NZ709870B2 - Spiro-lactam nmda receptor modulators and uses thereof - Google Patents

Abstract

Disclosed are compounds, represented by formula I, having enhanced potency in the modulation of NMDA receptor activity. Such compounds are contemplated for use in the treatment of conditions such as depression and related disorders. Orally available formulations and other pharmaceutically acceptable delivery forms of the compounds, including intravenous formulations, are also disclosed. le delivery forms of the compounds, including intravenous formulations, are also disclosed.

Description

SPIRO-LACTAM NMDA RECEPTOR MODULATORS AND USES THEREOF CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of United States Provisional Application No. 61/757,903, filed on January 29, 2013, which is incorporated by reference in its entirety.

BACKGROUND An N-methyl-d-aspartate (NMDA) receptor is a postsynaptic, ionotropic receptor that is responsive to, inter alia, the excitatory amino acids glutamate and glycine and the tic compound NMDA. The NMDA receptor controls the flow of both divalent and monovalent ions into the postsynaptic neural cell through a or associated channel (Foster et al, Nature 1987, 329:395-396; Mayer et al., Trends in Pharmacol. Sci. 1990, -260).

The NMDA receptor has been implicated during development in specifying neuronal architecture and synaptic connectivity, and may be involved in experience-dependent synaptic modifications. In addition, NMDA ors are also thought to be involved in long term potentiation and central nervous system disorders.

The NMDA receptor plays a major role in the ic plasticity that underlies many higher cognitive functions, such as memory acquisition, ion and learning, as well as in certain cognitive pathways and in the perception of pain (Collingridge et al., The NMDA Receptor, Oxford University Press, 1994). In addition, certain properties ofNMDA ors suggest that they may be involved in the information-processing in the brain that underlies consciousness itself The NMDA receptor has drawn particular st since it s to be involved in a broad spectrum of CNS disorders. For instance, during brain ischemia caused by stroke or traumatic injury, excessive amounts of the excitatory amino acid ate are released from damaged or oxygen deprived neurons. This excess glutamate binds to the NMDA receptors which opens their ligand-gated ion ls; in turn the m influx produces a high level of intracellular calcium which activates a biochemical cascade resulting in protein degradation and cell death. This phenomenon, known as excitotoxicity, is also thought to be responsible for the neurological damage ated with other disorders ranging from ycemia and cardiac arrest to epilepsy. In addition, there are preliminary reports indicating similar involvement in the chronic neurodegeneration of Huntington's, Parkinson's, and Alzheimer's diseases. Activation of the NMDA receptor has been shown to be responsible for post-stroke convulsions, and, in certain models of epilepsy, activation of the NMDA receptor has been shown to be necessary for the generation of seizures. Neuropsychiatric involvement of the NMDA receptor has also been recognized since blockage of the NMDA receptor Ca++ channel by the animal anesthetic PCP (phencyclidine) produces a tic state in humans similar to schizophrenia (reviewed in Johnson, K. and Jones, S., 1990). r, NMDA receptors have also been ated in certain types of spatial learning.

The NMDA receptor is believed to consist of several protein chains embedded in the postsynaptic membrane. The first two types of subunits discovered so far form a large extracellular region, which probably contains most of the eric binding sites, several transmembrane regions looped and folded so as to form a pore or channel, which is permeable to Ca++, and a carboxyl terminal region. The opening and closing of the l is regulated by the binding of various ligands to domains (allosteric sites) of the protein residing on the extracellular surface. The binding of the ligands is thought to affect a conformational change in the overall structure of the protein which is ultimately reflected in the channel opening, partially opening, partially closing, or closing.

[0006] NMDA receptor compounds may exert dual (agonist/antagonist) effect on the NMDA receptor through the eric sites. These compounds are typically termed “partial agonists”.

In the presence of the principal site , a partial t will displace some of the ligand and thus decrease Ca++ flow through the receptor. In the absence of or d level of the principal site ligand, the partial agonist acts to increase Ca++ flow through the receptor channel.

[0007] A need continues to exist in the art for novel and more specific/potent compounds that are capable of g the glycine binding site of NMDA receptors, and provide pharmaceutical benefits. In addition, a need continues to exist in the medical arts for orally rable forms of such compounds.

SUMMARY [0007a] According to a first aspect, the present invention relates to a compound represented by formula I: or a ceutically acceptable salt, a stereoisomer, or an N-oxide thereof, wherein Rb is selected from the group consisting of H, halogen, hydroxyl, cyano and C1-C6 alkyl; R1 is H or C1-C6 alkyl; R2 is H or C1-C6 alkyl; R3 is selected from the group consisting of H, C1-C6 alkyl and a nitrogen protecting group; wherein the nitrogen protecting group is selected from the group consisting of 9- fluorenylmethyloxycarbonyl, utoxycarbonyl, benzyloxycarbonyl, xybenzyloxycarbonyl , acetyl, trifluoroacetyl, benzoyl, benzyl, p-methoxybenzyl, pmethoxyphenyl , 3,4-dimethoxybenzyl, triphenylmethyl, enesulfonyl, –C(O)OR31 and – C(O)R32; wherein R31 is selected from the group consisting of C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C10 cycloalkyl, -CH2-C3-C10 cycloalkyl, -CH2-phenyl, and –CH2-pyridyl, wherein any aforementioned lkyl is optionally substituted with from 1-3 ndently selected C1-C3 alkyl, and wherein the phenyl is optionally substituted with from 1-2 tuents independently selected from C1-C3 alkyl, C1-C3 haloalkyl, C1-C3 alkoxy, C1-C3 haloalkoxy, nitro, halo, SO2Me, cyano, and -OC(O)CH3; and R32 is selected from the group consisting of H, C1-C6 alkyl, C1-C6 haloalkyl, phenyl, and pyridyl, wherein the phenyl is optionally substituted with from 1-2 substituents independently selected from C1-C3 alkyl, C1-C3 haloalkyl, C1-C3 alkoxy, C1-C3 haloalkoxy, nitro, halo, SO2Me, cyano, and -OC(O)CH3; R4 and R5 are each independently selected from the group consisting of H, C1-C6 alkyl, X, and –C1-C6 ne-X, wherein X is selected from the group ting of: (i) C3-C6 cycloalkyl; (ii) aryl including from 5 to 6 ring atoms wherein 1, 2, or 3 of the ring atoms are independently selected from the group consisting of N, NH, N(C1-C3 alkyl), O, and S; (iii) heterocyclyl including from 3 to 6 ring atoms wherein 1, 2, or 3 of the ring atoms are ndently selected from the group ting of N, NH, N(C1-C3 alkyl), O, and S; and (iv) phenyl; wherein C3-C6 cycloalkyl and heterocyclyl are each unsubstituted or substituted with from 1-3 substituents independently ed from the group consisting of halogen, cyano, oxo, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and R’; and heteroaryl and phenyl are each unsubstituted or substituted with from 1-3 substituents independently selected from the group consisting of halogen, cyano, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and -N(R’)R’; or R4 and R5 together with the nitrogen to which they are attached form: heterocyclyl including from 4 to 6 ring atoms; wherein the heterocyclyl includes not more than two ring heteroatoms (including the nitrogen atom attached to R4 and R5), and the second ring heteroatom, when t, is independently selected from the group consisting of N, NH, N(C1-C3 alkyl), O, and S; and wherein the heterocyclyl is unsubstituted or substituted with from 1-3 substituents independently selected from the group consisting of halogen, cyano, oxo, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and R’; or heteroaryl including from 5 to 6 ring atoms; wherein the heteroaryl includes not more than four ring heteroatoms (including the nitrogen atom attached to R4 and R5), and each additional ring heteroatom, when present, is independently selected from the group consisting of N, NH, N(C1-C3 alkyl), O, and S; and wherein the heteroaryl is unsubstituted or substituted with from 1-3 substituents ndently selected from the group consisting of halogen, cyano, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and -N(R’)R’; R6 is selected from the group consisting of -OH, C1-C6 alkoxy, -OC(O)-C1-C6 alkyl, - OC(O)phenyl, and -N(R’)R’; R7 is H or C1-C6 alkyl; and R’ is ndently selected for each occurrence from H and C1-C6 alkyl. [0007b] ing to a second aspect, the present invention s to a ceutical composition comprising a compound of the invention, and a pharmaceutically acceptable excipient. [0007c] According to a third aspect, the present ion relates to use of a compound of the invention in the manufacture of a medicament for treating depression, Alzheimer’s disease, attention deficit disorder, schizophrenia, or y. [0007d] According to a fourth aspect, the present invention s to the compound of the invention represented by formula I: or a pharmaceutically acceptable salt, a stereoisomer, or an N-oxides thereof, wherein Rb is selected from the group consisting of H, halogen, hydroxyl, cyano and C1-C6 alkyl; R1 is H or C1-C6 alkyl; R2 is H or C1-C6 alkyl; R3 is selected from the group consisting of H, C1-C6 alkyl and a en protecting group; R4 and R5 are independently H or C1-C6 alkyl, or R4 and R5 taken together with the nitrogen to which they are attached form a 4-, 5- or 6-membered heterocyclic or 5-6 membered heteroaryl ring, tituted or substituted with 1-3 substituents selected from the group consisting of halogen, cyano, C1-C6 alkyl, -OH, C1-C6 alkoxy, and -N(R’)R’, n R’ is independently selected for each occurrence from H or C1-C6 alkyl; R6 is selected from the group consisting of -OH, C1-C6 alkoxy, -OC(O)-C1-C6 alkyl, and -OC(O)phenyl; and R7 is H or C1-C6 alkyl.

Provided , at least in part, are compounds that are NMDA modulators, for example, partial agonists of NMDA. For example, disclosed herein are compounds represented by the formula: 3c followed by page 4 and pharmaceutically acceptable salts, stereoisomers, and N-oxides thereof, wherein Rb is selected from the group consisting of H, halogen, yl, cyano and C1-C6 alkyl; R1 is H or C1-C6 alkyl; R2 is H or C1-C6 alkyl; R3 is selected from the group consisting of H, C1-C6 alkyl and a nitrogen protecting group; R4 and R5 are independently H or C1-C6 alkyl, or R4 and R5 taken together with the nitrogen to which they are attached form a 4-, 5- or ered heterocyclic or heteroaryl ring optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, oxo, C1-C6 alkyl, -OH, C1-C6 alkoxy, and -N(R’)R’, wherein R’ is independently selected for each occurrence from H or C1-C6 alkyl; R6 is selected from the group consisting of -OH, C1-C6 alkoxy, -OC(O)-C1-C6 alkyl, and -OC(O)phenyl; and R7 is H or C1-C6 alkyl; or in other embodiments, the variables set forth in formula (I) are defined as s: Rb is selected from the group consisting of H, n, hydroxyl, cyano and C1-C6 alkyl (e.g., H); R1 is H or C1-C6 alkyl; R2 is H or C1-C6 alkyl; R3 is selected from the group ting of H, C1-C6 alkyl and a nitrogen protecting group; R4 and R5 are each independently selected from the group consisting of H, C1-C6 alkyl, X, and —C1—C6 alkylene—X, wherein X is selected from the group consisting of: (i) C3—C6 cycloalkyl; (ii) heteroaryl including from 5 to 6 ring atoms wherein l, 2, or 3 of the ring atoms are independently selected from the group consisting ofN, NH, N(C1—C3 alkyl), 0, and S; (iii) heterocyclyl including from 3 to 6 ring atoms wherein l, 2, or 3 of the ring atoms are ndently selected from the group consisting of N, NH, N(Cl-C3 , 0, and S; and (iv) phenyl; wherein C3-C6 cycloalkyl and heterocyclyl are each optionally substituted with from 1-3 tuents independently selected from the group consisting of halogen, cyano, oxo, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and R’, wherein R’ is independently selected for each occurrence from H and C1—C6 alkyl; and heteroaryl and phenyl are each optionally substituted with from 1—3 substituents independently selected from the group consisting of halogen, cyano, C1-C6 alkyl, yl, C1-C6 alkoxy, and -N(R’)R’; or R4 and R5 together with the nitrogen to which they are attached form: heterocyclyl including from 4 to 6 ring atoms; wherein the heterocyclyl includes not more than two ring heteroatoms ding the nitrogen atom attached to R4 and R5), and the second ring heteroatom, when present, is independently selected from the group consisting of N, NH, N(C1—C3 alkyl), 0, and S; and wherein the heterocyclyl is optionally substituted with from 1-3 substituents independently selected from the group consisting of n, cyano, oxo, C1—C6 alkyl, hydroxyl, C1-C6 alkoxy, and - N(R’)R’; or heteroaryl including from 5 to 6 ring atoms; wherein the heteroaryl includes not more than four ring heteroatoms (including the nitrogen atom ed to R4 and R5), and each additional ring atom, when present, is independently ed from the group consisting ofN, NH, N(C1-C3 alkyl), 0, and S; and wherein the heteroaryl is optionally substituted with from 1-3 substituents independently WO 20783 ed from the group consisting of n, cyano, C1—C6 alkyl, hydroxyl, C1—C6 alkoxy, and -N(R’)R’; R6 is selected from the group consisting of —OH, C1—C6 alkoxy, -OC(O)—C1—C6 alkyl, — OC(O)phenyl, and -N(R’)R’; and R7 is H or C1-C6 alkyl.

Also provided herein are pharmaceutically acceptable compositions comprising a disclosed compound, and a pharmaceutically acceptable excipient. For example, such itions may be suitable for oral or intravenous administration to a patient.

In another aspect, a method of treating a condition selected from the group consisting of autism, anxiety, depression, bipolar disorder, attention deficit er, attention deficit ctivity disorder (ADHD), schizophrenia, a psychotic disorder, a psychotic symptom, social withdrawal, obsessive—compulsive disorder, phobia, post—traumatic stress syndrome, a behavior er, an e control disorder, a substance abuse disorder, a sleep er, a memory disorder, a learning disorder, urinary incontinence, multiple system atrophy, progressive supra-nuclear palsy, Friedrich's ataxia, Down’s syndrome, fragile X syndrome, tuberous sclerosis, olivio-ponto—cerebellar atrophy, cerebral palsy, drug—induced optic neuritis, ischemic retinopathy, diabetic pathy, glaucoma, dementia, AIDS dementia, Alzheimer’s disease, Huntington’s chorea, spasticity, myoclonus, muscle spasm, te's syndrome, epilepsy, cerebral ischemia, stroke, a brain tumor, traumatic brain injury, cardiac arrest, myelopathy, spinal cord injury, peripheral neuropathy, acute neuropathic pain, and chronic neuropathic, in a patient in need f is provided. Such methods may comprise administering to the patient a pharmaceutically effective amount of a sed compound or pharmaceutically acceptable salts, stereoisomers, N—oxides, and hydrates thereof.

In some embodiments, a contemplated method includes treating depression. For example, sion may include one or more of major depressive disorder, dysthymic disorder, psychotic depression, postpartum depression, al affective disorder, bipolar disorder, mood disorder, or depression caused by a chronic l condition. In other ments, a contemplated method may treat schizophrenia. Such schizophrenia may be, for example, paranoid type schizophrenia, disorganized type schizophrenia, catatonic type schizophrenia, undifferentiated type schizophrenia, residual type schizophrenia, postschizophrenic depression, or simple schizophrenia.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows the potentiation of [3H]MK-8Ol binding in the presence of Compound X.

Figure 2 shows results of long term potentiation in ampal slices using Compound X.

DETAILED DESCRIPTION

[0014] This disclosure is generally directed to compounds that are capable of modulating NMDA, e.g., NMDA nists or partial agonists, and itions and/or s of using the disclosed compounds.

Definitions ing” includes any effect, e. g., lessening, reducing, modulating, or ating, that results in the improvement of the condition, disease, disorder and the like.

The term “alkenyl” as used herein refers to an unsaturated straight or branched hydrocarbon having at least one carbon-carbon double bond, such as a straight or branched group of 2-6 or 3—4 carbon atoms, referred to herein for example as C2_C6 alkenyl, and C3_C4 alkenyl, respectively. Exemplary alkenyl groups include, but are not limited to, vinyl, allyl, butenyl, pentenyl, etc.

The term “alkoxy” as used herein refers to a straight or branched alkyl group attached to an oxygen (alkyl—O—). ary alkoxy groups include, but are not d to, alkoxys of 1-6 or 2-6 carbon atoms, referred to herein as C1-C6 alkoxy, and C2-C6 alkoxy, respectively. Exemplary alkoxy groups include, but are not limited to methoxy, ethoxy, isopropoxy, etc.

The term “alkenyloxy” used herein refers to a straight or branched alkenyl group attached to an oxygen (alkenyl-O). Exemplary alkenoxy groupd include, but are not d to, groups with an alkenyl group of 3-6 carbon atoms, (also e. g. referred to as C3—C5 alkenyloxy).

Exemplary “alkenoxy” groups include, but are not d to allyloxy, butenyloxy, etc.

[0019] The term “alkynyloxy” used herein refers to a ht or branched alkynyl group attached to an oxygen (alkynyl-0)). Exemplary alkynyloxy groups include, but are not limited to, C3-C6 alkynyloxy, e. g., propynyloxy.

The term “alkyl” as used herein refers to a saturated straight or branched hydrocarbon, such as a straight or ed group of 1—6, 1-4, or 1-3 carbon atoms, referred to herein as C1-C6 alkyl, C1-C4 alkyl, and C1-C3 alkyl, respectively. Exemplary alkyl groups e, but are not limited to, methyl, ethyl, propyl, isopropyl, 2-methyl-l-propyl, 2-methyl propyl, yl-l-butyl, 3-methyl-l—butyl, 3—methyl-2—butyl, 2,2-dimethyl-l-propyl, 2- methyl-l-pentyl, 3—methyl-l—pentyl, 4-methyl—l-pentyl, 2-methylpentyl, 3-methylpentyl, yl-2—pentyl, 2,2-dimethyl-l-butyl, 3,3-dimethyl—l-butyl, 2-ethyl-l—butyl, butyl, isobutyl, t-butyl, pentyl, isopentyl, neopentyl, hexyl, etc. The term “haloalkyl” as used herein refers to a saturated ht or branched alkyl groups, in which one or more hydrogen atoms of the alkyl group are replaced with one or more independently selected halogens. The term “haloalkyl” asses alkyl groups in which all of hydrogen atoms of the alkyl group are replaced independently selected halogens (sometimes referred to as “perhalo” alkyl groups. ary haloalkyl groups e, but are not limited to, CHZF, CHZCHzCl, CF3, CHFCHzCl.

The term “alkynyl” as used herein refers to an unsaturated straight or branched hydrocarbon having at least one carbon-carbon triple bond, such as a straight or branched group of 2-6, or 3-6 carbon atoms, referred to herein as C2-C6 l, and C3_C6 alkynyl, respectively.

Exemplary alkynyl groups include, but are not limited to, ethynyl, propynyl, butynyl, pentynyl, hexynyl, methylpropynyl, etc.

The term “bridged cycloalkyl”, as used herein, is defined as a monocyclic 4— to 7— membered cycloalkyl group in which two non—adj acent atoms are linked by a CH2 or CHZCHZ group. A ed cycloalkyl” may be fused to one or more phenyl, partially unsaturated, or saturated rings. Examples of bridged carbocyclic groups include but are not limited to bicyclo[2.2.l]heptane etc. , bicyclo[2.2.2]octane, , bicyclo[2.2.2]octene The term “carbonyl” as used herein refers to the radical -C(O)—. The term “cyano” as used herein refers to the radical -CN. The term “nitro” refers to the l —N02. The term “H” refers to hydrogen.

The term “cycloalkoxy” as used herein refers to a cycloalkyl group attached to an oxygen (cycloalkyl—O).

The term “cycloalkyl” as used herein refers to a monocyclic saturated or partically unsatured hydrocarbon group of for example 3-6, or 4—6 s, referred to herein, e. g., as "C3. 6 cycloalkyl" or “CM cycloalkyl," and derived from a lkane. Exemplary cycloalkyl groups include, but are not limited to, cyclohexane, cyclohexene, cyclopentane, cyclobutane, cyclopropane or cyclopentane.

The terms “halo” or “halogen” as used herein refer to F, Cl, Br, or I.

The terms “heteroaryl” as used herein refers to a monocyclic aromatic 4-6 membered ring system containing one or more heteroatoms, for example one to three heteroatoms, such as nitrogen, oxygen, and sulfur. Where possible, said heteroaryl ring may be linked to the adjacent radical though carbon or nitrogen. Examples of heteroaryl rings include but are not limited to furan, thiophene, e, thiazole, oxazole, isothiazole, isoxazole, imidazole, pyrazole, triazole, pyridine, and pyrimidine.

[0028] The terms “heterocyclyl” or “heterocyclic group” are cognized and refer to saturated or partially unsaturated 4— to ered ring structures, whose ring ures include one to three heteroatoms, such as en, oxygen, and sulfur. A heterocycle may be fused to one or more phenyl, partially unsaturated, or saturated rings. Examples of heterocyclyl groups include but are not limited to idine, piperidine, morpholine, thiomorpholine, and piperazine.

The term “heterocyclylalkoxy” as used herein refers to a heterocyclyl— alkyl-O— group.

The term “heterocyclyloxyalkyl” refers to a heterocyclyl-O—alkyl- group.

The term “heterocycloxy” refers to a heterocyclyl—O— group. The term “cycloalkyloxy” refers to a lkyl-O— group.

The term oaryloxy” referes to a heteroaryl—O— group.

The terms “hydroxy” and “hydroxyl” as used herein refers to the radical -OH.

The term “oxo” as used herein refers to the radical =0.

The term “nitrogen ting group” or “amino protecting group” is art- ized and as used herein refers to a chemical moiety that is covalently linked to a nitrogen atom of an amino (primary or secondary) group and that temporarily blocks the reactivity of the amino group during a synthetic step and is selectively removed once the synthetic step is complete. Nitrogen protecting groups include, for e, 9-Fluorenylmethyloxycarbonyl (Fmoc), tert—butoxycarbonyl (Boc), carbobenzyloxycarbonyl (Cbz), p— methoxybenzyloxycarbonyl, acetyl, trifluoroacetyl, benzoyl, phthalimido, benzyl (Bn), p- ybenzyl, p-methoxyphenyl, 3,4-dimethoxybenzyl, triphenylmethyl, benzylidene, and ptoluenesulfonyl (Ts). In some embodiments, the nitrogen protecting group can have one of the following formulas: —C(O)OR31 or —C(O)R32 as defined herein.

As used in the present disclosure, the term “partial NMDA receptor t” generally refers to a compound that is capable of binding to a glycine binding site of an NMDA receptor; at low trations a NMDA receptor agonist acts substantially as agonist and at high concentrations it acts substantially as an antagonist. These concentrations are experimentally determined for each and every “partial agonist.

“Pharmaceutically or pharmacologically acceptable” include molecular entities and compositions that do not produce an adverse, ic or other untoward reaction when administered to an animal, or a human, as appropriate. For human administration, preparations should meet sterility, pyrogenicity, l safety and purity standards as required by FDA Office of Biologics standards.

The term “pharmaceutically acceptable carrier” or “pharmaceutically acceptable ent” as used herein refers to any and all solvents, dispersion media, coatings, isotonic and absorption ng agents, and the like, that are compatible with pharmaceutical stration. The use of such media and agents for pharmaceutically active substances is well known in the art. The compositions may also contain other active compounds providing mental, additional, or enhanced therapeutic functions.

[0039] The term “pharmaceutical composition” as used herein refers to a composition comprising at least one compound as disclosed herein formulated together with one or more ceutically acceptable carriers.

“Individual,” nt,” or “subject” are used interchangeably and include any animal, including mammals, ably mice, rats, other rodents, rabbits, dogs, cats, swine, , sheep, horses, or primates, and most preferably humans. The compounds of the ion can be administered to a mammal, such as a human, but can also be administered to other mammals such as an animal in need of veterinary treatment, e. g., domestic animals (e.g., dogs, cats, and the like), farm animals (e.g., cows, sheep, pigs, horses, and the like) and laboratory animals (e.g., rats, mice, guinea pigs, and the like). The mammal treated in the methods of the invention is desirably a mammal in which treatment e.g., of pain or depression is desired. “Modulation” includes antagonism (e. g., inhibition), agonism, partial nism and/or partial agonism. -10_ In the present cation, the term “therapeutically effective amount” means the amount of the subject compound that will elicit the biological or medical response of a , system, animal or human that is being sought by the cher, veterinarian, medical doctor or other clinician. The compounds of the invention are administered in therapeutically effective amounts to treat a disease. Alternatively, a therapeutically effective amount of a nd is the quantity required to achieve a desired therapeutic and/or prophylactic effect, such as an amount which results in lessening a symptom of depression.

The term "pharmaceutically acceptable salt(s)" as used herein refers to salts of acidic or basic groups that may be t in nds used in the present compositions.

Compounds included in the present compositions that are basic in nature are capable of forming a wide variety of salts with various inorganic and organic acids. The acids that may be used to prepare pharmaceutically acceptable acid addition salts of such basic compounds are those that form non-toxic acid addition salts, i.e., salts containing pharmacologically acceptable anions, including but not limited to malate, oxalate, chloride, bromide, iodide, nitrate, sulfate, bisulfate, phosphate, acid ate, isonicotinate, acetate, lactate, salicylate, citrate, tartrate, oleate, tannate, pantothenate, bitartrate, ascorbate, succinate, maleate, gentisinate, fumarate, gluconate, glucaronate, saccharate, formate, benzoate, glutamate, methanesulfonate, ethanesulfonate, benzenesulfonate, p-toluenesulfonate and pamoate (i.e., ethylene-bis-(2—hydroxy naphthoate)) salts. Compounds included in the present compositions that are acidic in nature are capable of forming base salts with various cologically acceptable cations. Examples of such salts include alkali metal or alkaline earth metal salts and, particularly, m, magnesium, sodium, m, zinc, potassium, and iron salts. nds included in the present compositions that include a basic or acidic moiety may also form pharmaceutically acceptable salts with various amino acids. The compounds of the disclosure may contain both acidic and basic groups; for example, one amino and one carboxylic acid group. In such a case, the compound can exist as an acid addition salt, a zwitterion, or a base salt.

The compounds of the disclosure may contain one or more chiral centers and/or double bonds and, therefore, exist as stereoisomers, such as geometric isomers, enantiomers or diastereomers. The term “stereoisomers” when used herein consist of all geometric s, omers or diastereomers. These compounds may be designated by the symbols “R” or “S,” depending on the configuration of substituents around the stereogenic carbon atom. The present invention encompasses s stereoisomers of these nds and mixtures thereof.

Stereoisomers include enantiomers and diastereomers. Mixtures of enantiomers or -11_ reomers may be designated “(i)” in nomenclature, but the skilled artisan will recognize that a structure may denote a chiral center implicitly.

The compounds of the disclosure may contain one or more chiral centers and/or double bonds and, therefore, exist as geometric isomers, enantiomers or diastereomers. The enantiomer and diastereomers may be designated by the s “(+),” “(—).” “R” or “S,” depending on the configuration of tuents around the stereogenic carbon atom, but the skilled artisan will recognize that a structure may denote a chiral center implicitly. Geometric isomers, resulting from the arrangement of substituents around a carbon—carbon double bond or arrangement of substituents around a cycloalkyl or heterocyclic ring, can also exist in the compounds of the present invention. The symbol denotes a bond that may be a single, double or triple bond as described herein. Substituents around a carbon-carbon double bond are designated as being in the “Z” or “E” configuration wherein the terms “Z” and “E” are used in accordance with IUPAC standards. Unless otherwise specified, structures depicting double bonds encompass both the “E” and “Z” isomers. tuents around a carbon—carbon double bond alternatively can be referred to as “cis” or “trans,” where “cis” represents substituents on the same side of the double bond and “trans” represents substituents on te sides of the double bond. The arrangement of tuents around a yclic ring can also be designated as “cis” or “trans.” The term “cis” represents substituents on the same side of the plane of the ring and the term “trans” represents substituents on opposite sides of the plane of the ring.

Mixtures of compounds wherein the tuents are disposed on both the same and opposite sides of plane of the ring are designated rans.” The term oisomers” when used herein consist of all geometric isomers, enantiomers or diastereomers. The present invention encompasses various stereoisomers of these compounds and mixtures thereof.

[0046] Individual enantiomers and diasteriomers of compounds of the present invention can be prepared synthetically from commercially available starting materials that contain asymmetric or stereogenic centers, or by preparation of racemic mixtures ed by resolution methods well known to those of ordinary skill in the art. These methods of resolution are exemplified by (l) attachment of a mixture of enantiomers to a chiral auxiliary, separation of the resulting mixture of diastereomers by recrystallization or chromatography and liberation of the optically pure product from the auxiliary, (2) salt formation employing an optically active resolving agent, (3) direct separation of the mixture of optical enantiomers on -12_ chiral liquid chromatographic columns or (4) kinetic resolution using steroselective chemical or enzymatic reagents. Racemic mixtures can also be resolved into their component enantiomers by well—known s, such as chiral-phase gas tography or crystallizing the compound in a chiral solvent. Stereoselective syntheses, a chemical or enzymatic reaction in which a single reactant forms an unequal mixture of stereoisomers during the creation of a new stereocenter or during the transformation of a pre-existing one, are well known in the art.

Stereoselective syntheses encompass both enantio— and reoselective transformations. For es, see Carreira and Kvaemo, Classics in Stereoselective Synthesis, Wiley—VCH: Weinheim, 2009.

[0047] The compounds disclosed herein can exist in solvated as well as unsolvated forms with pharmaceutically acceptable solvents such as water, ethanol, and the like, and it is intended that the invention embrace both solvated and unsolvated forms. In one embodiment, the nd is amorphous. In one ment, the compound is a single rph. In another embodiment, the compound is a e of polymorphs. In another embodiment, the compound is in a crystalline form.

The invention also embraces ically labeled compounds of the invention which are identical to those recited herein, except that one or more atoms are replaced by an atom having an atomic mass or mass number different from the atomic mass or mass number usually found in nature. es of isotopes that can be orated into compounds of the invention include isotopes of hydrogen, carbon, nitrogen, , phosphorus, fluorine and chlorine, such as 2H, 3H, 13 C, 14C, ”N, 18O, 17O, 31F, 32F, 358, 18F, and 36Cl, respectively. For example, a compound of the invention may have one or more H atom replaced with deuterium.

Certain isotopically—labeled disclosed compounds (e.g., those labeled with 3H and 14C) are useful in compound and/or substrate tissue distribution assays. Tritiated (i.e., 3H) and carbon—l4 (i.e., 14C) isotopes are particularly preferred for their ease of preparation and detectability. Further, substitution with heavier isotopes such as deuterium (i.e., 2H) may afford certain therapeutic advantages resulting from greater lic stability (e.g., increased in viva half—life or reduced dosage requirements) and hence may be preferred in some circumstances.

Isotopically labeled compounds of the invention can generally be prepared by following ures analogous to those disclosed in the e.g., Examples herein by substituting an ically labeled reagent for a non—isotopically labeled reagent. -13_ The term ug” refers to compounds that are transformed in vivo to yield a disclosed compound or a pharmaceutically acceptable salt, hydrate or solvate of the compound.

The transformation may occur by various mechanisms (such as by esterase, e, phosphatase, oxidative and or reductive metabolism) in various locations (such as in the intestinal lumen or upon t of the intestine, blood or liver). Prodrugs are well known in the art (for example, see Rautio, Kumpulainen, et al, Nature Reviews Drug Discovery 2008, 7, 255). For example, if a compound of the invention or a pharmaceutically acceptable salt, hydrate or solvate of the nd contains a carboxylic acid functional group, a prodrug can comprise an ester formed by the replacement of the hydrogen atom of the acid group with a group such as (C1—C8)alkyl, (C2-C12)alkanoyloxymethy1, l-(alkanoyloxy)ethyl having from 4 to 9 carbon atoms, l-methyl-l-(alkanoyloxy)-ethyl having from 5 to 10 carbon atoms, alkoxycarbonyloxymethyl having from 3 to 6 carbon atoms, l-(alkoxycarbonyloxy)ethyl having from 4 to 7 carbon atoms, l-methyl-l-(alkoxycarbonyloxy)ethyl having from 5 to 8 carbon atoms, N—(alkoxycarbonyl)aminomethyl having from 3 to 9 carbon atoms, alkoxycarbonyl)amino)ethyl having from 4 to 10 carbon atoms, 3—phthalidyl, 4-crotonolactonyl, gamma-butyrolactonyl, di-N,N—(C1-C2)alkylamino(C2-C3)alkyl (such as B-dimethylaminoethyl), carbamoyl-(Cl—C2)alkyl, N,N-di(C1-C2)alkylcarbamoyl-(C1-C2)alkyl and piperidino-, pyrrolidino— or morpholino(C2-C3)alkyl.

Similarly, if a nd of the invention contains an l functional group, a prodrug can be formed by the replacement of the hydrogen atom of the alcohol group with a group such as (C1—C6)a1kanoyloxymethyl, 1—((C1-C6)a]kanoyloxy)ethyl, l-methyl- l—((C1-C6)alkanoyloxy)ethyl (C1-C6)alkoxycarbonyloxymethyl, N—(C1—C6)alkoxycarbonylaminomethyl, succinoyl, (C1—C6)alkanoyl, d—amino(C1—C4)alkanoyl, arylacyl and (x-aminoacyl, or (x-aminoacyl-(x-aminoacyl, where each oc-aminoacyl group is independently selected from the naturally occurring L—amino acids, P(O)(OH)2, -P(O)(O(C1-C6)alkyl)2 or glycosyl (the radical resulting from the removal of a yl group of the hemiacetal form of a ydrate).

If a compound of the invention incorporates an amine functional group, a prodrug can be formed, for example, by creation of an amide or carbamate, an N—acyloxyakyl derivative, an (oxodioxolenyl)methyl tive, an N-Mannich base, imine or enamine. In addition, a ary amine can be lically cleaved to generate a bioactive primary amine, or a tertiary amine can metabolically d to generate a bioactive primary or 2014/013619 -14_ secondary amine. For examples, see Simplicio, et al., Molecules 2008, I3, 519 and references therein.

Compounds Disclosed compounds include those represented by the a: and pharmaceutically acceptable salts, stereoisomers, and N—oxides f, wherein Rb is selected from the group consisting of H, halogen, hydroxyl, cyano and C1-C6 alkyl; R1 is H or C1—C6 alkyl; R2 is H or C1-C6 alkyl; R3 is selected from the group consisting of H, C1-C6 alkyl and a nitrogen protecting group; R4 and R5 are independently H or C1-C6 alkyl, or R4 and R5 taken together with the nitrogen to which they are attached form a 4-, 5— or 6-membered heterocyclic or heteroaryl ring optionally substituted with one or more substituents selected from the group consisting of halogen, cyano, oxo, C1-C6 alkyl, -OH, C1-C6 alkoxy, and -N(R’)R’, wherein R’ is independently selected for each ence from H or C1—C6 alkyl; R6 is selected from the group ting of -OH, C1-C6 alkoxy, -C1-C6 alkyl, and —OC(O)phenyl; and R7 is H or C1-C6 alkyl; or in other embodiments, the variables set forth in formula (I) are defined as follows: Rb is selected from the group consisting of H, halogen, hydroxyl, cyano and C1-C6 alkyl (6%., H); R1 is H or C1—C6 alkyl; R2 is H or C1-C6 alkyl; -15_ R3 is selected from the group consisting of H, C1-C6 alkyl and a en protecting group; R4 and R5 are each independently selected from the group consisting of H, C1-C6 alkyl, X, and —C1—C6 alkylene—X, wherein X is selected from the group consisting of: (i) C3—C6 cycloalkyl; (ii) heteroaryl including from 5 to 6 ring atoms wherein l, 2, or 3 of the ring atoms are independently selected from the group consisting ofN, NH, N(C1—C3 alkyl), 0, and S; (iii) heterocyclyl including from 3 to 6 ring atoms wherein l, 2, or 3 of the ring atoms are ndently selected from the group consisting of N, NH, N(Cl-C3 alkyl), 0, and S; and (iv) phenyl; wherein C3-C6 cycloalkyl and heterocyclyl are each optionally substituted with from 1-3 substituents independently selected from the group consisting of halogen, cyano, oxo, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and R’, n R’ is independently selected for each occurrence from H and C1—C6 alkyl; and heteroaryl and phenyl are each optionally substituted with from 1—3 substituents independently selected from the group consisting of halogen, cyano, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and -N(R’)R’; or R4 and R5 together with the nitrogen to which they are attached form: heterocyclyl including from 4 to 6 ring atoms; wherein the heterocyclyl includes not more than two ring heteroatoms (including the nitrogen atom attached to R4 and R5), and the second ring heteroatom, when t, is ndently selected from the group consisting of N, NH, N(C1—C3 alkyl), 0, and S; and wherein the heterocyclyl is ally tuted with from 1-3 substituents independently selected from the group consisting of halogen, cyano, oxo, C1—C6 alkyl, hydroxyl, C1-C6 alkoxy, and - N(R’)R’; or heteroaryl including from 5 to 6 ring atoms; wherein the heteroaryl includes not more than four ring heteroatoms (including the nitrogen atom ed to R4 and R5), and each additional ring heteroatom, when present, is independently selected from the group consisting ofN, NH, N(C1-C3 , 0, and S; and wherein the heteroaryl is optionally substituted with from 1-3 substituents independently -l6— selected from the group consisting of n, cyano, C1—C6 alkyl, hydroxyl, C1—C6 alkoxy, and -N(R’)R’; R6 is selected from the group consisting of —OH, C1—C6 alkoxy, —C1—C6 alkyl, — OC(O)phenyl, and -N(R’)R’; and R7 is H or C1-C6 alkyl.

In some embodiments is H. In other embodiments, R1 is C1—C6 alkyl, e. g., CH3.

, R1 In some embodiments, R2 is H. In other embodiments, R2 is C1—C6 alkyl, e. g., CH3.

In some embodiments, R3 is H.

In some embodiments, R3 is a nitrogen protecting group. In some embodiments, R3 has formula —C(O)OR31, wherein R31 is selected from the group consisting of: C1—C6 alkyl; C1— C6 haloalkyl, C2-C6 alkenyl; C2-C6 l; C3-C10 cycloalkyl, wherein the C3-C10 cycloalkyl is optionally tuted with from 1—3 ndently selected C1—C3 alkyl; —CH2—C3—C10 cycloalkyl wherein the C3-C10 cycloalkyl is ally substituted with from 1-3 independently selected C1—C3 alkyl; —CH2—phenyl, wherein the phenyl is optionally substituted with from 1-2 substituents independently selected from C1—C3 alkyl, C1-C3 haloalkyl, C1-C3 , C1—C3 haloalkoxy, nitro, halo, SO2Me, cyano, and -OC(O)CH3; and -CH2-pyridyl. In certain embodiments, R31 is C1—C6 alkyl (e. g., tert—butyl). In other embodiments, R3 has formula — C(O)R32, wherein R32 is selected from the group ting of: H; C1—C6 alkyl; C1—C6 haloalkyl; phenyl, wherein the phenyl is optionally substituted with from 1-2 tuents independently selected from C1-C3 alkyl; C1-C3 haloalkyl, C1-C3 alkoxy; C1-C3 haloalkoxy; nitro; halo; SO2Me, cyano; and -OC(O)CH3; and pyridyl. In certain embodiments, R32 is C1—C6 alkyl (e.g., —CH3 or iso—propyl).

In some embodiments, R4 and R5 are each independently selected from the group consisting of H, C1-C6 alkyl, X, and —C1—C5 alkylene-X. In certain embodiments, R4 and R5 are each ndently selected from the group consisting of H and C1—C6 alkyl. In other embodiments, R4 and R5 are each independently selected from the group consisting of H and — C1-C6 alkylene-X. In certain embodiments, R4 and R5 are H. In other embodiments, one of R4 and R5 is H, and the other is —C1-C6 alkylene-X. In certain of these embodiments, the compounds can e one or both (e. g., both) of the following features: (i) —C1-C6 alkylene— X is ; and (ii) X is phenyl or heteroaryl including from 5 to 6 ring atoms wherein 1, 2, or 3 of the ring atoms are independently selected from the group consisting of N, NH, N(Cl—C3 alkyl), 0, and S; each optionally substituted with from 1—3 substituents independently selected -17_ from the group consisting of halogen, cyano, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and - In other embodiments, R4 and R5 taken together form a heterocyclic or heteroaryl ring as defined previously and anywhere herein. In certain embodiments, R4 and R5 taken together form a heterocyclic ring, e.g., a ring selected from the group consisting of azetidinyl, pyrrolidinyl, lidinyl, isooxazolidinyl, imidazolidinyl, oxazolidinyl, thiazolidinyl, and isothiazolidinyl. In a particular embodiment, R4 and R5 taken together form a pyrrolidinyl ring.

In certain ments, R4 and R5 taken together form a heteroaryl ring, e.g., a ring selected from the group consisting of imidazolyl, pyrazolyl, yl, isoxazolyl, thiazolyl, pyridinyl, diazinyl, oxazinyl, and thiazinyl.

In some embodiments, R1 is H; R2 is H; R3 is H; and R4 and R5 taken together form a pyrrolidine ring. In some embodiments, R1 is H; R2 is H; R3 is H; and R4 and R5 are H. In some embodiments, R1 is H or CH3; R2 is H or CH3; R3 is H; and R4 and R5 taken together form a pyrrolidinyl ring. In some embodiments, R1 is H or CH3; R2 is H or CH3; R3 is H; and R4 and R5 are H. In some embodiments, R1 is H or CH3; R2 is H or CH3; R3 is H; and one ofR4 and R5 is H, and the other is , wherein X is phenyl or heteroaryl ing from 5 to 6 ring atoms wherein 1, 2, or 3 of the ring atoms are independently selected from the group consisting ofN, NH, N(Cl—C3 alkyl), 0, and S; each optionally substituted with from 1-3 substituents independently selected from the group consisting of halogen, cyano, C1-C6 alkyl, hydroxyl, C1- C6 alkoxy, and -N(R’)R’. In some embodiments, R1 is H or CH3; R2 is H or CH3; R3 is en protecting group (e. g., —C(O)OR31 or —C(O)R32); and R4 and R5 taken together form a pyrrolidinyl ring. In some embodiments, R1 is H or CH3; R2 is H or CH3; R3 is nitrogen ting group (e.g., R31 or —C(O)R32); and R4 and R5 are H. In some ments, R1 is H or CH3; R2 is H or CH3; R3 is nitrogen protecting group (e.g., —C(O)OR31 or —C(O)R32); and one of R4 and R5 is H, and the other is —CH2—X, wherein X is phenyl or heteroaryl including from 5 to 6 ring atoms wherein l, 2, or 3 of the ring atoms are independently selected from the group consisting ofN, NH, N(Cl-C3 , 0, and S; each optionally substituted with from 1—3 substituents independently ed from the group consisting of halogen, cyano, C1- C6 alkyl, hydroxyl, C1-C5 , and -N(R’)R’.

[0061] In some embodiments (including any of the foregoing embodiments described above), R6 is selected from the group consisting of -OH, C1-C6 alkoxy, -OC(O)—C1-C6 alkyl, and -OC(O)phenyl. In certain embodiments (including any of the foregoing embodiments described above), R6 is —OH. In other embodiments (including any of the foregoing .18_ embodiments described above), R6 is —NH2. In some embodiments (including any of the foregoing embodiments described above), R7 is C1—C6 alkyl, e.g., CH3. In some embodiments (including any of the ing embodiments described , R6 is —OH or —NH2, and R7 is C1-C6 alkyl, e. g., CH3. In some embodiments (including any of the foregoing embodiments described above), Rb is H.

In some embodiments, the compound is ed from the compounds delineated in Table 1 and/or the Examples. In certain embodiments, a disclosed compound includes one having the formula: 0 O wt... QM... 9N9H NH2 NH2 0 o 0 0 OH 7 .

[0063] The compounds of the t sure and formulations thereof may have a plurality of chiral centers. Each chiral center may be ndently R, S, or any mixture of R and S. For example, in some embodiments, a chiral center may have an R:S ratio of n about 100:0 and about 50:50, between about 100:0 and about 75:25, n about 100:0 and about 85: 15, between about 100:0 and about 90:10, between about 100:0 and about 95:5, between about 100:0 and about 98:2, between about 100:0 and about 99:1, between about 0: 100 and 50:50, between about 0: 100 and about 25:75, between about 0: 100 and about 15:85, between about 0: 100 and about 10:90, between about 0:100 and about 5:95, n about 0: 100 and about 2:98, between about 0: 100 and about 1299, between about 75:25 and 25:75, and about 50:50. Formulations of the disclosed compounds sing a greater ratio of one or more isomers (i.e., R and/or S) may possess enhanced therapeutic characteristic relative to racemic formulations of a disclosed nds or mixture of compounds. In some instances, chemical formulas contain the descriptor “-(R)-“ or “-(S)-“ that is further attached to solid wedge or dashed wedge. This descriptor is intended to show a methine carbon (CH) that is attached to three other substituents and has either the indicated R or S configuration (see, e. g., Table 1).

Disclosed compounds may provide for efficient cation channel opening at the NMDA receptor, e.g. may bind or associate with the glutamate site of the NMDA receptor to assist in opening the cation channel. The disclosed compounds may be used to regulate (turn on or turn off) the NMDA receptor through action as an agonist. -19_ The compounds as described herein may be glycine site NMDA receptor partial agonists. A partial t as used in this context will be understood to mean that at a low concentration, the analog acts as an t and at a high concentration, the analog acts as an antagonist. Glycine binding is not inhibited by glutamate or by competitive inhibitors of glutamate, and also does not bind at the same site as glutamate on the NMDA receptor. A second and separate binding site for glycine exists at the NMDA receptor. The ligand-gated ion channel of the NMDA or is, thus, under the control of at least these two distinct allosteric sites. Disclosed nds may be e of binding or associating with the glycine g site of the NMDA receptor. In some ments, disclosed compounds may s a potency that is 10—fold or greater than the activity of existing NMDA receptor glycine site partial agonists.

The disclosed compounds may exhibit a high therapeutic index. The therapeutic index, as used herein, refers to the ratio of the dose that produces a toxicity in 50% of the population (i.e., TD50) to the minimum effective dose for 50% of the population (i.e., EDso).

Thus, the therapeutic index = (TDSO):(ED50). In some embodiments, a disclosed compound may have a therapeutic index of at least about 10:1, at least about 50:1, at least about 100: 1, at least about 200:1, at least about 500:1, or at least about 100021.

Compositions In other aspects, ations and compositions comprising the disclosed compounds and optionally a pharmaceutically acceptable excipient are provided. In some embodiments, a contemplated formulation comprises a racemic mixture of one or more of the disclosed compounds.

Contemplated formulations may be prepared in any of a variety of forms for use.

By way of example, and not limitation, the compounds may be prepared in a formulation suitable for oral administration, subcutaneous injection, or other methods for administering an active agent to an animal known in the pharmaceutical arts.

Amounts of a disclosed compound as described herein in a formulation may vary according to s such as the e state, age, sex, and weight of the individual. Dosage regimens may be adjusted to provide the m therapeutic response. For example, a single bolus may be administered, several divided doses may be administered over time or the dose may be tionally reduced or increased as ted by the exigencies of the therapeutic situation. It is especially advantageous to formulate parenteral compositions in dosage unit form for ease of administration and uniformity of dosage. Dosage unit form as used herein -20_ refers to physically discrete units suited as unitary dosages for the mammalian subjects to be treated; each unit containing a predetermined quantity of active compound calculated to produce the d therapeutic effect in association with the required ceutical r.

The specification for the dosage unit forms of the invention are dictated by and directly dependent on (a) the unique characteristics of the compound selected and the particular therapeutic effect to be achieved, and (b) the limitations inherent in the art of compounding such an active nd for the treatment of sensitivity in individuals.

Therapeutic compositions typically must be sterile and stable under the conditions of manufacture and storage. The composition can be formulated as a on, microemulsion, liposome, or other d structure suitable to high drug tration. The carrier can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), and suitable mixtures f The proper fluidity can be maintained, for example, by the use of a coating such as lecithin, by the nance of the required particle size in the case of dispersion and by the use of surfactants. In many cases, it will be preferable to include isotonic agents, for example, sugars, cohols such as ol, sorbitol, or sodium chloride in the composition.

Prolonged absorption of the able compositions can be brought about by including in the composition an agent which delays absorption, for example, monostearate salts and gelatin.

The compounds can be administered in a time release formulation, for example in a composition which includes a slow e polymer. The compounds can be prepared with carriers that will protect the compound against rapid release, such as a controlled release ation, including implants and microencapsulated delivery systems. Biodegradable, biocompatible polymers can be used, such as ethylene vinyl acetate, polyanhydrides, polyglycolic acid, collagen, polyorthoesters, polylactic acid and polylactic, polyglycolic copolymers (PLG). Many s for the preparation of such formulations are generally known to those skilled in the art.

Sterile injectable solutions can be prepared by incorporating the compound in the required amount in an appropriate solvent with one or a combination of ingredients enumerated above, as required, ed by filtered sterilization. Generally, dispersions are prepared by incorporating the active compound into a sterile vehicle which contains a basic dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of e inj ectable solutions, the preferred methods of preparation -21_ are vacuum drying and freeze-drying which yields a powder of the active ingredient plus any additional d ingredient from a previously sterile—filtered on thereof.

In accordance with an alternative aspect of the invention, a compound may be formulated with one or more onal compounds that enhance the solubility of the compound.

Methods Methods for treating a condition in a patient in need thereof by administering a therapeutically effective dose of a compound described herein are provided. In some ments, the condition may be a mental condition. For e, a mental illness may be treated. In r aspect, a nervous system condition may be treated. For example, a condition that affects the central nervous system, the peripheral nervous system, and/or the eye may be treated. In some embodiments, neurodegenerative diseases may be treated.

In some embodiments, the methods include administering a compound to treat patients suffering from autism, anxiety, depression, r disorder, attention deficit disorder, attention deficit hyperactivity disorder (ADHD), schizophrenia, a psychotic er, a psychotic symptom, social withdrawal, obsessive—compulsive disorder (OCD), phobia, post— traumatic stress syndrome, a behavior er, an impulse control disorder, a substance abuse er (e. g., a withdrawal symptom, opiate addiction, nicotine addiction, and ethanol addition), a sleep disorder, a memory disorder (e. g., a deficit, loss, or d y to make new memories), a learning disorder, urinary incontinence, multiple system atrophy, ssive supra—nuclear palsy, Friedrich's ataxia, Down’s syndrome, fragile X syndrome, tuberous sclerosis, olivio—ponto—cerebellar atrophy, cerebral palsy, drug-induced optic neuritis, ischemic retinopathy, diabetic retinopathy, glaucoma, dementia, AIDS dementia, Alzheimer’s disease, Huntington’s chorea, spasticity, myoclonus, muscle spasm, Tourette's syndrome, epilepsy, cerebral ischemia, stroke, a brain tumor, traumatic brain injury, cardiac arrest, myelopathy, spinal cord injury, peripheral neuropathy, acute neuropathic pain, and chronic neuropathic pain.

In some embodiments, methods of treating a memory er associated with aging, phrenia, special learning disorders, seizures, post—stroke convulsions, brain ischemia, ycemia, cardiac arrest, sy, migraine, AIDS dementia, Huntington’s chorea, Parkinson’s disease, early stage Alzheimer’s disease, and mer’s disease are contemplated.

In certain embodiments, methods for treating schizophrenia are provided. For example, paranoid type schizophrenia, disorganized type schizophrenia (i.e., hebephrenic -22_ schizophrenia), catatonic type phrenia, undifferentiated type schizophrenia, residual type schizophrenia, post—schizophrenic depression, and simple schizophrenia may be treated using the methods and compositions contemplated herein. Psychotic disorders such as schizoaffective disorders, delusional disorders, brief psychotic disorders, shared psychotic disorders, and psychotic disorders with delusions or hallucinations may also be treated using the compositions plated herein.

Paranoid schizophrenia may be characterized where delusions or auditory hallucinations are present, but t disorder, disorganized or, or affective flattening are not. Delusions may be utory and/or grandiose, but in addition to these, other themes such as jealousy, religiosity, or somatization may also be present. Disorganized type schizophrenia may be characterized where thought disorder and flat affect are present together.

Catatonic type schizophrenia may be terized where the patient may be almost immobile or exhibit agitated, purposeless movement. Symptoms can include catatonic stupor and waxy flexibility. Undifferentiated type schizophrenia may be characterized where psychotic symptoms are present but the criteria for paranoid, disorganized, or catatonic types have not been met. Residual type schizophrenia may be characterized where positive symptoms are present at a low ity only. Post-schizophrenic depression may be terized where a depressive episode arises in the aftermath of a schizophrenic illness where some low—level schizophrenic ms may still be present. Simple schizophrenia may be characterized by insidious and progressive development of prominent negative symptoms with no history of psychotic episodes.

In some embodiments, methods are provided for treating psychotic symptoms that may be present in other mental disorders, including, but not limited to, bipolar disorder, borderline personality disorder, drug cation, and drug-induced sis. In another embodiment, methods for treating delusions (e.g., izarre") that may be present in, for example, delusional disorder are provided.

Also provided are s for treating social withdrawal in conditions including, but not limited to, social anxiety disorder, avoidant personality disorder, and schizotypal personality disorder.

[0082] In some embodiments, methods are provided for treating athic pain. The neuropathic pain may be acute or chronic. In some cases, the neuropathic pain may be associated with a condition such as herpes, HIV, traumatic nerve , stroke, post-ischemia, algia, reflex sympathetic dystrophy, complex regional pain syndrome, spinal cord -23_ injury, ca, phantom limb pain, diabetic neuropathy, and cancer chemotherapeutic—induced neuropathic pain. Methods for enhancing pain relief and for providing analgesia to a patient are also plated.

Further contemplated methods include a method of treating autism and/or an autism spectrum disorder in a patient need thereof, comprising administering an effective amount of a compound to the t. In an embodiment, a method for reducing the symptoms of autism in a t in need thereof is contemplated, comprising administering an effective amount of a disclosed compound to the patient. For example, upon administration, the compound may decrease the incidence of one or more symptoms of autism such as eye contact nce, failure to socialize, ion deficit, poor mood, hyperactivity, abnormal sound sensitivity, inappropriate speech, disrupted sleep, and perseveration. Such decreased incidence may be measured relative to the incidence in the untreated individual or an untreated individual(s).

Also provided herein is a method of modulating an autism target gene expression in a cell comprising contacting a cell with an effective amount of a compound described herein.

The autism gene expression may be for example, selected from ABAT, APOE, CHRNA4, GABRA5,GFAP, GRINZA, PDYN, and PENK. In another embodiment, a method of modulating synaptic plasticity in a patient suffering from a synaptic plasticity related disorder is ed, comprising administering to the patient an effective amount of a compound.

In another embodiment, a method of treating mer’s disease, or e.g., treatment of memory loss that e. g., accompanies early stage Alzheimer’s disease, in a patient in need thereof is provided, comprising administering a compound. Also provided herein is a method of modulating an Alzheimer’s amyloid n (e. g., beta amyloid peptide, e. g. the isoform A0142), in-vitro or in—vivo (e.g. in a cell) comprising contacting the protein with an effective amount of a compound is disclosed. For example, in some embodiments, a nd may block the y of such amyloid n to inhibit long-term potentiation in hippocampal slices as well as tic neuronal cell death. In some embodiments, a disclosed compound may provide neuroprotective properties to a mer’s patient in need f, for example, may provide a therapeutic effect on later stage Alzheimer’s —associated neuronal cell death.

In a further embodiment, a method of treating depression sing administering a compound described herein is provided. In some embodiments, the treatment may relieve depression or a m of depression without ing behavior or motor coordination and without inducing or promoting seizure activity. Exemplary depression conditions that are expected to be treated according to this aspect of the invention include, but are not limited to, -24_ major depressive er, dysthymic disorder, psychotic depression, postpartum depression, premenstrual syndrome, premenstrual ric disorder, seasonal affective disorder (SAD), bipolar er (or manic depressive disorder), mood disorder, and depressions caused by chronic medical conditions such as cancer or c pain, chemotherapy, chronic stress, and post traumatic stress disorders. In addition, patients suffering from any form of sion often experience anxiety. Various symptoms associated with anxiety include fear, panic, heart ations, shortness of , fatigue, nausea, and headaches among . Anxiety or any of the ms f may be treated by administering a compound as described herein.

Also provided herein are methods of treating a condition in treatment-resistant patients, e. g., patients suffering from a mental or central nervous system condition that does not, and/or has not, responded to adequate courses of at least one, or at least two, other compounds or therapeutics. For e, ed herein is a method of ng depression in a treatment resistant patient, comprising a) optionally fying the patient as treatment resistant and b) administering an effective dose of a compound to said patient.

[0088] In some embodiments, a compound described herein may be used for acute care of a patient. For example, a compound may be administered to a patient to treat a particular episode (e.g., a severe episode) of a condition contemplated herein.

Also contemplated herein are combination therapies sing a compound in combination with one or more other active agents. For example, a compound may be combined with one or more antidepressants, such as tricyclic antidepressants, s, SSRI's, and double and triple uptake inhibitors and/or anxiolytic drugs. Exemplary drugs that may be used in combination with a compound include Anafranil, Adapin, Aventyl, Elavil, Norpramin, Pamelor, Pertofrane, Sinequan, Surmontil, Tofranil, Vivactil, Parnate, Nardil, Marplan, Celexa, Lexapro, Luvox, Paxil, Prozac, Zoloft, Wellbutrin, Effexor, Remeron, Cymbalta, Desyrel (trazodone), and Ludiomill. In another example, a compound may be combined with an antipsychotic tion. Non-limiting examples of antipsychotics include butyrophenones, phenothiazines, thioxanthenes, clozapine, olanzapine, risperidone, quetiapine, ziprasidone, amisulpride, asenapine, paliperidone, iloperidone, zotepine, sertindole, lurasidone, and aripiprazole. It should be understood that combinations of a compound and one or more of the above therapeutics may be used for treatment of any suitable condition and are not limited to use as antidepressants or antipsychotics. 2014/013619 -25_ EXAMPLES The following examples are provided for illustrative purposes only, and are not intended to limit the scope of the disclosure.

Table 1 below shows some exemplary compounds of the disclosure and es physiochemical characteristics of the compounds.

Table 1.

Compound Structure Molecular Weight (Da) Compound X 227 Compound Y Compound Z 28—19 423.5032 0.634639 “I V —20 381.4665 0.193514 -26— 2S—21 341.4027 —0.243061 113.17 2S—24 395.4931 0.610089 90.39 2S-27 395.4931 89 90.39 2S-30 409.5197 1.02666 90.39 2S-8 383.4824 0.808343 99.18 -27_ 2S—9 395.4931 0.789186 99.18 2S—FNL-10 ‘5: 417.4986 1.28851 99.18 2S-FNL—11 317.3828 0.005320 81.67 ix 9 28-FNL—12 359.4195 —0.384737 89.95 2S—FNL—13 27 0.858785 89.95 -2g_ 2S—FNL—14 409.4369 294 13 8.1 2S—FNL—15 409.4369 —1.65688 138.1 2S-FNL—16 423.3444 —2.94007 120.59 2S-FNL—17 361.3956 —1.88186 115.73 ZS-FNL— 1 8 419.4748 —0.35934 124.96 ZS—FNL-19 4333823 9 107.45 ZS—FNL-Z 327.3761 —0.659636 113.17 28-FNL-20 389.4488 -0.696233 1 15.73 28—FNL_21 213.2337 —2.3594 95.66 28—FNL_22, 313.3495 107621 113.17 28—16 -30_ 2S—FNL-23 405.4482 —0.769835 124.96 2S—FNL—24 305.3324 —2.01339 107.45 2S-Fqur25 22 -1 10673 115.73 2S-FNL—26 281.3507 —1.08968 72.88 28-FNL—27 359.848 —0.648554 78.95 _ 31 _ 28—FNL—28 241.2869 -1.52625 95.66 If A 3 A“ U :<\ 1 3% H7}: maxi: \f‘f 111”"! 28—FNL-29 433.5013 0.051154 124.96 28-FNL-3 227.2603 -1.94283 95.66 2S-FNL—30 55 107.45 ZS-FNL-31 403.4754 —0.285738 115.73 2S—FNL—32 295.3773 —0.673 104 72.88 ‘1{5*wa.2 2: W‘“ :32»: f.- 3' p IE <\ 5: x» A m ~"$\V $va» 2,... 3" 7 ] "2 szwfi} xg‘g NN x $55 LENS: \- 2S—FNL—33 341.4027 —0.243061 113.17 2S-FNL-34 69 -1.52625 95.66 2S-FNL—35 295.3773 —0.673 104 72.88 2S-FNL—36 355.4293 0.173514 113.17 : ‘ <. _ 33 _ 2S—FNL—37 255.3134 —1. 10968 95.66 2S—FNL—38 309.4039 —0.256529 72.88 2S-FNL-4 297.3501 -1.08936 103.94 2S-FNL—5 426.4689 —0. 121843 134.65 —6 326.3913 —0.766518 118.96 -34_ ZS—FNL—7 262.736 71 101.45 firm“ {.3 Lr.r.rm\§fl-LW (fixqu b x a:< \ng‘o 1'36 ‘” M :3 ZS—FNL—8 397.3899 —0.47485 81.67 ZS—FNL-9 409.4006 —0.494007 81.67 Example 1 — Synthesis of Compound X Scheme 1. -35_ O OBn O O St -3 St —4 N OCH LiHMDS ii EtOH N 00H3 (oclzB o 3 ‘ aq.NaOH \ OH O BOM-Cl Step 5 OH Step 8 Step 7 Step 8 —> N“...

Pd/Ct H2 Int D,EDC| BocO DTAD PPh3 ..OBn PdC OH \ 0 I"OBn Bot:O lice: Step9 Step 10 Nun-- NIIII EDCI NH4CI -IIOH limo .‘I'FAO Compound X —>HO)—A?:IOH StepB StepD Br K2003 BnBr MeOH.HCI NHBoc Bra—iffim StepCNHBoc £918anNHBoc —>Bno>_?~o,3nNH2_HC|Int-D S nthesis of 2S 3R tert-butox carbon 1 amino h drox butanoic acid A To a stirred solution of L—threonine (SMl) (100 g, 0.84 mol) in 1,4—dioxane (500 mL) and water (800 mL) was added Na2C03 (178 g, 1.67 mol) and stirred at RT for 30 min.

The reaction mixture was cooled to 0°C, Boc—anhydride (219.6 g, 1.007 mol) was added drop wise and stirring was continued for 16 h. After consumption of the starting material (by TLC), the reaction mixture was concentrated under reduced pressure and ed residue was neutralized using 1N HCl (pH~4). The s layer was extracted with EtOAc (2 x 250 mL).

The separated organic extracts were washed with brine, dried over anhydrous NaZSO4, filtered and concentrated under reduced pressure to afford A (160 g, 87%). 1H-NMR: (500 MHz, DMSO-d6): 8 6.30 (d, 1H), 4.07—4.01 (m, 1H), 3.90 (d, 1H), 1.99 (s, 1H), 1.42 (s, 9H), 1.09 (d, 3H).

LCMS (m/z): 218.1 [Ml—1] S nthesis of 2S 3R benz 10X tert-butox carbon 1 amino butanoic acid B To a stirred solution of A (100 g, 0.45 mol) in DMF (600 mL) was added 60% NaH (36.5 g, 0.91 mol) portion wise at —20°C under N2 here and stirred for 2 h. To this was -36— added benzyl bromide (66.8 mL, 0.55 mol) drop wise and the reaction mixture was stirred at RT for 12 h. After consumption of the starting material (by TLC), the reaction mixture was quenched with ice cold water and washed with diethyl ether (2 x 250 mL). The separated aqueous layer was acidified using 1N HCl and extracted with EtOAc (2 x 250 mL). The combined c layers were dried over anhydrous NaZSO4 and concentrated under reduced pressure to afford B (100 g, 71%).

Synthesis of 12S: 3R2-benzyl 3-gbenzyloxy2g gtert—butoxycarbonylz amino! butanoate 1C1 To a stirred solution of B (100 g, 0.32 mol) in DMF (400 mL) was added K2CO3 (111.6 g, 0.81 mol) under N2 atmosphere and stirred for 30 min. To this was added benzyl bromide (47.4 mL, 0.38 mol) drop wise and stirred at RT for 12 h. The on mixture was quenched with ice cold water and extracted with diethyl ether (2 x 250 mL). The separated the organic layer was washed with brine, dried over anhydrous NaZSO4 and concentrated under reduced pressure. The crude al was purified by silica gel column chromatography eluting with 5% EtOAc/n—hexane to afford C (80 g, 62%). 1H-NMR: (400 MHz, DMSO'dfi): 5 7.41-7.25 (m, 10H), 5.09 (s, 2H), 4.55-4.50 (m, 1H), 4.34- 4.30 (m, 1H), 2.09 (s, 3H), 1.42 (s, 9H), 1.15 (d, 3H).

S s of 2S 3R -ben lZ-amino ben 10x butanoate Int-D To a d solution of C (80 g, 0.20 mol) in methanol (100 mL) was added methanolic HCl (70 mL) under N2 atmosphere and stirred for 12 h. After consumption of the starting material (by TLC), the reaction mixture was concentrated under d pressure. The crude material was washed with n—hexane and dried under reduced pressure to afford Int-D (45 g, 75%) as HCl salt. 1H-NMR: (400 MHz, DMSO-d6): 5 7.35-7.30 (m, 10H), 5.25 (q, 2H), 4.58-4.52 (m, 3H), 4.37 (d, 1H), 4.27 (br s, 1H), .10 (m, 1H), 1.30 (d, 3H).

LCMS (m/z): 300.2 [M++1] S nthesis of S -meth l rrolidine-Z-carbox late 2 To a d solution of ine 1 (100 g, 0.87 mol) in methanol (800 mL) was added thionyl chloride (76.9 mL, 1.04 mol) slowly drop wise at 0°C. The reaction mixture was heated to reflux for 12 h. After consumption of the starting material (by TLC), the reaction was concentrated under reduced pressure. The residue was washed with n—hexane to afford 2 (143.9 g, HCl salt). -37_ 1H—NMR: (400 MHz, CDC13): 5 3.89 (s, 3H), 3.68-3.62 (m, 2H), 3.59—3.47 (m, 2H), 2.49—2.37 (m, 1H), 2.27—2.05 (m, 3H).

LCMS (m/z): 166 [M++1] S s of tert-bu h l rrolidine—l 2-dicarb0x late 3 To a stirred solution of 2 (35 g, 0.22 mol) in CHzClz (175 mL) was added Et3N (90 mL, 0.65 mol) ed by Boc—anhydride (56.9 mL, 0.26 mol) at 0°C. The reaction mixture was stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction was diluted with water (100 mL) and extracted with CHzClz (2x 100 mL). The organic layer was washed with water, brine, dried over NaZSO4 and concentrated. The crude material was purified by silica gel column tography eluting with 30% EtOAc/n—hexane to afford 3 (41 g, 95%). 1H-NMR: (400 MHz, CDCl3): 5 4.25—4.21 (m, 1H), 3.75 (s, 3H), 3.57—3.26 (m, 2H), 2.29-2.10 (m, 1H), 1.99—1.75 (m, 3H), 1.45 (s, 9H).

LCMS (m/z): 130 [(M++1)-Boc] S nthesis of l-tert-but lZ-meth 12- ben lox meth l rrolidine—l 2-dicarb0x late To a stirred solution of 3 (100 g, 0.43 mol) in THF (800 mL) was added LiHMDS (873 mL, 0.87 mol) at —78°C and stirred for l h. To this BOM-chloride (93.2 mL, 0.65 mol) was added drop wise at —78°C and stirred for 2 h at -20°C. After consumption of the starting material (by TLC), the reaction was quenched with aqueous NH4C1 solution and extracted with EtOAc. The separated c layer was washed with water, dried over Na2S04 and concentrated to afford 4 (180 g, crude). This material was directly taken for the next step t further purification.

LCMS (m/z): 250 [(M++1)—Boc] S nthesis 0f2- ben 10X meth l tert-butox carbon 1 rrolidine-Z-carbox lic acid To a stirred solution of 4 (100 g, 0.28 mol) in methanol (200 mL) was added 2N NaOH solution (300 mL) at RT. The reaction mixture was heated to reflux for 4 h. After consumption of the starting material (by TLC), the t from the reaction was evaporated under reduced pressure and diluted with EtOAc (100 mL). The aqueous layer was acidified -38_ using citric acid solution and ted with CHzClz (2x 250 mL). The separated organic layer was washed with water, dried over Na2S04 and concentrated to afford 5 (60 g, 63%). : (400 MHz, CDC13): 5 7.37—7.32 (m, 5H), 4.61 (s, 2H), 4.05—3.88 (m, 2H), 3.65-3.42 (m, 2H), 2.54—2.46 (m, 2H), 1.95 (br s, 2H), 1.57 (s, 9H).

LCMS (m/z): 334 [Mt—1] S nthesis of 1- tert—butox carbon 1 h drox meth l rrolidine—Z-carbox lic acid 6 To a stirred solution of 5 (10 g, 29.81 mmol) in methanol (300 mL) was added 50% wet 10% Pd/C (5 g) at RT and stirred for 24 h under H2 atmosphere (balloon pressure). After ption of the starting al (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with methanol. Obtained filtrate was trated under reduced pressure to afford 6 (6 g, 82%). 1H-NMR: (400 MHz, DMSO—ds): 5 12.55 (br m, 1H), 3.99 (d, 1H), 3.88 (d, 1H), 7.65—7.60 (m, 1H), 3.51—3.45 (m, 1H), 3.39-3.34 (m, 1H), 2.32—2.14 (m, 1H), 1.98—1.69 (m, 3H), 1.39 (s, 9H).

S nthesis often—but 12- 2S 3R —1 3—bis benzvlox ~1—oxobutan—2- l carbamo l. —2— ghydroxymethyl] pyrrolidine—l—carboxylate g 7 3 To a stirred solution of 6 (3 g, 12.2 mmol) in CH2C12 (100 mL) was added Int-D (5.8 g, 14.6 mmol), EDCI.HCl (2.8 g, 14.6 mmol) followed by HOBt (1.99 g, 14.6 mmol) and DIPEA (4.8 g, 36.7 mmol) at RT and stirred for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (100 mL) and extracted with CH2C12 (2 x 100 mL). The separated c layer was washed with brine, dried over anhydrous NaZSO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography to afford 7 (1.6 g, 25%). 1H-NMR: (400 MHz, DMSO—d6): 5 8.25—8.12 (m, 1H), 7.31—7.27 (m, 10H), 5.85 (t, 1H), 5.14 (s, 2H), 4.54-4.49 (m, 2H), 4.31 (dd, 1H), 4.15-4.07 (m, 1H), 3.91—3.50 (m, 1H), 3.52—3.37 (m, 1H), 3.31—3.27 (m, 2H), 2.35—2.07 (m, 1H), 1.95—1.90 (m, 1H), 1.73—1.52 (m, 2H), 1.39—1.27 (m, 9H), .12 (m, 3H).

Mass (ESI): m/z 527.4 [M++1] S nthesis of ut 12- 2S 3R -1 3-bis benz 10x 0xobutan l 0xo-2 5- diazaspiro|3.4|octane-5—carboxxlate [8]

[00102] To a stirred solution of 7 (1.4 g, 2.65 mmol) in THF (20 mL) was added triphenylphosphine (1.1 g, 3.98 mmol) and DTAD (1.2 g, 3.98 mmol). The reaction mixture -39_ was stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction was concentrated under reduced pressure. The crude material was d by silica gel column chromatography to afford 8-F1 (0.6 g) and 8-F2 (0.55 g).

S nthesis of 2S 3R 5- tert—butox carbon 1 ox0-2 5-diazas iro 3.4 octan-Z- l hydroxybutanoic acid 191 To a stirred solution of 8—F1 and 8-F2 (0.6 g) in methanol (50 mL) was added 10% Pd/C (120 mg) at RT and stirred for 6 h under H2 here (balloon pressure). After consumption of the starting material (by TLC), the reaction mixture was d through a pad of celite and the pad was washed with methanol. The filtrate was concentrated under reduced re to give crude, ation using diethyl ether afforded 9 (0.3 g, 82%) as an off—white solid. 1H-NMR: (500 MHz, DMSO-d6): 5 12.95 (br s, 1H), 4.97 (br s, 1H), 4.24—4.20 (m, 1H), 4.14— 4.07 (m, 1H), 3.84 (d, 1H), 3.53 (t, 1H), 3.41-3.35 (m, 1H), 3.27-3.22 (m, 1H), 2.14-2.08 (m, 2H), 1.84—1.80 (m, 2H), 1.42 (s, 9H), 1.24 (d, 3H).

LCMS (mlz): 329.6 [M++1] S s oftert-but 12- 2S 3R amino-3—h drox 0X0butan l-l-oxo-Z 5- piro |3.4| octane-S-carboxylate 1101 To a stirred on of 9 (5 g, 15.2 mmol) in CHzClz (100 mL) was added ammonium chloride (2 g, 38.1 mmol), EDCI.HC1 (3.5 g, 18.2 mmol) followed by HOBt (5.9 g, 45.7 mmol) and DIPEA (5.9 g, 45.7 mmol) at RT and stirred for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (100 mL) and extracted with CHzClz (2 x 100 mL). The separated organic layer was washed with brine, dried over anhydrous Na2S04, filtered and concentrated under reduced pressure. The crude material was triturated with EtZO (50 mL) and n-pentane (50 mL) to afford 10 (2.5 g, 51%) as an off- white solid. 1H-NMR: (400 MHz, DMSO-d5)Z 5 7.51 (br s, 1H), 7.19 (br s, 1H), 4.64 (d, 1H), 4.07—3.95 (m, 2H), 3.78 (m, 1H), 3.62—3.35 (m, 2H), 3.27—3.25 (m, 1H), 2.18—2.05 (m, 2H), 1.86-1.74 (m, 2H), 1.41 (s, 9H), 1.12 (d, 3H).

LCMS (m/z): 328.2 [M++1] S s of 2S 3R h drox 1-0X0-2 5-diazas iro 3.4 octan-Z- lbutanamide 1C0mpound X) -40_ To a stirred solution of 10 (2.2 g, 6.70 mmol) in CHzClz (25 mL) was added TFA (7.6 g, 67 mmol) at 0°C and stirred at RT for 2 h. The reaction mixture was concentrated under reduced pressure to afford Compound X (2 g, 87%) as TFA salt. 1H-NMR: (400 MHz, D20): 5 4.33—4.29 (m, 2H), 4.09 (d, 1H), 3.95 (d, 1H), 3.57-3.48 (m, 2H), 2.51—2.46 (m, 2H), 2.25—2.19 (m, 2H), 1.31 (d, 3H).

LCMS (m/z): 455 [2M++l] Exam 1e 2— S nthesis of Com ound Z Scheme 3.

%OH —.O\‘(MeStep1 Step 2 WOMe Step 3 Step 4 H 3'00 LiHMDS aqN30” SOClz MeOH NHCI 0 30620 0 Bom-CI 30/ BCKS-fn Step 8 Step 5 [KS—:40 :flN Step 7 Step6 0ND BOG D'oxane/HC' EDCIHOBT (Q PdCIH2 BOG u 0 "0A0 0 "OAc Conditions OAc 8 Step97f a? N3 20%.,Step 10 N3 Bee O "'OH 0 -. ’OH 9 Compound Z To a stirred solution of (2S, 3R)amino—3—hydroxybutanoic acid (SMZ) (30 g, 0.25 mol) in THF (150 mL) and water (150 mL) was added NaHCO3 (65 g, 0.75 mol) followed by Boc—anhydride (66 mL, 0.302 mol) at 0°C. The reaction mixture was stirred at RT for 16 h.

After consumption of the starting material (by TLC), the reaction mixture was extracted with EtOAc (2 x 150 mL). The aqueous layer was acidified using 2N HCl and then extracted with % MeOH/CHZCIZ. The separated organic extracts were dried over ous NaZSO4, ed and concentrated under vacuum to afford A (30 g, 63%). 1H-NMR: (400 MHz, CDC13): 5 5.92—5.70 (m, 2H), 5.55 (d, 1H), 4.42 (br s, 1H), 4.29 (d, 1H), 1.47 (s, 9H), 1.25 (d, 3H) -41_ LCMS (m/z): 218 [Mt—1] S nthesis of ut 1 2S 3R h drox -l-ox0 rrolidin-l- l butan l ate [B] To a stirred solution of A (13 g, 59.36 mmol) in DMF (65 mL) was added EDCI.HC1 (12.5 g, 65.2 mmol) followed by HOBt (8.8 g, 65.2 mmol) at 0°C. After stirring for min, DIPEA (30.6 mL, 0.17 mol) followed by pyrrolidine (4.6 g, 65.2 mmol) was added to the reaction mixture and stirring was continued for another 16 h at RT. The reaction mixture was washed with water and extracted with EtOAc (2x 100 mL). The organic layer was washed with brine, dried over anhydrous NaZSO4 and trated under vacuum. The crude was purified by column chromatography to afford B (5 g, 31%). 1H-NMR: (400 MHz, CDC13): 6 5.51 (br s, 1H), 4.32 (d, 1H), 4.15—4.10 (m, 1H), 3.77—3.74 (m, 1H), 3.55—3.46 (m, 3H), 1.99—1.94 (m, 2H), 1.91-1.85 (m, 2H), 1.47 (s, 9H), 1.26 (t, 1H), 1.29 (d, 3H).

S s 0f 2R 3S tert-butox carbon 1 amino 0xo—4- rrolidin-l- l Z- l acetate 1 D [ To a stirred solution of B (4 g, 14.7 mmol) in CHzClz (40 mL) was added Et3N (5.1 mL, 36.7 mmol) followed by acetic anhydride (1.7 g, 17.6 mmol) and catalytic amount of DMAP at 0 °C. The on mixture was stirred at RT for 16 h. After ption of the starting material (by TLC), the reaction mixture was diluted with water and separated the organic layer. Organic layer was washed with water, dried over anhydrous NaZSO4 and concentrated under reduced pressure. The crude residue obtained was purified by silica gel column chromatography to give C. To this 1,4-dioxane/HC1 (20 mL) was added and stirred at RT for 2 h. The reaction mixture was concentrated under vacuum and the residue was washed with EtZO (2x 15 mL) to afford D (3.5 g, 97%) as HCl salt. : (500 MHz, DMSO—d6) (Rotamers): 5 8.49 (br s, 3H), 8.15 (br s, 1H), 5.14—5.10 (m, 1H), 4.26-4.22 (m, 1H), .95 (m, 1H), 3.59 (s, 2H), 2.09 (s, 3H), 1.98 (s, 2H), 1.87-1.80 (m, 2H), 1.26 (d, 3H).

LCMS (m/z): 215.1 [M++1] S nthesis of meth l rrolidine—Z-carbox late 1

[00109] To a stirred solution of pyrrolidinecarboxylic acid (SMl) (100 g, 0.87 mol) in methanol (800 mL) was added thionyl chloride (76.9 mL, 1.04 mol) slowly drop wise at 0°C. -42_ The on mixture was heated to reflux for 12 h. After consumption of the starting material (by TLC), the reaction was concentrated under vacuum. The e was washed with n— Hexane and led off the solvent to afford 1 (143.9 g, HCl salt). : (400 MHz, CDC13) (Rotamers): 5 3.89 (s, 3H), .62 (m, 2H), 3.59-3.47 (m, 2H), 2.49—2.37 (m, 1H), 2.27—2.05 (m, 3H).

LCMS (m/z): 166 [M++1] S nthesis of -but lZ-meth l rrolidine-l 2-dicarbox late 2 To a stirred on of 1 (35 g, 0.22 mol) in CHzClz (175 mL) were added Et3N (90 mL, 0.65 mol) followed by Boc—anhydride (56.9 mL, 0.26 mol) at 0 °C. The reaction mixture was stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction was diluted with water (100 mL) and extracted with CHzClz (2x 100 mL). The organic layer was washed with water, brine, dried over NazSO4 and concentrated. The crude material was ed by silica gel column chromatography eluting with 30% EtOAc/Hexane to afford 2 (41 g, 95%). 1H-NMR: (400 MHz, CDC13) (Rotamers): 5 4.25—4.21 (m, 1H), 3.75 (s, 3H), 3.57-3.26 (m, 2H), 2.29—2.10 (m, 1H), 1.99—1.75 (m, 3H), 1.45 (s, 9H).

LCMS (m/z): 130 [(M++l)—Boc] S nthesis of l-tert-but lZ-meth 12- ben 10x meth 1 rrolidine-l 2-dicarb0x late

[00111] To a stirred solution of 2 (100 g, 0.43 mol) in THF (800 mL) was added LiHMDS (873 mL, 0.87 mol) at —78°C and stirred for 1 h. To this BOM-chloride (93.2 mL, 0.65 mol) was added drop wise at —78°C and stirred for 2 h at -20°C. After consumption of the starting material (by TLC), the reaction was quenched with NH4Cl at 0°C. The separated organic layer was washed with water, dried over NaZSO4 and concentrated to afford 3 (180 g, crude). This material was directly taken for the next step without further purification.

LCMS (m/z): 250 [(M++1)—Boc] S nthesis of 2- ben 10x meth l tert-butox carbon 1 rrolidine-Z-carbox lic acid To a stirred solution of 3 (100 g, 0.28 mol) in methanol (200 mL) was added 2N NaOH solution (300 mL) at RT. The reaction mixture was heated to reflux for 4 h. After consumption of the starting material (by TLC), the solvent from the reaction was evaporated -43_ under vacuum and diluted with EtOAc (100 mL). The s layer was acidified using citric acid solution and extracted with CHzClz (2x 250 mL). The separated organic layer was washed with water, dried over NaZSO4 and concentrated to afford 4 (60 g, 63%). 1H-NMR: (400 MHz, CDC13) (Rotamers): 5 7.37—7.32 (m, 5H), 4.61 (s, 2H), 4.05-3.88 (m, 2H), 3.65—3.42 (m, 2H), 2.54—2.46 (m, 2H), 1.95 (br s, 2H), 1.57 (s, 9H).

LCMS (m/z): 334 [Ml—1] S nthesis of tert-bu 12- ZS 3R acetox oxo-l- rrolidin-l- l butan-Z- l carbamoyu-Z-g ] benzyloxy] methyl] pyrrolidine-l-carboxylate [5] To a stirred solution of D (1 g, 2.90 mmol) in DMF (8 mL) was added EDCI.HC1 (0.63 g, 3.28 mmol) followed by HOBt (0.44 g, 3.28 mmol) at 0°C. After being stirred for 5 min, DIPEA (1.3 mL, 7.46 mmol) followed by compound 4 (0.74 g, 3.58 mmol) was added to the reaction e and stirring was continued for another 16 h at RT. The reaction mixture was washed with water and extracted with EtOAc (2x 500 mL). The organic layer was washed with brine, dried over anhydrous NaZSO4 and concentrated under vacuum. The crude was purified by column tography to afford 5 (0.6 g, 38%).

LCMS (m/z): 532 [M++1] S'nthesis oftert—hutyl . ~3-acetoxv-1—oxo—1— rwrolidin-l—vl butan~2— s carbamo 'l -2— h drox meth '1 rrolidine-l—carbox late 6 To a d solution of 5 (4.5 g, 8.40 mmol) in MeOH (40 mL) was added wet 10% Pd/C (1.5 g) under inert atmosphere and stirred for 4 h under H2 atmosphere (balloon re).

The reaction mixture was filtered through celite pad and concentrated under reduced pressure to afford 6 (3.0 g, 81%).

LCMS (m/z): 442.5 [M++1] S nthesis oftert-but 12- 2S 3R acetox rrolidin-l- l butan-Z- l-l-oxo-Z 5-diazaspiroI3.4| octane-S-carboxylate [7] To a stirred on of 6 (3 g, 6.70 mmol) in THF (25 mL) was added triphenylphosphine (2 g, 7.40 mmol) ed by DTAD (2.5 g, 10.2 mmol). The reaction mixture was stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction was concentrated under reduced pressure. The crude al was purified by silica gel column chromatography eluting with 10% MeOH/CH2C12 to afford 7 (1.2 g with TPPO, 43%). -44_ 1H-NMR: (400 MHz, DMSO—d6): 5 5.25—5.19 (m, 1H), 4.65 (d, 1H), 3.61—3.57 (m, 3H), 3.47— 3.42 (m, 2H), 3.41—3.25 (m, 4H), 2.05 (s, 4H), 1.95—1.71 (m, 7H), 1.42 (s, 10H).

LCMS (m/z): 424.4 [M++1] S s 0f 2R 3S oxo—3- l-oxo-Z 5-diazas iro 3.4 octan-Z- l rrolidin-l- l butan-Z-yl acetate 18) A stirred solution of 7 (0.4 g, 0.94 mmol) in 1,4-dioxane/HC1 (5 mL) was cooled to 0°C and stirred at RT for 1 h. After ption of the starting material (by TLC), the reaction mixture was concentrated under reduced pressure. The crude material was washed with n— pentane followed by EtOAc to afford 8 (0.22 g, 65%). : (400 MHz, D20): 5 4.62 (d, 1H), 4.41—4.29 (m, 2H), 4.24 (d, 1H), 3.89—3.77 (m, 3H), 3.54—3.49 (m, 3H), 2.57-2.52 (m, 1H), 2.49 (s, 3H), 2.42—2.00 (m, 8H), 1.30 (d, 3H).

LCMS (m/z): 324.3 [M++1] UPLC : 99.37% S nthesis oftert-but 12- 2S 3R h drox oxo-l- rrolidin-l- l butan-Z- l-l-oxo- 2, 5-diazaspir0 |3.4| octane-S-carboxylate 19) A solution of 7 (0.15 g, 0.41 mmol) in s NH3 (2 mL) was stirred at RT for 4 h. After ption of the starting material (by TLC), the reaction diluted with CHzClz (75 mL). The separated c layer was dried over anhydrous Na2S04 and concentrated under d pressure to afford 9 (0.1 g, 76%).

LCMS (m/z): 382 [M++1] S nthesis of 2- 2S 3R h drox oxo rrolidin-l- l butan 1-2 as iro |3.4| octan-l-one (Compound Z1 To a stirred solution of 9 (0.2 g, 0.63 mmol) in CHzClz (2 mL) was added TFA (0.3 mL) at 0 °C and stirred at RT for 1 h. The reaction mixture was concentrated under vacuum and the residue was diluted with water and extracted with CH2C12 (2x 25 mL). The separated organic layer was dried over anhydrous NaZSO4, filtered and concentrated under vacuum to afford Compound Z (0.2 g, 80%) as TFA salt. 1H-NMR: (400 MHz, D20): 5 4.64 (t, 1H), 4.25-4.21 (m, 1H), 4.09 (d, 1H), 3.99—3.87 (m, 1H), 3.70 (t, 2H), 3.55—3.47 (m, 5H), 2.52—2.34 (m, 2H), 2.25-2.22 (m, 2H), 2.08-1.98 (m, 5H), 1.25 (t, 3H). _ 45 _ LCMS (m/z): 282.4 [M++1] Scheme 2S-I-I o o o O OH Step1 HO OH Step 2 Step 3 NHZ (300)20 NHBoc NaH.BnBr BnO)_?~OHNHBoc Br BnO)_?~OBnNHBoc ZS-A ZS-B 28-0 Step 4 Bn0>_?~o|3n Ether.HCl NHZ‘ HCI ZS-D S nthesis of 2S 3R tert—butox carbon 1 amino h drox butanoic acid 2S-A : ] To a stirring solution of L-threonine (50 g, 420 mol) in THF/water (500 mL/500 mL) were added NaHCO3 (111 g, 1.05 mol) and stirred at RT for 30 min. The reaction mixture was cooled to 0 °C and Boc—anhydride (137 mL, 630 mmol) was added drop wise and the stirring was continued at RT for 16 h. After consumption of the starting material (by TLC), the reaction e was concentrated under reduced pressure and obtained residue was d with water (100 mL) and acidified by using 1N HCI (pH~3). The aqueous layer was extracted with EtOAc (2 x 250 mL). The combined organic layer was washed with brine (1 x 200 mL), dried over anhydrous NaZSO4, filtered and concentrated under reduced pressure to afford compound ZS-A (80 g, 87%) as thick syrup. 1H-NMR: (500 MHz, DMSO-dg): 5 12.5 (br s, 1H), 6.30 (d, J= 8.5 Hz, 1H), 4.50 (br s, 1H), 4.05-4.02 (m, 1H), 3.88-3.86 (m, 1H), 1.39 (s, 9H), 1.08 (d, J: 6.0 Hz, 3H); LCMS m/z: 218.1 [Mil] S nthesis of 2S 3R ben 10x tert-butox carbon 1 amino butanoic acid ZS-B:

[00120] To a stirring solution of 2S-A (40 g, 182 mmol) in DMF (400 mL) was added 60% NaH (18.2 g, 758 mmol) portion wise at —20 °C under N2 atmosphere and stirred for 2 h.

To this added benzyl bromide (66.8 mL, 0.55mol) drop wise and the reaction mixture was stirred at RT for 3 h. After consumption of the starting material (by TLC), the reaction mixture was quenched with ice cold water and washed with diethyl ether (2 x 250 mL). The separated aqueous layer was acidified using citric acid on (100 mL) and ted with EtOAc (2 x 250 mL). The combined c layers were dried over anhydrous Na2S04 and concentrated under reduced pressure to afford compound 2S—B (45 g, 80%) as thick syrup. -46— 1H—NMR: (500 MHz, DMSO-dg): 6 12.64 (br s, 1H), 7.34-7.25 (m, 5H), 6.46 (d, J= 8.5 Hz, 1H), 4.53 (d, J: 11.5 Hz, 1H), 4.39 (d, J= 12.0 Hz, 1H), 4.00—3.98 (m, 2H), 1.39 (s, 9H), 1.15 (d, J= 6.0 Hz, 3H); Synthesis of 12S, 3R1-bengyl 3-gbenzyloxy2ggtert-butoxycarbonyl) amino) butanoate 12S- ] To a stirring solution of compound 2S-B (45 g, 146 mmol) in DMF (400 mL) was added K2CO3 (40 g, 292 mmol) under N2 atmosphere and stirred for 30 min. To this benzyl bromide (21 mL, 175 mmol) was added drop wise at 0 OC and stirred at RT for 16 h. The reaction mixture was quenched with ice cold water and extracted with diethyl ether (2 x 250 mL). The separated organic layer was washed with brine, dried over anhydrous Na2S04 and concentrated under reduced pressure. The crude material was purified by silica gel column chromatography eluting with 20% EtOAc/n—hexane to afford compound 2S-C (48 g, 82%) as thick syrup. 1H-NMR: (500 MHz, DMSO—dg): 5 7.37—7.18 (m, 10H), 6.81 (d, J: 9.0 Hz, 1H), 5.08 (s, 2H), 4.49 (d, J= 12.0 Hz, 1H), 4.32 (d, J= 12.0 Hz, 1H), .22 (m, 1H), .98 (m, 1H), 1.38 (s, 9H), 1.15 (d, J: 6.0 Hz, 3H) Mass (ESI): m/z 399.4[M++1]; Synthesis of 12S, 3R)-benzyl 2-amin01bengyloxy) butanoate 12S-D 1: To a ng solution of compound 2S-C (48 g, 120 mmol) in diethylether (50 mL) was added diethylether saturated with HCl (350 mL) at 0 °C and stirred at RT for 10 h.

After consumption of the starting material (by TLC), the reaction mixture was trated under reduced pressure. The crude material was triturated with diethyl ether/n-pentane (50 mL/50 mL) and dried under d pressure to afford compound 2S-D (28 g, 77%) as semisolid (HCl salt). 1H-NMR: (400 MHz, DMSO—d6): 8 8.59 (s, 2H), 7.50—7.25 (m, 10H), 5.23 (d, J: 12.5 Hz, 1H), 5.16 (d, J: 12.5 Hz, 1H), 4.54 (d, J: 12.0 Hz, 1H), 4.36 (d, J: 12.0 Hz, 1H), .09 (m, 1H), 4.09—3.99 (m, 1H), 1.29 (d, J: 6.5 Hz, 3H) Mass (ESI): m/z 299.4[M++1]; Scheme 2S-I-2 -47_ OH o Step 1 0\ \ Step 2 Step 3 Step 4 fl 0 SOCI2 fl NaOH (Boc)2O | LiHMDS N MeOH ' HCP B°° O BOM-CI Boc 2S-E 2S-F 2S-G WOH —>p MOHSte 5 e—p>6 0%”flSt Step7 Pd-C/H2 "OBn . 28-D HATU C Io DIAD PPh3 3000NHgILIOBn ZS-H ZS-l ZS-K Step 8 Pd-C/H2 B00 0 S nthesis of meth l rrolidine-Z-carbox late ZS-E : To a stirring solution of L-proline (50 g, 434 mmol) in methanol was added thionyl chloride (37.5 ml, 521 mmol) at 0 °C and heated to 70 0C for 16 h. The reaction mixture was brought to RT and concentrated under vacuum to afford compound ZS-E as (70 g, 99 %) as thick syrup (hydrochloride salt). 1H-NMR: (500 MHz, g): 5 .13 (m, 1H), 3.65 (s, 3H), 3.35-3.30 (m, 2H), 2.23— 2.15 (m, 1H), 1.86—1.78 (m, 3H), 1.41 (s, 9H); LCMS m/z: 129 [M++l] S nthesis of 1-tert—but lZ-meth l rrolidine-l 2-dicarb0x late ZS-F : ] To a stirring solution of compound ZS-E (70 g, 422 mmol) in CHZCIZ (700 mL) were added Et3N (183 mL, 1.26 mol) at 0 OC and stirred for 10 min. After added Boc-anhydride (184 mL, 845 mmol) at 0 °C and the reaction mixture was stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction was diluted with water (200 mL) and extracted with CH2C12 (2 x 200 mL). The combined organic layer was washed with citric acid (1 x 150 mL), brine (l x 200 mL). The c layer was dried over NaZSO4 and concentrated under reduced pressure to afford crude nd which was purified by column chromatography by eluting 50% EtOAC/n—hexane to obtain compound 2S-F (80 g, 83%) as thick syrup. .48_ 1H—NMR: (400 MHz, DMSO—dg): 5 4.15—4.13 (m, 1H), 3.65 (s, 3H), .30 (m, 2H), 2.23— 2.15 (m, 1H), 1.86—1.78 (m, 3H), 1.41 (s, 9H); LCMS m/z: 229 [(M++1)-Boc].

S nthesis of 1-tert-bu 12-meth 12- ben 10x meth l rrolidine—l rbox late 123-ng To a stirring solution of compound 2S-F (25 g, 109 mmol) in THF (250 mL) was added LiHMDS (240 mL, 240 mmol) at -20 °C and stirred for 2 h. To this BOM-chloride (23 mL, 163 mmol) was added drop wise at —30 °C and stirred for 2 h. After consumption of the starting material (by TLC), the reaction was quenched with aqueous NH4C1 solution (100 mL) and extracted with EtOAc (2 x 200 mL). The combined organic layer was washed with water (2 x 150 mL) followed by brine on (2 x 100 mL). The organic layer was dried over Na2804 and concentrated to obtain crude compound which was purified by column chromatography by eluting 10% EtOAc/n-hexane to afford compound ZS-G (30 g, 79%) as thick syrup. 1H-NMR: (500 MHz, DMSO—dg): 5 7.36—7.22 (m, 5H), 4.59—4.48 (m, 2H), .88 (m, 1H), 3.63 (s, 3H), 3.49—3.35 (m, 2H), 3.34—3.30 (m, 1H), 2.31-2.23 (m, 1H), 2.04-1.89 (m, 2H), 1.82— 1.78 (m, 1H); LCMS m/z: 349.4 [(M++1)—Boc] S nthesis of 2- benz 10x meth l tert-butox carbon 1 rrolidine—Z-carbox lic acid 12S-H1:

[00126] To a ng solution of compound ZS-G (30 g, 86 mmol) in methanol (70 mL) was added NaOH solution (6.88 g in 70 mL H20) at RT. The reaction e was heated to 70 °C for 16 h. After consumption of the starting material (by TLC), the solvent from the reaction was evaporated under reduced re and diluted with EtOAc (2 x 200 mL). The separated aqueous layer was acidified using citric acid solution (pH~3) and extracted with EtOAc (2 x 250 mL). The combined c layer was dried over NaZSO4 and concentrated to afford crude was triturated with n—hexane to obtain compound ZS-H (25 g, 86.8%) as an off—white solid. 1H-NMR: (400 MHz, DMSO—dg): 8 12.35 (br s, 1H), 7.37—7.29 (m, 5H), 4.56—4.48 (m, 2H), 4.06—4.00 (m, 1H), 3.92—3.89 (m, 1H), 3.66—3.45 (m, 1H), 3.37—3.28 (m, 1H), 2.31-2.20 (m, 1H), 2.05-1.97 (m, 1H), 1.87-1.75 (m, 2H), 1.38 (s, 9H); LCMS m/z: 335.3 [M++1] S nthesis of 1- tert-butox carbon 1 h drox meth l ine—Z-carbox lic acid 128-1): -49_ To a stirring solution of nd 2S-H (25 g, 74 mmol) in methanol (150 mL) was added 50% wet 10% Pd/C (7 g) at RT and stirred for 10 h under H2 atmosphere. After consumption of the starting material (by TLC), the reaction mixture was filtered h a pad of celite and the pad was washed with methanol (100 mL). Obtained filtrate was concentrated under reduced pressure to afford compound 2S—1 (15 g, 82.8%) as white solid. 1H-NMR: (400 MHz, DMSO—dg): 5 4.66 (br s, 1H), 3.96—3.83 (m, 1H), 3.63—3.59 (m, 1H), 3.49-3.41 (m, 1H), 3.34-3.25 (m, 1H), 2.30-2.17 (m, 1H), 1.95-1.72 (m, 3H), 1.38 (s, 9H).

Mass (ESI): m/z 245 [M++1] S nthesis of tert-bu l 2- 2S 3R -1 3-bis benz 10x 0xobutan l carbamo 1 h drox meth l rrolidine—l-carbox late 2S-J : To a stirring solution of compound 2S-I (18 g, 73.4 mmol) in CH2Clz (180 mL) were added DIPEA (40 mL, 220 mmol), ZS-D (21.9 g, 73.4 mmol), HATU (41.8 g, 110 mmol) at RT and stirred for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (50 mL) and extracted with CHzClz (2 x 100 mL). The combined organic layer was washed with brine, dried over anhydrous Na2S04, filtered and concentrated under reduced pressure. Obtained crude al was purified by silica gel column chromatography eluting with 30% n—hexane to afford compound 2S-J (20 g, 52%) as pale yellow thick syrup. 1H-NMR: (400 MHz, DMSO—dg): 5 8.25—8.12 (m, 1H), 7.31—7.27 (m, 10H), 5.85 (t, J= 4.8 Hz, 1H), 5.14 (s, 2H), 4.54—4.49 (m, 2H), 4.31—4.20 (m, 1H), 4.15-4.07 (m, 1H), .50 (m, 1H), 3.52—3.37 (m, 1H), 3.31—3.27 (m, 2H), 2.35—2.07 (m, 1H), 1.95—1.90 (m, 1H), 1.73—1.52 (m, 2H), 1.39 (s, 9H), 1.19 (d, J= 6.4 Hz, 3H); Mass (ESI): m/z 527.4 [M++1] S nthesis 0f tert-but l 2— 2S 3R -1 3-bis ben 10x 0xobutan l 0xo-2 5- diazaspiro |3.4| -S-carboxylate {ZS-K): ] To a ng solution of triphenylphosphine (24.7 g, 94 mmol) in THF (100 mL) was added DIAD (15.3 g, 75 mmol) at RT and stirred for 30 min. To this added compound 2S- J (20 g, 37.9 mmol) in (10 mL) THF slowly and reaction mixture was stirred at RT for 2 h.

After consumption of the starting material (by TLC), the reaction was concentrated under reduced pressure. The crude material was d by silica gel column chromatography eluting % EtOAc/n—hexane to afford compound 2S-K (17 g, 88%) as pale yellow thick syrup. -50_ 1H-NMR: (400 MHz, DMSO—dg): 5 .26 (m, 5H), 7.23—7.18 (m, 5H), 5.10 (s, 2H), 4.80— 4.73 (m, 2H), 4.60 (s, 2H), 4.31 (s, 2H), 4.05-4.00 (m, 2H), 1.80—1.68 (m, 4H), 1.39 (s, 9H), 1.18 (d, J: 6.0 Hz, 3H); Mass (ESI): m/z 509.4 [M++l] S nthesis of 2S 3R 5- tert—butox carbon l0x0-2 5-diazas iro 3.4 octan-Z- 1 hydroxybutanoic acid {ZS-L): To a ng solution of compound 2S—K (7 g, 13.7 mmol) in methanol (100 mL) was added 10% Pd/C (4 g) at RT and stirred for 6 h under H2 atmosphere. After consumption of the starting material (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with methanol (50 mL). Obtained filtrate was concentrated under reduced pressure to obtained crude, which was ated with n—pentane (50 mL) to afford compound 2S—L (4 g, 88%) as white solid. : (500 MHz, DMSO-dg): 8 12.80 (br s, 1H), 4.78-4.73 (m, 1H), 4.21—4.19 (m, 1H), 4.09 (s, 2H), 3.55-3.46 (m, 2H), 2.09—2.05 (m, 2H), 1.80 (d, .1: 7.0 Hz, 1H), 1.38 (s, 9H), 1.35— 1.28 (m, 2H), 1.17 (d, J= 6.5 Hz, 3H) LCMS m/z: 329.6 [M++1] Scheme 2S-I-3 0 Step 1 0 Step 2 0 Step 3 —’ —’ —> H N2 BocHN BocHN 0“ (BoC)20 \AOH NH4C| \JWHz A ZS-M EDC' ZS-N BocHN\/u\ A / —>Step 4 N’\\ H Step 5 N’\\ NVt [N I N N N / O TFAHzN O/ | NHZOHHCI BOC TFA/DCM 28-0 zs—P zs-Q To a stirring solution of glycine (15 g, 200 mmol) in 1,4-dioxane/water (150 mL/75 mL) were added Na2C03 (53 g, 500 mmol). After added Boc-anhydride (109 mL, 500 mmol) slowly at 0 °C. The reaction mixture was stirred at RT for 12 h. After ption of the starting material (by TLC), the on mixture was concentrated under reduced pressure.

The crude residue was acidified (pH~4) by using citric acid solution and aqueous layer was extracted with EtOAc (2 x 150 mL). The combined organic layer was washed with brine -51_ solution (2 x 100 mL). The organic layer was dried over anhydrous NagsO4, filtered and concentrated under vacuum to afford compound 2S-M (30 g, 85.7%) as white solid. This al was directly used for the next step without further purification. 1H-NMR: (500 MHz, DMSO—d6): 5 12.41 (br s, 1H), 7.04 (t, J: 5.5 Hz, 1H), 3.57 (d, J: 5.5 Hz, 2H), 1.37 (s, 9H); Synthesis of tert-butyl (2-aminooxoethyl) carbamate (2S-N): To a stirring solution of 2S-M (10 g, 57.14 mmol) in CHzClz (100 mL) were added HOBt (15.43 g, 114 mmol), Cl (21.8 g, 114 mmol) followed by NH4C1 (4.54 g, 85.71 mmol) and DIPEA (30.7 mL, 171 mmol) at 0 °C. The reaction mixture was stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was washed with water (2 x 100 mL). Organic layer was dried over anhydrous Na2SO4 and concentrated under reduced pressure to give crude; which was purified by silica gel column tography eluting with 2% MeOH/CHgClz. After compound was triturated with ether (25 mL) and the precipitated solid was filtered to afford ZS-N (2 g, 20%) as white solid. 1H-NMR: (500 MHZ, DMSO—d6): 5 7.52 (br s, 1H), 7.17 (br s, 1H), 3.46 (d, J: 6.5 Hz, 2H), 1.38 (s, 9H); S nthesis of E -tert-but l 2- dimeth lamino meth lene amino 0X0eth l carbamate [ZS-O [: To a ng solution of ZS-N (7 g, 40.22 mmol) in THF (70 mL) was added DMF.DMA (10.7 mL, 80.44 mmol) at RT and heated to 80 0C for 2 h. After consumption of the starting al (by TLC), the reaction mixture was concentrated under d pressure to afford 2S-O (9 g, crude) as brown syrup. This crude al was directly taken for the next step without further purification. 1H-NMR: (500 MHz, DMSO-ds): 5 6.72 (br s, 1H), 4.35 (s, 1H), 3.64 (d, J= 5.5 Hz, 2H), 3.09 (s, 1H), 1.42 (s, 9H); Mass (ESI): m/z 230.2 ; S nthesis of tert-but l 1 2 4-0xadiazol l meth l carbamate ZS-P : To a stirring solution of 2S-O (9 g (crude), 39.30 mmol) in l (80 mL) was added hydroxylamine hydrochloride (5.45 g, 78.60 mmol) under N2 atmosphere. The reaction mixture was heated to 90 OC and stirred for 2 h. After consumption of the starting material (by TLC) ated solvent under reduced pressure and crude residue was diluted with water (75 mL). The aqueous layer was extracted by DCM (3 x 100 mL). The combined organic layer was -52_ washed by brine solution (1 x 100 mL). The organic layer was dried over anhydrous NazSO4 and solvent was concentrated under reduced re to give crude; which was purified by silica gel column chromatography eluting with 25% EtOAc/hexane to afford 2S-P (4 g, 51%). 1H-NMR: (500 MHz, DMSO-d6): 5 8.90 (s, 1H), 7.64 (s, 1H), 4.44 (s, 2H), 1.39 (s, 9H); LCMS m/z: 198.4 [M'—1] S nthesis of 1 2 4-oxadiazol l methanamine 2S- To a stirring solution of 2S-P (1.1 g, 5.52 mmol) in DCM (30 mL) was added trifluoroacetic acid (2.1 mL, 27.63 mmol) at 0 0C for 30 min. The reaction mixture was d at RT for 4 h. After consumption of the starting al (by TLC), the reaction e was concentrated under vacuum. The crude residue was ated with ether (20 mL) to afford 2S- Q (850 mg, 72.6%) as white solid. 1H-NMR: (400 MHz, DMSO-dg): 5 9.13 (s, 1H), 8.90 (br s, 2H), 4.56 (s, 2H); LCMS (ESI): 100.4 [M++1] Scheme 2S-I-4 O Step-1 2 O Step-3 CIH.H2N \/U\O/ BocHN$O/ BocHNdL _’ (300)20 NH2NH2_H20 NHNH2 CH(OEt)3 ZS-R 28-8 N’N Step-4 l \ BocHN H N 0 2 $93 EtOAc.HC| ZS-T 234) S nthesis of meth l tert-butox carbon 1 l cinate 2S-R: To a stirring solution of glycine methyl ester hydrochloride (50 g, 400 mmol) in 1,4 dioxane/water (300 mL/200 mL) were added Na2C03 (84.8 g, 800 mmol) and stirred at RT for 10 min. The reaction mixture was cooled to 0 OC and Boc-anhydride (104 mL, 480 mmol) was added drop wise and the stirring was continued at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was concentrated under reduced pressure and obtained residue was diluted with water (100 mL) and extracted with EtOAc (2 x 250 mL). The combined organic layer was washed with brine (1 x 200 mL) and organic layer was dried over anhydrous NaZSO4, filtered and concentrated under reduced pressure to afford 2S-R (64 g, 84%) as thick syrup. -53_ 1H—NMR: (500 MHz, DMSO—dg): a 7.19 (t, J: 5.5 Hz, 1H), 3.67 (d, J: 6.0 Hz, 2H), 3.62 (s, 3H), 1.38 (s, 9H); LCMS m/z: 190.2 [M++1] S nthesis of tert-but l 2-h drazin loxoeth l carbamate 2S-S : A solution of 2S-R (20 g, 105 mmol) in EtOH (100 mL) was added hydrazine e (15.8 g, 315 mmol) at RT and after stirred at 100 0C for 6 h. After consumption of the starting material (by TLC), ethanol was evaporated under d pressure. Obtained crude material was triturated with n-pentane/diethyl ether (20 mL/20 mL) to afford ZS-S as white solid. 1H-NMR: (400 MHz, DMSO—dé): 5 8.91 (s, 1H), 6.88 (t, J: 5.5 Hz, 1H), 4.16 (s, 2H), 3.47 ( d, J: 6.0 Hz, 2H), 1.37 (s, 9H); LCMS m/z: 190.2 [M++1] S nthesis of tert-but l 1 3 4-oxadiazol l meth l carbamate ZS-T: A solution of 2S-S (14 g, 74 mmol) in yl orthoformate (140 mL) was added p-TSA (catalytic, 140 mg) at RT and after stirred at 80 0C for 4 h. After consumption of starting material (by TLC), triethyl orthoformate was evaporated under reduced pressure. The crude e was purified by column chromatography eluting 20% EtOAc/hexane to afford 2S—T (6.1 g, 41.5%) as an off-white solid. 1H-NMR: (400 MHz, DMSO—d6): 6 10.74 (s, 1H), 7.45 (s, 1H), 4.03 (s, 2H), 1.47 (s, 9H); LCMS m/z: 200.2 [M++1] S nthesis of 1 3 4—oxadiazol l methanamine 2S-U: To a stirring solution of ZS-T (5 g, 25 mmol) in EtOAc (10 mL) was added EtOAc ted with HCl (60 mL) at 0 °C and stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was trated under reduced pressure. The crude material was triturated with diethylether/n-pentane (25 mL/25 mL) and dried under reduced re to afford 2S—U (3 g, 88.7%) as an off—white solid (HCl salt). 1H—NMR: (500 MHZ, DMSO—d6): 5 9.55 (br s, 2H), 7.99 (s, 1H), 3.90 (s, 2H); LCMS m/z: 100 [M++1] Scheme 2S-I-5 -54_ Step2 Bn/hll N~N’B / O+Et0f\n ©/\Br Step1 N3 N” NaN3 DMF Ethyl but--2ynoate ZS-V 28 W1 ZS-WZ ’Bn Bn [N‘N ,N‘N’ N Step3 / N’/ LiOH EC 0 HO O ZS-WZ zs-x2 Synthesis of (azidomethyl) benzene (ZS-V): To a stirring solution of benzyl bromide (30 g, 175mmol) in dimethyl formamide (300 mL) was added sodium azide (45.6 g, 701 mmol) at RT under inert atmosphere. The resultant reaction mixture was stirred at 70 °C for 16 h. After completion of reaction monitored (by TLC), the reaction mixture was allowed to RT; the volatiles were diluted with water (3 00 mL) and ether (200 mL). The separated organic layer was washed by (3 x 200 mL) of d water. The separated organic layer was dried over anhydrous Na;SO4, filtered and concentrated under reduced pressure to afford compound ZS-V (l 8 g, crude) as an ite solid. 1H-NMR: (400 MHz, CDC13): 5 7.40-7.29 (m, 5H), 4.32 (s, 2H).

S nthesis 0f eth l l-benz lmeth l-1H—1 2 3-triazolecarbox late 2S-W2 To a stirring solution of ethyl but—2—ynoate (8.0 g, 71.3 mmol) in toluene (80 mL) was added ZS-V (12.0 g, 107 mmol) at RT under inert atmosphere. The resultant on mixture was heated to 100 °C and stirred for 16 h. The reaction mixture was allowed to RT; the les were evaporated under reduced pressure to which, crude residue was purified by column chromatography by eluting 40% EtOAc/hexane to afford ZS-Wl and 2S-W2 (8.2 g, 47.1%) (separable by column chromatography) 1H-NMR: (400 MHZ, CDC13): 5 7.36—7.31 (m, 3H), 7.16 (t, J= 6.0 Hz, 2H), 5.53 (s, 2H), 4.43 (q, J= 7.2 Hz, 2H), 2.45 (s, 3H), 1.41 (t, J: 7.2 Hz, 3H); Mass m/z: 246.3 [M++1] S nthesis of 1-ben th l-1H-1 2 3-triazole-4—carbox lic acid 2S-X2 To a stirring solution of compound 2S-W2 (8.2 g, 33.4 mmol) in THF/HZO (82 mL/82 mL, 1:1) was added LiOH.H20 (4.2 g, 0.4 mmol) at RT and d for 16 h. After completion of reaction (by TLC), the volatiles were evaporated under reduced pressure. The residue was ed with aqueous 2N HCl and the precipitated solid was filtered and washed -55_ with water (25 mL), dried under reduced re to afford compound ZS-XZ (7.0 g, 96.6%) as an off—white solid. 1H-NMR: (400 MHz, DMSO—d6): 6 13.01 (br s, 1H), 7.40—7.32 (m, 5H), 5.63 (s, 2H), 2.45 (s, 3H); Mass m/z: 218.3 [M++1]; Scheme 2S-I-6 fN Step 1 N/J\CN —> FNPd-C N/J\/NH2 sis of pyrimidin-Z-ylmethanamine (ZS-Y):

[00143] To a stirring solution of 2-cyanopyrimidine (2.0 g, 19.0 mmol) in methanol (50 mL) were added 10%Pd/C (300 mg), 12 N HCl (1.5 mL) under N2 atmosphere. The reaction e was stirred under H2 atmosphere (balloon pressure) at RT for 3 h. After consumption of the starting material (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with methanol. Obtained filtrate was concentrated under reduced pressure to afford crude compound which was triturated with diethyl ether to obtained nd ZS-Y (1.2 g, 44%) as white solid. 1H-NMR: (500 MHz, DMSO-dg): 6 8.87 (d, J= 5.0 Hz, 2H), 8.69 (br s, 2H), 7.52 (t, J: 5.0 Hz, 1H), 4.24 (s, 2H); Mass (ESI): 110.3 [M++1] Scheme 2S-I- 7 HoLo?—OH Step A HO\_O?-OH Step B BnO\_O?-OH NH2 (800)20 NHBoc NaH,BnBr NHBoc zs-z 28-AA Step C BnO&OBn Step D Bn0\_oz¥oen K2C03,BnBr ether-HC' NHBOC NH2_ HCI 28-AB 28—AC S nthesis 0f tert-butox carbon 1 amino h drox r0 anoic acid 2S-Z WO 20783 -56— To a stirring solution of L-serine (76 g, 723 mmol) in 1, 4 dioxane/H20 (350 mL/300 mL) were added NaOH (61 g, 1.51mol), Boc—anhydride (190 mL, 868 mmol) at 0 oC.

The reaction e was stirred at RT for 16 h. After consumption of the starting material (by TLC), the on mixture was acidified with 2N HCl (pH~4) and extracted with EtOAc (5x500 mL). The combined organic extracts were dried over anhydrous Na2S04 and concentrated under reduced pressure to afford 2S-Z (100 g, 67.5%) as yellow syrup. 1H-NMR: (400 MHz, CDC13): 5 6.54 (br s, 1H), 5.77 (br s, 1H), 4.35—4.04 (m, 1H), 3.87—3.84 (m, 2H), 1.45 (s, 9H).

S nthesis 0f benz 10x tert-butox carbon 1 amino ro anoic acid 2S-AA

[00145] To a stirring solution of 2S-Z (50 g, 245 mmol) in DMF (650 mL) was added NaH (60%) (23 g, 563 mmol) at -15 °C and stirred for 2 h. Benzyl bromide (32.8 mL, 269 mmol) was slowly added. The reaction mixture temperature was warmed to RT and stirred for 12 h. After consumption of the starting al (by TLC), the reaction e was poured into chilled water (200 mL) and extracted with diethylether (2x 250 mL). The aqueous layer was acidified with citric acid (pH~4) and extracted with EtOAc (2x500 mL). The combined organic layers were washed with water (3x250 mL). The organic extracts were dried over anhydrous NaZSO4, filtered and concentrated under d pressure to afford 2S-AA (54 g, 75%) as brown syrup. 1H-NMR: (400 MHz, CDC13): 5 7.32—7.26 (m, 5H), 5.43 (d, J = 7.6 Hz, 1H), 4.70—4.46 (m, 1H), 4.45 (s, 2H), 4.13—3.91 (m, 1H), 3.73—3.70 (m, 1H), 1.44 (s, 9H).

S nthesis of -ben 13- benz 10x tert—butox carbon 1 amino ro anoate 2S-AB To a stirring solution of 2S-AA (36 g, 122 mmol) in DMF (250 mL) was added NazCO3 (20 g, 183 mmol) at 0 °C and added benzyl bromide (18 mL, 146 mmol) slowly. The reaction mixture ature was warmed to RT and d for 12 h. After consumption of the starting material (by TLC), the reaction mixture was poured into chilled water (200 mL) and extracted with diethylether (2x 250 mL). The combined organic layers were washed with water (3x250 mL). The organic extracts were dried over anhydrous NaQSO4, filtered and concentrated under reduced pressure to afford 2S-AB (42 g, 91%) as brown syrup was used directly for next step without any purification.

S nthesis 0f -ben no benz 10x r0 anoateh drochloride 2S-AC : To a ng solution of 2S-AB (10 g, 25.9 mmol) in ether saturated with HCl (50 mL) was added at 0 OC and stirred at RT for 12 h. The ed precipitate was filtered and WO 20783 -57_ triturated with diethylether (2x100 mL). The d compound was dried under vacuum to afford 2S-AC (5 g, 60%) as white solid. 1H-NMR: (400 MHz, DMSO-dg): 6 8.66 (s, 2H), 7.38—7.27 (m, 10H), 5.29-5.22 (m, 2H), 4.57- 4.44 (m, 3H), 3.91-3.81 (m, 2H) Scheme 2S—I—8 OH OH 0 Step 1 H QB“ Step 2 Step 3 OH —> No, NI:- N 28-AC,HATU "l DIAD, PPh3 N OB“ Pd--CIH2 o o .

Boc BOG OBn BocO Boc 0 23—1 28-AD 28-AE 284“: S nthesis of tert—butl 2— -1 3-bis ben 10X ox0 r0 anl carbamo 1 h drox meth l rrolidine—l-carbox late 2S-AD: To a stirring solution of compound 2S-I (5 g, 20.4 mmol) in CHzClz (50 mL) were added DIPEA (10.7 mL, 61.2 mmol), 2S-AC (5.8 g, 20.4 mmol), HATU (11.6 g, 30.6 mmol) at 0 °C and stirred to RT for 12 h. After ption of the starting al (by TLC), the on mixture was diluted with water (100 mL) and extracted with CHZCIZ (2 x 100 mL).

The combined organic layer was washed with citric acid (1 x 100 mL) followed by brine solution (1 x 100 mL). The organic layer was dried over anhydrous NaZSO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting with 50% EtOAc/n-hexane to afford compound 2S-AD (8 g, 76.5%) as yellow thick syrup. 1H-NMR: (400 MHz, CD3OD)I 6 7.33—7.24 (m, 10H), 5.23-5.11 (m, 2H), 4.72—4.66 (m, 2H), 4.50—4.44 (m, 1H), 4.18—3.91 (m, 2H), 3.75—3.70 (m, 2H), 3.65—3.40 (m, 2H), 2.34—2.03 (m, 2H), 1.81-1.78 (m, 2H), 1.41 (s, 9H); Mass (ESI): m/z 512.6 [M++l] S nthesis 0f tert-bu 12- S -1 3-bis ben 10X oxo r0 an-Z- l-l-oxo-Z 5-diazas iro |3.4| -S-carboxylate gZS-AE 2: To a stirring solution of triphenylphosphine (640 mg, 2.44 mmol) in THF (5 mL) was added DIAD (392 mg, 1.94 mmol) at RT and stirred for 15 min, then compound 2S- AD (500 mg, 0.97 mmol) in (5 mL) THF was slowly added and reaction mixture was stirred at RT for 2 h. After consumption of the ng material (by TLC), the reaction was concentrated 2014/013619 .53_ under reduced pressure. The crude material was purified by column chromatography by eluting 2% MeOH/DCM to afford compound ZS-AE (450 mg, 93%) as yellow liquid. : (400 MHz, : 5 7.34-7.27 (m, 10H), 5.25-5.14 (m, 2H), 4.78—4.73 (m, 1H), 4.70—4.42 (m, 2H), 4.04-3.98 (m, 1H), 3.93—3.78 (m, 1H), 3.89-3.78 (m, 1H), 3.76-3.68 (m, 1H), 3.45-3.35 (m, 2H), 2.20—2.09 (m, 2H), 1.90-1.78 (m, 2H), 1.46 (s, 9H) LCMS (ESI): m/z 495.5 [M++1] S nthesis of 1- tert-butox carbon 1 h drox meth l rrolidine-Z-carbox lic acid gZS-AF): To a stirring solution of nd 2S-AE (500 mg, 1.01 mmol) in methanol (25 mL) was added 50% wet 10% Pd/C (250 mg) at RT and stirred for 24 h under H2 atmosphere.

After consumption of the starting material (by TLC), the reaction mixture was filtered h a pad of celite and the pad was washed with methanol (20 mL). Obtained filtrate was concentrated under reduced pressure to afford compound 2S—AF (400 mg, crude) as white solid. 1H-NMR: (400 MHz, CD3OD): 5 4.92-4.87 (m, 1H), 4.28-4.07 (m, 3H), 3.63-3.60 (m, 1H), 3.55—3.40 (m, 2H), 2.30—2.25 (m, 2H), .87 (m, 2H), 1.47 (s, 9H); LCMS: 315.3 [M+l] Scheme 2S-I-9 o O Cbz Cbz H2”. O O O ((OH Step1 H2”. Step2 HN, Step3 HNI Step4 H2N, OMe ((0% we 0M8 SOCI CbZ-CI OH 2 OH TBDPS _ OH OTBDPS 251-12 OTBDPS 28-AG 28-AH 28-Al 28-AJ S nthesis of -meth lZ-aminoh drox r0 anoate ZS-AG: To a stirring solution of L-serine (40 g, 0.38 mol) in ol (300 mL) was added SOClz (33.6 mL, 0.45 mol) drop wise at 0 °C and d for l h. The resulting reaction mixture was refluxed for 24 h. After consumption of the starting material (by TLC), the reaction mixture was warmed to RT and concentrated under vacuum and decanted with n- hexane (2 x 200 mL) to afford compound 2S-AG (59.18 g, crude). 1H-NMR: (400 MHz, DMSO-dg): 6 8.62 (s, 3H), 4.08 (d, J: 3.2 Hz, 1H), 3.83 (d, J: 3.6 Hz, 2H), 3.78 (s, 3H); LCMS, m/z: 120.2 [Mt-1] -59_ S s of -meth 12- benz 10x carbon lamino h drox r0 anoate ZS-AH: To a stirring solution of compound 2S-AG (40 g, 0.33 mol) in 1, 4—dioxane (300 mL) and water (100 mL) was added Na2C03 (71.18 g, 0.67 mol) and stirred at RT for 30 min.

The reaction mixture was cooled to 0 OC, benzyl chloroformate (68.5 g, 0.40mol) was added drop wise and the stirring was continued at RT for 8 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with EtOAc (200 mL). The aqueous layer was ted with EtOAc (2 x 200 mL). The separated organic ts were washed with brine, dried over anhydrous NaZSO4, filtered and trated under reduced pressure. The crude material was purified by silica gel column tography eluting with 20% EtOAc/n- hexane to afford compound 2S-AH (53 g, 62%); 1H-NMR: (400 MHz, DMSO-dg): 5 7.49 (d, J= 8 Hz, 1H), 7.37-7.29 (m, 5H), 5.04 (s, 2 H), 4.93 (t, J: 6 Hz, 1H), 4.18—4.13 (m, 1H), 3.78 (s, 3H), 3.67—3.56 (m, 2H) S nthesis of -meth l 2- ben 10x carbon lamino tert-but ldi hen lsil 10x propanoate {ZS-AI): ] To a stirring solution of compound 2S—AH (20 g, 79.20 mmol) in DCM (700 mL) was added imidazole(l6g, 237.6mmol) at 0°C followed by TBDPS (25.9 g, 95.04 mmol) under N2 atmosphere and stirred at RT for 8 h. After ption of the starting material (by TLC), the reaction mixture was diluted with water (100 mL) and the aqueous layer was extracted with DCM (2 x 200 mL). The separated organic layer was washed with brine, dried over ous Na2S04 and concentrated under reduced pressure. The crude material was purified by silica gel column chromatography eluting with 20% EtOAc/n-hexane to afford compound ZS-AI (25 g, 64%). 1H-NMR: (500 MHZ, CDCl3): 5 7.23-7.68 (m, 1H), 7.58 (d, J: 7 Hz, 3H), 7.44-7.37 (m, 9H), 7.34 (d, J: 7.5 Hz, 2H), 5.65 (d, J: 9 Hz, 1H), 5.12 (d, J: 2, 2H), 4.45 (d, J: 9 Hz, 1H), 4.10—4.07 (m, 1H ), 3.91—3.88 (m, 1H), 3.74 (s, 3H), 1.04 (s, 9H); LCMS (m/z): 492.1 [Mil] S nthesis of S -meth lZ-amino tert-bu ldi hen lsil 10x r0 anoate 2S-AJ : To a stirring solution of compound 2S—AI (25 g, 51.12 mmol) in ethanol (250 mL) was added 50% wet 10% Pd/C (15 g) at RT and stirred for 8 h under H2 atmosphere (balloon pressure). After consumption of the ng al (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with ethanol. Obtained filtrate was concentrated under reduced pressure to afford compound 2S—AJ (18 g, 97%) as yellow liquid. _6()_ 1H-NMR: (400 MHz, CD013): 5 7.66—7.61 (m, 4H), 7.43—7.36 (m, 6H), 4.00—3.97 (m, 2H), 3.74(s, 3H), 3.64 (t, J: 4 Hz, 1H), 2.65 (s, 2H), 1.04 (s, 9H); LCMS m/z: 358 [M+—1] Scheme 2S-I-I0 mOH OEt Step 1 OEt Step 2 Step 3 Step 4 O SOCIZ, EtOH fl 0 (800)20 NBOC O OEt LiHMDS 1"! NaOH Boc O 23-AK 23-AL 23-AM Step 5 0 H Step 6 Step 7 OrrOH T ‘ 23-DEDCI B“ DIAD PPh3 ”'OBn pd_-C/H2 Boc o Boc .

"OBn BocO 28-AN ZS-AO 28-AP 28-AQ S nthesis of eth l rrolidine-Z-carbox lateh drochloride ZS-AK: To a stirring solution of L-proline (110 g, 956.5 mmol) in ethanol was added thionyl chloride (141 ml, 1911.3 mmol) and refluxed for 16 h. The reaction mixture was brought to RT and concentrated under vacuum to afford nd ZS-AK as the hydrochloride salt (170 g, 99 %). 1H-NMR: (400 MHz, CDC13): 5 4.15-4.10 (m, 2H), 3.68—3.62 (m, 2H), 3.59—3.47 (m, 2H), .37 (m, 1H), 2.27—2.05 (m, 3H), 1.18 (t, J: 3.6 Hz, 3H); LCMS, m/z: 143 [M++1] S nthesis of 1-tert-but lZ-eth l rrolidine—l 2-dicarb0x late ZS-AL : To a stirring solution of compound ZS-AK (70 g, 0.391 mol) in CH2C12 (700 mL) were added Et3N (170.7 mL, 1.22 mol) followed by hydride (133 g, 0.61 mol) at 0 OC. The reaction mixture was stirred at RT for 12 h. After consumption of the starting material (by TLC), the reaction was d with water (100 mL) and extracted with CH2C12 (2x 200 mL). The organic layer was washed with water (1 x 150 mL), brine (1 x 200 mL), dried over NaZSO4 and concentrated under reduced pressure to afford compound ZS-AL (90 g, 90%) as thick syrup. 1H-NMR: (400 MHz, g): 6 4.15—4.10 (m, 2H), 4.09-4.02 (m, 1H), 3.36—3.29 (m, 2H), 2.25—2.13(m, 1H), 1.87—1.76 (m, 40(s, 9H), 1.18 (t, J= 3.6 Hz, 3H); LCMS, m/z: 144 [(M++1)-Boc]; -61— HPLC: 96.11% S nthesis of l-tert-but l 2-eth l 2- 1-h drox eth l rrolidine—l 2-dicarb0x late 2S- AM): To a stirring solution of compound 2S-AL (5 g, 20.5 mmol) in THF (50 mL) was added LiHMDS (20.3 mL, 20.5 mmol) at —20 °C and stirred for 1 h. To this acetaldehyde (1.2 mL, 20.5 mmol) was added se at -20 °C and stirred for 1 h at -20 °C. After consumption of the starting al (by TLC), the reaction was quenched with aqueous NH4C1 solution and ted with EtOAc (1 x 50 mL). The separated organic layer was dried over Na2SO4 and concentrated to afford crude compound was purified by column chromatography eluting 10% EtOAc/hexane to afford compound 2S-AM (1.8 g, 30%) as pale yellow syrup. 1H-NMR: (500 MHz, g): 5 5.10 (d, J: 8.5 Hz, 1H), 4.54-4.36 (m, 2H), 4.05-3.99 (m, 2H), 3.60-3.49 (m, 1H), 1.97—1.74 (m, 4H), 1.40 (s, 9H), 1.18, 1.15 (dd, J= 7.5 Hz, 6.5 Hz, 3H), 0.96 (d, J= 9.5 Hz, 3H); LCMS, m/z: 188 [(M++1)—Boc] S nthesis of 1- tert—butox carbon 1 l-h drox eth l rrolidine—Z-carbox lic acid jZS-AN): To a stirring solution of compound 2S-AM (10 g, 34.8 mmol) in methanol (30 mL) were added NaOH (2.7 g, 69.6 mmol), HZO/THF (30 mL/30 mL)) at 0 °C. The reaction mixture was heated to 80 0C for 5 h. After consumption of the starting al (by TLC), the solvent was evaporated under reduced pressure. The aqueous layer was acidified using citric acid solution and extracted with EtOAc (2x 100 mL). The separated organic layer was washed with water (1 x 50 mL), dried over NaZSO4 and concentrated to afford compound 2S-AN (4.8 g, 53.3%) as brown sticky solid. 1H-NMR: (500 MHz, DMSO-dg): 6 4.60-4.54 (m, 1H), 3.98 (d, J= 10.0 Hz, 1H), 3.90—3.77 (m, 2H), 3.44—3.34 (m, 1H), 2.01—1.68 (m, 4H), 1.40 (s, 9H), 1.26 (d, J= 10.0 Hz, 3H); LCMS, m/z: 258 (Mil); HPLC (purity): 91.7% S nthesis 0f tert-but l 2— 2S 3R -1 3-bis ben 10x ox0butan l carbamo l hydroxyethyl)pyrrolidine-l-carboxylate (ZS-A0 ):

[00159] To a stirring on of nd 2S-AN (2.0 g, 7.72 mmol) in CH2C12 (50 mL) were added DIPEA (4.2 mL, 22.4 mmol), EDCI.HC1 (2.2 g, 11.5 mmol) followed by HOBt (1.5 g, 11.5 mmol), compound D (2.8 g, 8.35 mmol) a1: 0 °C and stirred for 12 h. After -62— consumption of the starting material (by TLC), the reaction mixture was diluted with water (30 mL) and extracted with CHgClz (2 x 50 mL). The combined organic layer was washed with brine (2 x 50 mL), dried over anhydrous NaZSO4, filtered and trated under reduced pressure. ed Ciude material was purified by silica gel column chromatography eluting % EtOAc/n—hexane to afford compound 2S-AO (1.5 g, 36%) as ess liquid. 1H-NMR: (400 MHz, g): 5 8.47 (t, J= 8.8 Hz, 1H), 7.31—7.19 (m, 10H), 5.73—5.58 (m, 1H), 5.18 (s, 2H), 4.64 (s, 2H), 4.60—4.49 (m, 1H), 4.29 (d, J: 12.0 Hz, 1H), 4.15—4.12 (m, 1H), 3.59—3.59 (m, 1H), 3.24-3.13 (m, 1H), .60 (m, 2H), 1.43—1.38 (m, 2H), 1.35 (s, 9H), 1.18 (d, J: 6.0 Hz, 3H), 1.04 (d, J: 6.4 Hz, 3H); Mass (ESI): m/z 540 [M'-1] S nthesis 0f tert—but l 2- 2S 3R -1 3-bis benz lox 0xobutan l h lox0-2 5- diazaspiro|3.4|0ctane—5—carboxylate (ZS-AP): To a stirring on of triphenylphosphine (1.45 g, 5.53 mmol) in THF (30 mL) was added DIAD (1.12 g, 5.53 mmol) at RT and stirred for 30 min. To this added compound 2S-AO (1.5 g, 2.77 mmol) in (10 mL) THF slowly and reaction mixture was stirred at RT for 2 h. After consumption of the starting material (by TLC), the reaction was concentrated under reduced pressure. The crude material was purified by silica gel column chromatography eluting 20% EtOAc/hexane to afford nd ZS-AP (800 mg, 57%) as pale yellow syrup. 1H-NMR: (400 MHz, DMSO—dg): 5 .18 (m, 10H), 5.07 (s, 2H), 4.61 (s, 2H), 4.38—4.31 (m,1H), 3.77-3.75 (m, 1H), 3.28—3.24 (m, 1H), 2.67—2.66 (m, 1H), 2.22—2.12 (m, 1H), 1.98-1.92 (m, 3H), 1.72—1.60 (m, 1H), 1.40 (s, 9H), 1.18 (d, J= 5.6 Hz, 3H), 1.13 (d, J= 6.4 Hz, 3H) Mass (ESI): m/z 523 [M++1] S nthesis of 2S 3R 5- tert—butox carbon 1 meth o-2 5—diazas iro 3.4 octan- 2-y11hydroxybutanoic acid (ZS-Ag 2): To a ng solution of compound 2S-AP (900mg) in methanol (30 mL) was added 10% Pd/C (300 mg) at RT and stirred for 16 h under H2 atmosphere (balloon pressure).

After consumption of the starting material (by TLC), the reaction mixture was filtered through a pad of celite and washed with methanol (10 mL). Obtained filtrate was concentrated under reduced pressure to afford compound 2S-AQ (480 mg, 82%) as yellow thick syrup. 1H-NMR: (400 MHz, DMSO—dg): 812.80 (br s, 1H), 5.11—4.96 (m, 1H), 4.83—4.04 (m, 3H), 3.40—3.35 (m, 1H), 2.11 (s, 3H), 2.10—2.03 (m, 2H), 1.46 (s, 9H), 1.43—1.39 (m, 6H). 2014/013619 _ 63 _ LCMS: 342 [M'—1] Scheme 2S-I-II CE 0 Step 1 Step 2 Step 3 H Step 4 . , /N , O N Bee O O 0 SOCI2 EtOH (800)20 13°C MeMgBr TFA COOEt 28-AR 28-AS 23-AT WOEt Step 5 wit Step 6 Wit Step 7 Step 8 N o Pd--CIH2 (BOC)2)0 LiHMDS BocO aqNaOH BOM-Cl 28-AU 28-AV 23-AW 23-AX m;MC; OH Step 9 MFR-oStep 10 fiMNI-"OStep 11 Step 12 I Pd/C H2 23DEDC' Bee 0 n,D|AD PPh3 ”OB” C/H-—: BocO Pd ’OBn 28-AY 28-AZ ZS-BA OC-zsBB NIH..- N ”to | o 28-80 S nthesis of eth lS-oxo rrolidine-Z-carbox late ZS-AR: ] To a stirring solution of 5-oxopyrrolidine—2—carboxylic acid (10 g, 77.4 mmol) in ethanol (100 mL) was added thionyl de (6.7 mL, 92.9 mmol) at 0 °C. The reaction mixture was stirred at RT for 16 h. After consumption of the starting material (by TLC), the solvents from the reaction mixture were removed under vacuum. The residue was diluted with EtOAc (50 mL) and stirred over K2CO3. The organic layer was dried over anhydrous Na2804 and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography to afford compound ZS—AR (9 g, 74%). : (400 MHZ, DMSO—dg): 5 7.98 (br s, 1H), 4.16 (t, 3H), 2.37-2.30 (m, 1H), 2.15 (q, 2H), 2.03-1.97 (m, 1H), 1.22 (t, 3H); LCMS, m/z: 157.9 [M++1] S nthesis of 1-tert-but lZ-eth lS-oxo rrolidine-l 2-dicarb0x late ZS-AS : To a stirring solution of compound ZS-AR (9 g, 57.3 mmol) in CHzClz (90 mL) was added DMAP (7.0 g, 57.3 mmol) followed by Et3N (15.9 mL, 114.6 mmol) and Boc- anhydride (36.7 mL, 171.9 mmol) at 0 OC. The reaction mixture was stirred at RT for 16 h. The reaction mixture was d with CH2C12 (50 mL) and washed with aqueous 1N HCl solution 2014/013619 -64— followed by brine. The separated organic layer was dried over anhydrous Na2SO4 and concentrated under vacuum. Obtained crude material was purified by column chromatography eluting with 50% EtOAc/Hexane to afford compound 2S—AS (12 g, 82%). 1H-NMR: (400 MHz, DMSO-dg): 5 4.61 (dd, 1H), 4.19 (q, 2H), 2.46-2.40 (m, 2H), 2.37-2.25 (m, 1H), 1.91—1.85 (m, 1H), 1.42 (s, 9H), 1.22 (t, 3H).

S nthesis of eth 12- tert-butox carbon 1 amino hexanoate 2S-AT : To a ng on of compound 2S-AS (12 g, 46.6 mmol) in THF (120 mL) under inert atmosphere was added MeMgBr (3M in ether) (20.2 mL, 60.6 mmol) at 0 °C and stirred for 2 h. After consumption of the starting material (by TLC), the reaction mixture was quenched with aqueous NH4C1 solution and the aqueous layer was ted with EtOAc (2 x 200 mL). The combined organic extracts were dried over anhydrous NagsO4 and concentrated under reduced pressure. The crude residue obtained was purified by silica gel column chromatography eluting with 20% EtOAc/Hexane to afford compound 2S-AT (10 g, 79%). 1H-NMR: (400 MHz, CDC13): 5 5.14 (br s, 1H), 4.23 (q, 2H), 2.62—2.47 (m, 2H), 2.17 (s, 4H), 1.91-1.82 (m, 1H), 1.45 (s, 10H), 1.26 (t, 3H).

S nthesis of eth lS-meth l rrolidine—Z-carbox late ZS-AU & ZS-AV : To a stirring solution of compound 2S-AT (10 g, ol) in CH2C12 (100 mL) was added TFA (14.89 mL, 194.6 mmol) at 0°C. After being d for 2 h at RT, the reaction mixture was trated under reduced pressure to get compound 2S-AU. Obtained al was dissolved in ethanol (100 mL) and 10% Pd/C (50% wet, 3 g) under N2 atmosphere. The on mixture was stirred under H2 atmosphere (balloon pressure) for 16 h.

The reaction mixture was filtered through a pad of celite and filtrate was concentrated under reduced pressure to afford compound 2S-AV (15 g, crude). This material was directly taken for the next step without further purification.

LCMS, m/z: 158.1 [M++1] S nthesis 0f 1-tert—but lZ-eth lS-meth l rrolidine—l 2-dicarb0x late 2S-AW : To a stirring solution of compound 2S-AV (30 g, 191 mmol) in CH2C12 (150 mL) was added DMAP (23.3 g, 191 mmol) followed by Et3N (79.8 mL, 573 mmol) and Boc— anhydride (104 mL, 477 mmol) at 0 °C. The reaction mixture was stirred at RT for 16 h. The reaction mixture was d with CHZCIZ (50 mL) and washed with water (2x150 mL) followed by brine. The separated c layer was dried over anhydrous Na2SO4 and concentrated under vacuum. Obtained crude material was purified by column chromatography 2014/013619 -65— g with 6% hexane to afford compound ZS-AW (30 g, 61.22%) as pale yellow liquid. 1H-NMR: (500 MHZ, DMSO—d6): 5 4.13—3.86 (m, 4H), 2.15 (d, J: 3.5 Hz, 1H), 1.99—1.82 (m, 2H), 1.52 (t, J: 4.5 Hz, 1H), 1.38 (s, 9H), 1.24 (t, J= 5.5 Hz, 3H), 1.16 (d, J: 6.5 Hz, 3H).

LCMS, m/z: 258 [(M++1) S nthesis of 1-tert-but l 2-eth l 2- benz 10x meth l meth l rrolidine-l 2- dicarboxxlate (ZS-AX): To a stirring on of compound ZS-AW (8.0 g, 31.12 mmol) in THF (70 mL) was added LiHMDS (59 mL, 41.72 mmol) at —78 OC and d for 2 h. To this BOM-chloride (6.56 mL, 41.72 mmol) was added dropwise and stirred for 2 h at —30 °C. After consumption of the starting material (by TLC), the reaction was quenched with aqueous NH4C1 solution (20 mL) and extracted with DCM (30 mL). The separated organic layer was dried over Na2S04 and concentrated to afford crude material was purified by column chromatography eluting with % EtOAc/Hexane to afford compound ZS-AX (11 g, 94.2%) as pale yellow liquid. 1H-NMR: (500 MHZ, DMSO—ds): 6 7.33—7.25 (m, 5H), 4.38 (d, J: 10.5 Hz, 2H), 4.08—3.98 (m, 1H), 3.88 (d, J: 9.5 Hz, 2H), 2.20—2.08 (m, 2H), 1.38 (s, 9H), 1.37—1.29 (m, 4H), 1.19 (t, J: 7.5 Hz, 3H), 1.14-1.10 (m, 3H); LCMS, m/z: 378 (M++1) S nthesis of 2- meth l tert-butox carbon 1 ylic acid gZS-AY 1: To a ng solution of compound 2S-AX (11 g, 29.17 mmol) in CH3OH/THF (22 mL/20 mL) were added 2N NaOH solution (33 mL) at RT. The reaction e was heated to 65 °C for 8 h. After consumption of the starting material (by TLC), the solvent from the reaction was evaporated under reduced pressure and diluted with EtOAc (50 mL). The aqueous layer was acidified using citric acid solution and extracted with CH2C12 (2x 100 mL).The separated organic layer was washed with water (1 X 50 mL), dried over Na2804 and concentrated to afford compound 2S-AY (8 g, 80%). 1H-NMR: (400 MHz, g): 5 12.58 (s, 1H), 7.34—7.28 (m, 5H), 4.54—4.47 (m, 2H), 4.05— 3.87 (m, 2H), 3.70—3.62 (m, 1H), 2.28-2.08 (m, 3H), 1.46—1.37 (m, 1H), 1.28 (s, 9H); LCMS, m/z: 350 [M++1].

Synthesis of 1-(tert-butoxycarbonyl)(hydr0xymethyl)—5-methylpyrrolidine—Z-carb0xylic acid (ZS-AZ): 2014/013619 -66_ To a stirring solution of compound 2S-AY (8 g, 1.45 mmol) in methanol (40 mL) was added 10%Pd/C (4 g) under N2 atmosphere. The reaction mixture was stirred under H2 atmosphere (balloon pressure) at RT for 16 h. After consumption of the starting material (by TLC), the reaction e was filtered through a pad of celite and the pad was washed with ol. Obtained filtrate was concentrated under reduced pressure to afford crude compound which was triturated with n-pentane to obtained compound 2S-AZ (4.5 g, 75.2%) as white solid. 1H-NMR: (500 MHz, DMSO—dg): 5 12.37 (br s, 1H), 4.61 (br s, 1H), 3.95—3.85 (m, 3H), 2.18— 2.06 (m, 3H), 1.44-1.41 (m, 1H), 1.38 (s, 9H), 1.09 (d, J= 6.0 Hz, 3H); LCMS (ESI): m/z 260 [M++1] S nthesis 0f tert-but l 2- 2S 3R -1 3-bis benz 10x 0xobutan l carbamo 1 1hydroxymethyll-S-methylpyrrolidine-l-carboxylate (ZS-BA I: ] To a stirring solution of compound 2S-AZ (3 g, 11.58 mmol) in DCM (30 mL) were added N, N-diisopropylethylamine (6 mL, 34.7 mmol), Int D (5 g, 13.8 mmol), followed by EDCI (2.7 g, 13.8 mmol), HOBT (1.9 g, 13.8 mmol) at 0 °C and stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (20 mL). The separated organic layer was washed with ted NaHCO3 solution (1x50 mL), 2N HCl solution (30 mL) followed by brine solution (1x40 mL). The separated organic layer was dried over anhydrous NaZSO4 and concentrated under reduced pressure to afford crude compound which was purified by column chromatography to obtained compound ZS-BA (2 g, 32.5%) as pale yellow liquid. 1H-NMR: (500 MHz, DMSO—dg): 5 .17 (m, 10H), 5.16—5.10 (m, 2H), 4.50 (t, J= 5.2 Hz, 2H), 4.28 (t, J= 12.0 Hz, 1H), 4.13—4.07 (m, 1H), 3.95 (s, 2H), 2.10—1.85 (m, 4H), 1.40— 1.35 (m, 1H), 1.30 (s, 9H), 1.18, 1.16 (dd, J= 6.4 Hz, 6H); LCMS (ESI): m/z 440.3 [M++1] S nthesis of tert-but 12- 2S 3R -1 3-bis ben 10x 0x0butan-2— th l-l-oxo-Z -diazaspiro |3.4| octane-S-carboxylate ): To a stirring solution of compound ZS-BA (1.0 g, 1.85 mmol) in THF (10 mL) was added triphenylphosphine (0.935 g, 4.62 mmol) and DIAD (0.75 g, 3.70 mmol). The reaction mixture was stirred at RT for 8 h. After consumption of the starting material (by TLC), the reaction e was concentrated under reduced pressure. The crude material was -67— purified by silica gel column chromatography eluting 20% EtOAc/hexane to afford compound 2S—BB (0.8 g, 51%) as yellow liquid. 1H-NMR: (400 MHz, g): 6 .17 (m, 10H), 5.17(s, 2H), 4.79, 4.76 (dd, J: 6.0 Hz, 2H), 4.73 (s, 2H), 4.31-4.18 (m, 2H), 3.84 (t, J: 6.8 Hz, 2H), 2.12 (t, J: 6.8 Hz, 1H), 1.98—1.91 (m, 2H), 1.39 (s, 9H), 1.32, 1.25 (dd, J: 6.0 Hz, 6.4 Hz, 3H), 1.18, 1.09 (dd, J: 6.0 Hz, 6.4 Hz, 3H); LCMS (ESI) :m/z 523.3 [M++1] Synthesis of (2S, 3R)(5-(tert-butoxycarb0nyl)methyl0X0-2, S-diazaspiro [3.4] octan-Z-yl)hydroxybutanoic acid (ZS-BC): To a stirring solution of compound 2S-BB (1 g, 1.91 mmol) in methanol (20 mL) was added 10%Pd/C (400 mg) under N2 atmosphere. The reaction mixture was stirred under H2 atmosphere (balloon pressure) at RT for 16 h. After ption of the starting material (by TLC), the reaction mixture was d through a pad of celite and the pad was washed with methanol. Obtained filtrate was concentrated under reduced pressure to afford compound ZS-BC (0.80 g, crude) as white solid. : (400 MHz, DMSO-dg): 5 12.75 (br s, 1H), 4.80—4.73 (m, 3H), 4.20—4.05 (m, 2H), 3.40, 3.36 (dd, J= 6.8 Hz, 1H), 2.21—2.13 (m, 1H), 2.06—1.99 (m, 2H), 1.53 (t, J: 6.0 Hz, 1H), 1.40 (s, 9H), 1.11, 1.10 (dd, J= 4.8 Hz, 5.2 Hz, 6H); LCMS (ESI): m/z 343.3 [M++1] Scheme 2S-I-12 HO HO Step 1 Step 2 Step 3 N OEt . N 28-DHATU ‘BOC LIHMDS, I}! f anaOH , o CH3CHO Boco Boc ,,0Bn ZS'AW ZS'BD 28-BE 28-BF _>/E><;NHOOBStep 4 NIH"- ”OB“ BocO _)/f>¢O:HStep 5 DIAD PPh3 PdC/H2 ZS-BG 28-BH S nthesis of -but l 2—eth l 2— 1-h drox eth l-S-meth l rrolidine—l 2- dicarboxylate gZS-BD ): .68_ To a stirring solution of compound 2S-AW (20 g, 77.8 mmol) in THF (200 mL) was added LiHMDS (84 mL, 155 mmol) dropwise at -20 °C and stirred for 30 min. To this acetaldehyde (8.77 mL, 155mmol) was added drop wise and stirred at RT for 3h. After consumption of the starting material (by TLC), the reaction was quenched with s NH4Cl solution (100 mL) and ted with DCM (2 x 150 mL). The combined organic layer was washed with brine solution (1 x 150 mL). The separated organic layer was dried over Na2S04 and concentrated to afford crude material was purified by column chromatography eluting with % EtOAc/Hexane to afford compound ZS-BD (16 g, 23.1%) as colorless syrup. : (500 MHz, DMSO-ds): 8 7.33-7.25 (m, 5H),4.38 (d, J= 10.5 Hz, 2H), 4.08-3.98 (m, 1H), 3.88 (d, .1 = 9.5 Hz, 2H), 2.20-2.08 (m, 2H), 1.38 (s, 9H), 1.37—1.29 (m, 4H), 1.19 (t, .1 = 7.5 Hz, 3H), 1.14—1.10 (m, 3H); LCMS m/z: 378 (M++1) S nthesis of 1- utox carbon 1 1-h drox eth lmeth l rrolidine—Z-carbox lic acid {ZS-BE): ] To a stirring solution of compound 2S-BD (15 g, 49 mmol) in EtOH/THF (10 mL/20 mL) were added NaOH (3.98 g, 99 mmol) in water (10 mL) at RT. The reaction mixture was heated to 90 °C for 4 h. After consumption of the ng material (by TLC), the solvent from the reaction was evaporated under reduced pressure and acidified by using citric acid (pH~4). The aqueous layer was extracted with DCM (2 x 200 mL) and the combined organic layer was washed with brine solution (1 x 150 mL). The separated organic layer was dried over NazSO4 and trated to obtained crude nd, which was purified by column chromatography eluting 40% EtOAc/n—hexane to afford compound 2S—BE (8.2 g, 60.7%) as brown syrup. 1H-NMR: (500 MHz, DMSO—dg): 8 12.15 (br s, 2H), 4.54—4.50 (m, 1H), 4.03—4.02 (m, 1H), 2.17—1.77 (m, 3H), 1.41(s, 9H), 1.39-1.09 (m, 3H), 0.99—0.94 (m, 3H); LCMS m/z: 272.4 [M'—1] S nthesis of tert—bu l 2- 2S 3R -1 3-bis benz 10x ox0butan mo 1 1- hydroxyethylQ-S-methylpyrrolidine—l-carboxylate 128-13ng To a stirring on of compound 2S-BE (8 g, 29.3 mmol) in DCM (100 mL) were added N, N—diisopropylethylamine (15.12 mL, 87 mmol), 2S—D (12.13 g, 40.6 mmol) followed by HATU (16.5g, 43.5 mmol) at 0 °C and stirred at RT for 12 h. After consumption of -69_ the starting material (by TLC), the on mixture was diluted with water (100 mL). The separated organic layer was washed with citric acid on (1 x 75 mL) followed by brine solution (1x100 mL). The organic layer was dried over anhydrous NaZSO4 and concentrated under reduced pressure to afford crude nd which was purified by column chromatography by eluting with 40% EtOAc/n-hexane to obtain compound ZS-BF (11g, 68.4%) as pale yellow liquid. 1H-NMR: (400 MHz, DMSO—dg): 5 7.31—7.19 (m, 10H), 5.14-5.06 (m, 2H), 4.59—4.48 (m, 3H), 4.31—4.26 (m, 1H), .00 (m, 2H), .89 (m, 2H), 1.41 (s, 9H), 1.39—1.35 (m, 3H), 1.28— 1.17 (m, 6H), 1.16-1.00 (m, 3H); LCMS (ESI): 555.6 [Mt+1] S nthesis of tert-but l 2- 2S 3R -1 3-bis benz 10x oxobutan l -1 6-dimeth o- 2,5—diazaspiroI3A |0ctane-5—carboxylate {ZS—BC): To a stirring solution of triphenylphosphine (3.5 g, 13.5 mmol) in THF (10 mL) was added DMD (2.72 g, 13.5 mmol) as portion-wise and stirred for 20 min at RT. To this added compound 2S-BF (3 g, 5.4 mmol) in THF (10 mL) slowly at RT and stirred for 3 h.

After consumption of the starting material (by LCMS), the reaction mixture was concentrated under reduced pressure. The crude material was purified by silica gel column chromatography eluting 20% EtOAc/hexane to afford compound 2S-BG (2.5 g, 86.5%) as yellow liquid. 1H-NMR: (400 MHz, DMSO—dg):57.39—7.18 (m, 10H), 5.19—5.10(m, 2H), 4.78-4.49 (m, 3H), 4.34-4.25 (m, 2H), 3.85-3.76 (m,1H), 2.10-1.69 (m, 4H), 1.40 (s,9H), 1.35-1.26 (m, 3H), 1.18- 1.12 (m, 6H); S nthesis of 2S 3R 5— tert—butox carbon 1 -1 6-dimeth l0xo-2 as iro 3.4 octan-Z-yl 2hydr0xybutanoic acid gZS-BH I: To a stirring on of compound 2S—BG (2 g, 3.72 mmol) in methanol (20 mL) was added 10%dry Pd/C (200 mg) under N2 atmosphere. The on mixture was stirred under H2 atmosphere at RT for 12 h. After consumption of the starting material (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with ol (10 mL). Obtained filtrate was concentrated under reduced pressure to afford nd 2S-BH (1.8 g, 60.4%) as yellow solid. 1H-NMR: (400 MHz, DMSO-dg): 5 12.72 (br s,1H), 5.11—4.97 (m, 1H), 4.30—4.15(m,2H), 3.91— 3.76 (m, 2H), 2.18-1.90 (m,3H), 1.40 (s, 9H), 1.37—1.29 (m, 1H), 1.26-1.22(m, 3H), 1.21—1.10 (m. 6H); _ 70 _ LCMS (ESI): 357.5 [M++l] Scheme 2S-I-I3 Step1 BAN 3000 Mop: Step2 HN, CIH Step 3 -,I pyrrolidine OHNQ ()CH3CO20 3 NO dioxane.HCI [42:12:42 0H OAc GAO ZS-A ZS-Bl ZS—BJ ZS-BK S nthesis of tert—but 1 2S 3R h drox 0xo rrolidin-l- l butan-Z- l carbamate (ZS-BI) To a stirring solution of compound ZS-A (13 g, 59.36 mmol) in DMF (65 mL) was added Cl (12.5 g, 65.2 mmol) followed by HOBt (8.8 g, 65.2 mmol) at 0 °C. After being stirred for 5 min, DIPEA (30.6 mL, 0.17 mol) followed by pyrrolidine (4.6 g, 65.2 mmol) was added to the on mixture and ng was continued for another 16 h at RT. The reaction mixture was washed with water and extracted with EtOAc (2x 100 mL). The organic layer was washed with brine, dried over anhydrous Na2804 and concentrated under vacuum.

The crude was purified by column tography to afford nd ZS-BI (5 g, 31%). 1H-NMR: (400 MHz, : 55.51 (br s, 1H), 4.32 (d, 1H), 4.15-4.10 (m, 1H), 3.77-3.74 (m, 1H), 3.55-3.46 (m, 3H), 1.99-1.94 (m, 2H), 1.91—1.85 (m, 2H), 1.47 (s, 9H), 1.26 (t, 1H), 1.29 (d, 3H).

S nthesis 0f 2R 3S tert-butox carbon 1 amino oxo rrolidin-l- l butan-Z- l acetate gZS-BJ and : To a stirring solution of compound 2S-BI (4 g, 14.7 mmol) in CH2C12 (40 mL) was added Et3N (5.1 mL, 36.7 mmol) followed by acetic anhydride (1.7 g, 17.6 mmol) and catalytic amount of DMAP at 0 °C. The reaction mixture was stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water and separated the organic layer. Organic layer was washed with water, dried over anhydrous NaZSO4 and trated under reduced pressure. The crude residue obtained was purified by silica gel column chromatography to give compound ZS-BJ. To this 1, 4—dioxane/HC1 (20 mL) was added and stirred at RT for 2 h. The reaction mixture was concentrated under vacuum and obtained material was washed with Et20 (2x 15 mL) to afford compound ZS-BK (3.5 g, 97%) as HCl salt.

WO 20783 -71_ 1H-NMR: (500 MHz, s) (Rotamers): 5 8.49 (br s, 3H), 8.15 (br s, 1H), 5.14—5.10 (m, 1H), 4.26—4.22 (m, 1H), 3.97-3.95 (m, 1H), 3.59 (s, 2H), 2.09 (s, 3H), 1.98 (s, 2H), 1.87-1.80 (m, 2H), 1.26 (d, 3H).

LCMS (ESI): 215.1 .

Scheme 2S-I-I4 Boo 800 O O O fiOHHN_ Step1 JANHN, Step2 ' HiNHN OEtherH . '2 EDCI a E OBn OBn CI OBn ZS-B 2S-BL ZS-BM S nthesis 0f tert—butl 2S 3R ben 10X 0xo rrolidin-l-l butan-Z-l carbamate ):

[00180] To a ng solution of compound 2S-B (8 g, 25.8 mmol) in DCM (80 mL) were added N, N—diisopropylethylamine (11 mL, 87.4 mmol), pyrrolidine (2.5 mL, 35.4 mmol), followed by EDCI (7.39 g, 38.7 mmol), HOBT (5.2 g, 38.7 mmol) at 0 °C and stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (20 mL). The separated organic layer was washed with saturated NaHCO3 solution (1x25 mL), followed by brine solution (1x30 mL). The separated organic layer was dried over anhydrous Na2SO4 and concentrated under reduced re to afford crude compound which was purified by column chromatography eluting 1% MeOH/DCM to obtained compound 2S- BL (8 g, 86%) as white solid. 1H-NMR: (400 MHz, DMSO—d6): 5 7.34-7.24 (m, 5H), 6.57 (d, J= 4.0 Hz, 1H), 4.53, 4.44 (dd, J: 12.0 Hz, 12.0 Hz, 2H), .28 (m, 1H), 3.74 (t, J= 6.0 Hz, 1H), 3.58—3.53 (m, 1H), 3.42- 3.38 (m, 1H), 3.28-3.24 (m, 2H), 1.82-1.70 (m, 4H), 1.37 (s, 9H), 1.11 (d, J: 6.4 Hz, 3H) Mass (ESI): m/z 363.4 [M++l].

Synthesis of (2S, 3R)amino(benzyloxy)—1-(pyrrolidinyl) butan-l-one ): To a stirring solution of compound 2S-BL (6 g, 16.52 mmol) in ether saturated with HCl (30 mL) was added at 0 °C and stirred at RT for 2 h. After consumption of the starting material (by TLC), the reaction mixture was concentrated under reduced pressure to afford crude compound which was triturated with pentane (15 mL) to obtained compound 2S- BM (4 g, 93%) as white solid. -72_ 1H—NMR: (500 MHz, DMSO—dg): 5 8.25 (s, 2H), 7.36—7.29 (m, 5H), 4.58, 4.48 (dd, J: 12.0, 11.5 Hz, 2H), 4.12 (t, J: 4.5 Hz, 1H), 3.87 (t, J: 5.5 Hz, 1H), 3.60—3.57 (m, 1H), 3.37—3.33 (m, 3H), 1.78—1.70 (m, 4H), 1.22 (d, .1: 6.5 Hz, 3H).

Mass (ESI): M++1].

Scheme 2S-I o OCH3 0 OCH3 fifggioomN‘“ Thr-OMe A020 ZS-H NBOCOBn COB” 23—1 23-2 o OCH3 Step 3 HNL step 4 OCH3 Pd/C, H2 0 DTAD, PPh3 ...OAC [)1 8000 —3 ZS-FNL-1 Synthesis of tert—ButylZ-((benzyloxy)methyl)(((2S,3R)—3-hydroxy—l-methoxy—1- oxobutan-Z-yl)carbamoyl) pyrrolidine-l-carboxylate (ZS-1):

[00182] To a d on of nd ZS-H (2.0 g, 5.97 mmol) in CHzClz (10 mL) was added DIPEA (2.6 mL, 14.92 mmol) followed by HATU (2.26 g, 5.94 mmol) at 0 °C and stirred for 10 minutes. A solution of methyl 2-aminohydroxybutanoate hydrochloride (1 g, .97 mmol) in CHzClz (10mL) was added to the reaction mixture at 0 °C. The resultant reaction e was allowed to warm to RT and stirring was ued for another 3 h. The volatiles were evaporated under reduced pressure. The obtained residue was diluted with water (25 mL) and extracted with CHzClz (2 x 75mL). The organic layer was dried over anhydrous NaZSO4 and concentrated under reduced pressure. The crude was purified by silica gel column chromatography eluting with 40%EtOAc/Hexane to afford nd 28-1 (1.8 g, 67%) as a liquid. 1H-NMR: (400 MHz, DMSO—dg): 5 7.38—7.31 (m, 5H), 5.16 (br s, 1H), 4.54 (s, 2H), 4.28—4.26 (m, 1H), 4.17—4.12 (m, 1H), 3.84—3.82 (m, 1H), 3.62 (s, 3H), 3.54—3.51 (m, 1H), 2.32—2.27 (m, 4H), 1.84—1.78 (m, 2H), 1.42 (s, 9H), 1.06 (d, 3H); LCMS m/z: 451.6 [M++1] S nthesis of tert—Bu 1 2S 3R acet0x methox oxobutan learbamo 1 jgbengyloxflmethgl) pyrrolidine-l-carboxylate (ZS-2): -73_ To a stirred solution of compound 2S-1 (1.0 g, 2.22 mmol) in CHzClz (15 mL) was added Et3N (0.34 mL, 2.44 mmol) drop wise at 0 °C under inert atmosphere. To this ACZO (0.27 mL, 2.64 mmol) ed by DMAP (50 mg, 0.40 mmol) was added at 0 oC and allowed to stir at RT for 2 h. The reaction mixture was d with water and the aqueous layer was extracted with CHzClz (2 x 25 mL). The combined c extracts were dried over anhydrous Na2S04 and concentrated under reduced pressure to afford compound 2S-2 (0.8 g, 73%) as a liquid. 1H-NMR: (400 MHz, DMSO—dg): 6 7.41—7.34 (m, 5H), 5.26—5.24 (m, 1H), 4.54 (s, 2H), 4.06— 3.97 (m, 1H), .72 (m, 1H), 3.62 (s, 3H), 3.52—3.49 (m, 1H), 2.68 (s, 6H), 2.34—2.31 (m, 1H), 1.87 (s, 3H), 1.78—1.74 (m, 2H), 1.42 (s, 6H), 1.14 (d, 3H).

Mass m/z: 493.8 [M++1] S nthesis 0f tert—But 1 2S 3R acet0x hox -l-0xobutan lcarbamo 1 (hydroxymethyl) pyrrolidine- l-carboxylate 12S-3 2: To a stirred solution of compound 2S-2 (0.8 g, 1.62 mmol) in EtOAc (15 mL) was added 10% Pd—C (0.15 g) and stirred at RT for 24 h under H2 atmosphere (balloon pressure). The reaction mixture was filtered through a celite pad and washed with EtOAc. The filtrate was concentrated under d pressure. The crude nd was purified by silica gel column chromatography eluting with 40% hexane to afford compound 2S-3 (0.5 g, 77%) as a liquid. 1H-NMR: (500 MHz, DMSO—dg): 8 8.16 (br s, 1H), 5.78—5.74 (m, 1H), 5.23 (d, J= 9.5 Hz, 1H), 4.64-4.58 (m, 1H), 4.03—3.98 (m, 1H), 3.61 (s, 3H), 3.52 (d, J= 10.0 Hz, 1H), 3.43 (d, J= 6.5 Hz, 1H), 2.29—2.27 (m, 1H), 1.96-1.94 (m, 4H), 1.74—1.68 (m, 2H), 1.38—1.30 (m, 9H), 1.14 (d, J= 6.5 Hz, 3H); LCMS m/z: 403.6 [M++1] S nthesis of tert-But 1 2S 3R acetox methox oxobutan l-l-oxo-Z 5—diaza spiro|3.4 e-S-carboxylate gZS-FNL-l 2: To a stirred solution of compound 2S-3 (0.35 g, 0.87mmol) in THF (15 mL) was added PPh3 (274 mg, 1.04 mmol) at RT and stirred for 30 minutes under inert atmosphere.

Then the reaction mixture was cooled 0 °C, DTAD (0.22 g, 0.95 mmol) was added to the reaction mixture and allowed to warm to room temperature and stirring was ued for another 20 h. It was quenched with saturated citric acid and washed with saturated NaCl solution and extracted with EtOAc (2 x 20mL). The combined organic extract were dried over anhydrous Na2S04 and concentrated under reduced pressure. The obtained crude material was -74_ purified by silica gel column tography eluting with 40% EtOAc/Hexane to afford NRX- 1076 (ZS-FNL-l) (160 mg, 48%) as a liquid. 1H-NMR: (400 MHz, DMSO—dg): 5 5.21—5.18 (m, 1H), 4.57 (d, 1H), 3.82 (d, 1H), 3.64 (d, 3H), 3.42 (d, 2H), 3.24—3.21 (m, 1H), 2.14—2.11 (m, 2H), 1.97 (s, 3H), 1.84-1.78 (m, 2H), 1.37 (s, 9H), 1.18 (d, 3H); Mass m/z: 383.1 [M—l] Scheme 2S-2: WgzOI-I NH2 1'3000 Step1 Step 2 NH2 Step 3 NH4Cl 5%“!ES: [28"Ogjcm iso butyryl {I}?NW“§:'OH EDCI chloride 0:370 ZS—L 28—FNL—2 28—FNL—3 28—FNL—5 Step 4 I zs_x2 MN0,;---OH dN o 28—FNL—5 S nthesis 0f tert—but 12- 2S 3R amino-3—h drox butan l 0X0-2 5- diazas iro 3.4 octane-S-carbox late 2S-FNL-2 : ] To a stirring solution of compound 2S-L (500 mg, 1.52 mmol) in CH2C12 (5 mL) were added DIPEA (0.8 mL, 4.57 mmol), EDCI.HC1 (350 mg, 1.82 mmol) followed by HOBt (280 mg, 1.82 mmol), NH4Cl (161 mg, 3.04 mmol) at 0 OC and stirred for 16 h at RT. After consumption of the starting material (by TLC), the reaction e was diluted with water (10 mL) and extracted with CH2C12 (2 x 30 mL). The combined organic layer was washed with citric acid solution (2 x 30 mL). The organic layer was dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. ed crude material was purified by silica gel column chromatography eluting 2% MeOH/DCM to afford compound (ZS-FNL-Z) (200 mg, 40%) as colorless liquid. 1H-NMR: (500 MHz, DMSO—dg): 5 7.53 (s, 2H), 4.59 (s, 1H), 4.02 (s, 1H), 3.77—3.70 (m, 2H), .53 (m, 2H), 3.46-3.33 (m, 1H), .03 (m, 2H), 1.88-1.71 (m, 2H), 1.38 (s, 9H), 1.18 (d, J: 6.5 Hz, 3H); Mass (ESI): 328.3 [M++1] S nthesis of 2S 3R h drox l-oxo-Z 5—diazas iro 3.4 octan-Z- l butanamide 2S- FNL-3): To a stirring on of compound (ZS-FNL-Z) (200 mg, 0.61 mmol) in CHzClz (5 mL) was added TFA (0.5 mL, 6.1 mmol) at 0 °C and stirred at RT for 3 h. After completion of reaction (by TLC), the reaction mixture was concentrated under reduced pressure to obtained crude nd which was triturated with n—pentane/diethylether (5 mL/5 mL) to afford compound (2S-FNL-3) (100 mg) as white solid (TFA salt). : (400 MHz, D20): 5 4.33-4.29 (m, 2H), 4.09 (d, 1H), 3.95 (d, 1H), 3.57—3.48 (m, 2H), 2.51-2.46 (m, 2H), 2.25-2.19 (m, 2H), 1.31 (d, 3H); LCMS, m/z: 455 [2M++1] S nthesis of 2S 3R h drox 5-isobut r l-l-oxo-Z 5-diazas iro 3.4 octan-Z- l butanamide 12S-FNL-4 ): To a stirring on of (2S-FNL-3) (500 mg ), 2.20 mmol) in CHZCIZ (10 mL) was added TEA (1 mL, 7.70 mmol) followed by SM3 (256 mg, 2.42 mmol) at 0 OC and stirred for 16 h at RT. After consumption of the ng material (by TLC), the reaction mixture was diluted with water (10 mL) and extracted with CHzClz (2 x 30 mL). The combined organic layer was washed with citric acid solution (2 x 30 mL). The organic layer was dried over anhydrous Na2S04, ed and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting 2% MeOH/DCM to afford (ZS-FNL-4) (100 mg, 15.2%) as white solid. 1H-NMR: (500 MHz, D20): 5 .52 (m, 1H), 4.41-4.37 (m, 1H), 4.27 (d, J= 3.6 Hz, 1H ), 4.04 (t, J: 6.5 Hz, 1H), 3.85—3.72 (m, 1H), 3.71—3.66 (m, 1H), 2.92-2.87 (m, 1H), 2.38—2.27 (m, 2H), 2.12—2.05 (m, 2H), 1.30 (d, J= 6.5 Hz, 3H), 1.14 (d, J= 6.5 Hz, 6H); Mass (ESI): 298.3 [M++l] S nthesis of 2S 3R 5— 1-benz l-S-meth l-1H-1 2 3-triazole-4—carbon lox0—2 5- diazas iro 3.4 octan-Z- lh drox butanamide 2S-FNL-5 : To a stirring solution of 2S-X2 (200 mg, 0.92 mmol) in CHZCIZ (10 mL), DMF (0.1 mL) were added oxalyl chloride (0.16 mL, 1.84 mmol) at 0 OC. The reaction mixture was warmed to RT and stirred for 2 h. The volatiles were evaporated under reduced pressure in presence ofN2 atmosphere to afford acid de (300 mg, crude). To a stirred solution of acid chloride (300 mg, crude) in DCM (5 mL) was added (2S-FNL-3) (220 mg, 0.92 mmol), N, N- -76_ diisopropylethylamine (0.53 mL, 2.76 mmol) at 0 °C. The resulting reaction mixture was stirred at RT for 1 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (10 mL) and extracted with CHzClz (2 x 20 mL). Combined organic ts were washed by brine solution (2 x 10 mL) and dried over anhydrous Na2S04 trated under reduced re to obtain crude product, which was purified by silica gel column chromatography eluting with 3% MeOH/CHZCIZ to afford compound (2S—FNL-5) (200 mg, 48.6%) as pale brown solid. 1H-NMR: (500 MHz, DMSO—ds): 5 7.77 (s, 2H), 7.38-7.31 (m, 3H), 7.18 (d, J= 7.5 Hz, 2H), .65 (s, 2H), 4.89 (d, J= 5.5 Hz, 1H), 4.76 (d, J= 4.0 Hz, 1H), 4.07-3.91 (m, 4H), .48 (m, 1H), 2.39 (s, 3H), 2.26—2.12 (m, 2H), 1.98—1.91 (m, 2H), 1.13 (d, J= 6.5 Hz, 3H); LCMS m/z: 427.6 [M++1]; HPLC: 95.5% (both enantiomers) Scheme 2S-2: HOOBn HOBnO HOH 0 Step— 1 Step——2 N,“ Step—3 N, OCH3 —> N OCH3 OCH3 Thr(OMe) EDCI B000 l O Pd/C H2 2:0H "'0 BOO "OAc "OAc %N:OCH3;Step--5 O Step-4 N Step——6 NH: MeOH.NH3 DTAD, PPh3 Boo‘ (fiNO m” Boo {:1 NH2 .HCIO ZS-FNL—6 28—FNL—7 S nthesis oftert-but 12- benz lox meth 1 2S 3R h drox methox oxobutan-Z- lcarbamo l rrolidine—l-carbox late 2S-4 : To a stirring solution of nd 2S-H (50 g, 0.15 mol) in CHzClz (500 mL) was added methyl 2-aminohydroxybutanoate (23.8 g, 0.18 mol), EDCIHCI (34.2 g, 0.18 mol) followed by HOBt (24.1 g, 0.18 mol) and DIPEA (57.8 g, 0.45 mol) at RT and stirred for 2 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (250 mL) and extracted with CHZCIZ (2 x 250 mL). The separated organic layers were washed with water, brine, dried over anhydrous NaZSO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography g with 50% Hexane to afford nd 2S-4 (53 g, 78.9%) as light green liquid. -77_ To a stirring solution of compound 2S-4 (15 g, 33.3 mmol) in CHgClz (150 mL) was added DIPEA (6.4 g, 49.9 mmol) followed by acetic ide (4 g, 39.9 mmol) and DMAP (408 mg, 3.33 mmol) at RT and d for 2 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (100 mL) and extracted with CHgClz (2 x 100 mL). The separated organic layer was washed with brine, dried over anhydrous NaZSO4, filtered and concentrated under reduced pressure to afford compound 2S-5 (16 g, crude) as light brown liquid. 1H-NMR: (400 MHZ, CDC13): 5 7.35 (d, 5H), 5.47—5.44 (m, 1H), 4.80 (dd, 1H), 4.64—4.61 (m, 2H), 4.15-4.11 (m, 1H), 3.86-3.83 (m, 1H), 3.75 (s, 4H), 3.54-3.50 (m, 2H), 2.42-3.38 (m, 1H), 1.91—1.85 (m, 5H), 1.45—1.41 (m, 10H), 1.27 (d, 2H); LCMS (ESI): 492 [M+] S nthesis of ut l 2- 2S 3R acet0x h0x 0xobutan lcarbamo 1 1hydroxymethyl{pyrrolidine-l-carboxylate (ZS-62: To a stirring solution of compound 2S-5 (16 g, 32.5 mmol) in methanol (100 mL) and EtOAc (100 mL) was added 10% Pd on Charcoal (3 g) at RT and stirred for 4 h under H2 atmosphere (balloon pressure). After consumption of the starting material (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with methanol.

Obtained te was concentrated under reduced pressure to afford compound 2S-6 (10 g, crude) as brown thick syrup. This material was directly used for the next step without further purification.

S nthesis of Z -tert—but l 2- l-methox buten l-l-oxo-Z 5-diazas iro 3.4 octane-S-carboxylate :

[00193] To a stirring solution of compound 2S-6 (10 g, 24.8 mmol) in THF (50 mL) was added triphenylphosphine (13 g, 49.7 mmol) and DTAD (11.15 g, 37.3 mmol). The reaction e was stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction was concentrated under d re. The crude material was purified by silica gel column chromatography eluting with 40% EtOAc/hexane to afford compound 2S-7 (2 g, 24.8%).

S nthesis of tert—but 12- 1 3—diamin0-l-0xobutan l-l-oxo-Z 5-diazas iro 3.4 octane- oxylate gZS-FNL-6 2: .73_ A solution of compound 28-7 (2 g, 6.16 mmol) in methanolc.NH3 (50 mL) was stirred at RT for 4 h. After consumption of the starting material (by TLC), the reaction mixture was concentrated under reduced pressure. ed crude material was washed with EtZO (25 mL) and n—pentane (25 mL) to afford (ZS-FNL-6) (0.35 g, 16.6%) as white solid. 1H—NMR: (500 MHz, DMSO-dg): 5 7.70 (br s, 1H), 7.07 (s, 1H), 3.85 (d, 1H), 3.73 (d, 1H), .38 (m, 2H), 3.29-3.25 (m, 1H), 3.12—3.07 (m, 1H), 2.09 (t, 2H), 1.95 (br s, 1H), 1.84— 1.81 (m, 2H), 1.93 (s, 9H), 1.12 (d, 1H), 0.99 (d, 2H); LCMS (ESI) m/z: 327.3 [M++1] S nthesis 0f 3-amin0 l-oxo-Z 5-diazas iro 3.4 octan-Z- l butanamide ZS-FNL-7 :

[00195] To a ng solution of (ZS-FNL-6) (0.25 g, 0.76 mmol) in CHzClz (10 mL) was added ether.HCl (5 mL) at RT and d for 4 h. To this was added 1, ane-HC1 (5 mL) and stirring was continued for 2 h. After consumption of starting material (by TLC), the solvent from the reaction was d under reduced pressure and obtained crude material was washed with ACN (25 mL) and EtZO (25 mL) to afford (ZS-FNL-7) (0.11 g, 63.5%) as an off- white solid. 1H-NMR: (400 MHz, D20): 5 4.69—4.55 (m, 1H), 4.12—3.86 (m, 3H), 3.62—3.51 (m, 2H), 2.56— 2.23 (m, 2H), 2.25—2.21 (m, 2H), .43 (m, 3H).

LCMS (ESI) m/z: 227.2 [M++1]; UPLC (Purity): 97.96% SchemeZS—3: 0t??? 0 Step 1 NHJ\ In ). Step 2 NH\)\ NI- NI“ —> m).I- BocO BocO O 28-L 28-8 28-FNL-8 5-diazas iro 3.4 octane-S-carbox late 28-8: To a stirring solution of compound 2S-L (300 mg, 0.91 mmol) in CH2C12 (10 mL) were added DIPEA (354 mg, 2.74 mmol), EDCI.HC1 (210 mg, 1.09 mmol) followed by HOBt (165 mg, 1.09 mmol), isobutylamine (80 mg, 1.09 mmol) at 0 °C and stirred for 16 h at RT. After consumption of the ng material (by TLC), the reaction mixture was diluted with water (10 mL) and extracted with CHzClz (2 x 30 mL). The combined organic layer was -79_ washed with brine (2 x 30 mL), dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. ed crude al was purified by silica gel column chromatography g 2% MeOH/DCM to afford compound ZS-8 (250 mg, 71.5 %) as white solid. 1H-NMR: (400 MHz, DMSO-dg): 5 8.02 (t, J: 5.2 Hz, 1H), 4.37 (s, 2H), 4.04 (t, J= 5.6 Hz, 1H), 4.00 (d, J= 5.6 Hz, 1H), 3.77-3.72 (m, 1H), 3.61 (d, J: 6.0 Hz, 1H), 3.44—3.38 (m,1H), 2.98-2.84 (m, 3H), 2.19—2.08 (m, 3H), 1.84—1.79 (m, 1H), 1.42 (s, 9H), 1.39 (d, J: 5.5 Hz, 3H), 0.84 (d, J: 6.4 Hz, 6H); Mass (ESI): m/z 384.4 [M++1] S nthesis of 2S 3R h drox but 1 l-oxo-Z 5—diazas iro 3.4 octan-Z- l butanamide gZS-FNL-S): To a ng solution of compound 2S-8 (250 mg, 0.65 mmol) in CH2C12 (5 mL) was added TFA (0.6 mL, 6.52 mmol) at 0 °C and stirred at RT for 3 h. After completion of reaction (by TLC), the reaction mixture was trated under reduced pressure to obtained crude compound which was triturated with n-pentane/diethylether (3 x 5 mL) to afford (2S- FNL-8) (125 mg, 67.9 %) as an white solid (TFA salt). 1H-NMR: (500 MHz, D20): 5 4.26 (s, 2H), 4.09 (t, J: 8.0 Hz, 1H), 3.95 (t, J: 7.5 Hz, 1H), 3.56-3.51 (m, 2H), 3.14—3.06 (m, 2H), 2.50—2.43 (m, 2H), 2.25-2.21 (m, 2H), 1.85—1.82 (m, 1H), 1.30 (d, J: 5.5 Hz, 3H), 0.96 (d, J: 7.0 Hz, 6H); Mass (ESI): m/z 284.3 [M++1] Scheme 2S-4: 0 -33 0 0“ NH N“ Step 1 Step 2 J3 N' " N' " 1:1 -nOH cyclobutyl N «OH 3000 amine BocO H ZS-L 28—FNL-9 S nthesis 0f ut 12- 2S 3R c clobu lmeth 1 amino h drox 0X0butan loxo-2 5—diazas iro 3.4 octane-S-carbox late 2S-9: To a stirring solution of compound 2S-L (500 mg, 1.52 mmol) in CHZClz (10 mL) were added DIPEA (0.8 mL, 4.57 mmol), EDCIHCl (350 mg, 1.82 mmol) followed by HOBt (280 mg, 1.82 mmol), cyclobutylamine (155 mg, 1.82 mmol) at 0 OC and stirred for 16 h at RT. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (10 mL) and the separated organic layer was washed with citric acid (2 x 20 mL), -80— brine (2 x 20 mL). The combined organic layers were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting 80% EtOAc/n—hexane to afford nd 2S-9 (250 mg, 41.5 %) as colorless syrup. 1H-NMR: (500 MHz, DMSO—dg): 5 8.20 (t, J: 11.5 Hz, 1H), 4.53 (s, 2H), 4.03 (t, J: 7.5 Hz, 1H), 3.88 (t, J: 8.5 Hz, 2H), .33 (m, 2H), 3.32-3.24 (m, 2H), 2.41—2.33 (m, 3H), 2.32— 2.27 (m, 2H), 2.24—2.17 (m, 2H), 2.10—1.90 (m, 2H), 1.68 (t, J: 8.5 Hz, 2H), 1.40 (s, 9H), 1.18 (d, J: 6.4 Hz, 3H); Mass (ESI): m/z 396.4 [M++l] S nthesis of 2S 3R -N— c clobu lmeth l h drox l-oxo-Z as iro 3.4 octan- 2-yl) mide (ZS-FNL-91: To a stirring solution of compound 2S-9 (250 mg, 0.63 mmol) in CHzClz (5 mL) was added TFA (0.5 mL, 5.06 mmol) at 0 °C and stirred at RT for 3 h. After completion of reaction (by TLC), the reaction mixture was concentrated under reduced pressure to obtained crude nd which was triturated with diethylether (5 mL) to afford (2S-FNL-9) (90 mg, 48.3%) as hygroscopic white solid (TFA salt). 1H-NMR: (500 MHz,DZO): 5 4.23 (s, 2H), 4.08 (t, J= 7.0 Hz, 1H), 3.94 (t, J= 8.5 Hz, 1H), 3.56—3.51 (m, 2H), 3.32—3.24 (m, 2H), 2.56—2.53 (m, 3H), .43 (m, 2H), 2.25—2.21 (m, 2H), 2.07-1.88 (m, 2H), 1.71 (t, J= 8.5 Hz, 2H), 1.28 (d, J= 6.4 Hz, 3H); Mass (ESI): m/z 296.3 [M++1]; Scheme 2S-5: O O O m Step 1 NH NH Step 2 NI I - —> NI .. <:> _> Q?NI .. ...0H BnNHz m --IOH TFA -I|OHLC) ’ H Boc o Boc o o .TFA ZS-L 23-FNL-10 ZS-FNL-11 Step4 l isobutyryl chloride 0 0 NH NH &, N... N...

AcCI 3: "'OHLC} N «OH\_© O 00 ZS-FNL-12 ZS-FNL-13 -81— S nthesis of tert-but l 2- 2S 3R benz lamino h drox 0x0butan l0x0-2 -diazaspir0 |3.4| octane-S-carboxylate [2S-FNL-10]: To a stirring solution of compound 2S—L (1 g, 3.04 mmol) in CHgClz (15 mL) were added DIPEA (1.6 mL, 9.14 mmol), EDCI.HCl (700 mg, 3.66 mmol) followed by HOBT (560 mg, 3.66 mmol), benzylamine (325 mg, 3.04 mmol) at 0 °C and stirred for 16 h at RT.

After consumption of the starting material (by TLC), the reaction mixture was diluted with water (20 mL) and extracted with CH2C12 (2 x 30 mL). The combined organic layer was washed with citric acid solution (2 x 30 mL) and organic layer was dried over anhydrous NaQSO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting 5% MeOH/DCM to afford (2S-FNL—10) (800 mg, 63.5 %) as white solid. : (400 MHz, CD30D): 5 7.38—7.20 (m, 5H), 4.62—4.60 (m, 1H), 4.49—4.43 (m, 2H), 4.33-4.25 (m, 1H), 4.04 (d, J= 5.6 Hz, 1H), 3.96-3.92 (m, 1H), 3.51-3.45 (m, 1H), .31 (m, 1H), .21 (m, 2H), 1.98—1.86 (m, 2H), 1.39 (s, 9H), .22 (m, 3H); Mass (ESI): m/z 418.4 [M++l]; HPLC:91.8% (both isomers) S s of 2S 3R -N-benz lh drox l-oxo-2 5-diazas iro 3.4 octan l butanamide [2S-FNL-11]: To a ng solution of (2S-FNL—10) (700 mg, 1.67 mmol) in CHzClz (10 mL) was added TFA (1.9 mL, 16.7 mmol) at 0 °C and d at RT for 4 h. After completion of reaction (by TLC), the reaction mixture was trated under reduced pressure to obtained crude nd which was triturated with n-pentane/diethylether (5 mL/5 mL) to afford (2S- FNL-l 1) (400 mg, 75.6 %) as an white solid (TFA salt). 1H-NMR: (400 MHz, D20): 5 .34 (m, 5H), 4.45 (s, 2H), 4.29-4.21 (m, 2H), 4.06—3.85 (m, 2H), 3.52—3.47 (m, 2H), 2.45—2.35 (m, 2H), 2.22—2.16 (m, 2H), 1.24—1.20 (m, 3H); Mass (ESI): m/z 318.4 [M++l]; HPLC: 891% (both isomers).

S nthesis of 2S 3R —2— S—acctvl—l—oxo—Z S—diazas iro hydroxybutanamide [2S-FNL-12 [:

[00202] To a stirring solution of (2S-FNL—11) (240 mg, 0.75 mmol) in CHzClz (10 mL) were added TEA (0.31 mL, 2.25 mmol) at RT. After added acetyl chloride (0.1 mL, 0.9 mmol) slowly at 0 oC and stirred to RT for 2 h. After consumption of the starting material (by TLC), WO 20783 -82— the reaction mixture was diluted with water (5 mL) and extracted with CHZClz (2 x 20 mL).

The combined organic layer was washed with citric acid solution (1 x 20 mL), brine (l x 20 mL). The separated organic layer was dried over anhydrous NazSO4, filtered and concentrated under reduced pressure. ed crude material was d by silica gel column chromatography eluting with 2% MeOH/DCM to afford (2S-FNL-12) (90 mg, 33.4%) as an off-white solid. 1H-NMR: (400 MHz, CD30D): 5 7.32-7.20 (m, 5H), 4.58-4.55 (m, 1H), 4.52—4.42 (m, 2H), 4.36—4.22 (m, 1H), 4.08—3.93 (m, 1H), .65 (m, 2H), 3.64—3.53 (m, 2H), .22 (m, 2H), 2.20 (s, 3H), 2.04—1.95 (m, 2H), .20 (m, 3H); Mass (ESI): m/z 360.3 [M++1]; HPLC:97.5% (both isomers) S nthesis of 2S 3R -N-ben lh drox 5—isobu r l-l-oxo-Z S-diazas iro 3.4 octan-Z-yl! butanamide 1NRX-2563! gZS-FNL-l3 2: To a stirring solution of (ZS-FNL-ll) (244 mg, 0.76 mmol) in CHzClz (10 mL) was added TEA (0.37 mL, 2.66 mmol) at 0 °C. After added Int-F (89 mg, 0.84 mmol) and stirred at RT for 2 h. After completion of reaction (by TLC), the reaction mixture was diluted with water (10 mL) and extracted with CHzClz (2 x 20 mL). The combined organic layer was washed with citric acid on (2 x 30 mL) and c layer was dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting 60% EtOAc/n—hexane to afford (2S- FNL-13) (150 mg, 51 %) as an off—white solid. 1H-NMR: (400 MHz, CD30D): 5 7.35—7.20 (m, 5H), 4.82—4.49 (m, 1H), 4.46—4.31 (m, 1H), 4.29-4.03 (m, 1H), 3.90—3.70 (m, 2H), 3.69—3.57 (m, 2H), 3.46-3.31 (m, 1H), 2.77—2.73 (m, 1H), 2.28—2.21 (m, 2H), 2.06—1.97 (m, 2H), 1.22 (d, J: 6.8 Hz, 3H), 1.08—0.98 (m, 6H); Mass (ESI): m/z 388.4 [M++l]; HPLC: 95.2% (both isomers) 2014/013619 -83_ Scheme 2S-6: OH E0}? §:0H—>ZS-Q, HATU g;Step1 NH Boc 0 B00 0 ZS-L 28-FNL-14 S nthesis 0f ut 12- 2S 3R 1 2 4—0xadiazol—5- oxobutan-Z- l-l-oxo-Z 5-diazas iro 3.4 octane-S-carbox late -14: To a stirring solution of compound 2S-L (600 mg, 1.82 mmol) in DMF (10 mL) were added DIPEA (708 mg, 5.48 mmol), ZS-Q (290 mg, 1.82 mmol) HATU (761 mg, 2.00 mmol) at 0 °C and stirred for 16 h at RT. After consumption of the ng material (by TLC), the reaction mixture was diluted with water (50 mL) and EtOAc (100 mL). The organic layer was washed with water (2 x 50 mL) followed by brine solution (2 X 30 mL). The organic layer was dried over anhydrous NaZSO4, filtered and concentrated under reduced re. Obtained crude material was purified by silica gel column chromatography eluting 2% MeOH/DCM. The obtained solid was triturated with ether/n-pentane (5 mL/5 mL) to afford (2S-FNL-14) (100 mg, 13.5 %) as white solid. 1H-NMR: (400 MHz, CD30D): 5 8.61 (s, 1H), 4.85 (s, 2H), 4.78—4.63 (m, 1H), 4.59—4.55 (m, 1H), 4.30—4.25 (m, 1H), 3.52—3.46 (m, 2H), 3.43—3.29 (m, 1H), 2.31—2.23 (m, 2H), 1.96-1.88 (m, 2H), 1.45 (s, 9H), 1.26—1.20 (m, 3H); Mass (ESI): m/z 410.4 [M++1]; HPLC:98. 14% (both isomers) Scheme 2S- 7: o ,N OH N1) Step1 NH N‘ 0 \> Step-2 N“. NH\)\O N NI:- "IOH 28-UBOP TFA 13000 N BocO “CH ,Tfl O ZS-L 28-FNL-15 28-FNL-16 To a stirring solution of compound 2S—L (1 g, 3.04 mmol) in DMF (10 mL) were added DIPEA (1.58 mL, 9.12 mmol), BOP reagent (2.01 g, 4.56 mmol) followed by 2S-U (496 mg, 3.64 mmol) at 0 °C and stirred for 16 h at RT. After consumption of the starting .84_ material (by TLC), the reaction mixture was diluted with water (100 mL) and extracted with EtOAc (2 x 30 mL). The combined organic layer was washed with brine solution (2 x 50 mL) and organic layer was dried over anhydrous Na2S04, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting 80% EtOAc/n-hexane followed by preparative HPLC purification to afford (2S-FNL-15) (67 mg, 5.4 %) as an off-white solid. : (400 MHz, DMSO—d6): 6 10.92 (s, 1H), 7.83 (s, 1H), 4.97—4.88 (m, 2H), 4.07 (d, J= 7.2 Hz, 2H), 3.83—3.65 (m, 2H), 3.57—3.40 (m, 1H), .25 (m, 2H), .01 (m, 2H), 1.83— 1.80 (m, 2H), 1.40 (s, 9H), 1.22 (d, J: 6.4 Hz, 3H) Mass (ESI): m/z 410.4 [M++1]; HPLC:90.6% S nthesis of 2S 3R -N- 1 3 4-0xadiazol—2- l meth l h drox 1-0x0—2 5- diazaspiro |3.4| octan-Z-yl) butanamide L-161: To a stirring solution of compound (2S-FNL-15) (70 mg, 0.71 mmol) in CHzClz (5 mL) was added TFA (195 mg, 1.71 mmol) at 0 °C and d at RT for 1 h. After completion of reaction (by TLC), the reaction mixture was concentrated under reduced pressure to obtained crude nd which was triturated with n—pentane/diethylether (5 mL/5 mL) to afford compound (ZS-FNL-l6) (60 mg, 84.5%) as an off—white solid (TFA salt). 1H-NMR: (400 MHz,, D20): 5 7.83 (s, 1H), 5.20-5.10 (m, 1H), 4.80 (s, 1H), 4.39-4.30 (m, 2H), 4.13-4.04 (m, 2H), 3.53—3.48 (m, 2H), 2.44-2.41 (m, 2H), 2.21—2.16 (m, 2H), 1.31 (d, J: 6.4 Hz, 3H); Mass (ESI): m/Z 310.1 [M++1]; HPLC: 90.99% Scheme 2S-8: OBn I§:OBnStep-2 WNIII§OBn Step-3 N "'03” .lOBn AC???“ ..OBn Acetyl A00 Pd-C/H2 BocO Chloride ZS-K 28-10 28-11 OH / Q) NH N N... Step-4 —> NII' N "'OH Int-F, EDCI N ”10H 28-12 28-FNL-17 -35_ S nthesis of hen 1 2S 3R ben 10x l-oxo-Z 5—diazas iro 3.4 octan-Z-l butanoate 18): To a stirring solution of compound 2S-K (800 mg, 1.57 mmol) in DCM (10 mL) was added TFA (1.2 mL) at 0 OC and stirred at RT for 2 h. After consumption of the starting material (by TLC), the reaction mixture was concentrated under reduced pressure to afford compound 2S-10 (500 mg, 78%) as an off—white solid (HCl salt) was used directly for next step. 1H-NMR: (500 MHz, D20): 5 7.48 (m, 5H), 7.24-7.21 (m, 5H), 5.29 (s, 2H), 4.96 (s, 2H), 4.80-4.62 (m, 1H), 4.29-4.18 (m, 2H), 4.01-3.89 (m, 1H), 3.52-3.46 (m, 2H), 2.43-2.38 (m, 2H), 2.24—2.14 (m, 2H), 1.35—1.28 (m, 3H); LCMS: 408 [M++1] jbenzyloxy) butanoate (ZS-11 1: ] To a stirring solution of compound 2S-10 (500 mg, 1.22 mmol) in DCM (5 mL) was added TEA (0.46 mL, 3.36 mmol) followed by acetyl chloride (0.1 mL, 1.47 mmol) at 0 °C and stirred at RT for 2 h. After consumption of the starting material (by TLC), reaction mixture was d with water (10 mL). The organic layer was dried over ous Na2SO4, filtered and concentrated under reduced re. Obtained crude material was purified by silica gel column chromatography eluting 2% MeOH/DCM to afford compound 2S-11 (300 mg, 54.5 %) as white solid. 1H-NMR: (400 MHZ, CD30D): 7.36-7.29 (m, 5H), .16 (m, 5H), 5.13 (s, 2H), 4.59 (s, 2H), 4.32-4.29 (m, 2H), 4.16—4.13 (m, 1H), 3.65—3.61 (m, 1H), 3.60-3.46 (m, 2H), 2.21—2.09 (m, 2H), 2.02 (s, 3H), 2.01—1.91 (m, 2H), 1.21 (d, J: 6.4 Hz, 3H); LCMS: 451.3 [M++1] S nthesis of 2S 3R 5-acet l-l-oxo-Z S-diazas iro 3.4 octan-Z- lh drox butanoic acid 1: To a stirring solution of compound 2S-11 (1 g, 2.22 mmol) in ol (30 mL) was added 10% Pd/C (500 mg) at RT and stirred for 24 h under H2 atmosphere. After consumption of the ng al (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with methanol (20 mL). Obtained filtrate was concentrated under reduced pressure to afford compound 2S—12 (500 mg, 83.3%) as an off—white solid. .86_ 1H-NMR: (400 MHz, CD30D): 5 4.35—4.30 (m, 1H), 4.29—4.17 (m, 1H), 4.09—4.04 (m, 1H), 3.76—3.67 (m, 1H), 3.59—3.48 (m, 1H), 3.34—3.31 (m, 1H), 2.29—2.24 (m, 2H), 2.15 (s, 3H), 2.04— 1.96 (m, 2H), 1.28 (d, J: 6.4 Hz, 3H); LCMS m/z: 270.4 [M++1] S s of 2S 3R 5-acet l-l-oxo-Z 5—diazas iro 3.4 octan-Z- lh drox -N- rimidin-Z- lmeth l butanamide 2S-FNL-17 : ] To a stirring solution of compound 2S-12 (700 mg, 2.59 mmol) in DCM (15 mL) were added DIPEA (1.35 mL, 7.77 mmol), ZS-Y (410 mg, 2.84 mmol), EDCI (593 mg, 3.1 mmol) followed by HOBT (474 mg, 3.1 mmol) at 0 °C and stirred for 16 h at RT. After consumption of the starting al (by TLC), the reaction mixture was diluted with water (40 mL). The organic layer was dried over anhydrous , filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting 3% MeOH/DCM to afford (2S-FNL-17) (100 mg, 10.7 %) as white solid. 1H-NMR: (400 MHz, D20): 5 8.78 (d, J= 5.2 Hz, 2H), 7.49 (t, J= 5.2 Hz, 1H), 4.79 (s, 2H), 4.55-4.47 (m, 1H), 4.40—4.37 (m, 2H), 3.79—3.56 (m, 3H), 2.37-2.26 (m, 2H), 2.14—2.03 (m, 2H), 2.01 (s, 3H), 1.28 (d, J: 6.4 Hz, 3H); Mass (ESI): m/z 362.4 [M++1]; HPLC: 92.3% (both isomers) SchemeZS—9: o o 0 OH NH N— NH N_ Don- —"» Dow- %Ste 1 —"» Dou- H9Ste 2 1“ "'OH 28-Y,EDC| 5“ "'OH N TFA fl "'OH N Boc O Boc O TFAO ZS-L 28—FNL-18 28-FNL-19 NH N_ Step 3 N"' \—<\ :/> E N ---OH N Isobu yryt l chloride 0: O 28-FNL-20 S nthesis 0f tert-bu l 2- 2S 3R h drox n-Z- lmeth 1 amino butan-Z- l-l-oxo-Z 5-diazas iro 3.4 octane-S-carbox late 2S-FNL-18: 2014/013619 .37_ To a stirring solution of compound 2S-L (1 g, 3.04 mmol) in CHzClz (30 mL) were added DIPEA (1.63 mL, 9.14 mmol), EDCI.HC1 (696 mg, 3.64 mmol) ed by HOBT (558 mg, 3.64 mmol), ZS-Y (241 mg, 3.34 mmol) at 0 °C and d for 16 h at RT.

After consumption of the starting material (by TLC), the on mixture was diluted with water (30 mL). The organic layer was washed with citric acid solution (2 x 30 mL) followed by brine solution (2 x 25 mL). The organic layer was dried over anhydrous NaZSO4, filtered and trated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting 5% MeOH/DCM to afford (ZS-FNL-18) (800 mg, 63 %) as white solid. 1H-NMR: (400 MHz, CD3OD): 5 8.72 (t, J= 4.8 Hz, 2H), 7.36 (t, J= 4.8 Hz, 1H), 4.81-4.76 (m, 1H), 4.62—4.49 (m, 1H), 4.34—4.29 (m, 1H), 4.18-4.03 (m, 2H), 3.56 (d, J: 5.6 Hz, 2H), 3.52—3.46 (m, 1H), 2.30—2.25 (m, 2H), .88 (m, 2H), 1.46 (s, 9H), 1.31—1.28 (m, 3H); Mass (ESI): m/z 420.4 [M++1]; HPLC:99.6% (both isomers) S nthesis of 2S 3R ylmethyl) butanamide L-19): To a stirring on of (2S-FNL-18) (280 mg, 0.66 mmol) in CHzClz (5 mL) was added TFA (0.3 mL, 4.0 mmol) at 0 OC and stirred at RT for 4 h. After completion of reaction (by TLC), the reaction mixture was concentrated under reduced pressure to obtained crude compound that was triturated with ane/diethyl ether (5 mL/5 mL) to afford (2S- FNL-19) (95 mg, 44.6 %) as an white solid (TFA salt). 1H-NMR: (500 MHz, D20): 5 8.81 (d, J= 4.5 Hz, 2H), 7.53 (t, J= 5.0 Hz, 1H), 4.80—4.65 (m, 2H), 4.46 (d, J: 6.0 Hz, 1H), 4.36—4.31 (m, 2H), 4.10 (d, J= 7.5 Hz, 1H), 3.95 (t, J= 8.0 Hz, 1H), 3.58—3.49 (m, 1H), 2.51—2.40 (m, 2H), 2.26—2.17 (m, 2H), 1.34 (d, J: 6.0 Hz, 3H); Mass (ESI): m/z 320.3 [M++l] S nthesis of 2S 3R h drox 5-is0but r l-l-oxo-Z 5-diazas iro 3.4 octan-Z- l -N- jpyrimidin-Z-ylmethyl) butanamide gZS-FNL-20 2: To a stirring solution of (2S-FNL-l9) (300 mg, 0.94 mmol) in CHzClz (5 mL) was added TEA (0.4 mL, 2.82 mmol) followed by SM-4 (120 mg, 1.12 mmol) at 0 OC and d at RT for 2 h. After completion of reaction (by TLC), the reaction mixture was diluted with water (10 mL) and extracted with CHzClz (2 x 20 mL). The combined organic layer was dried over anhydrous Na2S04, filtered and concentrated under reduced pressure. Obtained -88_ crude material was purified by silica gel column chromatography eluting 2% CM to afford L-20) (100 mg, 27.3 %) as white solid. : (400 MHz, CD30D): 5 8.73 (t, J: 5.2 Hz, 2H), 7.36 (t, J: 4.8 Hz, 1H), 4.83—4.55 (m, 1H), 4.51—4.29 (m, 3H), 4.21—4.02 (m, 1H), 3.75—3.69 (m, 1H), 3.64—3.60 (m, 1H), 3.31— 3.30 (m, 1H), 2.79-2.72 (m, 1H), 2.28—2.25 (m, 2H), 2.08—1.97 (m, 2H), 1.31 (d, J: 6.4 Hz, 3H), 1.07—1.02 (m, 6H).

Mass (ESI): m/z 390.4 [M++l], HPLC: 97.75% Scheme 2S-I0: OH OHH O OMe 99 3 Step 1 Step 2 N OH NI —> N I. NH: 0M6 —> —> i N HATU l o o Mitsunobu I OTBDPS MeOH.NH3 BOO BoC OTBDPS BocO '” 2S-I 25—13 o o o NH2 Step 4 N_ NH2 Step 5 NH2 —> N‘ 'l —> N-., N N \ NEWS TBAF I H* 0 H OH 800 3000 O 2S-15 2S-16 28-FNL-21 tert—Bu 12- S ut ldi hen lsil 10X methox 0X0 r0 an-Z- lcarbamo 1 h drox meth l rrolidine-l-carbox late 2S-13 : ] To a stirring solution of compound ZS-I (11 g, 44.89 mmol) in CHzClz (110 mL) was added compound 2S-AJ (16.07 g, 44.89 mmol), HATU (20.4 g, 53.68 mmol) followed by DIPEA (17.37 g, 0.13 mol) at RT and stirred for 10 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (100 mL) and extracted with CHzClz (2 x 100 mL). The separated organic layer was washed with brine, dried over anhydrous Na2S04, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography to afford compound 2S-13 (16 g, 61%) as yellow liquid. 1H-NMR: (500 MHz, : 5 7.58—7.37 (m, 10H), 4.67 (s, 1H), 4.12—4.08 (m, 2H), 3.93(s, 1H), 3.75 (s, 3H), 3.72—3.64 (m, 2H), 2.8 (s, 1H), 2.35 (s, 1H), 2.04 (s, 1H), 1.98-1.82 (m, 3H), 1.25 (s, 9H), 1.03 (s, 9H); Mass (ESI): m/z 583.5[M+-1].

S nthesis of tert-bu l 2- tert—but ldi hen lsil 10x meth0x 0x0 ro an-Z- y] )—1-0X0-2,5—diazaspiro|3.4|0ctane-5—carboxylate (ZS-14 1: To a stirring solution of compound 2S-13 (1.6 g, 2.73 mmol) in THF (20 mL) was added triphenylphosphine (0.994 g, 4.10 mmol) and DTAD (0.788 g, 3.00 mmol). The reaction mixture was stirred at RT for 8 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water and extracted with EtOAc (2x 30 mL). The separated organic layer was dried over anhydrous , filtered and concentrated under reduced pressure. The crude material was purified by silica gel column chromatography to afford compound 2S-14 (0.8 g, 51%) as yellow sticky compound. 1H-NMR: (400 MHz, CDC13): 5 7.63—7.58 (m, 4H), 7.45—7.30 (m, 6H), 4.1 (s, 3H), 3.80—3.67 (m, 4H), 3.56-3.44 (m, 3H), 2.04-1.95 (rn, 4H), 1.59 (s, 9H), 1.04 (s, 9H).

Mass (ESI): m/z 567.4 [M++1] S nthesis of u 12- amino ten-but ldi hen lsil lox oxo r0 an-Z- l 0x0-2,5—diazaspiro|3.4|0ctanecarb0xylate {ZS-15 2:

[00216] To a stirring solution of nd 2S-l4 (6 g) in methanol (50 mL) was added methanolic ammonia (50 mL)) at 0°C and stirred for 12 h at RT. After consumption of the starting material (by TLC), the reaction mixture was concentrated under reduced re and purified the crude residue by silica gel column chromatography eluting 40% EtOAc:hexane to afford nd—2S—15 (1 g, 17%) as an pale yellow solid. : (400 MHz, : 5 8.27 (s, 1H), 7.67—7.63 (m, 4H), .36 (m, 7H), 5.37 (s, 1H), 4.56—4.54 (m, 1H), 3.82 (d, .1: 5.2 Hz, 1H), 3.44 (t, .1: 7.6 Hz, 2H), 3.35 (d, .1: 5.2 Hz, 1H), 3.21 (s, 1H), 2.09—2.06 (m, 2H), 2.03 (d, J= 4.8 Hz, 2H), 1.44 (s, 9H), 1.08 (s, 9H).

LCMS (M/Z) m/z: 214 [M++1].

S nthesis oftert-but 12- amin0h drox ox0 ro an-Z- l-l-oxo-Z S-diazas iro |3.4 loctanecarboxylate (ZS-16): To a stirring solution of compound 2S-15 (1g, 1.81 mmol) in THF (10 mL) was added TBAF (0.943 g, 3.62 mmol) at 0°C and the reaction mixture was slowly warmed to RT and stirred for 2 h. After consumption of the starting material (by TLC), the reaction e was diluted with water (5 mL) and extracted with EtOAc (2x 15 mL). The separated organic layer was washed with brine, dried over anhydrous NaZSO4, filtered and trated under reduced pressure. Obtained crude material was purified by silica gel column chromatography by eluting 3% MeOHzDCM to afford 2S-16 (0. 13 g, 23%) as white solid. _9()_ 1H—NMR: (400 MHz, D20): 5 4.53 (t, J: 6.8 Hz, 1H), 4.03 (d, J: 4.8, 1H), 3.96—3.91 (m, 2H), 3.85 (t, J: 5.8 Hz, 1H), 3.82 (s, 2H), 2.30 (t, J: 4Hz, 2H), 2.15-1.82 (m, 2H), 1.49 (s, 9H).

LCMS (M/Z) m/z: 314.2 [M++1] S nthesis of 2S h drox l-oxo-Z 5-diazas iro 3.4 octan-Z- 1 r0 e 2S- FNL-Zl): To a stirring solution of 28-16 (0.13 g, 0.415 mmol) in CHzClz (3 mL) was added TFA (1 mL) at 0 °C and stirred at RT for 2 h. The reaction mixture was concentrated under reduced pressure to afford (ZS-FNL-Zl) (100 mg, crude) as TFA salt. 1H-NMR: (400 MHz, D20): 5 4.58 (t, J: 5.8 Hz, 1H), 4.09—4.03 (m, 3H), 3.92 (d, J: 7.2 Hz, 1H), 3.57-3.52 (m, 2H), 2.55-2.41 (m, 2H), 2.28-2.19 (m, 2H); LCMS (M/Z) m/z: 214[M++1].

Scheme 2S-II: 0 0 DQ§OH &, 8%NH2 N CH N OH BOCO NH4CI, EDCI I BocO 28-AF 28-FNL-22 S nthesis of tert—bu 12- noh drox 0X0 r0 an-Z- l0X0-2 5-diazas iro 3.4 octane-S-carbox late 2S-FNL-22 : To a stirring on of compound 2S—AF (250 mg, 0.79 mmol) in DCM (10 mL) were added DIPEA (0.5 mL, 2.38 mmol), EDCI (181 mg, 0.94 mmol), HOBT (127 mg, 0.94 mmol) followed by NH4Cl (84.5 mg, 1.58 mmol) at 0 °C and stirred to RT for 12 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (20 mL) and washed with citric acid (1 x 30 mL) followed by brine solution (1 x 30 mL). The organic layer was dried over anhydrous Na2S04, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography g with 5% MeOH/DCM to afford (2S-FNL-22) (150 mg, 60.7%) as yellow thick syrup. 1H-NMR: (400 MHz, CD30D): 5 4.13—4.07 (m, 2H), 3.96—3.88 (m, 1H), 3.87—3.77 (m, 1H), .47 (m, 2H), 3.44—3.30 (m, 1H), 2.31—2.26 (m, 2H), 1.97—1.88 (m, 2H), 1.47 (s, 9H); LCMS (ESI): m/z 314.3 [M*+1], HPLC: 98.3 8% Scheme 28—12: _ 91 _ m{OH Step 1 NI I- ZS-YEDCI WN- “QENHVWStep 2N —> OH 0H N _\> %W§:H/OH N_N\> Iiioc 0 B000 28-FNL-23 23-AF 28-FNL-24 Step3 ' NI? NHVN/ N OH \ isobutyryl N chloride 0 2- l-l-oxo-Z 5-diazas iro 3.4 octane-S-carbox late -23: To a ng solution of compound 2S-AF (1.3 g, 4.14 mmol) in DCM (25 mL) were added DIPEA (2.15 mL, 12.42 mmol), HOBT (760 mg, 4.96 mmol), EDCI ( 1 g, 4.96 mmol) ed by 2S-Y (715 mg, 4.96 mmol) at 0 °C and stirred for 16 h at RT. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (50 mL). The organic layer was washed with citric acid (1 x 30 mL) followed by bicarbonate solution (1 x 30 mL). The organic layer was dried over anhydrous NagsO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting with 2% MeOH/DCM to afford (2S-FNL-23) (800 mg, 50%) as white solid. : (400 MHz, CD30D): 5 8.75—8.71 (m, 2H), 7.37—7.34 (m, 1H), 4.66—4.49 (m, 2H), 4.27—4.24 (m, 1H), 4.19—4.14 (m, 1H), 4.03—3.99 (m, 1H), 3.97—3.92 (m, 1H), 3.66—3.54 (m, 1H), 3.49-3.45 (m, 1H), 3.40—3.36 (m, 1H), .27 (m, 2H), 1.97—1.88 (m, 2H), 1.47 (s, 9H); Mass (ESI): m/z 406.4 [M++1].

HPLC:97.1% S nthesis of 2 h drox Z 5-diazas iro 3.4 octan-Z- l -N- rimidin-Z- ylmethyl) propanamide 12S—FNL-24): To a ng solution of compound (2S-FNL-23) (350 mg, 0.86 mmol) in DCM (5 mL) was added TFA (985 mg, 0.86 mmol) at 0 °C and stirred to RT for 3 h. The reaction mixture was brought to RT and concentrated under vacuum to afford (2S-FNL-24) (250 mg, 95.4%) as white solid. -92_ 1H-NMR: (400 MHz, D20): 5 8.84 (d, J: 5.2 Hz, 2H), 7.55 (t, J: 4.8 Hz, 1H), 4.90—4.67 (m, 3H), 4.10—4.06 (m, 3H), 3.94—3.92 (m, 1H), .51 (m, 2H), 2.54—2.43 (m, 2H), 2.28-2.19 (m, 2H); LCMS: m/z 306.4 [M++1]; HPLC: 90.07%.

S nthesis 0f 2 h drox 5—isobut r 0-2 5-diazas iro 3.4 octan l-N— rimidin lmeth 1 r0 anamide 2S-FNL-25 : To a stirring solution of compound (2S-FNL-24) (500 mg, 1.63 mmol) in DCM (5 mL) was added TEA (0.7 mL, 4.91 mmol) at 0 °C. After added Int-F (207 mg, 1.95 mmol) slowly and d to RT for 3 h. After consumption of the starting material (by TLC), the reaction e was diluted with water (20 mL). The organic layer was washed with citric acid (1 x 30 mL) followed by brine solution (1 x 30 mL). The organic layer was dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting with 5% MeOH/DCM to afford (2S- FNL-25) (100 mg, 16.3%) as white solid. 1H-NMR: (400 MHz, CD30D): 5 8.73 (t, J= 4.8 Hz, 2H), 7.37 (d, J= 5.2 Hz, 1H), 4.56—4.51 (m, 2H), 4.32-4.29 (m, 1H), .12 (m, 1H), 4.05—3.98 (m, 2H), 3.74-3.68 (m, 1H), 3.63- 3.58 (m, 1H), .51 (m, 1H), 2.77-2.69 (m, 1H), 2.31—2.26 (m, 2H), 2.08—1.95 (m, 2H), 1.05-0.98 (m, 6H); LCMS: m/z 376.4 ; HPLC: 89.6% (both isomers) Scheme 2S-I3 : Step 1 Step 2 Step 3 Boc/figjn /NO N1...

EDCIHOBt 300/“10qu pd..c/H2 Boc Mitsunobu WNWO Condition BO! 0 'OA0 23—BK OAC OAC ZS-H 23—17 ZS- 18 23—19 Step 6 ‘0Dioxane. HCI Step 4 EWING TWMOStep 5 5);.., N3 AqNH3 ”QOH ”GHQ ’OAc ZS-20 28—FNL26 ZS-FNL-27 S nthesis 0f tert—but 12- 2S 3R -3—acetox ox0 rrolidin-l- l 2— llcarbamoyl {-21 g benzyloxy )methylmyrrolidine-l-carboxylate (ZS-171: To a stirring solution of nd 2S-BK (1 g, 2.90 mmol) in DMF (8 mL) was added EDCIHCI (0.63 g, 3.28 mmol) followed by HOBt (0.44 g, 3.28 mmol) at 0 °C. After being stirred for 5 min, DIPEA (1.3 mL, 7.46 mmol) followed by compound 2S—H (0.74 g, 3.58 mmol) was added to the reaction mixture and stirring was continued for another 16 h at RT.

The reaction mixture was washed with water and extracted with EtOAc (2x 500 mL). The organic layer was washed with brine, dried over ous NaZSO4 and concentrated under vacuum. The crude was purified by column tography to afford nd 2S-17 (0.6 g, 38%). 1H-NMR: (400 MHz, CDC13) (Rotamers): 57.34 (s, 5H), 5.37-5.34 (m, 1H), 4.84-4.80 (m, 1H), 4.72-4.65 (m, 2H), 4.09-4.02 (m, 1H), 3.91-3.87 (m, 1H), 3.65-3.61 (m, 3H), 3.52-3.46 (m, 3H), 2.41 (br s, 1H), 2.22-2.15 (m, 1H), 1.98 (d, 5H), .84 (m, 4H), 1.50-1.42 (m, 9H).

LCMS m/z: 532 [M++1].

S 'nthesis of tart-but 12- 2S 3R acetox 0xo rrolidin-l- '1 butan-Z- To a stirring solution of compound 2S-l7 (4.5 g, 8.40 mmol) in MeOH (40 mL) was added wet 10% Pd/C (1.5 g) under inert atmosphere and stirred for 4 h under H2 atmosphere (balloon re). The reaction mixture was filtered through celite pad and concentrated under reduced pressure to afford nd 2S-18 (3.0 g, 81%).

LCMS m/z: 442.5 [M++1].

S nthesis of tert-bu l 2— 2S 3R acet0x ox0 rrolidin-l- lbutan l-l-oxo- 2,5—diazaspirol3.4 |0ctanecarb0xylate 12S-191: To a stirring on of compound 2S-18 (3 g, 6.70 mmol) in THF (25 mL) was added triphenylphosphine (2 g, 7.40 mmol) followed by DTAD (2.5 g, 10.2 mmol). The reaction mixture was d at RT for 16 h. After consumption of the starting material (by TLC), the reaction was concentrated under reduced pressure. The crude material was purified by silica gel column chromatography eluting with10% MeOH/CH2C12 to afford compound 2S- 19 (1.2 g with TPPO, 43%). 1H-NMR: (400 MHz, DMSO-d6): 5 5.25—5.19 (m, 1H), 4.65 (d, 1H), 3.61-3.57 (m, 3H), 3.47— 3.42 (m, 2H), 3.41-3.25 (m, 4H), 2.05 (s, 4H), 1.95-1.71 (m, 7H), 1.42 (s, 10H).

LCMS m/z: 424.4 [M++1].

S nthesis 0f ut 12- 2S 3R h drox 0xo—1- rrolidin-l- l butan l-l-oxo- 2: 5-diazaspir0 |3.4| octane-S-carboxylate [ZS-20]: A solution of compound 2S-19 (0.15 g, 0.41 mmol) in aqueous NH3 (2 mL) was stirred at RT for 4 h. After consumption of the starting material (by TLC), the reaction diluted with CHzClz (75 mL). The separated organic layer was dried over ous Na2S04 and concentrated under reduced pressure to afford compound 2S-20 (0.1 g, 76%).

LCMS m/z: 382 [M*+1] .

S nthesis of 2- 2S 3R h drox -l-ox0 rrolidin-l- l butan l -2 5 diazas iro 3.4 l-one. [2S-FNL-26]:

[00227] To a stirring solution of compound 2S-20 (0.2 g, 0.63 mmol) in CHzClz (2 mL) was added TFA (0.3 mL) at 0 °C and stirred at RT for 1 h. The reaction mixture was concentrated under vacuum. Obtained residue was diluted with water and extracted with CH2C12 (2x 25 mL). The separated organic layer was dried over anhydrous NaZSO4, filtered and concentrated under vacuum to afford (2S-FNL—26) (0.2 g, 80%) as TFA salt. 1H-NMR: (400 MHz, D20): 5 4.64 (t, 1H), 4.25—4.21 (m, 1H), 4.09 (d, 1H), 3.99-3.87 (m, 1H), 3.70 (t, 2H), .47 (m, 5H), 2.52—2.34 (m, 2H), 2.25—2.22 (m, 2H), 2.08—1.98 (m, 5H), 1.25 (t, 3H).

LCMS (ESI) m/z: 282.4 [M++1].

S nthesis 0f 2R 3 0x0 1-0x0-2 5-diazas iro 3.4 0ctan l rrolidin-l- l butan l e 2S-FNL—27 : A stirring solution of compound 2S-19 (0.4 g, 0.94 mmol) in 1,4-dioxane/HC1 (5 mL) was cooled to 0 °C and stirred at RT for 1 h. After ption of the starting material (by TLC), the reaction mixture was concentrated under reduced re. Obtained crude material was washed with n-pentane followed by EtOAc to afford (2S-FNL-27) (0.22 g, 65%). 1H-NMR: (400 MHz, D20): 5 4.62 (d, 1H), .29 (m, 2H), 4.24 (d, 1H), 3.89—3.77 (m, 3H), 3.54—3.49 (m, 3H), 2.57-2.52 (m, 1H), 2.49 (s, 3H), 2.42—2.00 (m, 8H), 1.30 (d, 3H).

LCMS m/z: 324.3 [M++1].

HPLC Purity: 99.37%.

Scheme 2S-I4: _ 95 _ Nlllll' Step1 Step 2 T "'OH EDCI NH4C| BOC BOCO O 28-AQ 23-21 23-FNL-28 S nthesis 0f tert-but l 2— 2S 3R amin0h drox ox0butan th l-l-oxo- 2 as iro 3.4 octane-S-carbox late 2S-21 : To a stirring solution of nd 2S-AQ (480mg, 1.40 mmol) in CHzClz (15 mL) were added DIPEA (543 mg, 4.20 mmol), EDCI.HC1 (382 mg, 2.0 mmol) followed by HOBt (280 mg, 2.0 mmol), NH4C1 (111mg, 2.0 mmol) at 0 °C and stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (20 mL) and extracted with CH2C12 (2 x 30 mL). The combined organic layer was washed with brine (2 x 50 mL), dried over anhydrous NaZSO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting 2% MeOH/DCM to afford compound 2S-21 (150mg, 31%) as colorless thick syrup. 1H-NMR: (500 MHz, DMSO-d6): 5500—488 (m, 1H), 4.05—3.94 (m, 4H), 3.37 (t, J= 10.5 Hz, 2H), 2.10-1.93 (m, 4H), 1.45 (s, 9H), 1.39-1.27 (m, 1H), .16 (m, 6H); Mass (ESI): m/z364.3 [M++Na] S nthesis of 2S 3R h drox l-meth l0x0-2 5-diazas iro 3.4 0ctan l butanamide L-28): To a stirring solution of compound 28-21 (150 mg, 0.43 mmol) in CHZClz (5 mL) was added TFA (0.4 mL, 4.39 mmol) at 0 °C and stirred at RT for 2 h. After completion of reaction (by TLC), the reaction mixture was concentrated under reduced re to obtained crude compound which was triturated with diethylether/n—pentane (5 mL/5 mL) to afford (ZS- ) (100 mg, 65.7 %) as sticky solid (TFA salt). HPLC (purity): 99.7% 1H-NMR: (400 MHz, D20): 5450—446 (m, 3H), 3.63—3.49 (m, 2H), 2.56—2.49 (m, 2H), 2.35— 2.29 (m, 2H), 1.57 (d, J= 6.8 Hz, 3H), 1.36 (d, J= 6.0 Hz, 3H); Mass (ESI): m/z 483.1 [2M++1] _ 96 _ Scheme 2S-I5: N’/ \> NHT>_N Step2 O _N Step 1 NH—)— EDCI -'OH N _\> N...

BOGO 28-Y 3060 "‘0“ 28-FNL-29 ZS AQ .TFA 0 ZS-FNL-30 N/ \ o —N Step 3 —> N-IH isobutyryl "'OH de 0 28-FNL-31 S s of tert-but l 2- 2R 3 h drox -l-0x0 rimidin-Z- lmeth 1 amino butan-Z- l-l-meth loxo-2 5-diazas iro 3.4 octane-S-carbox late ZS-FNL-29: To a stirring solution of compound 2S-AQ (500 mg, 1.46 mmol) in CH2C12 (15 mL) were added DIPEA (0.76 mL, 4.38 mmol), EDCI.HC1 (334 mg, 1.75 mmol), HOBt (334 mg, 1.75 mmol) followed by ZS-Y (252 mg, 1.75 mmol) at 0 °C and stirred at RT for 16 h.

After consumption of the starting material (by TLC), the reaction mixture was diluted with water (20 mL) and extracted with CH2C12 (2 x 30 mL). The combined organic layer was washed with citric acid solution (20 mL), NaHCO3 (l x 30 mL) followed by brine (1 x 50 mL).

The organic layer was dried over anhydrous NaZSO4, d and concentrated under reduced pressure. Obtained crude material was d by silica gel column chromatography eluting 2% MeOH/DCM to afford (ZS-FNL-29) (200 mg, 31.6%) as white solid. 1H-NMR: (400 MHz, CD30D): 5 8.74—8.70 (m, 2H), 7.37—7.32 (m, 1H), 4.72—4.43 (m, 3H), 4.24-4.14 (m, 1H), 4.10-3.88 (m, 2H),3.52-3.36 (m, 2H), 2.22-2.19 (m, 2H), .94 (m, 1H), 1.88—1.79 (m, 1H), 1.45-1.41 (m, 3H), 1.40 (s, 9H), 1.29—1.26 (m, 3H), Mass (ESI): 434.5 [M++1], HPLC:92.8% S nthesis of 2S 3R h drox l-meth l0x0-2 5-diazas iro 3.4 octan-Z- l-N- myrimidin-Z-ylmethyl) butanamide gZS-FNL-301: To a stirring solution of nd (2S-FNL-29) (250 mg, 0.57 mmol) in DCM (10 mL) was added TFA (0.44 mL) under N2 atmosphere and stirred for 2 h at RT. After consumption of the starting material (by TLC), the on e was concentrated under WO 20783 -97_ reduced pressure. The obtained crude material was triturated with diethylether/n—pentane (5 mL/5 mL) and dried under reduced pressure to afford (ZS-FNL-30) (180 mg, 94.7%) as semi solid (TFA salt). 1H-NMR: (400 MHz, D20): 5 8.82 (d, .1: 2.0 Hz, 2H), 7.53 (t, J= 4.8 Hz, 1H), 4.67—4.62 (m, 2H), 4.44—4.40 (m, 1H), 4.34—4.32 (m, 2H), .56 (m, 2H), 2.51—2.20 (m, 4H), 1.55—1.46 (m, 3H), .29 (m, 3H) LCMS (ESI) : m/z 333.3 HPLC: 90.7% To a stirring solution of compound (2S-FNL-30) (150 mg, 0.45 mmol) in DCM (5 mL) was added TEA (0.18 mL, 1.35 mmol) followed by isobutyryl chloride (57 mg, 0.54 mmol) at 0 °C under N2 atmosphere and stirred for 2 h at RT. After consumption of the starting al (by TLC), the reaction mixture was diluted with water (5 mL) and extracted with CHZClz (2 x 10 mL). The combined organic layer was dried over anhydrous NaZSO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by silica gel column chromatography eluting 2% MeOH/DCM to afford (2S-FNL-31) (85 mg, 47%) as semi solid. 1H-NMR: (400 MHz, CD30D): 5 8.73 (d, .1: 4.8 Hz, 2H), 7.36 (t, .1: 4.8 Hz, 1H), 4.83—4.54 (m, 3H), 4.35—4.32 (m, 1H), 4.22—4.11 (m, 1H), .88 (m, 1H), 3.76—3.71 (m, 1H), 3.67— 3.60 (m, 2H), .76 (m, 1H), 2.21—2.07 (m, 3H), 1.96—1.91 (m, 1H), 1.29-1.26 (m, 6H), 1.05—1.02 (m, 6H) LCMS (ESI) : m/Z 404.4 HPLC:93.57% _ 98 _ Scheme 2S-I6: Ste 1 Ste 2 N 23-BM DTAD Boc’ O 023-22 'OBn 'OBn 23-AN 23-23 Step 3 N Step 4 —» N: —» N N .. I Pd-C/H2 I 800 TFA 0 "'OH 0 ”'OH 23-24 23-FNL-32 S nthesis of tert-but l 2- 2S 3R ben 10x 0x0 rrolidin-l- l butan l carbamo 1 l-h drox eth l rrolidine-l-carbox late 2S-22 : To a stirring solution of compound 2S-AN (2.5 g, 9.65 mmol) in CHzClz (50 mL) were added compound ZS-BM (2.7 g, 10.6 mmol), EDCI.HC1 (2.7 g, 14.4 mmol) followed by HOBt (1.9 g, 14.4 mmol) and DIPEA (5.3 mL, 28.9 mmol) at 0 °C and stirred for 12 h.

After consumption of the sta1ting material (by TLC), the reaction mixture was d with water (30 mL) and extracted with CHzClz (2 x 50 mL). The separated organic layer was washed with brine, dried over anhydrous NaZSO4, filtered and concentrated under reduced re. ed crude material was purified by silica gel column chromatography eluting 2% CM to afford compound 28-22 (3.5 g, 73%) as colorless liquid. 1H-NMR: (500 MHz, DMSO—dé): 6 8.11 (d, J: 9.0 Hz, 1H), 7.82 (d, J: 8.5 Hz, 1H), 7.33— 7.26 (m, 5H), 6.56 (s, 1H), 4.68—4.63 (m, 1H), 4.56 (s, 2H), 3.80—3.74 (m, 1H), 3.55—3.33 (m, 5H), 1.76-1.66 (m, 7H), 1.40 (s, 9H), 1.37—1.24 (m, 2H), 1.08—0.97 (m, 6H).

Mass (ESI): m/Z 504 [M++1].

S nthesis 0f tert—but l 2- 2S 3R ben 10x 0x0 rrolidin-l- l butan l To a stirring solution of compound 2S-22 (3.5 g, 6.95 mmol) in THF (50 mL) was added triphenylphosphine (3.6 g, 13.9 mmol) and DTAD (3.2 g, 13.9 mmol). The reaction mixture was stirred at RT for 16 h. After consumption of the ng material (by TLC), the on was concentrated under reduced pressure. The crude material was purified by silica gel column chromatography eluting 30% hexane to afford compound 2S-23 (1.0 g, 30%) as pale yellow liquid. -99_ 1H—NMR: (500 MHz, DMSO—dg): 5 7.63—7.54 (m, 1H), 7.41—7.24 (m, 4H), .37 (m, 3H), 3.98 (d, J= 10.0 Hz, 1H), 3.91 (d, J= 7.0 Hz, 1H), 3.77 (d, J= 7.0 Hz, 2H), 3.44-3.34 (m, 4H), 2.01—1.91 (m, 2H), 1.85—1.68 (m, 6H), 1.40 (s, 9H), 1.20—1.11 (m, 6H).

Mass (ESI): m/z 486.6 [M++1].

S nthesis of 2S 3R 5- tert-butox carbon 1 0xo-2 as iro 3.4 octan-Z- l hydroxybutanoic acid {ZS-24 1: To a stirring solution of compound 2S-23 (1 g) in methanol (30 mL) was added % Pd/C (400 mg) at RT and d for 12 h under H2 atmosphere (balloon re). After consumption of the starting material (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with methanol. Obtained filtrate was concentrated under reduced pressure to afford compound 28-24 (230 mg, 28%) as white solid. 1H-NMR: (500 MHz, DMSO—dg): 5 4.79 (br s, 1H), 4.34 (br s, 1H), 4.27 (d, J= 8.5 Hz, 1H), 4.03-3.95 (m, 1H), 3.78 (d, J= 6.5 Hz, 1H), 3.67-3.63 (m, 1H), 3.53-3.49 (m, 2H), 3.39 (t, J= 9.0 Hz, 2H), 2.04—1.67 (m, 8H), 1.36 (s, 9H), 1.26 (d, J: 6.0 Hz, 3H), 1.08, 1.06 (dd, J: 6.5 Hz, 3H).

LCMS: 396.4 [M++1].

S nthesis of 2- 2S 3R h drox oxo—1- rrolidin-l- l butan-Z- lmeth 1-2 5- diazaspiro |3.4| l-one 12S-FNL-32): To a stirring solution of compound 2S—24 (230 mg, 0.58 mmol) in CHZCIZ (2 mL) was added TFA (0.44 mL, 5.82 mmol) at 0 OC and stirred at RT for 2 h. After tion of reaction (by TLC), the reaction mixture was concentrated under d pressure to afford (2S-FNL-32) was triturated with e and diethyl ether (5 mL/5 mL) (210 mg, 92%) as sticky solid (TFA salt). 1H-NMR: (400 MHz, D20): 5 4.27 (d, J= 8.0 Hz, 1H), 4.07-4.03 (m, 1H), 4.01-3.97 (m, 1H), 3.52-3.48 (m, 1H), 3.39-3.35 (m, 2H), 3.32-3.20 (m, 3H), 2.16 (t, J = 7.6 Hz, 2H), 2.06—1.96 (m, 2H), 1.89—1.80 (m, 2H), 1.78—1.74 (m, 2H), 1.43 (d, J= 6.4 Hz, 3H), 1.06 (d, J= 6.0 Hz, 3H); - 100 — Scheme 2S-I 7: N --IOH 'OH | EDCI NH4C| TFA Boc BocO ZS-BC 28-FNL-33 28-FNL-34 S nthesis 0f tert-but 12- 2S 3R amin0h drox butan-2— lmeth l-l-oxo-Z -diazas iro 3.4 octane-S-carbox late 2S-FNL-33: To a stirring solution of nd 2S-BC (1.5 g, 4.38 mmol) in DCM (25 mL) were added N, N-diisopropylethylamine (2.35 mL, 13.14 mmol), NH4Cl (310 mg, 8.76 mmol), followed by EDCI (l g, 5.25 mmol), HOBT (793 mg, 5.25 mmol) at 0 °C and stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (20 mL). The separated organic layer was washed with citric acid solution (1 x 30 mL) followed by brine solution (1 x 30 mL). The organic layer was dried over ous NaZSO4 and concentrated under reduced pressure to afford crude compound which was d by column chromatography by eluting 5% MeOH/DCM to ed compound (2S-FNL-33) (600 mg, 41%) as white solid. 1H-NMR: (400 MHz, CDgOD): 5 4.24-4.17 (m, 1H), 4.03—3.99 (m, 3H), 3.67—3.46 (m, 1H), 2.40—1.99 (m, 3H), 1.68—1.62 (m, 1H), 1.46 (s, 9H), 1.24-1.18 (m, 6H); LCMS (ESI): m/z 342.5 [M++1] S nthesis of 2S 3R h drox 6-meth l-l-oxo-Z 5-diazas iro 3.4 octan-Z- l butanamide 12S-FNL-34):

[00239] To a stirring solution of nd (2S-FNL-33) (200 mg, 0.58 mmol) in DCM (10 mL) was added trifluoroacetic acid (0.5 mL), at 0° C under N2 atmosphere. The reaction e was stirred at RT for 2h. After consumption of the starting material (by TLC), the reaction mixture was concentrated under reduced re to afford crude, which was triturated with n-pentane (10mL) to afford (2S-FNL-34) (100 mg, 71%) as white solid. 1H-NMR: (400 MHz, D20): 5 4.35-4.27 (m, 2H), 4.08—3.93 (m, 3H), 2.58—2.52 (m, 1H), 2.48— 2.44 (m, 2H), 1.92—1.86 (m, 1H), 1.51, 1.48 (dd, J: 6.8 Hz, 6.4 Hz, 3H), 1.31, 1.28 (dd, J= 6.0 Hz, 6.4 Hz, 3H); LCMS (ESI): 241.3 [M++1] Scheme 2S-I8: - 101 — NBocO 28-BMEDCI I ., 'OBn Boco '“OBn DTAD PPh3 BoCO 28-25 28-26 28-AZ Step 3 Step 4”MM”GOO Pd/C 8060 CONS 23-27 23-FNL-35 S nthesis of tert-but l 2- 2S 3R ben 10x 0x0 rrolidin-l- l butan-Z- l carbamo l h drox meth l-S-meth l rrolidine—l-carbox late 2S-25 : To a stirring solution of compound 2S-AZ (1.1 g, 4.28 mmol) in DCM (20 mL) were added N, N-diisopropylethylamine (2.2 mL, 12.8 mmol), ZS-BM (1.2 g, 4.78 mmol), followed by EDCI (2.45 g, 12.8 mmol), HOBT (1.7 g, 12.8 mmol) at 0 OC and stirred at RT for 12 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (10 mL). The separated organic layer was washed with saturated NaHCO; solution (1x25 mL), followed by brine solution (1x30 mL). The separated organic layer was dried over anhydrous Na2S04 and trated under reduced pressure to afford crude compound which was purified by column chromatography eluting 5% MeOH/DCM to obtained compound 2S-25 (1.2 g, 57%) as a thick white syrup. 1H-NMR: (400 MHZ, DMSO—dg): 5 7.93 (t, J= 7.6 Hz, 1H), 7.71—7.26 (m, 5H), 5.30 (br s, 1H), 4.65—4.61 (m, 1H), 4.57 (s, 2H), 3.93—3.85 (m, 2H), 3.57—3.34 (m, 2H), 3.17—3.09 (m, 2H), 2.07— 1.94 (m, 2H), .73 (m, 4H), .28 (m, 10H), 1.20 (s, 9H); LCMS: m/z 504.7 [M++1].

S nthesis of tert—bu l 2- 2S 3R ben 10x 0x0 rrolidin-l- l butan-Z- l meth l-l-oxo-Z 5-diazas iro 3.4 octane-S-carbox late 2S-26: To a stirring solution of compound 2S-25 (0.6 g, 1.19 mmol) in THF (10 mL) was added nylphosphine (0.46 g, 1.78 mmol) and DTAD (0.4 g, 1.78 mmol). The reaction mixture was stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (10 mL). The ted organic layer was washed with brine solution (1x30 mL). The separated c layer was dried over anhydrous Na2SO4 and trated under reduced pressure to afford crude compound which was purified by column chromatography eluting 2% CM to obtained compound 2S-26 (0.2 g, 35%) as white solid. -102— 1H-NMR: (500 MHz, DMSO—d6): 5 7.63—7.26 (m, 5H), 4.52 (s, 2H), 3.91—3.77 (m, 3H), 3.56— 3.36 (m, 4H), 2.35—2.11 (m, 4H), 1.94—1.68 (m, 6H), 1.39 (s, 9H), 1.13, 1.09 (dd, J: 6.0 Hz, .5 Hz, 3H), 1.04 (d, J: 6.5 Hz, 3H); LCMS: m/z 486.6 [M++1].

S nthesis 0f tert—but 1 2- 2S 3R ben 10x 0x0 rrolidin-l- 1 butan-Z- 1 To a ng on of compound 2S-26 (1.5 g, 3.09 mmol) in methanol (20 mL) was added 10%Pd/C (200 mg) under N2 atmosphere. The reaction mixture was d under H2 atmosphere (balloon pressure) at RT for 4 h. After consumption of the starting material (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with methanol. Obtained filtrate was concentrated under reduced re to afford crude compound which was purified by column chromatography to obtained compound 2S-27 (0.9 g, 90.9%) as white solid. 1H-NMR: (500 MHz, CDC13): 5 4.11 (d, J= 7.0 Hz, 1H), 3.96—3.90 (m, 1H), 3.73 (s, 2H), 3.49 (d, J= 13.0 Hz, 2H), 3.40-3.34 (m, 2H), 2.50—2.28 (m, 4H), 2.17—1.82 (m, 6H), 1.53 (s, 9H), 1.52—1.41 (m, 3H), 1.36—1.18 (m, 3H); LCMS: 396.5 [M++1].

S nthesis of 2- 2S 3R h drox ox0 rrolidin-l- 1 butan-Z- l-6—meth 1-2 5- diazaspiro |3.4| octan-l-one gZS-FNL-352:

[00243] To a ng solution of compound 2S-27 (0.18 g, 0.45 mmol) in methanol (10 mL) was added TFA (3 mL) under N2 here at 0 °C. After ption of the starting material (by TLC), the reaction mixture was concentrated under reduced pressure to afford crude compound which was triturated with n-pentane (10 mL) to obtained (2S-FNL-35) (0.1 g, 74.6%) as white solid. 1H-NMR: (400 MHZ, s): 5 9.99 (br s, 1H), 9.57 (br s, 1H), 4.32 (d, J: 7.6 Hz, 1H), 3.93 (t, J= 6.0 Hz, 1H), 3.81—3.75 (m, 3H), 3.51—3.46 (m, 2H), 3.30 (t, J= 6.8 Hz, 2H), 2.29— 2.20 (m, 3H), 1.93-1.75 (m, 4H), 1.68-1.63 (m, 1H), 1.34 (d, J: 6.8 Hz, 3H), 1.13 (d, J= 6.4 Hz, 3H); Mass (ESI): m/z 296.3 [M++l] Scheme 2S-I9: - 103 — IIII“ T "'OH EDCI NH4C| ZS-BH 028-FNL-36 28-FNL-37 S nthesis 0f tert—but l 2- 2S 3R amin0h drox 0x0butan l-1 6-dimeth 1 oxo—Z 5-diazas iro 3.4 octane-S-carbox late 2S-FNL-36 : To a stirring solution of compound 2S—BH (1.8 g, 5.05 mmol) in CH2C12 (50 mL) were added DIPEA (2.62 mL, 15.15 mmol), EDCI (1.92 g, 10.1 mmol), HOBt (1.36 g, .1 mmol) followed by NH4C1 (803mg, 15.15mmol) at 0 °C and stirred for 12 h at RT. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (30 mL). The separated organic layer was washed with citric acid solution (1 x 50 mL) ed by brine solution (1 x 50 mL). The organic layer was dried over anhydrous NaZSO4 and concentrated under d pressure to afford crude compound which was purified by column chromatography by g 4% MeOH/DCM to afford (2S-FNL-36) (468 mg, 26%) as white solid. 1H-NMR: (400 MHz, DMSO—dg):57.25 (s, 2H), 4.92—4.48 (m, 1H), 4.34—4.01(m, 1H), 3.97— 3.72 (m, 3H), 2.32—1.88 (m,3H), 1.58-1.51 (m, 1H), 1.4l(s, 9H), 1.36—1.20 (m, 6H), 1.16-1.07 (m, 3H); LCMS (ESI): 356.4 [M++1]; HPLCI99. 19% S nthesis of 2S 3R 1 6—dimeth 0-2 as iro 3.4 octan-Z- l h drox butanamide gZS-FNL-37):

[00245] To a stirring on of (2S-FNL-36) (200 mg, 0.56 mmol) in DCM (5 mL) was added TFA (0.45 mL, 5.63 mmol) at 0 OC and stirred at RT for 2 h. After consumption of the starting material (by TLC), the reaction mixture was trated under reduced pressure. The crude material was triturated with diethyl ether/n-pentane (50 mL/50 mL) and dried under d pressure to afford (2S-FNL-37) (140 mg, 98%) as hygroscopic white solid (TFA salt). 1H-NMR: (400 MHz, D20):54.42—4.36 (m, 1H), 4.34-4.28 (m, 1H), 4.27—4.15 (m, 1H), 4.07— 4.01 (m, 1H), 2.57—2.49 (m, 1H), 2.46—2.36 (m, 2H), 2.01—1.90 (m, 1H), 1.56—1.50 (m, 6H), 1.32—1.29 (m, 3H); LCMS (ESI): 256.4 [M++l]; —104— HPLC (ELSD):93.86%.

Scheme 2S-20: OH O Step 1 H N Step 2 OH I NH.

N N | ZS-BM I DIAD PPh3 B000 B000 "'OBn Boco "'OBn ZS-BE 28-28 28-29 Step 3 ONOQ Step 4 Pd-C/H2 Boo O CONS TFAO 28-30 28-FNL-38 To a stirring solution of nd 2S-BE (2 g, 7.32 mmol) in DMF (20 mL) were added N,N—diisopropylethylamine (6.7 mL, 36.5 mmol), 2S-BM (2.6 g, 8.7 mmol), ed by HATU (3.3g, 8.7 mmol) at 0 °C and stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (100 mL) and EtOAc (200 mL). The separated organic layer was washed with sodium bicarbonate solution (2 x 75 mL), citric acid on (2 x 50 mL) followed by brine solution (1x 50 mL). The separated organic layer was dried over anhydrous Na2SO4 and concentrated under reduced pressure to afford crude compound which was purified by column chromatography by eluting 40% EtOAc/n—hexane to obtain compound 2S-28 (1 g, 27%) as pale yellow liquid; LCMS 518 [M++1] S nthesis of tert-bu l 2- 2S 3R benz 10x ox0 rrolidin-l- l butan—Z- l -1 6-

[00247] To a stirring solution of triphenylphosphine (1.5 g, 5.7 mmol) in THF (10 mL) was added DIAD (976 mg 4.8 mmol) as portion-wise and stirred for 20 min at RT. To this was added compound 2S-28 (1 g, 1.93 mmol) in THF (10 mL) slowly at RT and stirred for 4 h.

After consumption of the starting material (by LCMS), the reaction mixture was concentrated under reduced re. The crude material was purified by silica gel column chromatography eluting 30% hexane to afford compound 2S-29 (500 mg, 63%) as yellow liquid.

WO 20783 -105— 1H-NMR: (400 MHZ, CDC13):57.69-7.66 (m, 1H), .43 (m, 1H), 7.32—7.29 (m, 3H), 4.68 (s, 2H), 4.46—4.40 (m,1H), 4.26—4.05 (m, 2H), 3.97—3.91 (m,0.5H), 3.87-3.81 (m, 0.5H), 3.58— 3.53 (m, 1H), 3.40—3.32 (m, 2H), 2.16—2.11 (m, 1H), 2.04—1.90 (m, 2H), .71 (m, 2H), 1.41 (s, 9H), 1.32—1.21 (m, 10H), 1.17—1.15 (m, 3H).

LCMS (ESI): 500 [M++1].

S nthesis oftert-but 12- 2S3R h drox rrolidin-l- l butan-Z- l-1 6- To a stirring solution of compound 2S-29 (200 mg, 0.40 mmol) in methanol (5 mL) was added 10% Pd/C (50 mg) under N2 atmosphere. The reaction mixture was stirred under H2 atmosphere at RT for 4 h. After consumption of the starting al (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with methanol (10 mL). Obtained filtrate was concentrated under reduced pressure to obtained crude nd, which was purified by column chromatography eluting 1% MeOH/DCM to afford compound 2S-30 (100 g, 61%) as yellow syrup. 1H—NMR: (400 MHz, s): 6 4.93 (d, J= 5.6 Hz, 1H), 4.26 (d, J: 9.2 Hz, 0.5 H), 4.17 (d,.]= 7.2 Hz, 0.5 H), 4.02—3.99 (m, 1H), 3.91—3.66 , 3.33—3.30 (m, 1H), 3.55—3.50 (m, 1H), 3.19-3.16 (m, 1H), 2.69 (s, 1H), 2.13—2.03 (m, 1H), 1.99-1.87 (m, 3H), 1.81—1.75 (m, 2H), 1.56—1.50 (m, 1H), 1.39 (s, 9H), 1.19 (d, J= 5.6 Hz, 3H), 1.13 (d,J= 6.4 Hz, 6H).

LCMS: 410.5 [Mt+1].

S nthesis of 2- 2S 3R h drox ox0 rrolidin-l- lbutan-Z- l-3 6-dimeth l-2 5- diazaspiro|3.4|octan0ne gZS-FNL—38): To a stirring solution of compound 2S—30 (300 mg, 0.73 mmol) in DCM (20 mL) was added TFA (418 mg, ol) at 0 °C under N2 atmosphere. The reaction mixture was stirred at RT for 4 h. After consumption of the starting material (by TLC), the reaction mixture was ated under reduced pressure to afford crude, which was purified by preparative HPLC method to afford (2S-FNL-38) (140 mg, 46%) as thick syrup. 1H-NMR: (400 MHz, D20):54.53-4.46 (m, 1H), 4.34—4.22 (m, 2H), 4.03 (d, J: 6.4 Hz, 1H), 3.68 (s, 2H), 3.52—3.41 (m,2H), 2.44—2.37 (m, 3H), 2.03—1.94 (m, 5H), 1.56 (d, J= 6.4 Hz, 6H), 1.27 (d, J= 6.0 Hz, 3H).

LCMS (ESI): 310 [M++1].

Scheme 2S-I-15 - 106 — 0 O NHO Step 1 Step 2 03“ Step 3 H—ZSAC EDCI NH“ —> N""{0H DIAD PPh3 N Pd—C/H2 N 03,, OH 13°C BocN ELOBH I I Bee 0 Bee 0 23-BE 23BN ZS—BO ZS—BP S nthesis 0f tert-but l 2- -1 3-bis benz lox oxo r0 an l carbamo l 1- h drox eth l-S-meth l ine—l-carbox late 2S-BN: To a stirring solution of ZS-BE (3 g, 10.98 mmol) in DCM (30 mL) were added N. N—diisopropylethylamine (5.73 mL, 32.96 mmol), 28—AC (3.75 g, 13.17 mmol) followed by HATU (5 g, 13.17 mmol) at 0 °C and stirred at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was d with water (20 mL). The separated organic layer was washed with brine solution (30 mL). The organic layer was dried over anhydrous NaZSO4 and concentrated under reduced pressure to afford crude compound which was purified by column chromatography by eluting 20% EtOAc/n-hexane to obtained compound ZS-BN (2.9 g, 49%) as brown thick syrup. 1H-NMR: (500 MHz, DMSO-d6): 5 8.50 (m, 1H), 7.33—7.27 (m, 10H), 5.68—5.60 (m, 1H), .22—5.09 (m, 2H), 4.72—4.43 (m, 3H), 3.89-3.63 (m, 3H), 2.28—1.78 (m, 3H), 1.45—1.42 (m, 1H), 1.36 (s, 9H), 1.26—1.04 (m, 6H); LCMS (ESI): m/z 541.6 [M*+1] S nthesis of tert—bu 12- -1 3-bis ben 10X oxo r0 an l-1 6-dimeth l0X0-2 5- piro|3.4|octane-5—carb0xylate (ZS-BO): ] To a stirring on of triphenylphosphine (3.51 g, 13.42 mmol) in dry THF (30 mL) was added DIAD (2.21 g, 10.74 mmol) as portionwise and stirred for 15 min at RT. To this precipitated solution added 2S-BN (2.9 g, 5.37 mmol) in dry THF (15 mL) slowly at RT and stirred for 16 h. After consumption of the ng material (by TLC), the reaction mixture was concentrated under reduced pressure. The crude material was triturated with 30% di her/n-pentane. The filterate was concentrated under d pressure to obtained crude compound which was purified by silica gel column chromatography eluting 30% EtOAc/hexane to afford 28-30 (2.5 g, 89.2%) as brown thick syrup. 1H-NMR: (500 MHz, DMSO-dg): 5 7.38-7.25 (m, 10H), 5.22—5.15 (m, 2H), 4.80-4.73 (m, 2H), 4.56-4.43 (m, 2H), 3.92-3.60 (m, 3H), 1.89-1.83 (m, 3H), 1.50—1.44 (m, 1H), 1.40 (s, 9H), 1.22— 1.18 (s, 3H), 1.16—1.13 (m, 3H); —107— LCMS (ESI): m/z 523.6 [M++1] S nthesis of 2 5- utox carbon l-1 6-dimeth o-2 5-diazas iro 3.4 octan-Z-ylQhydr0xypropanoic acid gZS-BP I: ] To a stirring solution of ZS-BO (2.5 g, 4.78 mmol) in methanol (50 mL) was added 10% Pd/C (800 mg) under N2 atmosphere. The reaction mixture was stirred under H2 atmosphere at RT for 16 h. After consumption of the starting al (by TLC), the reaction mixture was filtered through a pad of celite and the pad was washed with methanol (30 mL).

Obtained filtrate was trated under reduced pressure to afford crude which was triturated with n-pentane (30 mL) to afford 2S-BP (900 mg, 56.2%) as sticky solid. 1H-NMR: (400 MHz, g): 5 4.78-4.75 (m, 1H), 4.24-4.18 (m, 1H), 3.86-3.81 (m, 1H), 3.80-3.72 (m, 2H), 3.64-3.59 (m, 1H), 2.15-1.93 (m, 3H), 1.55-1.50 (m, 1H), 1.39 (s, 9H), 1.24- 1.10 (m, 6H); LCMS (ESI): m/z 343.3 [M++1] Scheme 2S—21: Step 1 NI . 2: I}! OH Isopropylami thifl-l: B00 O ne HATU Boco 28-AF ZS-FNL—39 S nthesis 0f tert—but 12- S h drox iso r0 lamino oxo r0 an loxo—2 5- diazas iro 3.4 octane-S-carbox late 2S-FNL-39: To a stirring solution of 2S-AF (200 mg, 0.63 mmol) in CH2C12 (10 mL) were added DIPEA (0.32 mL, 1.90 mmol), isopropyl amine (0.08 mL, 0.94 mmol), HATU (287 mg, 0.75 mmol) at 0 °C and stirred to RT for 5 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (10 mL). The separated organic layer was washed with citric acid (1 x 20 mL) ed by brine solution (1 x 20 mL). The organic layer was dried over anhydrous NaZSO4, filtered and concentrated under reduced pressure. Obtained crude material was purified by preparative HPLC ation to afford (ZS-FNL-39) (150 mg, 67.2%) as white solid. 1H-NMR: (400 MHz, DMSO—dg): 6 7.76 (d, J: 8.4 Hz, 1H), 5.01—4.91 (m, 1H), 4.70 (t, J= 6.0 Hz, 1H), 4.14—4.07 (m, 1H), 3.99—3.80 (m, 2H), 3.78-3.61 (m, 2H), 3.58—3.35 (m, 2H), 2.20— 2.05 (m, 2H), 1.85-1.77 (m, 2H), 1.43 (s, 9H), 1.10-1.00 (m, 6H) -108— Mass (ESI): m/Z 356.6 [M++1] HPLC: 99.27% Scheme 2S—22: OH N/—Ph T "'OH EDCI ,Benylamine 0 Bee0 28-FNL-40 ZS-BH To a stirring on of 2S-BH (250 mg, 0.70 mmol) in CH2C12 (10 mL) were added DIPEA (0.36 mL, 2.11 mmol), EDCI (161 mg, 0.84 mmol), HOBt (129 mg, 0.84 mmol) followed by benzylamine (82 mg, 0.77 mmol) at 0 °C and stirred for 12 h at RT. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (10 mL). The separated organic layer was dried over anhydrous NaZSO4 and concentrated under reduced re to afford crude compound which was purified by column chromatography by eluting 5% MeOH/DCM to afford (2S-FNL-40) (55 mg, 16%) as an off—white solid. 1H-NMR: (400 MHz, DMSO—dg): 5 7.31—7.20 (m, 5H), 4.92—4.87 (m, 1H), 4.64—4.55 (m, 1H), .37 (m, 2H), 4.22—4.10 (m, 1H), 4.02—3.90 (m, 2H), 2.39—1.95 (m, 3H), 1.70—1.60 (m, 1H), 1.37 (s, 9H), .22 (m, 9H); LCMS (ESI): m/z 446.56 [M++1]; HPLC: 89.54% Scheme 2S—23: Step1 Nun" T --IOH EDCI 4-fluoro O benylamine ZS-BH CZS-FNL-41 S nthesis of tert—bu l 2- 2S 3R 4-flu0roben lamino h drox butan l- 1 6-dimeth loxo—2 5-diazas iro 3.4 octane-S-carbox late 2S-FNL—41 : -109— To a stirring solution of ZS-BH (500 mg, 1.40 mmol) in CH2C12 (10 mL) were added DIPEA (0.73 mL, 4.21 mmol), EDCI (321 mg, 1.68 mmol), HOBt (257 mg, 1.68 mmol) followed by 4—fluoro benzylamine (175 mg, 1.40 mmol) at 0 °C and d for 12 h at RT.

After consumption of the starting material (by TLC), the reaction mixture was diluted with water (15 mL). The separated organic layer was washed with citric acid on (1 x 25 mL) followed by brine solution (1 x 25 mL). The organic layer was dried over ous NaZSO4 and concentrated under reduced pressure to afford crude compound which was purified by column chromatography by eluting 5% MeOH/DCM followed by preparative HPLC purification to afford (ZS-FNL-41) (150 mg, 23.07%) as white solid. 1H-NMR: (400 MHZ, CD30D): 5 7.34—7.30 (m, 2H), 7.02—6.98 (m, 2H), 4.65—4.59 (m, 1H), 4.55—4.36 (m, 2H), 4.34—4.20 (m, 1H), 4.12-3.99 (m, 2H), 2.39—2.31 (m, 1H), 2.19—2.01 (m, 2H), 1.71—1.62 (m, 1H), 1.40 (s, 9H), 1.29—1.13 (m, 9H); LCMS (ESI): m/z 464.5 [M++1]; HPLC: 96.32% Scheme 2S—24: WNIII Step 1 EDCI 4- N ...0H methoxy benylamine 2S—BH 28-FNL-42 S nthesis of ut l 2- 2S 3R h drox 4-methox benz lamino oxobutan l-1 6-dimeth 0-2 5-diazas iro 3.4 octane-S-carbox late ZS-FNL-42:

[00256] To a stirring solution of ZS-BH (250 mg, 0.70 mmol) in CH2C12 (10 mL) were added DIPEA (0.36 mL, 2.11 mmol), EDCI (161 mg, 0.84 mmol), HOBt (129 mg, 0.84 mmol) followed by 4—methoxy benzylamine (106 mg, 0.77 mmol) at 0 °C and stirred for 12 h at RT.

After consumption of the starting material (by TLC), the reaction mixture was diluted with water (10 mL). The separated organic layer was washed with citric acid solution (1 x 20 mL) followed by brine on (1 x 25 mL). The c layer was dried over anhydrous NaZSO4 and concentrated under reduced pressure to afford crude compound which was purified by WO 20783 -110— column chromatography by eluting 5% CM to afford (2S-FNL—42) (60 mg, 17.9%) as an off—white solid. 1H-NMR: (400 MHz, CDgOD): 5 7.24 (d, J: 1.6 Hz, 2H), 6.85 (d, J: 1.6 Hz, 2H), 4.64—4.58 (m, 1H), 4.39—4.28 (m, 1H), 4.21—4.08 (m, 2H), 4.06—3.99 (m, 1H), 3.98-3.88 (m, 1H), 3.83 (s, 3H), 2.39-2.28 (m, 1H), 2.22—2.13 (m, 1H), 2.09—1.97 (m, 1H), .61 (m, 1H), 1.40 (s, 9H), 1.31—1.22 (m, 9H); LCMS (ESI): m/z 476.6 [M*+1]; HPLC: 90.29% Scheme 2S—25: Step 1 NW Y HATU -'|OH BocO isopropyl amine ZS-BH 23-FNL-43 To a stirring solution of 2S-BH (500 mg, 1.40 mmol) in CH2C12 (10 mL) were added DIPEA (0.73 mL, 4.21 mmol), isopropyl amine (100 mg, 1.68 mmol), HATU (798 mg, 2.1 mmol) at 0 °C and stirred for 12 h at RT. After consumption of the starting material (by TLC), the on mixture was diluted with water (10 mL). The separated organic layer was washed with citric acid solution (15 mL) followed by brine solution (15 mL). The organic layer was dried over anhydrous NaZSO4 and trated under reduced pressure to afford crude compound which was purified by column chromatography by eluting 2% MeOH/DCM followed by preparative HPLC purification to afford (2S-FNL—43) (100 mg, 18%) as white solid. 1H-NMR: (400 MHz, D20): 5 4.42-3.89 (m, 5H), 2.38-2.04 (m, 3H), 1.77-1.72 (m, 1H), 1.40 (s, 9H), 1.36—1.17 (m, 15H) LCMS (ESI): m/z 398.5 [M++1]; HPLC: 93.36% Scheme 2S—26: -111— WM”. NH Step1 NI----- \lr .. HATU tert- N --IOH BocO butyl amine I o ZS-BH 28-FNL-44 To a stirring solution of 2S-BH (500 mg, 1.40 mmol) in CHZClz (10 mL) were added DIPEA (0.62 mL, 3.51 mmol), tert—butyl amine (125 mg, 1.68 mmol), HATU (798 mg, 2.1 mmol) at 0 °C and stirred for 12 h at RT. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (10 mL). The ted organic layer was washed with citric acid on (15 mL) followed by brine solution (15 mL). The organic layer was dried over anhydrous NaZSO4 and concentrated under reduced pressure to afford crude compound which was purified by column chromatography by eluting 2% MeOH/DCM followed by preparative HPLC purification to afford (2S-FNL—44) (100 mg, 17.3%) as white solid. 1H-NMR: (500 MHz, CD30D): 5 4.53—4.50 (m, 1H), 4.08—3.99 (m, 2H), 3.82—3.79 (m, 1H), .34 (m, 1H), 2.20—2.17 (m, 2H), 2.09—2.01 (m, 1H), 1.71—1.67 (m, 1H), 1.40 (s, 9H), 1.38 (s, 9H), 1.33—1.21 (m, 9H); LCMS (ESI): m/z 412.5 [M++1]; HPLC: 93.91% Scheme 2S—27: 1“ 0H EDCI 4-fluoro 0H B00 0 benzylylamine BocN ZS-BP 28-FNL-45 ] To a stirring solution of ZS-BP (200 mg, 0.58 mmol) in DCM (10 mL) were added N. N-diisopropylethylamine (0.3 mL, 1.75 mmol), EDCI (133 mg, 0.69 mmol), HOBT (93 mg, 0.69 mmol) followed by 4—fluoro benzylamine (79.7 mg, 0.63 mmol) at 0 °C and -112— d at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was d with water (20 mL). The separated organic layer was washed with citric acid (20 mL) followed by brine solution (30 mL). The separated organic layer was dried over anhydrous NaZSO4 and concentrated under reduced pressure to afford crude compound which was purified by column chromatography by eluting 3% MeOH/DCM to obtained (2S-FNL-45) (46 mg, 17.7%) as thick syrup. 1H—NMR: (500 MHz, DMSO—dé): 6 8.63—8.59 (m, 1H), 7.30—7.26 (m, 2H), 7.15—7.07 (m, 2H), .07—5.00 (m, 1H), 4.31—4.21 (m, 3H), .62 (m, 4H), 2.13—1.84 (m, 3H), 1.58—1.52 (m, 1H), 1.36 (s, 9H), 1.32—1.20 (m, 3H), 1.18—1.13 (m, 3H); LCMS (ESI): m/z 450.5 [M++1] HPLC: 93% Scheme 2S—28: l“ OH HATU, 1‘1 OH Boc 0 Cyclo B00 0 butyllamine ZS-BP 28-FNL—46 To a stirring solution of ZS-BP (500 mg, 1.46 mmol) in DCM (15 mL) were added N, N—-diisopropylethylamine (0.76 mL, 4.38 mmol), cyclobutylamine (124 mg, 1.75 mmol) followed by HATU (665 mg, 1.75 mmol) at 0 °C and d at RT for 16 h. After consumption of the starting material (by TLC), the reaction mixture was diluted with water (20 mL). The separated organic layer was washed with citric acid (20 mL) followed by brine solution (30 mL). The organic layer was dried over anhydrous NaZSO4, d and concentrated under reduced pressure to afford crude compound which was d by column chromatography by eluting 3% MeOH/DCM to obtained (2S-FNL-46) (110 mg, 19%) as an off—white solid. 1H-NMR: (400 MHz, DMSO—ds): 6 8.23 (d, J: 8.0 Hz, 1H), 4.98—4.83 (m, 1H), 4.30—4.13 (m, 2H), 3.95—3.76 (m, 2H), 3.72—3.66 (m, 2H), 2.49—1.89 (m, 3H), 1.64—1.54 (m, 3H), 1.48 (s, 9H), 1.19—1.12(m, 10H); LCMS (ESI): m/z 396.5 [M++1] HPLC: 96.6% -113— Example 3 — 3H MK-801 binding assay Methods Assays were conducted as described in Moskal et al. (Moskal, J.R., Kuo, A.G., Weiss, C., Wood, P.L., O'Connor , A., Kelso, S., Harris, R.B., Disterhoft, J.F., 2005.

GLYX—13: a monoclonal antibody—derived peptide that acts as an N—methyl-D—aspartate receptor modulator. Neuropharmacology. 49, 7) The potentiation of [3H]MK—801 binding (5 nM; 22.5 Ci / mmol) to well washed rat cortical membranes (200 pg) was measured under non-equilibrium conditions (15 min @ 25 0C) in the presence of increasing concentrations of test compounds and 50uM glutamate. Zero levels were determined in the e of any glycine ligand and in the presence of 30uM 5,7 DCKA. Maximal stimulation was measured in the presence of 1 mM glycine, and 50uM glutamate was present in all samples. The facilitation of [3H]MK-801 binding by tests compounds was ated by using a 3 parameter log agonist vs. response equation (Graph pad Prism, USA) and potency (EC50 expressed in pM) and maximal activity (% maximal stimulation) were calculated for the test compound.

Results As shown in Table 2 and Figure l, the pEC50 and maximal activity for Compound X are -7.4 and 38%.

Table 2.

Act1v1ty nd pEC50 Table 3. Additional Biological Data nd [3H] MK- Unified Unified Unified Unified Unified Unified Unified 801 Activity Data: Activity Data: Activity Activity Activity ty Activity binding LTP LTP Data: LTP, Data: Data: Data: Data: assay: Augmentation Concentration Significant Porsolt Porsolt t Porsolt EC50 (M) (Percent) (uM) (S) or Non- Floating Dose Dose, Time Post significant Time (mg/kg) route Dose (NS) Inhibition (Hours) (Percent) .43E-08 130 80 —114— FNL—21 - LIE-08 FNL—7 25_ 34913—12 FNL—27 FNL—34 Exam 1e 4— Lon Term Potentiation in Hi ocam a1 Slices Methods Assays were conducted as described in Zhang et a1. (Zhang, X.L., Sullivan, J.A., Moskal, J.R., Stanton, P.K., 2008. A NMDA receptor e site partial agonist, GLYX-l3, simultaneously enhances LTP and reduces LTD at Schaffer collateral-CA1 synapses in hippocampus. Neuropharmacology. 55, 123 8—50) Sprague—Dawley rats (12—18 days old; Taconic Farms) were deeply anesthetized with isoflurane and decapitated. Rat brains were removed rapidly, submerged in ice—cold artificial cerebrospinal fluid (ACSF, 2—4 0C), which contained (in mM): 124 NaCl, 4 KCl, 2 MgSO4, 2 CaCl2, 1.25 NaH2PO4, 26 NaHCO3, 10 glucose; at pH 7.4, gassed continuously with 95% 02/5% C02). The rat brains were hemisected, the l lobes cut off, and individual heres glued using crylate adhesive onto a stage immersed in ice—cold ACSF gassed continuously with 95% 02/5% CO2 during slicing. Coronal slices (400 pm thick) were cut using a Vibratome (Leica S), and transferred to an interface holding chamber for incubation at room temperature for a m of one hour before transferring to a Haas-style interface ing chamber continuously perfused at 3 ml/min with oxygenated ACSF at 32 i 0.5 °C. Low resistance recording electrodes were made from thin—walled borosilicate glass (1—2 M!) after filling with ACSF) and inserted into the apical dendritic region of the Schaffer collateral ation field in stratum radiatum of field CA1 region to record field excitatory postsynaptic potentials (fEPSPs). A bipolar stainless steel stimulating electrode (FHC Co.) was placed on Schaffer collateral-commissural fibers in CA3 stratum radiatum, and constant current stimulus intensity adjusted to evoke approximately half—maximal fEPSPs once each 30 s 0 pA; 100 us duration). fEPSP slope was measured before and after induction of LTP by linear interpolation from 20 to 80% of maximum negative deflection, and slopes confirmed to be stable to within :: % for at least 15 min before cing an experiment. Bath application of the test compound (1 uM) was applied 30 min prior to ation of Schaffer collateral stimulus trains -115— to elicit LTP. LTP was induced by stimulation of Schaffer collateral axons with four high frequency theta burst stimulus trains of 10 X 100 Hz/5 pulse bursts each, d at an inter- burst interval of 200 ms. Each train was 2 seconds in duration, and trains were applied 15 seconds apart. The signals were recorded using a Multiclamp 700B amplifier and digitized with a Digidata 1322 (Axon Instruments, USA). Data were analyzed using pClamp software (version 9, Axon Instruments) on an IBM-compatible personal computer.

] As shown in Figure 2, Compound X tested at 1 uM increased long-term potentiation after high frequency stimulation of rat er collateral—evoked NMDA e.p.s.c.s recorded in CA1 pyramidal neurons.

Table 4. Additional ical Data Compound MK-801 Glycine LTP: LTP LTP: LTP LTP; LTP Site Binding Augmentation (%) Concentration Significance, S or Assay: Rat Cortex (uM) NS EC50 M -FNL—38 3.313E-09 —FNL_2 -08 -FNL—10 1.188E-12 -FNL-14 6.133E-11 —FNL—33 1.89E-08 EQUIVALENTS Those skilled in the art will recognize, or be able to ascertain using no more than e experimentation, many equivalents to the specific embodiments of the ion described herein. Such equivalents are intended to be encompassed by the following claims.

INCORPORATION BY REFERENCE ] The entire contents of all patents, published patent applications, websites, and other references cited herein are hereby expressly incorporated herein in their entireties by reference.

Claims (60)

What is claimed is:

1. A compound represented by formula I: or a pharmaceutically acceptable salt, a isomer, or an N-oxide thereof, wherein Rb is selected from the group consisting of H, halogen, hydroxyl, cyano and C1-C6 alkyl; R1 is H or C1-C6 alkyl; R2 is H or C1-C6 alkyl; R3 is selected from the group consisting of H, C1-C6 alkyl and a nitrogen protecting group; n the nitrogen protecting group is selected from the group consisting of 9- fluorenylmethyloxycarbonyl, tert-butoxycarbonyl, benzyloxycarbonyl, pmethoxybenzyloxycarbonyl , acetyl, trifluoroacetyl, benzoyl, benzyl, p-methoxybenzyl, pmethoxyphenyl , 3,4-dimethoxybenzyl, triphenylmethyl, p-toluenesulfonyl, –C(O)OR31 and – C(O)R32; wherein R31 is selected from the group ting of C1-C6 alkyl, C1-C6 haloalkyl, C2-C6 alkenyl, C2-C6 alkynyl, C3-C10 cycloalkyl, -CH2-C3-C10 lkyl, -CH2-phenyl, and –CH2-pyridyl, wherein any aforementioned cycloalkyl is optionally substituted with from 1-3 independently selected C1-C3 alkyl, and n the phenyl is optionally substituted with from 1-2 tuents independently selected from C1-C3 alkyl, C1-C3 haloalkyl, C1-C3 alkoxy, C1-C3 haloalkoxy, nitro, halo, SO2Me, cyano, and -OC(O)CH3; and R32 is selected from the group consisting of H, C1-C6 alkyl, C1-C6 kyl, phenyl, and pyridyl, wherein the phenyl is optionally substituted with from 1-2 substituents independently selected from C1-C3 alkyl, C1-C3 haloalkyl, C1-C3 alkoxy, C1-C3 haloalkoxy, nitro, halo, SO2Me, cyano, and -OC(O)CH3; R4 and R5 are each independently selected from the group consisting of H, C1-C6 alkyl, X, and –C1-C6 alkylene-X, wherein X is selected from the group consisting of: (i) C3-C6 cycloalkyl; (ii) heteroaryl including from 5 to 6 ring atoms wherein 1, 2, or 3 of the ring atoms are independently selected from the group ting of N, NH, N(C1-C3 alkyl), O, and S; (iii) heterocyclyl including from 3 to 6 ring atoms wherein 1, 2, or 3 of the ring atoms are independently selected from the group consisting of N, NH, N(C1-C3 alkyl), O, and S; and (iv) phenyl; wherein C3-C6 lkyl and heterocyclyl are each unsubstituted or substituted with from 1-3 substituents independently selected from the group consisting of n, cyano, oxo, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and -N(R’)R’; and aryl and phenyl are each unsubstituted or substituted with from 1-3 substituents independently selected from the group consisting of halogen, cyano, C1-C6 alkyl, hydroxyl, C1-C6 , and -N(R’)R’; or R4 and R5 er with the nitrogen to which they are attached form: heterocyclyl including from 4 to 6 ring atoms; wherein the heterocyclyl includes not more than two ring heteroatoms (including the nitrogen atom attached to R4 and R5), and the second ring heteroatom, when present, is independently selected from the group consisting of N, NH, N(C1-C3 alkyl), O, and S; and wherein the heterocyclyl is unsubstituted or substituted with from 1-3 substituents independently ed from the group consisting of halogen, cyano, oxo, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and -N(R’)R’; or heteroaryl including from 5 to 6 ring atoms; wherein the heteroaryl includes not more than four ring heteroatoms (including the nitrogen atom attached to R4 and R5), and each additional ring heteroatom, when present, is independently selected from the group consisting of N, NH, N(C1-C3 alkyl), O, and S; and wherein the heteroaryl is unsubstituted or substituted with from 1-3 substituents ndently ed from the group consisting of halogen, cyano, C1-C6 alkyl, hydroxyl, C1-C6 , and -N(R’)R’; R6 is selected from the group consisting of -OH, C1-C6 alkoxy, -OC(O)-C1-C6 alkyl, - OC(O)phenyl, and -N(R’)R’; R7 is H or C1-C6 alkyl; and R’ is independently selected for each occurrence from H and C1-C6 alkyl.

2. The compound of claim 1, wherein R1 is H.

3. The compound of claim 1 or claim 2, wherein R2 is H.

4. The compound of any one of claims 1 to 3, n R3 is H.

5. The compound of any one of claims 1 to 3, wherein R3 is a en protecting group.

6. The compound of claim 5, wherein R3 has formula R31.

7. The compound of claim 6, wherein R31 is C1-C6 alkyl.

8. The nd of claim 7, wherein R31 is tert-butyl.

9. The compound of claim 5, wherein R3 has formula –C(O)R32.

10. The compound of claim 9, n R32 is C1-C6 alkyl.

11. The compound of claim 10, wherein R32 is –CH3 or iso-propyl.

12. The compound of any one of claims 1 to 11, wherein R4 and R5 are each independently selected from the group consisting of H, C1-C6 alkyl, and –C1-C6 alkylene-X.

13. The nd of claim 12, wherein R4 and R5 are each independently selected from the group consisting of H and –C1-C6 alkylene-X.

14. The compound of claim 13, wherein one of R4 and R5 is H, and the other is –C1-C6 alkylene-X.

15. The compound of any one of claims 1 or claims 12 to 14, wherein –C1-C6 alkylene-X is

16. The compound of any one of claims 1 or claims 12 to 15, wherein X is phenyl or heteroaryl including from 5 to 6 ring atoms n 1, 2, or 3 of the ring atoms are ndently selected from the group consisting of N, NH, N(C1-C3 alkyl), O, and S; each unsubstituted or substituted with from 1-3 substituents independently selected from the group consisting of halogen, cyano, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and -N(R’)R’.

17. The compound of any one of claims 1 to 13, n R4 and R5 are H.

18. The compound of any one of claims 1 to 11, wherein R4 and R5 together with the nitrogen to which they are attached form: heterocyclyl including from 4 to 6 ring atoms; wherein the heterocyclyl includes not more than two ring heteroatoms (including the en atom attached to R4 and R5), and the second ring heteroatom, when present, is independently selected from the group consisting of N, NH, N(C1-C3 alkyl), O, and S; and wherein the heterocyclyl is unsubstituted or substituted with from 1-3 substituents independently selected from the group consisting of halogen, cyano, oxo, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and -N(R’)R’; or heteroaryl including from 5 to 6 ring atoms; wherein the heteroaryl includes not more than four ring heteroatoms (including the nitrogen atom attached to R4 and R5), and each additional ring heteroatom, when present, is independently selected from the group consisting of N, NH, N( C1-C3 alkyl), O, and S; and wherein the heteroaryl is unsubstituted or substituted with from 1-3 substituents independently ed from the group consisting of halogen, cyano, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and -N(R’)R’.

19. The compound of claim 18, wherein R4 and R5 taken together with the nitrogen to which they are attached form a ring selected from the group consisting of azetidinyl, pyrrolidinyl, pyrazolidinyl, isooxazolidinyl, imidazolidinyl, oxazolidinyl, lidinyl, and azolidinyl.

20. The compound of claim 19, wherein R4 and R5 taken together with the en to which they are attached form a pyrrolidinyl ring.

21. The nd of claim 18, wherein R4 and R5 taken together with the nitrogen to which they are attached form a ring selected from the group consisting of imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, pyridinyl, diazinyl, oxazinyl, and thiazinyl.

22. The compound of claim 1, wherein R1 is H or CH3; R2 is H or CH3; R3 is H; and R4 and R5 taken together form a pyrrolidinyl ring.

23. The compound of claim 1, wherein R1 is H or CH3; R2 is H or CH3; R3 is H; and R4 and R5 are H.

24. The nd of claim 1, wherein R1 is H or CH3; R2 is H or CH3; R3 is H; and one of R4 and R5 is H, and the other is , wherein X is phenyl or heteroaryl including from 5 to 6 ring atoms wherein 1, 2, or 3 of the ring atoms are independently selected from the group consisting of N, NH, N(C1-C3 alkyl), O, and S; each tituted or substituted with from 1-3 substituents independently selected from the group consisting of halogen, cyano, C1-C6 alkyl, yl, C1-C6 alkoxy, and -N(R’)R’.

25. The compound of claim 1, wherein R1 is H or CH3; R2 is H or CH3; R3 is nitrogen protecting group; and R4 and R5 taken together form a pyrrolidinyl ring.

26. The compound of claim 1, wherein R1 is H or CH3; R2 is H or CH3; R3 is nitrogen protecting group; and R4 and R5 are H.

27. The compound of claim 1, wherein R1 is H or CH3; R2 is H or CH3; R3 is nitrogen protecting group; and one of R4 and R5 is H, and the other is –CH2-X, wherein X is phenyl or heteroaryl including from 5 to 6 ring atoms wherein 1, 2, or 3 of the ring atoms are independently selected from the group consisting of N, NH, N(C1-C3 alkyl), O, and S; each unsubstituted or substituted with from 1-3 substituents independently ed from the group ting of halogen, cyano, C1-C6 alkyl, hydroxyl, C1-C6 alkoxy, and -N(R’)R’.

28. The compound of any one of claims 1 to 27, wherein R6 is selected from the group consisting of -OH, C1-C6 alkoxy, -OC(O)-C1-C6 alkyl, and -OC(O)phenyl.

29. The compound of claim 28, n R6 is –OH.

30. The compound of any one of claims 1 to 29, wherein R7 is C1-C6 alkyl.

31. The compound of claim 30, wherein R7 is –CH3.

32. The compound of claim 1, wherein the compound is selected from the group consisting , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , and , or a pharmaceutically acceptable salt, a isomer, or an N-oxide thereof.

33. A pharmaceutical composition comprising a compound of any one of claims 1 to 32, and a pharmaceutically acceptable excipient.

34. The pharmaceutical composition of claim 33, suitable for oral administration.

35. The pharmaceutical composition of claim 33, le for intravenous administration.

36. Use of a nd of any one of claims 1 to 32 in the manufacture of a medicament for treating depression, Alzheimer’s disease, attention deficit disorder, schizophrenia, or anxiety.

37. The compound of claim 1, represented by formula I: or a pharmaceutically acceptable salt, a stereoisomer, or an N-oxides thereof, wherein Rb is selected from the group consisting of H, halogen, hydroxyl, cyano and C1-C6 alkyl; R1 is H or C1-C6 alkyl; R2 is H or C1-C6 alkyl; R3 is selected from the group consisting of H, C1-C6 alkyl and a nitrogen protecting group; R4 and R5 are independently H or C1-C6 alkyl, or R4 and R5 taken er with the en to which they are attached form a 4-, 5- or 6-membered heterocyclic or 5-6 membered heteroaryl ring, unsubstituted or substituted with 1-3 substituents ed from the group ting of halogen, cyano, C1-C6 alkyl, -OH, C1-C6 alkoxy, and -N(R’)R’, wherein R’ is independently selected for each occurrence from H or C1-C6 alkyl; R6 is selected from the group consisting of -OH, C1-C6 , -OC(O)-C1-C6 alkyl, and -OC(O)phenyl; and R7 is H or C1-C6 alkyl.

38. The compound of claim 37, wherein R1 is H.

39. The compound of claim 37 or claim 38, wherein R2 is H.

40. The compound of any one of claims 37 to 39, wherein R3 is H.

41. The compound of any one of claims 37 to 40, wherein R4 and R5 are H.

42. The compound of any one of claims 37 to 40, wherein R4 and R5 taken together form a 4 or 5-membered heterocyclic ring selected from the group consisting of azetidinyl, pyrrolidinyl, pyrazolidinyl, isooxazolidinyl, imidazolidinyl, oxazolidinyl, thiazolidinyl, and isothiazolidinyl.

43. The compound of any one of claims 37 to 40, wherein R4 and R5 taken together form a pyrrolidine ring.

44. The compound of any one of claims 37 to 40, wherein R4 and R5 taken together form a heteroaromatic ring selected from the group consisting of imidazolyl, pyrazolyl, oxazolyl, isoxazolyl, thiazolyl, pyridinyl, diazinyl, oxazinyl, and thiazinyl.

45. The compound of claim 37, wherein R1 is H; R2 is H; R3 is H; and R4 and R5 taken together form a pyrrolidinyl ring.

46. The compound of claim 37, n R1 is H; R2 is H; R3 is H; and R4 and R5 are H.

47. The compound of claim 37, wherein the nd is selected from the group consisting of: , and .

48. The compound of claim 37, wherein the compound is: or a pharmaceutically acceptable salt, a stereoisomer, or an N-oxide thereof.

49. The compound of claim 48, wherein the compound is: or a pharmaceutically acceptable salt thereof.

50. The nd of claim 48, n the compound is: or a pharmaceutically acceptable salt thereof.

51. The compound of claim 37, wherein the compound is: or a pharmaceutically acceptable salt, a stereoisomer, or an N-oxide f.

52. The compound of claim 51, wherein the nd is: or a pharmaceutically acceptable salt thereof.

53. The compound of claim 51, wherein the compound is: or a pharmaceutically acceptable salt thereof.

54. A pharmaceutical composition comprising a compound of any one of claims 37 to 53, and a pharmaceutically acceptable excipient.

55. The pharmaceutical composition of claim 54, suitable for oral administration.

56. The pharmaceutical composition of claim 54, le for intravenous administration.

57. Use of a compound of any one of claims 37 to 53 in the manufacture of a medicament for treating depression, Alzheimer’s disease, attention deficit disorder, schizophrenia, or anxiety.

58. A compound according to any one of claims 1 to 32 or claims 37 to 53, substantially as herein described with reference to any one or more of the examples but excluding comparative examples.

59. A pharmaceutical composition according to any one of claims 33 to 35 or claims 54 to 56, ntially as herein described with nce to any one or more of the examples but excluding comparative examples.

60. Use of claim 36 or claim 57, substantially as herein described with reference to any one or more of the examples but excluding comparative examples.