2437-2442 (1992)) with slight modifications. Mouse fibroblast Ltk cells expressing hmGluR5 (hmGluR5/L38-20 cells) were seeded in 24-well plates at a density of 8x105 cells/well. One p.Ci of [3H]-inositol (Amersham PT6-271;
Arlington Heights, Ill.; specific activity = 17.7 Ci/mmol) was added to each well and incubated for 16 h at 37 C. Cells were washed twice and incubated for 45 min in 0.5 ml of standard Hepes buffered saline buffer (FIBS; 125 mM NaCI, 5 mM KCI, 0.62 mM MgSO4, 1.8 mM CaCl2, 20 mM HEPES, 6 mM
glucose, pH to 7.4). The cells were washed with FIBS containing 10 mM LiCI, and 400 l buffer added to each well. Cells were incubated at 37 C for 20 min. For testing, 50 l of 10X compounds used in the practice of the invention (made in HBS/LiCI (100 mM)) was added and incubated for 10 minutes.
Cells were activated by the addition of 10 pM glutamate, and the plates left for 1 hour at 37 C.
The incubations were terminated by the addition of I ml ice-cold methanol to each well. In order to isolate inositol phosphates (IPs), the cells were. scraped from wells, and placed in numbered glass test tubes. One ml of chloroform was added to each tube, the tubes were mixed, and the phases separated by centrifugation. IN were separated on Dowex anion exchange columns (AG I-X8 100.200 mesh formate form). The upper aqueous layer (750 ul) was added to the Dowex columns, and the Trademark columns eluted with 3 ml of distilled water. The eluents were discarded, and the columns were washed with 10 mls of 60 mM ammonium formate/5 mM Borax, which was also discarded as waste. Finally the columns were eluted with 4 ml of 800 mM ammonium formate/0.1 M formic acid, and the samples collected in scintillation vials. Scintillant was added to each vial, and the vials shaken, and counted in a scintillation counter after 2 hours. Phosphatidylinositol hydrolysis in cells treated with certain exemplary compounds was compared to phosphatidylinositol hydrolysis in cells treated with control and the results are shown in Table 1.
Example 186 Analgesic Animal Model (CFA Model) Compounds that modulate receptor-mediated analgesic responses were tested in an animal model. Robust inflammation was induced by the injection of complete Freund's adjuvant (CFA, 10 mg/ml) subcutaneously into the hind paw of male Sprague-Dawley rats (150-175 g). The inflammatory response to CFA began approximately 12-hrs post-CFA injection and persisted for several days following inoculation. The inflamed hind paw became sensitive to noxious (paw pinch, plantar test) or innocuous (cold plate, Von Frey filaments) stimuli compared to the contralateral hind paw. Test compounds (240 pmol/kg) were administered via intraperitoneal injection. The analgesic activity of compounds was evaluated one to 24-hours post administration by assessing (1) the duration of analgesic effect; (2) threshold to elicit response; and (3) time from painful stimulus to response. A
general increase in duration of analgesic effect, threshold to painful stimuli or time to respond following compound administration suggested analgesic efficacy. For each group of animals, responses following administration of certain exemplary compounds were compared to responses prior to compound administration. Results are presented in Table 1.
TABLE 1*
. 51 + + +
W, 52 + + ND
+
U -~ U
54 + + +
44 + - ND 55 + + ND
45 + - ND 56 + + ND
46 + + + 57 + + ND
47 + + + 58 - - ND
48 + + ND 59 - - ND
49 + - - 60 - - ND
50 + - ND 61 - - ND
62 + - ND 114 + + ND
63 + - ND 115 + + ND
64 - - ND 117 + + ND
65 + + - 118 + + ND
66 + + ND 120 + + +
69 + + ND 126 + + ND
74 ND - ND 127 + + ND
75 + + ND 131 + + ND
79 + + + 133 + + +
80 + + + 134 + + ND
82 + + ND 135 + + -83 + - ND 136 + + ND
86 + + + 137 + + ND
87 + + ND 138 + + ND
88 + + ND 139 + + ND
89 + + + 140 + ND ND
90 + + ND 141 + + ND
91 + ND ND 142 + + ND
92 + + ND 143 + + ND
93 + + ND 144 + + ND
94 ND - ND 145 + + ND
95 + + - 148 ND + ND
96 + + ND 150 + + -98 + + ND 152 + + ND
100 + ND ND 155 + + ND
101 + + + 157 + + +
103 - ND ND 158 + + ND
104 + + ND 159 + + ND
105 + + ND 160 + + ND
106 + + ND 161 + + ND
107 + + ND 162 + + ND
108 + + - 163 + + ND
109 + + ND 164 + + ND
110 + + + 165 + + ND
111 + + + 166 + + -112 + + + 167 + + ND
113 + + - 168 + - ND
169 + + + 181 + ND ND
173 + + ND 182 + + ND
179 + + - 183 + + +
180 + + ND
*Table Legend:
Ca 2+ Flux:
+: 0.1 nmol < IC50 < 10 gmol -: IC50> 10 mol PI Hydrolysis:
+: 1.0 nmol < IC50 < 10 pmol -: IC50 > 10 mol CFA Model:
+ = analgesic efficacy - = analgesic inefficacy ND = not determined Data presented in Table 1 demonstrate that the activity of metabotropic glutamate receptor 5 (mGluR5), assessed by measuring receptor-activated changes in calcium flux, may be modulated by compounds contemplated for use in the practice of the invention. In assays using cells transfected with mGluR5a, a majority of invention compounds are effective at decreasing intracellular calcium flux, and decreasing phosphoinositol hydrolysis.
Example 187 Salt forms of 2-(Phenylethynyl)-1,3-thiazole Various salt forms of 2-(phenylethynyl)-1,3-thiazole were prepared, and their solubility, hygroscopicity, and physical state were assessed. The compound 2-phenylethynl-1,3-thiazole was prepared (see Example 8) as well as hydrochloric acid, fumaric acid, methylsulfonic acid and toluene sulfonic acid salt forms of the compound. The hydrochloric acid salt form of 2-(phenylethynyl)-1,3-thiazole is an oil. A fumaric acid salt form was not obtained by preparative steps including trituration with diethylether. Preparation of the methylsulfonate form results in a semi solid, hygroscopic material.
These salt forms are typically unsuitable for certain pharmaceutical formulations, such as for tablets, capsules, and the like. In contrast to the salt forms of 2-(phenylethynyl)-1,3-thiazole, described previously, the tosylate salt form (i.e., the toluene.sulfonic acid salt) is a solid having a melting point of about 129 up to 131 C and is non-hygroscopic. Therefore, this form is presently preferred for pharmaceutical formulations of tablets, capsules, and the like.
While the invention has been described in detail with reference to certain preferred embodiments thereof, it will be understood that modifications and variations are within the spirit and scope of that which is described and claimed.
Claims (27)
1. A compound having the structure:
A-L-B
wherein:
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
A-L-B
wherein:
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
2. A pharmaceutical composition comprising a compound as defined in claim 1 or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier therefor.
3. A compound for treating a disease condition related to the activity of metabotropic glutamate receptors, said compound having the structure A-L-B, wherein:
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
4. A compound for treating a disease condition according to claim 3, wherein said disease condition is cerebral ischemia, chronic neurodegeneration, psychiatric disorders, schizophrenia, mood disorders, emotion disorders, disorders of extrapyramidal motor function, obesity, disorders of respiration, motor control and function, attention deficit disorders, concentration disorders, pain disorders, neurodegenerative disorders, epilepsy, convulsive disorders, eating disorders, sleep disorders, sexual disorders, circadian disorders, drug withdrawal, drug addiction, compulsive disorders, anxiety, panic disorders, depressive disorders, skin disorders, retinal ischemia, retinal degeneration, glaucoma, disorders associated with organ transplantation, asthma, ischemia or astrocytomas.
5. A compound for treating a disease condition according to claim 4, wherein said mood disorder is anxiety, depression, psychosis, drug withdrawal, tobacco withdrawal, memory loss, cognitive impairment, dementia, or Alzheimer's disease.
6. A compound for treating a disease condition according to claim 4, wherein said extrapyramidal motor function is Parkinson's disease, progressive supramuscular palsy, Huntington's disease, Gilles de la Tourette syndrome, or tardive dyskinesia.
7. A compound for treating a disease condition according to claim 4, wherein said pain disorder is neuropathic pain, chronic pain, acute pain, painful diabetic neuropathy, post-herpetic neuralgia, cancer-associated pain, pain associated with chemotherapy, pain associated with spinal cord injury, pain associated with multiple sclerosis, causalgia and reflex sympathetic dystrophy, phantom pain, post-stroke (central) pain, pain associated with HIV or AIDS, trigeminal neuralgia, lower back pain, myofacial disorders, migraine, osteoarthritic pain, postoperative pain, dental pain, post-burn pain, pain associated with systemic lupus, entrapment neuropathies, painful polyneuropathies, ocular pain, pain associated with inflammation or pain due to tissue injury.
8. A compound for preventing a disease condition related to the activity of metabotropic glutamate receptors in a subject at risk thereof, having the structure A-L-B, wherein:
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
9. A compound for preventing a disease condition according to claim 8, wherein said disease is a disease of the pulmonary system, a disease of the nervous system, a disease of the cardiovascular system, a disease of the gastrointestinal system, a disease of the endocrine system, a disease of the exocrine system, a disease of the skin, cancer, or a disease of the ophthalmic system.
10. Use of a therapeutically effective amount of at least one compound having the structure A-L-B, for the manufacture of a medicament for treating a disease condition related to the activity of metabotropic glutamate receptors, wherein:
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
11. The use according to claim 10, wherein said metabotropic glutamate receptor is a Group I metabotropic glutamate receptor.
12. Use of a therapeutically effective amount of at least one compound having the structure A-L-B, for the manufacture of a medicament for treating a disease condition related to the activity of metabotropic glutamate receptors, wherein:
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
13. The use according to claim 12, wherein said disease condition is cerebral ischemia, chronic neurodegeneration, psychiatric disorders, schizophrenia, mood disorders, emotion disorders, disorders of extrapyramidal motor function, obesity, disorders of respiration, motor control and function, attention deficit disorders, concentration disorders, pain disorders, neurodegenerative disorders, epilepsy, convulsive disorders, eating disorders, sleep disorders, sexual disorders, circadian disorders, drug withdrawal, drug addiction, compulsive disorders, anxiety, panic disorders, depressive disorders, skin disorders, retinal ischemia, retinal degeneration, glaucoma, disorders associated with organ transplantation, asthma, ischemia or astrocytomas.
14. The use according to claim 13, wherein said mood disorder is anxiety, depression, psychosis, drug withdrawal, tobacco withdrawal, memory loss, cognitive impairment, dementia, or Alzheimer's disease.
15. The use according to claim 13, wherein said extrapyramidal motor function is Parkinson's disease, progressive supramuscular palsy, Huntington's disease, Gilles de la Tourette syndrome, or tardive dyskinesia
16. The use according to claim 13, wherein said pain disorder is neuropathic pain, chronic pain, acute pain, painful diabetic neuropathy, post-herpetic neuralgia, cancer associate pain, pain associated with chemotherapy, pain associated with spinal cord injury, pain associated with multiple sclerosis, causalgia and reflex sympathetic dystrophy, phantom pain, post-stroke (central) pain, pain associated with HIV or AIDS, trigeminal neuralgia, lower back pain, myofacial disorders, migraine, osteoarthritic pain, postoperative pain, dental pain, post-burn pain, pain associated with systemic lupus, entrapment neuropathies, painful polyneuropathies, ocular pain, pain associated with inflammation or pain due to tissue injury.
17. Use of a therapeutically effective amount of at least one compound having the structure A-L-B, for the manufacture of a medicament for preventing a disease condition related to the activity of metabotropic glutamate receptors, wherein A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
18. The use according to claim 17, wherein said disease is a disease of the pulmonary system, a disease of the nervous system, a disease of the cardiovascular system, a disease of the gastrointestinal system, a disease of the endocrine system, a disease of the exocrine system, a disease of the skin, cancer or a disease of the ophthalmic system.
19. A pharmaceutically acceptable salt form of a compound having the structure A-L-B, wherein:
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
and the salt is acetate, adipate, alginate, aspartate, benzoate, benzenesulfonate, butyrate, citrate, camphorate, camphorsulfonate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, fumarate, glucoheptanoate, glycerophosphate, heptanoate, hexanoate, 2-hydroxyethanesulfonate, lactate, malate, maleate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, oxalate, tartrate, toluenesulfonate, undecanoate, sulfate, bisulfate, hemisulfate, hydrochloride, hydrobromide, hydroiodide, an ammonium salt, an alkali metal salt, an alkaline earth metal salt, a dicyclohexylamine salt, N-methyl-D-glucamine, phenylethylamine, or an amino acid salt.
A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
and the salt is acetate, adipate, alginate, aspartate, benzoate, benzenesulfonate, butyrate, citrate, camphorate, camphorsulfonate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, fumarate, glucoheptanoate, glycerophosphate, heptanoate, hexanoate, 2-hydroxyethanesulfonate, lactate, malate, maleate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, oxalate, tartrate, toluenesulfonate, undecanoate, sulfate, bisulfate, hemisulfate, hydrochloride, hydrobromide, hydroiodide, an ammonium salt, an alkali metal salt, an alkaline earth metal salt, a dicyclohexylamine salt, N-methyl-D-glucamine, phenylethylamine, or an amino acid salt.
20. The pharmaceutically acceptable salt form of the compound according to claim 19, wherein the salt is a toluene sulfonic acid salt.
21. A composition for treating a disease condition related to the activity of metabotropic glutamate receptors, comprising at least one compound having the structure A-L-B, and a pharmaceutically acceptable carrier therefore, wherein A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
22. A composition for treating a disease condition according to claim 21, wherein said disease condition is cerebral ischemia, chronic neurodegeneration, psychiatric disorders, schizophrenia, mood disorders, emotion disorders, disorders of extrapyramidal motor function, obesity, disorders of respiration, motor control and function, attention deficit disorders, concentration disorders, pain disorders, neurodegenerative disorders, epilepsy, convulsive disorders, eating disorders, sleep disorders, sexual disorders, circadian disorders, drug withdrawal, drug addiction, compulsive disorders, anxiety, panic disorders, depressive disorders, skin disorders, retinal ischemia, retinal degeneration, glaucoma, disorders associated with organ transplantation, asthma, ischemia or astrocytomas.
23. A composition for treating a disease condition according to claim 22, wherein said mood disorder is anxiety, depression, psychosis, drug withdrawal, tobacco withdrawal, memory loss, cognitive impairment, dementia, or Alzheimer's disease.
24. A composition for treating a disease condition according to claim 22, wherein said extrapyramidal motor function is Parkinson's disease, progressive supramuscular palsy, Huntington's disease, Gilles de la Tourette syndrome, or tardive dyskinesia.
25. A composition for treating a disease condition according to claim 22, wherein said pain disorder is neuropathic pain, chronic pain, acute pain, painful diabetic neuropathy, post-herpetic neuralgia, cancer-associated pain, pain associated with chemotherapy, pain associated with spinal cord injury, pain associated with multiple sclerosis, causalgia and reflex sympathetic dystrophy, phantom pain, post-stroke (central) pain, pain associated with HIV or AIDS, trigeminal neuralgia, lower back pain, myofacial disorders, migraine, osteoarthritic pain, postoperative pain, dental pain, post-bum pain, pain associated with systemic lupus, entrapment neuropathies, painful polyneuropathies, ocular pain, pain associated with inflammation or pain due to tissue injury.
26. A composition for preventing a disease condition related to the activity of metabotropic glutamate receptors in a subject at risk thereof, comprising at least one compound having the structure A-L-B, and a pharmaceutically acceptable carrier therefore, wherein A is 1,3-thiazol-2-yl or 1,3-thiazol-4-yl, which is optionally substituted with:
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
halogen, substituted or unsubstituted hydrocarbyl, substituted or unsubstituted aryl, heterocyclyl, mercapto, nitro, carboxyl, carbamido, hydroxy, esteryl, cyano, amino, amido, or sulfonamide;
L is substituted or unsubstituted alkynylene; and B is substituted or unsubstituted pyridyl, thiazolyl, furyl, dihydropyranyl, or dihydrothiopyranyl;
wherein said substituent is selected from: hydroxy, alkoxy, mercapto, aryl, halogen, trifluoromethyl, pentafluoroethyl, cyano, cyanomethyl, nitro, amino, amido, carbamido, esteryl, and sulfonamide;
or a pharmaceutically acceptable salt thereof.
27. A composition for preventing a disease condition according to claim 26, wherein said disease is a disease of the pulmonary system, a disease of the nervous system, a disease of the cardiovascular system, a disease of the gastrointestinal system, a disease of the endocrine system, a disease of the exocrine system, a disease of the skin, cancer, or a disease of the ophthalmic system.
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| US09/387,073 | 1999-08-31 | ||
| US09/387,135 | 1999-08-31 | ||
| US09/387,135 US6956049B1 (en) | 1999-08-31 | 1999-08-31 | Methods of modulating processes mediated by excitatory amino acid receptors |
| PCT/US2000/023923 WO2001016121A1 (en) | 1999-08-31 | 2000-08-31 | Heterocyclic compounds and methods of use thereof |
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| CA2383524C true CA2383524C (en) | 2010-09-28 |
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| US6774138B2 (en) * | 1999-08-31 | 2004-08-10 | Merck & Co., Inc. | Thiazolyl(pyridyl)ethyne compounds |
| US7365074B2 (en) | 1999-08-31 | 2008-04-29 | Merck & Co., Inc. | Pyridazine, pyrimidine and pyrazine ethyne compounds |
| AU2956702A (en) | 2000-12-04 | 2002-06-18 | Hoffmann La Roche | Phenylethenyl or phenylethinyl derivatives as glutamate receptor antagonists |
| MXPA04010965A (en) * | 2002-05-07 | 2005-01-25 | Neurosearch As | Novel azacyclic ethynyl derivatives. |
| WO2004038374A2 (en) * | 2002-10-24 | 2004-05-06 | Merck & Co., Inc. | Alkyne derivatives as tracers for metabotropic glutamate receptor binding |
| JP4610480B2 (en) | 2003-03-07 | 2011-01-12 | アステラス製薬株式会社 | Nitrogen-containing heterocyclic derivatives having 2,6-disubstituted styryl |
| TWI292318B (en) | 2003-03-10 | 2008-01-11 | Hoffmann La Roche | Imidazol-4-yl-ethynyl-pyridine derivatives |
| UA80888C2 (en) | 2003-06-05 | 2007-11-12 | Hoffmann La Roche | Imidazole derivatives as glutmate receptor antagonists |
| WO2005118568A1 (en) * | 2004-06-01 | 2005-12-15 | F. Hoffmann-La Roche Ag | Pyridin-4-yl-ethynyl-imidazoles and pyrazoles as mglu5 receptor antagonists |
| US7531529B2 (en) | 2003-06-05 | 2009-05-12 | Roche Palo Alto Llc | Imidazole derivatives |
| WO2004111040A1 (en) * | 2003-06-12 | 2004-12-23 | F. Hoffmann-La Roche Ag | Heteroaryl-substituted imdazole derivatives as glutamate receptor antagonists |
| US7452909B2 (en) * | 2003-09-04 | 2008-11-18 | Hoffman-La Roche Inc. | Imidazole derivatives |
| GB0322612D0 (en) * | 2003-09-26 | 2003-10-29 | Novartis Ag | Organic compounds |
| CN1870999A (en) * | 2003-10-31 | 2006-11-29 | 阿斯利康(瑞典)有限公司 | Alkynes I |
| JP2007509935A (en) * | 2003-10-31 | 2007-04-19 | アストラゼネカ アクチボラグ | Alkins II |
| JP2007509934A (en) * | 2003-10-31 | 2007-04-19 | アストラゼネカ アクチボラグ | Alkynes III |
| CA2556944C (en) * | 2004-03-05 | 2012-10-09 | Taisho Pharmaceutical Co., Ltd. | Thiazole derivative |
| US7915424B2 (en) | 2004-03-22 | 2011-03-29 | Eli Lilly And Company | Pyridyl derivatives and their use as mGlu5 antagonists |
| KR101057032B1 (en) * | 2004-06-01 | 2011-08-16 | 에프. 호프만-라 로슈 아게 | Pyridin-4-yl-ethynyl-imidazoles and pyrazoles as mglu5 receptor antagonists |
| GB0413605D0 (en) * | 2004-06-17 | 2004-07-21 | Addex Pharmaceuticals Sa | Novel compounds |
| CN101223166B (en) | 2004-10-07 | 2011-10-19 | 默沙东公司 | Thiazolyl MGLUR5 antagonists and methods for their use |
| KR101148580B1 (en) | 2006-12-21 | 2012-05-24 | 에프. 호프만-라 로슈 아게 | Polymorphs of a mglur5 receptor antagonist |
| US8420661B2 (en) * | 2010-04-13 | 2013-04-16 | Hoffmann-La Roche Inc. | Arylethynyl derivatives |
| TWI538905B (en) * | 2010-12-22 | 2016-06-21 | Ｈ 朗德貝克公司 | Bicyclo [3.2.1] octyl amide derivatives and uses of same |
| MX343701B (en) * | 2011-12-23 | 2016-11-16 | Crystal Pharma Sau | Process for alkynylating 16-substituted-17-keto steroids. |
| CN104955809B (en) | 2013-02-07 | 2018-12-11 | 普雷斯特威克化学公司 | The purposes of substituted acetylene-derivative and its positive allosteric modulators as mGluR4 |
| CN106146391A (en) * | 2015-04-15 | 2016-11-23 | 中国科学院上海药物研究所 | Substituted benzamide compound of 5-fragrance alkynyl and preparation method thereof, pharmaceutical composition and purposes |
| UA120309C2 (en) | 2015-06-03 | 2019-11-11 | Ф. Хоффманн-Ля Рош Аг | Ethynyl derivatives |
| JP2019081709A (en) * | 2016-03-18 | 2019-05-30 | 石原産業株式会社 | Pest control agent |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3705153A (en) * | 1969-05-14 | 1972-12-05 | Sumitomo Chemical Co | Novel thiazolyacetic acids and salts thereof |
| DE2426878A1 (en) * | 1974-06-04 | 1976-01-08 | Basf Ag | 3,5-Substd-1,2,4-oxadiazoles prodn - from acylamidine or guanidine salts by N-halogenation then cyclising with base |
| JPS58219169A (en) * | 1982-06-15 | 1983-12-20 | Takeda Chem Ind Ltd | Oxazoleacetic acid derivative |
| JPS62142168A (en) * | 1985-10-16 | 1987-06-25 | Mitsubishi Chem Ind Ltd | Thiazole derivative and leukotriene antagonistic agent containing said derivative as active ingredient |
| JP2745073B2 (en) * | 1989-10-27 | 1998-04-28 | チッソ株式会社 | Phenylacetylene compound |
| FR2663850B1 (en) * | 1990-07-02 | 1994-01-14 | Gird Galderma | PHARMACEUTICAL OR COSMETIC COMPOSITION CONTAINING A RETINOUIDE AND A STEROL IN COMBINATION. |
| DE4023742A1 (en) * | 1990-07-26 | 1992-01-30 | Gruenenthal Gmbh | SUBSTITUTED PHENYLACETYLENES, MEDICINAL PRODUCTS CONTAINING THEM AND METHOD FOR PRODUCING THESE COMPOUNDS AND MEDICINAL PRODUCTS |
| US5270312A (en) * | 1990-11-05 | 1993-12-14 | Warner-Lambert Company | Substituted piperazines as central nervous system agents |
| US5608082A (en) * | 1994-07-28 | 1997-03-04 | Agouron Pharmaceuticals, Inc. | Compounds useful as antiproliferative agents and GARFT inhibitors |
| AU4610896A (en) * | 1995-01-06 | 1996-07-24 | R.J. Reynolds Tobacco Company | Pharmaceutical compositions for prevention and treatment of central nervous system disorders |
| ES2201192T3 (en) * | 1995-09-07 | 2004-03-16 | F. Hoffmann-La Roche Ag | NEW 4- (OXIALCOXIFENIL) -3-OXI-PIPERIDINS FOR THE TREATMENT OF CARDIAC AND RENAL INSUFFICIENCY. |
| JPH09235276A (en) * | 1995-12-27 | 1997-09-09 | Takeda Chem Ind Ltd | Oxazole derivative, production of the same and use of the same |
| JP4056589B2 (en) * | 1996-07-19 | 2008-03-05 | 武田薬品工業株式会社 | Heterocyclic compounds, their production and use |
| TW544448B (en) * | 1997-07-11 | 2003-08-01 | Novartis Ag | Pyridine derivatives |
| ZA986594B (en) * | 1997-07-25 | 1999-01-27 | Abbott Lab | Urokinase inhibitors |
| US6340759B1 (en) * | 1997-10-02 | 2002-01-22 | Eisai Co., Ltd. | Fused pyridine derivatives |
| US6187777B1 (en) * | 1998-02-06 | 2001-02-13 | Amgen Inc. | Compounds and methods which modulate feeding behavior and related diseases |
| JP2000119253A (en) * | 1998-08-11 | 2000-04-25 | Dai Ichi Seiyaku Co Ltd | Novel sulfonyl derivative |
| AU780009B2 (en) * | 1999-08-31 | 2005-02-24 | Merck Sharp & Dohme Corp. | Heterocyclic compounds and methods of use thereof |
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| JP2011098969A (en) | 2011-05-19 |
| JP4815083B2 (en) | 2011-11-16 |
| WO2001016121A1 (en) | 2001-03-08 |
| AU6948200A (en) | 2001-03-26 |
| AU780009B2 (en) | 2005-02-24 |
| CA2383524A1 (en) | 2001-03-08 |
| EP1214303A1 (en) | 2002-06-19 |
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