WO2021127460A1 - Pcsk9 antagonist compounds - Google Patents
Pcsk9 antagonist compounds Download PDFInfo
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- WO2021127460A1 WO2021127460A1 PCT/US2020/066046 US2020066046W WO2021127460A1 WO 2021127460 A1 WO2021127460 A1 WO 2021127460A1 US 2020066046 W US2020066046 W US 2020066046W WO 2021127460 A1 WO2021127460 A1 WO 2021127460A1
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- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 230000004797 therapeutic response Effects 0.000 description 1
- 150000003567 thiocyanates Chemical class 0.000 description 1
- LJJKNPQAGWVLDQ-SNVBAGLBSA-N thiorphan Chemical compound OC(=O)CNC(=O)[C@@H](CS)CC1=CC=CC=C1 LJJKNPQAGWVLDQ-SNVBAGLBSA-N 0.000 description 1
- 238000003354 tissue distribution assay Methods 0.000 description 1
- 229950006667 tofogliflozin Drugs 0.000 description 1
- 229960005371 tolbutamide Drugs 0.000 description 1
- LBLYYCQCTBFVLH-UHFFFAOYSA-M toluenesulfonate group Chemical group C=1(C(=CC=CC1)S(=O)(=O)[O-])C LBLYYCQCTBFVLH-UHFFFAOYSA-M 0.000 description 1
- 238000011200 topical administration Methods 0.000 description 1
- CMSGWTNRGKRWGS-NQIIRXRSSA-N torcetrapib Chemical compound COC(=O)N([C@H]1C[C@@H](CC)N(C2=CC=C(C=C21)C(F)(F)F)C(=O)OCC)CC1=CC(C(F)(F)F)=CC(C(F)(F)F)=C1 CMSGWTNRGKRWGS-NQIIRXRSSA-N 0.000 description 1
- 229950004514 torcetrapib Drugs 0.000 description 1
- 125000005490 tosylate group Chemical group 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229960002051 trandolapril Drugs 0.000 description 1
- BJBUEDPLEOHJGE-IMJSIDKUSA-N trans-3-hydroxy-L-proline Chemical compound O[C@H]1CC[NH2+][C@@H]1C([O-])=O BJBUEDPLEOHJGE-IMJSIDKUSA-N 0.000 description 1
- 210000003412 trans-golgi network Anatomy 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- PBIMIGNDTBRRPI-UHFFFAOYSA-N trifluoro borate Chemical compound FOB(OF)OF PBIMIGNDTBRRPI-UHFFFAOYSA-N 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- 229960000281 trometamol Drugs 0.000 description 1
- ZDPHROOEEOARMN-UHFFFAOYSA-N undecanoic acid Chemical class CCCCCCCCCCC(O)=O ZDPHROOEEOARMN-UHFFFAOYSA-N 0.000 description 1
- 241000701161 unidentified adenovirus Species 0.000 description 1
- 230000003827 upregulation Effects 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 229960004699 valsartan Drugs 0.000 description 1
- SJSNUMAYCRRIOM-QFIPXVFZSA-N valsartan Chemical compound C1=CC(CN(C(=O)CCCC)[C@@H](C(C)C)C(O)=O)=CC=C1C1=CC=CC=C1C1=NN=N[N]1 SJSNUMAYCRRIOM-QFIPXVFZSA-N 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229960002381 vardenafil Drugs 0.000 description 1
- 229940124549 vasodilator Drugs 0.000 description 1
- 239000003071 vasodilator agent Substances 0.000 description 1
- 229960001254 vildagliptin Drugs 0.000 description 1
- SYOKIDBDQMKNDQ-XWTIBIIYSA-N vildagliptin Chemical compound C1C(O)(C2)CC(C3)CC1CC32NCC(=O)N1CCC[C@H]1C#N SYOKIDBDQMKNDQ-XWTIBIIYSA-N 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 229960001729 voglibose Drugs 0.000 description 1
- PNAMDJVUJCJOIX-XVZWKFLSSA-N vytorin Chemical compound C([C@H]1[C@@H](C)C=CC2=C[C@H](C)C[C@@H]([C@H]12)OC(=O)C(C)(C)CC)C[C@@H]1C[C@@H](O)CC(=O)O1.N1([C@@H]([C@H](C1=O)CC[C@@H](O)C=1C=CC(F)=CC=1)C=1C=CC(O)=CC=1)C1=CC=C(F)C=C1 PNAMDJVUJCJOIX-XVZWKFLSSA-N 0.000 description 1
- 229940009349 vytorin Drugs 0.000 description 1
- 229940051223 zetia Drugs 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 229940072168 zocor Drugs 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
- C07K7/50—Cyclic peptides containing at least one abnormal peptide link
- C07K7/54—Cyclic peptides containing at least one abnormal peptide link with at least one abnormal peptide link in the ring
- C07K7/56—Cyclic peptides containing at least one abnormal peptide link with at least one abnormal peptide link in the ring the cyclisation not occurring through 2,4-diamino-butanoic acid
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D498/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms
- C07D498/22—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms in which the condensed system contains four or more hetero rings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/54—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic compound
- A61K47/542—Carboxylic acids, e.g. a fatty acid or an amino acid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P3/00—Drugs for disorders of the metabolism
- A61P3/06—Antihyperlipidemics
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
- C07K7/64—Cyclic peptides containing only normal peptide links
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/48—Hydrolases (3) acting on peptide bonds (3.4)
- C12N9/50—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
- C12N9/64—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue
- C12N9/6421—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue from mammals
- C12N9/6424—Serine endopeptidases (3.4.21)
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Y—ENZYMES
- C12Y304/00—Hydrolases acting on peptide bonds, i.e. peptidases (3.4)
- C12Y304/21—Serine endopeptidases (3.4.21)
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
Definitions
- PCSK9 Proprotein convertase subtilisin-kexin type 9
- NARC-1 neural apoptosis-regulated convertase 1
- PCSK9 belongs to the mammalian proprotein convertase family of serine proteases and contains an N- terminal signal sequence, prodomain, catalytic domain, and C-terminal domain; see Seidah et ai, 2012 Nat. Rev. Drug Discov. 11:367-383.
- PCSK9 transcriptional regulation demonstrated that it is regulated by sterol regulatory element -binding proteins (“SREBP”), as seen with other genes involved in cholesterol metabolism; Maxwell et ai, 2003 J. Lipid Res. 44:2109- 2119, as is typical of other genes implicated in lipoprotein metabolism; Dubuc et al. , 2004 Arterioscler. Thromb. Vase. Biol. 24:1454-1459.
- Statins have been shown to upregulate PC SK9 expression in a manner attributed to the cholesterol-lowering effects of the drugs; supra.
- PCSK9 promoters possess two conserved sites involved in cholesterol regulation, a sterol regulatory element and an Spl site; supra.
- PCSK9 While in the endoplasmic reticulum, PCSK9 performs as its only catalytic activity an autocleavage between residues Gln-152 and Ser-153; see Naureckiene et ai, 2003 Arch. Biochem. Biophys. 420:55-67; Seidah et al, 2003 Proc. Natl. Acad. Sci. U. S. A. 100:928-933.
- the prodomain remains tightly associated with the catalytic domain during subsequent trafficking through the trans- Golgi network.
- the maturation via autocleavage has been demonstrated to be critical for PCSK9 secretion and subsequent extracellular function (see Benjannet et ai, 2012 J. Biol. Chem. 287:33745-33755). Accordingly, several lines of evidence demonstrate that PCSK9, in particular, lowers the amount of hepatic LDLR protein and thus compromises the liver's ability to remove LDL cholesterol from the circulation.
- Adenovirus-mediated overexpression of PCSK9 in the livers of mice results in the accumulation of circulating LDL-C due to a dramatic loss of hepatic LDLR protein, with no effect on LDLR mRNA levels; Benjannet et al, 2004 J. Biol. Chem. 279:48865-48875; Maxwell & Breslow, 2004 PNAS 101:7100-7105; Park et al, 2004 J. Biol. Chem. 279:50630-50638; and Lalanne et al., 2005 J. Lipid Res. 46: 1312-1319.
- mice lacking PCSK9 or in which PCSK9 mRNA has been lowered by antisense oligonucleotide inhibitors have higher levels of hepatic LDLR protein and a greater ability to clear circulating LDL-C; Rashid et al, 2005 PNAS 102:5374-5379; and Graham et al, 2007 J. Lipid Res. 48(4):763-767.
- ADH autosomal dominant hypercholesterolemia
- LDL low density lipoprotein
- PCSK9 plays a role in the regulation of LDL.
- the expression or upregulation of PCSK9 is associated with increased plasma levels of LDL cholesterol, and the corresponding inhibition or lack of expression of PCSK9 is associated with reduced LDL cholesterol plasma levels.
- Decreased levels of LDL cholesterol associated with sequence variations in PCSK9 have been found to confer protection against coronary heart disease; Cohen, 2006 N. Engl. J. Med. 354:1264-1272.
- the present invention advances these interests by providing antagonists of PCSK9 which are believed to be of use for inhibiting the activities of PCSK9 and the corresponding role PCSK9 plays in various conditions for which the administration of a PCSK9 antagonist provides therapy.
- Compounds of the instant invention have a favorable pharmacokinetic profile and prolonged pharmaceutical action.
- the invention provides a compound of Formula I: wherein:
- A is selected from C 2-6 alkyl, C 2-6 alkenyl or -(CR 2 ) n R x (CR 2 ) n -;
- a 1 is selected from
- a 2 is selected from -(CR 2 ) n X(CR 2 ) n - or -(CR 2 ) n NRC(0)(CR 2 ) n -;
- X is O or CR 2 ;
- R is independently selected from FI or Ci- 6 alkyl
- R a is independently selected from H, -CR 2 -S(0) 2 0R 9 , or -C(0)0R 9 ;
- R b is independently selected from H, Ci- 6 alkyl, or Ci- 6 alkyl-N + (CFI 3 ) 2 ;
- R x is tetrazolyl;
- R d is independently selected from FI or -C(0)0R 9 ;
- R 1 is selected from:
- R 2 is selected from:
- R 3 is H or F
- R 5 is independently selected from -(CR a 2 ) x -, -(CR a 2 ) x O(CR a 2 ) x -, and Ci-s alkyl;
- R 6 is independently selected from -(CR a 2 ) x NRC(0)-, -(CR 2 ) x NRS(0) 2 -, and -(CR a 2 ) n 0(CR a 2 ) q NRC(0)-;
- R 9 is independently selected from FI or Ci-6 alkyl;
- R 10 is independently selected from:
- R 12 is independently selected from -Cn- 2 o alkyl-R d , -(CR 2 ) x -0-(CR 2 ) x -R d , -Cn- 2 o alkyl-C(0)NR- (CR d 2 ) 2 H, and C2-16 alkenyl;
- R 20 is independently selected from a) -(CR a 2 ) t O(CR a 2 ) q O-(CR a 2 ) t -, b) -(CR a 2 ) t 0(CR a 2 ) q 0-(CR a 2 ) t -NRC(0)-, c) -(CR a 2 )t0(CR a 2 )q-NRC(0)-(CR a 2 ) n 0(CR a 2 )n0-, d) -(CR a 2 )t-NRC(0)-(CR a 2 ) q 0(CR a 2 )q0-(CR a 2 )t-, e) -(CR a 2 )tO(CR a 2 )qO-(CR a 2 )r, and f) -(CR a 2 ),-0-(CR a 2 )q0(CR a 2 )q0-(CR a 2
- the invention provides a compound of Formula I, wherein R 3 is F, or a pharmaceutically acceptable salt of any thereof.
- the invention provides compounds of Formula I, wherein:
- A is selected from C2-6 alkyl, C2-6 alkenyl or -(CR2) n R x (CR2)n-;
- a 1 is selected from
- a 2 is selected from -(CR2) n X(CR2)n- or -(CR2) n NRC(0)(CR2)n-;
- X is O or CR2
- R is independently selected from H or Ci-6 alkyl
- R a is independently selected from H, -CR2-S(0)20R 9 , or -C(0)OR 9 ;
- R b is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N + (CH3)2;
- R x is tetrazolyl
- R d is independently selected from H or -C(0)OR 9 ;
- R 1 is selected from:
- R 2 is selected from:
- R 3 is F
- R 5 is independently selected from -(CR3 ⁇ 4)x-, -(CR a 2)xO(CR3 ⁇ 4)x-, and Ci-s alkyl;
- R 6 is independently selected from -(CR a 2 ) x NRC(0)-, -(CR 2 ) X NRS(0) 2 -, and -(CR a 2 ) n O(CR3 ⁇ 4) q NRC(0)-;
- R 9 is independently selected from H or Ci- 6 alkyl
- R 10 is independently selected from:
- R 12 is independently selected from -Cn-20 alkyl-R d , -(CR2) x -0-(CR2) x -R d , - Cii-20 alkyl-C(0)NR- (CR d 2)2H, and C2-16 alkenyl;
- R 20 is independently selected from a) -(CR a 2)tO(CR a 2) q O-(CR3 ⁇ 4)t-, b) -(CR a 2 ) t 0(CR a 2 ) q 0-(CR a ) t -NRC(0)-, and c) -(CR a 2),-NRC(0)-(CR a 2)q0(CR a 2)q0-(CR a 2),-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3; q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3; t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6; provided that , then A 2 is -(CR2) n X(CR2) n -; or a
- the present invention provides pharmaceutical compositions comprising a compound of the invention, for example, a compound of Formula I, and at least one pharmaceutical excipient, preferably a composition directed to oral administration.
- the present invention provides a method of antagonizing PCSK9 in the provision of therapy for disease states related to PCSK9 activity, for example, atherosclerosis, hypercholesterolemia, coronary heart disease, metabolic syndrome, acute coronary syndrome, or related cardiovascular disease and cardiometabolic conditions, by administering to a subject in need thereof a therapeutically effective amount of a compound of Formula I, or a salt thereof, preferably in the form of a pharmaceutical composition.
- structural representation of compounds of the invention includes conventional stereochemical notation for some asymmetric carbon centers shown in the example compounds. Accordingly, in such instances, solid black “wedge” bonds represent bonds projecting from the plane of the reproduction medium, “hashed wedge” bonds representing descending bonds into the plane of the reproduction medium, and a “wavy” line appended to a carbon bearing a double bond indicates both possible cis and trans orientations are included. As is conventional, plain solid lines represent all spatial configurations for the depicted bonding. Accordingly, where no specific stereochemical notation is supplied, the representation contemplates all stereochemical and spatial orientations of the structural features.
- the preparation of individual stereoisomers in significant percentages of enantiomeric excess can be carried out, if desired, by separation of the mixture using customary methods, for example by chromatography or crystallization, or by the use of stereochemically uniform starting materials for the synthesis described, or by stereoselective synthesis.
- a derivatization can be carried out before a separation of stereoisomers.
- the separation of a mixture of stereoisomers can be carried out at an intermediate step during the synthesis of a compound of Formula I or it can be done on a final racemic product.
- absolute stereochemistry is determined by X-ray crystallography of crystalline products or crystalline intermediates which are derivatized, if necessary, with a reagent containing a stereogenic center of known configuration.
- a particular isomer, salt, solvate (including hydrates) or solvated salt of such racemate, enantiomer, or diastereomer is indicated, the present invention includes all such isomers, as well as salts, solvates (including hydrates) and solvated salts of such racemates, enantiomers, diastereomers and mixtures thereof.
- the present invention also embraces isotopically-labeled compounds of the present invention which are structurally identical to those recited herein, but for the fact that a statistically significant percentage of one or more atoms in that form of the compound are replaced by an atom having an atomic mass or mass number different from the atomic mass or mass number of the most abundant isotope usually found in nature, thus altering the naturally occurring abundance of that isotope present in a compound of the invention.
- the present invention is meant to include all suitable isotopic variations of the compounds of Formula I.
- isotopes that can be preferentially incorporated into compounds of the invention include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorus, iodine, fluorine and chlorine, for example, but not limited to: 2 H, 3 H, n C, 13 C, 14 C, 13 N, 15 N, 15 0, 17 0, 18 0, 31 P, 32 P, 35 S, 18 F, and 36 C1, 123 I, and 125 I. It will be appreciated that other isotopes may be incorporated by known means also.
- isotopically-labeled compounds of the invention are recognized as being particularly useful in compound and/or substrate tissue distribution assays using a variety of known techniques.
- compounds of the invention contemplate isotopic substitution include different isotopic forms of hydrogen (H), including protium ( ' l l) and deuterium ( 2 H or D).
- H isotopic forms of hydrogen
- protium ' l l
- deuterium 2 H or D
- Protium is the predominant hydrogen isotope found in nature. Enriching for deuterium may afford certain therapeutic advantages, such as increasing in vivo half- life or reducing dosage requirements, or may provide a compound useful as a standard for characterization of biological samples.
- Isotopically-enriched compounds within Formula I can be prepared without undue experimentation by conventional techniques well known to those skilled in the art or by processes analogous to those described in the Schemes and Examples herein using appropriate isotopically-enriched reagents and/or intermediates.
- a wavy line terminates a conventional bond (as opposed to connecting two atoms within a structure) it indicates a point of bonding to a structure, e.g.: indicates a the secondary-butyl moiety is bonded via the methylene group via the bond terminated with the wavy line.
- a dash is employed to indicate the point of bonding to the indicated substrate, e.g.: -CH2-C(0)-CH2C1 indicates the acetyl chloride moiety is bonded via the methylene portion of the moiety.
- any variable e.g., n, R, R a , R6, etc.
- its definition on each occurrence is independent of its definition at every other occurrence unless otherwise specified at the point of definition.
- R, R 6 , R 20 , etc. are to be chosen in conformity with well-known principles of chemical structure connectivity and stability, and combinations of substituents and/or variables are permissible only if such combinations result in stable compounds.
- R 10 is defined as “- R 5 - N + (CFh)2 - (R 20 )n - (R 6 )m-R 12 ”
- integer n can be selected from 1 , 2 or 3 and integer m can be selected from 0, 1 , 2, 3, or 4. If integer n in this example is 3 and integer m is 4, then each of the three R 20 substitutions and each of the four R 6 substitutions is independently selected from the list of definitions provided herein.
- a “stable” compound is a compound which can be prepared and isolated and whose structure and properties remain or can be caused to remain essentially unchanged for a period of time sufficient to allow use of the compound for the purposes described herein (e.g., therapeutic administration to a subject).
- the compounds of the present invention are limited to stable compounds embraced by Formula I.
- variable or moiety is expressed in the form of a range, e.g. (-CH2-)o-4, both of the extremes of the specified range are included (i.e. 0 and 4 in the example) as well as all of the whole number values in between (i.e. 1, 2 and 3 in the example).
- halogen includes fluorine, chlorine, bromine and iodine unless specified otherwise at the point of use.
- subjects refers to an animal, preferably a mammal, and in particular a human or a non-human animal including livestock animals and domestic animals including, but not limited to, cattle, horses, sheep, swine, goats, rabbits, cats, dogs, and other mammals in need of treatment.
- the subject is preferably a human.
- administration and variants thereof (e.g ., “administering” a compound) in reference to a compound of Formula I means providing the compound, or a pharmaceutically acceptable salt thereof, to a subject in need of treatment.
- the present invention includes the provision of compounds of Formula I, or a pharmaceutically acceptable salt thereof, which have properties that antagonize PCSK9 function.
- Formula I comprises a compound of Formula la:
- X is O or CR2;
- R is independently selected from H or Ci- 6 alkyl
- R a is independently selected from H or -C(0)0R 9 ;
- R b is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N + (CH 3 )2;
- R d is independently selected from H or -C(0)0R 9 ;
- R x is tetrazolyl;
- R 3 is F
- R 5 is independently selected from -(CR3 ⁇ 4) -, -(CR a 2)xO(CR a 2)x-, and Ci-s alkyl;
- R 6 is independently selected from -(CR a 2 ) x NRC(0)-, -(CR 2 ) X NRS(0) 2 -, and -(CR a 2)n0(CR a 2 )qNRC(0)-;
- R 9 is independently selected from FI or Ci-6 alkyl
- R 10 is independently selected from: a) - (R 5 - N iel li -R V(R 20 )n -(R 6 ) m -R 12 , b) — (R 20 )n - (R 6 )m- R 5 - N iel li -R 6 -R 12 ,
- R 12 is independently selected from -Cn- 2 o alkyl-R d , -(CR 2 ) x -0-(CR 2 ) x -R d , - Cn- 2 o alkyl-C(0)NR- (CR d 2 ) 2 H, and C2-16 alkenyl;
- R 20 is independently selected from a) -(CR a 2 )tO(CR a 2 ) q O-(CR a 2 )t-, b) -(CR a 2 ) t 0(CR a 2 ) q 0-(CR a 2 ) t -NRC(0)-, c) -(CR a 2 )t0(CR a 2 ) q -NRC(0)-(CR a 2 ) n 0(CR a 2 )n0-, d) -(CR a 2 ) t -NRC(0)-(CR a 2 ) q 0(CR a 2 ) q 0-(CR a 2 ) t -, e) -(CR a 2 )tO(CR a 2 ) q O-(CR a 2 )t-, and f) -(CR a 2 ),-0-(CR a 2 ) q 0(CR a 2
- the present invention comprises compound of Formula I, wherein: A is selected from C 2 -6 alkyl or -(CR 2 ) n R x (CR 2 ) n -;
- X is O or CR 2 ;
- R is independently selected from H or Ci- 6 alkyl
- R a is independently selected from H or -C(0)0R 9 ;
- R b is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N + (CH 3 ) 2 ;
- R x is tetrazolyl;
- R d is independently selected from H or -C(0)0R 9 ;
- R 3 is F
- R 5 is independently selected from -(CR3 ⁇ 4) -, -(CR a 2)xO(CR a 2)x-, and Ci-s alkyl;
- R 6 is independently selected from -(CR a 2 ) x NRC(0)-, -(CR 2 ) X NRS(0) 2 -, and -(CR a 2)n0(CR a 2 )qNRC(0)-;
- R 9 is independently selected from FI or Ci-6 alkyl
- R 10 is independently selected from: a) - (R 5 - N iel li -R V(R 20 )n -(R 6 ) m -R 12 , b) — (R 20 )n - (R 6 )m- R 5 - N iel li -R 6 -R 12 ,
- R 12 is independently selected from -Cn- 2 o alkyl-R d , -(CR 2 ) x -0-(CR 2 ) x -R d , - Cn- 2 o alkyl-C(0)NR- (CR d 2 ) 2 H, and C2-16 alkenyl;
- R 20 is independently selected from a) -(CR a 2 )tO(CR a 2 ) q O-(CR a 2 )t-, b) -(CR a 2 ) t 0(CR a 2 ) q 0-(CR a 2 ) t -NRC(0)-, c) -(CR a 2 )t0(CR a 2 ) q -NRC(0)-(CR a 2 ) n 0(CR a 2 )n0-, d) -(CR a 2 ) t -NRC(0)-(CR a 2 ) q 0(CR a 2 ) q 0-(CR a 2 )r, e) -(CR a 2 )tO(CR a 2 ) q O-(CR a 2 )r, and f) -(CR a 2 ),-0-(CR a 2 ) q 0(CR a 2 ) q
- the present invention comprises compounds of Formula I, wherein: A is C 2-6 alkyl;
- a 2 is -(CR 2 ) n NRC(0)(CR 2 )n-;
- R is independently selected from H or Ci-6 alkyl
- R a is independently selected from H or -C(0)0R 9 ;
- R b is independently selected from H, Ci- 6 alkyl, or Ci- 6 alkyl-N + (CH 3 ) 2 ; R x is tetrazolyl;
- R d is independently selected from H or -C(0)0R 9 ;
- R 1 is selected from: (a) -(CR2) Z -R X -(CR ) Z NR 2 ,
- R 2 is selected from: (a) -(CR 2 )z-NR b -C(0)R 10 , and
- R 3 is F
- R 5 is independently selected from -(CR a 2 ) x -, -(CR a 2 ) x O(CR a 2 ) x -, and Ci-s alkyl;
- R 6 is independently selected from -(CR a 2 ) x NRC(0)-, -(CR 2 ) x NRS(0) 2 -, and -(CR a 2 ) n 0(CR a 2 ) q NRC(0)-;
- R 9 is independently selected from FI or Ci- 6 alkyl
- R 10 is independently selected from:
- R 12 is independently selected from -Cn- 2 o alkyl-R d , -(CR 2 ) x -0-(CR 2 ) x -R d , - Cn- 2 o alkyl-C(0)NR- (CR d 2 ) 2 H, and C2-16 alkenyl;
- R 20 is independently selected from a) -(CR a 2 ) t O(CR a 2 ) q O-(CR a 2 ) t -, b) -(CR a 2 ) t 0(CR a 2 ) q 0-(CR a 2 ) t -NRC(0)-, c) -(CR a 2 )t0(CR a 2 ) q -NRC(0)-(CR a 2 ) n 0(CR a 2 )n0-, d) -(CR a 2 ) t -NRC(0)-(CR a 2 ) q 0(CR a 2 ) q 0-(CR a 2 ) t -, e) -(CR a 2 )tO(CR a 2 ) q O-(CR a 2 )r, and f) -(CR a 2 ),-0-(CR a 2 ) q 0(CR
- A is selected from C2-6 alkyl, or -(CR 2 ) n R x (CR 2 )n-. In another embodiment of the compounds of Formula I, A is C2-6 alkyl. In a further embodiment, A is -(CH 2 )4-6. In another embodiment, A is -(CR 2 ) n R x (CR 2 ) n -. In an embodiment of the compounds of Formula I, A 2 is selected from
- a 2 is -(O3 ⁇ 4) 2 q( ⁇ 2 ) 2 or (CH 2 ) 4-6 .
- X O or CH 2 .
- a 2 is -(O3 ⁇ 4) 2 q( ⁇ 2 ) 2 or (CH 2 ) 4-6 .
- R 1 is selected from -(CR2) Z -R x - (CR 2 ) Z NR 2 , -(CR2)z -R x -(CR2) z NR-C(0)-(CR2)z[0(CR2)n]r-N + (CH 3 )3, and -(CR ) Z - R x -(CR ) z -NR b - C(0)R 10 .
- R 1 is H; and R 2 is selected from -(CR 2 ) z -NR b -C(0)R 10 and -(CR 2 ) z -NR-C(0)-(CR 2 ) z [0(CR 2 ) n ] r -N + (CH 3 ) 3 .
- R 2 is selected from -(CR 2 ) z -NR-C(0)- (CR 2 ) z [0(CR 2 ) n ] r -N + (CH 3 ) 3 .
- R 2 is -(CR 2 ) z -NR b -C(0)R 10 .
- R 2 is -(CH 2 ) Z -NH-C(0)R 10 .
- R 5 is Ci-s alkyl
- R 6 is -(CR a 2 ) x NRC(0)-. In a further embodiment, R 6 is selected from:
- R 10 is selected from a) -(R 20 )n - (R 6 )m- R 5 - N (CI I 3)2 -R 6 -R 12 , b) - R 20 - N (CI I 3 )2 - (R 6 )m- (R 20 )n - (R 6 )q-R 12 , c) -(R 20 )n- (R 6 ) m -R 12 , d) -(R 20 )n- N + (CH 3 )2 - (R 20 )n - (R 6 )q-R 12 , e) -(R 20 )n-N + (CH 3 )2- (R 6 )q-R 12 , f) — (R 20 )n - (R 6 )m- R 20 - N + (CH 3 )2 -(R 20 ) S - (R 6 )q-R 12 , and g)
- R 10 is selected from a) - R 20 - N (CI I 3 )2 - (R 6 )m- (R 20 )n - (R 6 ) q -R 12 ,
- compounds of Formula I selected from Ex-1, Ex-2, Ex-3, Ex-4, Ex-
- An embodiment of the invention comprises compounds selected from Ex-7, Ex-9, Ex- 11 , and Ex- 13, or a pharmaceutically acceptable salt thereof.
- the compounds shown below in Table 1 are also referred to herein as “compounds of the invention”.
- the * denotes that the compound includes “A-”, which represents any pharmaceutically acceptable counter ion, including those depicted in the experimental section.
- salts of compounds of the invention includes any of the following: acidic salts formed with inorganic and/or organic acids, basic salts formed with inorganic and/or organic bases, zwitterionic and quaternary ammonium complexes.
- Salts of compounds of the invention may be formed by methods known to those of ordinary skill in the art, for example, by reacting a compound of the invention with an amount of acid or base, such as an equivalent amount, in a medium such as one in which the salt precipitates or in aqueous medium followed by lyophilization.
- a pharmaceutically acceptable salt of the compounds of Table 1 may be different from the compound associated with a counter ion (A-).
- Compounds of the invention contain tri-coordinate nitrogen atoms, for example, primary, secondary or tertiary amino moieties, wherein, as is known, the lone pair of electrons residing on the nitrogen atom may be protonated with an appropriate acid or alkylated with an appropriate reagent, for example, alkyl bromide, under the appropriate reaction conditions to provide tetracoordinate charged nitrogen stabilized by an anion generated in the process, for example, a halogen ion or conjugate base. Accordingly, compounds of the invention may be prepared in the form of a free- base or isolated in the form of a quaternary complex or a salt complex.
- salts of the inventive compounds are included in the scope of the invention, whether acidic salts formed with inorganic and/or organic acids, basic salts formed with inorganic and/or organic bases, salts formed which include zwitterionic character (for example, where a compound contains both a basic moiety, for example, but not limited to, a nitrogen atom, for example, an amine, pyridine or imidazole, and an acidic moiety, for example, but not limited to a carboxylic acid), and quaternary ammonium complexes.
- structural representation of compounds of the invention also include all other forms of such compounds discussed above.
- one aspect of the invention is the provision of compounds of the invention in the form of a pharmaceutically acceptable salt, zwitterionic complex or quaternary ammonium complex.
- the compounds of the invention may form such complexes, including where a tetracoordinate nitrogen can be quatemized or protonated and the charged nitrogen form stabilized by an associated anion.
- pharmaceutically acceptable salt refers to a salt (including a quaternary ammonium complex and an inner salt such as a zwitterion complex) which possesses effectiveness similar to or greater than a free-base form of the compound and which is not biologically or otherwise undesirable (e.g ., is neither toxic nor otherwise deleterious to the recipient thereof).
- the present invention contemplates both freebase forms of the compounds of the invention and all available salts, including salts which are generally recognized as safe for use in preparing pharmaceutical formulations and those which may be formed presently within the ordinary skill in the art and are later classified as being “generally recognized as safe” for use in the preparation of pharmaceutical formulations, termed herein as “pharmaceutically acceptable salts”.
- freebase compounds may be prepared by controlling the conditions of isolation of the compound during synthesis or by neutralization and ion exchange from salt forms of compounds of the invention.
- Examples of pharmaceutically acceptable acid salts include, but are not limited to, acetates, including trifluoroacetate salts, adipates, alginates, ascorbates, aspartates, benzoates, benzenesulfonates, bisulfates, borates, butyrates, citrates, camphorates, camphorsulfonates, cyclopentanepropionates, digluconates, dodecylsulfates, ethanesulfonates, fumarates, glucoheptanoates, glycerophosphates, hemisulfates, heptanoates, hexanoates, hydrochlorides, hydrobromides, hydroiodides, 2-hydroxyethanesulfonates, lactates, maleates, methanesulfonates, methyl sulfates, 2-naphthalenesulfonates, nicotinates, nitrates, oxalates
- Examples of pharmaceutically acceptable basic salts include, but are not limited to, ammonium salts, alkali metal salts such as sodium, lithium, and potassium salts, alkaline earth metal salts such as calcium and magnesium salts, aluminum salts, zinc salts, salts with organic bases (for example, organic amines) such as benzathines, diethylamine, dicyclohexylamines, hydrabamines (formed with N,N-bis(dehydroabietyl)ethylenediamine), N-methyl-D-glucamines, N-methyl-D- glucamides, t-butyl amines, piperazine, phenylcyclohexyl-amine, choline, tromethamine, and salts with amino acids such as arginine, lysine and the like.
- organic bases for example, organic amines
- organic bases for example, organic amines
- Basic nitrogen-containing groups may be converted to an ammonium ion or quatemized with agents such as lower alkyl halides (e.g. methyl, ethyl, propyl, and butyl chlorides, bromides and iodides), dialkyl sulfates (e.g. dimethyl, diethyl, dibutyl, and diamyl sulfates), long chain halides (e.g. decyl, lauryl, myristyl and stearyl chlorides, bromides and iodides), aralkyl halides (e.g. benzyl and phenethyl bromides), and others.
- lower alkyl halides e.g. methyl, ethyl, propyl, and butyl chlorides, bromides and iodides
- dialkyl sulfates e.g. dimethyl, diethyl, dibutyl, and diamyl
- salts of compounds are intended to be pharmaceutically acceptable salts within the scope of the invention.
- purified refers to the physical state of said compound after being isolated from a synthetic process or natural source or combination thereof.
- purified refers to the physical state of said compound after being obtained from a purification process or processes described herein or well known to the skilled artisan, and in sufficient purity to be characterized by standard analytical techniques described herein or well known to the skilled artisan.
- Compounds of the invention include any form of the compound including in situ in a reaction mixture as well as in isolated and purified form obtained by routine techniques. Also included are polymorphic forms of the compounds of the invention and solvates and prodrugs thereof.
- Certain compounds of the invention may exist in different tautomeric forms, for example, but are not limited to, ketone/enol tautomeric forms, imine-enamine tautomeric forms, and for example heteroaromatic forms such as the following moieties:
- the present invention provides pharmaceutical compositions comprising one or more compounds of the invention.
- pharmaceutical composition comprises at least one pharmaceutically active compound and at least one excipient, and is intended to encompass both the combination of the specified ingredients in the specified amounts, and any product which results, directly or indirectly, from combination of the specified ingredients in the specified amounts.
- excipients are any constituent which adapts the composition to a particular route of administration or aids the processing of a composition into a dosage form without itself exerting an active pharmaceutical effect.
- compositions comprise more than one excipient depending upon the route of administration and the characteristics of the active being administered.
- excipients which impart to the composition properties which make it easier to handle or process include, but are not limited to, lubricants or pressing aids in powdered medicaments intended to be tableted, and emulsion stabilizers in compositions in which the active is present in the form of an emulsion.
- excipients which adapt a composition to a desired route of administration are, for example, but not limited to, for oral administration, absorption enhancers promoting absorption from the gastrointestinal tract, for transdermal or transmucosal administration, penetration enhancers, for example, those employed in adhesive skin "patch” or compositions for buccal administration.
- excipients are collectively termed herein "a carrier".
- formulations may comprise up to about 95 percent active ingredient and the balance carrier, although formulations with different ratios may be prepared.
- acceptable pharmaceutical compositions contain a suitable concentration of the active that an effective amount of the PCSK9 antagonist can be provided in an individual dosage form of acceptable volume based upon the route of administration such that it can provide a therapeutic serum level of the active for an acceptable period of time in a subject to whom the composition is administered and the composition will retain biological activity during storage within an acceptable temperature range for an acceptable period of time.
- composition refers both to a bulk composition, that is, formulated material that has not yet been formed into individual dosage units for administration, and the composition contained within individual dosage units.
- compositions of the invention may be employed in bulk form, it will be appreciated that for most applications compositions will be incorporated into a dosage form providing individual units suitable for administration to a patient, each dosage form comprising an amount of the selected composition which contains an effective amount of said one or more compounds of Formula I.
- suitable dosage forms include, but are not limited to, dosage forms adapted for: (i) oral administration, e.g., a liquid, gel, powder, solid or semi-solid pharmaceutical composition which is loaded into a capsule or pressed into a tablet and may comprise additionally one or more coatings which modify its release properties, for example, coatings which impart delayed release or formulations which have extended release properties; (ii) a dosage form adapted for administration through tissues of the oral cavity, for example, a rapidly dissolving tablet, a lozenge, a solution, a gel, a sachet or a needle array suitable for providing intramucosal administration; (iii) a dosage form adapted for administration via the mucosa of the nasal or upper respiratory cavity, for example a solution, suspension or emulsion formulation for dispersion in the nose or airway; (iv) a dosage form adapted for transdermal administration, for example, a patch, cream or gel; (v) a dosage form adapted for intradermal administration, for example,
- a dosage form adapted for intramuscular administration for example, an injectable solution or suspension, and which may be adapted to form a depot having extended release properties
- a dosage form adapted for drip intravenous administration for example, a solution or suspension, for example, as an IV solution or a concentrate to be injected into a saline IV bag
- IV drip intravenous administration
- a dosage form adapted for subcutaneous administration including administration over an extended time period by implanting a rod or other device which diffuses the compound into the surround tissue and thereby provides a continuous serum therapeutic level
- a dosage form adapted for delivery via rectal or vaginal mucosa for example, a suppository.
- compositions can be solid, semi-solid or liquid.
- Solid, semi-solid and liquid form preparations can be adapted to a variety of modes of administration, examples of which include, but are not limited to, powders, dispersible granules, mini-tablets, beads, which can be used, for example, for tableting, encapsulation, or direct administration.
- liquid form preparations include, but are not limited to, solutions, suspensions and emulsions which for example, but not exclusively, can be employed in the preparation of formulations intended for ingestion, inhalation or intravenous administration (IV), for example, but not limited to, administration via drip IV or infusion pump, intramuscular injection (IM), for example, of a bolus which is released over an extended duration, direct IV injection, or adapted to subcutaneous routes of administration.
- IV intravenous administration
- IM intramuscular injection
- routes of administration which may be contemplated include intranasal administration, or for administration to some other mucosal membrane.
- Formulations prepared for administration to various mucosal membranes may also include additional components adapting them for such administration, for example, viscosity modifiers.
- compositions suitable for use in a solid oral dosage form are preferable routes of administration for a compound of the invention or a salt thereof
- a composition of the invention may be formulated for administration via other routes mentioned above.
- aerosol preparations for example, suitable for administration via inhalation or via nasal mucosa
- solid form preparations which are intended to be converted, shortly before use, to a suspension or a solution, for example, for oral or parenteral administration. Examples of such solid forms include, but are not limited to, freeze dried formulations and liquid formulations adsorbed into a solid absorbent medium.
- the compounds of the invention may also be deliverable transdermally or transmucosally, for example, from a liquid, suppository, cream, foam, gel, or rapidly dissolving solid form.
- transdermal compositions can take also the form of creams, lotions, aerosols and/or emulsions and can be provided in a unit dosage form which includes a transdermal patch of any know in the art, for example, a patch which incorporates either a matrix comprising the pharmaceutically active compound or a reservoir which comprises a solid or liquid form of the pharmaceutically active compound. Examples of pharmaceutically acceptable carriers and methods of manufacture for various compositions mentioned above may be found in A.
- compositions may be formulated by any number of strategies known in the art, see, e.g., McGoff and Scher, 2000 Solution Formulation of Proteins/Peptides: In - McNally, E J., ed. Protein Formulation and Delivery. New York, NY: Marcel Dekker; pp. 139-158; Akers & Defilippis, 2000, Peptides and Proteins as Parenteral Solutions. In - Pharmaceutical Formulation Development of Peptides and Proteins. Philadelphia, PA: Taylor and Francis; pp. 145-177; Akers et ai, 2002, Pharm. Biotechnol. 14:47-127.
- the present invention provides methods of employing PCSK9-specific antagonist compounds described herein for antagonizing PCSK9 function; said methods of which are further described below.
- antagonistizing throughout the present application refers to providing to the affected tissue(s) a substance which opposes the action of, inhibits, counteracts, neutralizes or curtails one or more functions of PCSK9 in the affected tissues.
- Inhibition or antagonism of one or more of PCSK9-associated functional properties can be readily determined according to methodologies known to the art (see, e.g., Barak & Webb, 1981 J. Cell Biol. 90:595- 604; Stephan & Yurachek, 1993 ./. Lipid Res.
- a PCSK9-specific antagonist in accordance with the present invention antagonizes PCSK9 functioning to the point that there is a decrease of at least 10%, of the measured parameter including but not limited to the activities disclosed herein, and more preferably, a decrease of at least 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95% of the measured parameter.
- Such inhibition/antagonism of PCSK9 functioning is particularly effective in those instances where PCSK9 functioning is contributing at least in part to a particular phenotype, disease, disorder or condition which is negatively impacting the subject.
- the present invention provides a method for antagonizing the activity of PCSK9, which comprises contacting a cell, population of cells or tissue sample capable of being affected by PCSK9 (i.e., which expresses and/or comprises LDL receptors) with a PCSK9-specific antagonist disclosed herein under conditions that allow said antagonist to bind to PCSK9 when present and inhibit PCSK9's inhibition of cellular LDL uptake.
- a cell i.e., which expresses and/or comprises LDL receptors
- a PCSK9-specific antagonist disclosed herein under conditions that allow said antagonist to bind to PCSK9 when present and inhibit PCSK9's inhibition of cellular LDL uptake.
- the cell is a human cell.
- additional embodiments of the present invention include such methods wherein the cell is a murine cell.
- the present invention provides a method for antagonizing the activity of PCSK9 in a subject, which comprises administering to the subject a therapeutically effective amount of a PCSK9-specific antagonist of the present invention.
- the methods for antagonizing PCSK9 function are for the treatment, as defined herein, of a PCSK9-associated disease, disorder or condition or, alternatively, for providing therapy in a disease, disorder or condition that could benefit from the effects of a PCSK9 antagonist.
- the present invention contemplates the use of PCSK9-specific antagonists described herein in various methods of treatment where antagonizing PCSK9 function is desirable.
- the term “method of treatment” relates to a course of action resulting in a change in at least one symptom of a disease state which can be prophylactic or therapeutic in nature.
- the present invention relates to a method of treatment for a condition associated with and/or attributed to PCSK9 activity, or a condition where the functioning of PCSK9 is contraindicated for a particular subject, the method comprising administering to the subject a therapeutically effective amount of a PCSK9- antagonist compound of Formula I, or pharmaceutically acceptable salt thereof.
- the condition may be atherosclerosis, hypercholesterolemia, coronary heart disease, metabolic syndrome, acute coronary syndrome or related cardiovascular disease and cardiometabolic conditions, or may be a disease state or condition in which PCSK9 activity is contraindicated.
- Methods of treatment in accordance with the present invention comprise administering to an individual a therapeutically (or prophylactically) effective amount of a PCSK9-specific antagonist of the present invention.
- a therapeutically (or prophylactically) effective amount of a PCSK9-specific antagonist of the present invention refers to the amount necessary at the intended dosage to achieve the desired therapeutic and/or prophylactic effect for the period of time desired.
- the desired effect may be, for example, the alleviation, amelioration, reduction or cessation of at least one symptom associated with the treated condition.
- These amounts will vary, as the skilled artisan will appreciate, according to various factors, including but not limited to the disease state, age, sex, and weight of the individual, and the ability of the PCSK9-specific antagonist to elicit the desired effect in the individual.
- the response may be documented by in vitro assay, in vivo non- human animal studies, and/or further supported from clinical trials.
- a PCSK9 antagonist compound of the invention in the form of a pharmaceutical composition as described herein.
- Dosing of antagonist therapeutics is well within the realm of the skilled artisan, see, e.g., Lederman et ai, 1991 hit. J. Cancer 47:659-664; Bagshawe et ai, 1991 Antibody,
- Immunoconjugates and Radiopharmaceuticals 4:915-922 will vary based on a number of factors, for example, but not limited to, those mentioned above, including the condition of the patient, the area being treated, the route of administration, and the treatment desired, for example, prophylaxis or acute treatment and the like.
- a physician or veterinarian of ordinary skill can readily determine and prescribe the effective therapeutic amount of the antagonist.
- the subject may be in need of, or desire, treatment for an existing disease or medical condition.
- the subject "in need” of treatment of an existing condition encompasses both a determination of need by a medical professional as well as the desire of the subject for such treatment.
- "administration" and its variants are each understood to include provision of the compound or its salt and the other agents contemporaneously or simultaneously or over a course of separate administrations over a period of time.
- the agents of a combination are administered at the same time, they can be administered together in a single composition or they can be administered separately.
- a "combination" of active agents can be a single composition containing all of the active agents or multiple compositions each containing one or more of the active agents.
- a combination can be either a single composition comprising both agents or two separate compositions each comprising one of the agents; in the case of three active agents a combination can be either a single composition comprising all three agents, three separate compositions each comprising one of the agents, or two compositions one of which comprises two of the agents and the other comprises the third agent; and so forth.
- compositions and combinations of the present invention are suitably administered in effective amounts.
- effective amount means the amount of active compound sufficient to antagonize PCSK9 and thereby elicit the response being sought (i.e ., induce a therapeutic response in the treatment or management of conditions associated with or impacted by PCSK9 function, including, but not limited to atherosclerosis, hypercholesterolemia, coronary heart disease, metabolic syndrome, acute coronary syndrome, and related cardiovascular disease and cardiometabolic conditions in an animal or human).
- the actual dosage employed may be varied depending upon the requirements of the patient and the severity of the condition being treated. Determination of the proper dosage regimen for a particular situation is within the skill in the art, for example, as described in the standard literature, for example, as described in the “Physicians’ Desk Reference” (PDR), e.g., 1996 edition (Medical Economics Company, Montvale, NJ 07645-1742, USA), the Physician’s Desk Reference, 56 th Edition, 2002 (published by Medical Economics company, Inc. Montvale, NJ 07645-1742), or the Physician’s Desk Reference, 57 th Edition, 2003 (published by Thompson PDR, Montvale, NJ 07645- 1742); the disclosures of which is incorporated herein by reference thereto.
- the total daily dosage may be divided and administered in portions during the day as required or delivered continuously.
- the PCSK9-specific antagonist may be administered to an individual by any route of administration appreciated in the art, including but not limited to oral administration, administration by injection (specific embodiments of which include intravenous, subcutaneous, intraperitoneal or intramuscular injection), or administration by inhalation, intranasal, or topical administration, either alone or in combination with other agents designed to assist in the treatment of the individual.
- the PCSK9-specific antagonist may also be administered by injection devices, injector pens, needleless devices; and subcutaneous patch delivery systems.
- the route of administration should be determined based on a number of considerations appreciated by the skilled artisan including, but not limited to, the desired physiochemical characteristics of the treatment.
- One or more additional pharmacologically active agents may be administered in combination with a compound of Formula I.
- An additional active agent is intended to mean a pharmaceutically active agent (or agents) that is active in the body, including pro-drugs that convert to pharmaceutically active form after administration, which are different from the compound of Formula I, and also includes free-acid, free-base and pharmaceutically acceptable salts of said additional active agents.
- any suitable additional active agent or agents including but not limited to anti-hypertensive agents, anti-atherosclerotic agents such as a lipid modifying compound, anti-diabetic agents and/or anti-obesity agents may be used in any combination with the compound of Formula I in a single dosage formulation (a fixed dose drug combination), or may be administered to the subject in one or more separate dosage formulations which allows for concurrent or sequential administration of the active agents (co-administration of the separate active agents).
- angiotensin converting enzyme inhibitors e.g., alacepril, benazepril, captopril, ceronapril, cilazapril, delapril, enalapril, enalaprilat, fosinopril, imidapril, lisinopril, moveltipril, perindopril, quinapril, ramipril, spirapril, temocapril, or trandolapril), angiotensin II receptor antagonists (e.g., losartan i.e., COZAAR®, valsartan, candesartan, olmesartan, telmesartan and any of these drugs used in combination with hydrochlorothiazide such as HYZAAR®); neutral endopeptidase inhibitors (e.g., thiorphan and phosphoramidon), al
- angiotensin converting enzyme inhibitors e
- Patent 5,114,937 di- and tri-peptide derivatives, peptidyl amino diols and peptidyl beta- aminoacyl aminodiol carbamates, and small molecule renin inhibitors (including diol sulfonamides and sulfinyls), N-morpholino derivatives, N-heterocyclic alcohols and pyrolimidazolones; also, pepstatin derivatives and fhioro- and chloro-derivatives of statone-containing peptides, enalkrein, RO 42-5892, A 65317, CP 80794, ES 1005, ES 8891, SQ 34017, aliskiren (2(S),4(S),5(S),7(S)-N-(2- carbamoyl-2-methylpropyl)-5-amino-4-hydroxy-2,7-diisopropyl-8-[4-methoxy-3-(3- methoxypropoxy)-phenyl
- sildenafil, tadalfil and vardenafil vasodilators
- calcium channel blockers e.g., amlodipine, nifedipine, verastrial, diltiazem, gallopamil, niludipine, nimodipins, nicardipine
- potassium channel activators e.g., nicorandil, pinacidil, cromakalim, minoxidil, aprilkalim, loprazolam
- diuretics e.g., hydrochlorothiazide
- sympatholitics e.g., beta-adrenergic blocking drugs (e.g., propranolol, atenolol, bisoprolol, carvedilol, metoprolol, or metoprolol tartate), alpha adrenergic blocking drugs (e.g., doxazocin, prazocin or alpha methyldo
- lipid lowering agents e.g., HMG-CoA reductase inhibitors such as simvastatin and lovastatin which are marketed as ZOCOR® and MEVACOR® in lactone pro-drug form and function as inhibitors after administration, and pharmaceutically acceptable salts of dihydroxy open ring acid HMG-CoA reductase inhibitors such as atorvastatin (particularly the calcium salt sold in LIPITOR®), rosuvastatin (particularly the calcium salt sold in CRESTOR®), pravastatin (particularly the sodium salt sold in PRAVACHOL®), fluvastatin (particularly the sodium salt sold in LESCOL®), crivastatin, and pitavastatin; a cholesterol absorption inhibitor such as ezetimibe (ZETIA®) and ezetimibe in combination with any other lipid lowering agents such as the HMG-CoA reductase inhibitors noted above and particularly with simvastatin (VYTORIN®) or with atorvastatin
- PPARa/g dual agonists e.g., ZYH2, ZYH1, GFT505, chiglitazar, muraglitazar, aleglitazar, sodelglitazar, and naveglitazar
- PPARa agonists such as fenofibric acid derivatives (e.g., gemfibrozil, clofibrate, ciprofibrate, fenofibrate, bezafibrate)
- SPPARyM selective PPARy modulators
- Patent No. 6,730,690, and LY-2523199 CETP inhibitors (e.g., anacetrapib, torcetrapib, and evacetrapib); inhibitors of fructose 1,6-bisphosphatase, (e.g., such as those disclosed in U.S. Patent Nos.
- the compounds of the present invention can be readily prepared according to the following reaction schemes and examples, or modifications thereof, using readily available starting materials, reagents and conventional synthesis procedures. In these reactions, it is also possible to make use of known variants. For purification of the compounds using reverse phase chromatography (either HPLC or MPLC, as noted below), a C 18 column was used. Other methods for preparing compounds of the invention will be readily apparent to the person of ordinary skill in the art in light of the following reaction schemes and examples. Abbreviations listed below may be used in the exemplary schemes and/or examples herein.
- ACN is acetonitrile; AcOH is acetic acid; Boc is t-butoxycarbonyl; B0C2O is di-tert-butyl dicarbonate; BnBr is benzyl bromide; BzCl is benzoyl chloride; CBr4 is perbromomethane or tetrabromomethane; Cbz-Cl is benzyl chloroformate; Cbz-OSu is is N- (benzyloxycarbonyloxy)succinimide; CD3OD is deuterated methanol; CDCI3 is deuterated chloroform; CS2CO3 is cesium carbonate; DCC is N,N'-Dicyclohexylcarbodiimide; DCE is 1,2- dichloroethane; DCM is dichloromethane; D-Dap(Boc)-OMe is methyl (S)-2-amino-3-((tert- butoxycarbonyl)amino)prop
- S-Phos is 2-dicyclohexylphosphino-2',6'- dimethoxybiphenyl
- TBAB is tetrabutylammonium bromide
- TBAF is tetrabutylammonium fluoride
- TBAHS is tetrabutylammonium hydrogenosulfate
- TEA is triethylamine
- TFA is trifluoroacetic acid
- THF is tetrahydrofuran
- Tf20 is trifluoromethanesulfonic anhydride
- the compounds of the present invention can be readily prepared according to the following reaction schemes and examples, or modifications thereof, in conjunction with readily available starting materials, reagents and conventional synthesis procedures. Alternate salt forms for products and intermediates may also be present in the invention. Alternate methods for preparing compounds of the invention will be readily apparent to the person of ordinary skill in the art in light of the following reaction schemes and examples. For example, in these reactions it is possible to make use of known variants. Immediately following is a section describing the preparation of intermediates useful in the preparation of example compounds of the invention. Unless otherwise noted, reagents used in the preparation of intermediates and examples are commercially available or can be prepared by known methods.
- Step A (R)-tert-butyl 3-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-2- (((benzyloxy)carbonyl)amino)propanoate A-1
- Step B (S)-tert-butyl 4-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-2-aminobutanoate hydrochloride A-2
- Step C (S)-l-((S)-2-((2S,3R)-3-(tert-butoxy)-2-((tert-butoxycarbonyl)amino)butanamido)-3-(4- methoxyphenyl)propanoyl)-2-methylpyrrolidine-2-carboxylic acid
- 2 (2.95 g, 6.18 mmol) in THF (30 mL) was added 2 M LiOH (12.4 mL, 24.7 mmol) at room temperature.
- the reaction mixture was stirred at 45 °C for 48 h.
- the reaction mixture was cooled to 0 °C and added 1 M HC1 (24.7 mL).
- the above mixture were added NaHCCL (2.07 g, 24.9 mmol) and B0C2O (2.86 mL, 12.3 mmol) at 0 °C.
- the mixture was stirred at room temperature for 16 h.
- the mixture was added 1 M HC1 (25 mL) at 0 °C, extracted with EA (100 mL).
- the organic layer was washed with brine (50 x 2 mL), dried over anhydrous MgSCL and filtered.
- the filtrate was concentrated under reduced pressure.
- Step A Tert-butyl (2-(3-oxoisoindolin-5-yl)ethyl)carbamate B-1
- Step D Tert-butyl 6-(2-(((benzyloxy)carbonyl)amino)ethyl)-l-oxoisoindoline-2-carb oxylate B-4
- Step E 5-(2-(((benzyloxy)carbonyl)amino)ethyl)-2-(((tert-butoxycarbonyl)amino)methy l)benzoic acid B-5
- Step F Benzyl (4-(((tert-butoxycarbonyl)amino)methyl)-3-(hydroxymethyl)phenethyl) carbamate
- Step G Tert-butyl 4-(2-aminoethyl)-2-(hydroxymethyl)benzylcarbamate B-7 To a solution of benzyl (4-( ( ( fe/7-butoxycarbonyl )am i no )methyl )-3-
- Step FI (9H-fluoren-9-yl)methyl (4-(((tert-butoxycarbonyl)amino)methyl)-3-(hydroxyl methyl)phenethyl)carbamate B-8
- Step I 5-(2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)ethyl)-2-(((tert-butoxycarbon yl) amino)methyl)benzyl methanesulfonate B-9
- Step J (9H-fluoren-9-yl)methyl (3-(azidomethyl)-4-(((tert-butoxycarbonyl)amino)methyl) phenethyl)carbamate B-10
- Step L Ethyl 7-((4-(2-(((((9H-fluoren-9-yl)methoxy)carbonyl)amino)ethyl)-2- (azidomethyl)benzyl)amino)-7-oxoheptanoate B-12
- Step M Ethyl 7-((4-(2-aminoethyl)-2-(azidomethyl)benzyl)amino)-7-oxoheptanoate B
- ethyl 7-((4-(2-((((9F -fluoren-9-yl)methoxy)carbonyl)amino)ethyl)-2- (azidomethyl)benzyl)amino)-7-oxoheptanoate B-12 (5.00 g, 8.37 mmol) in DCM (20 mL) were added ACN (20 mL), piperidine (3.56 g, 41.8 mmol) at 0 °C.
- Step C (2S,3S)-l-(tert-butoxycarbonyl)-3-hydroxypyrrolidine-2-carboxylic acid C-3
- DCM N-(2-aminoethyl)-2-carboxylic acid
- DIEA 24.0 mL, 137 mmol
- B0C2O 17.5 mL, 75 mmol
- the reaction solution was extracted with aq. NaOH (100 mL, 1M).
- the aqueous phase was cooled to 0°C.
- the pH value of the aqueous phase was adjusted to 2 with aqueous HC1 (1 M).
- the aqueous phase was extracted with 2-Me-THP (100 mL).
- the aqueous phase was re-acidified and extracted with 2-Me-THP (100 mL).
- the combined organic layer was dried over anhydrous MgSCL and filtered.
- the filtrate was concentrated under reduced pressure.
- the residue was dissolved in MTBE (200 mL) and stirred at room temperature for 2 h. The solid was filtered and washed with MTBE to give (25 , ,3S)-l-(tert- butoxycarbonyl)-3-hydroxypyrrolidine-2-carboxylic acid C-3.
- Step D ( S)-2-amino-3-(3-(2-(tert-butoxy)-2-oxoethyl)phenyl)propanoic acid C-4
- Step E (2S,3S) 1-tert-butyl 2-methyl 3-(allyloxy)pyrrolidine- 1 ,2-dicarboxylate C-5
- DMF dimethyl sulfoxide
- NaHC(3 ⁇ 4 930 mg, 11.1 mmol
- Mel 1.73 mL, 27.6 mmol
- the reaction solution was diluted with water (120 mL), extracted with MTBE (2 x 200 mL).
- Step F (2 S, 3 S) -methyl 3-(allyloxy)pyrrolidine-2-carboxylate hydrochloride C-6
- Step G (2 S, 3 S) -methyl 3-(allyloxy)-l-((S)-2-((tert-butoxycarbonyl)amino)-3-(5-fluoro-lH-indol-3- yl)propanoyl)pyrrolidine-2-carboxylate C- 7
- Step H (2 S, 3 S) -methyl 3-(allyloxy)-l-((S)-2-amino-3-(5-fluoro-lH-indol-3- yl)propanoyl)pyrrolidine-2-carboxylate hydrochloride C-8
- Step I (2 S, 3 S) -methyl 3-(allyloxy)-l-((S)-2-((S)-3-(3-allylphenyl)-2-((tert- butoxycarbonyl)amino)propanamido)-3-(5-fluoro-lH-indol-3-yl)propanoyl)pyrrolidine-2- carboxylate C-9
- the mixture was stirred at rt. for 1 h.
- the reaction solution was diluted with water (20 mL), extracted with EA (20 mL).
- the organic layer was washed with brine (2 x 10 mL), dried over anhydrous MgSCL and filtered.
- the filtrate was concentrated under reduced pressure.
- the residue was purified by silica gel column chromatography, eluted with gradient 1 % - 60% EA in PE.
- Step J Methyl (12S,13S,9S,12S,E)-9-((tert-butoxycarbonyl)amino)-12-((5-fluoro-lH-indol-3- yl)methyl)-l 0, 13-dioxo-2-oxa-l 1-aza-l (3,1 )-pyrrolidina-7 (1 , 3)-benzenacyclotridecaphan-4-ene-12- carboxylate C-10
- Step K Methyl (12S,13S,9S,12S,E)-9-((tert-butoxycarbonyl)amino)-12-((5-fluoro-l-(prop-2-yn-l- yl)-lH-indol-3-yl)methyl)-l 0, 13-dioxo-2-oxa-l 1-aza-l (3, 1 )-pyrrolidina- 7(1, 3)- benzenacyclotridecaphan-4-ene-12-carboxylate C-ll
- the mixture was stirred at 40 °C for 16 h.
- the reaction was cooled to rt. and poured into 10 mL of 50% sat brine / 10% citric acid solution, extracted with EA (2 x 10 mL).
- the organic layer was washed with brine (2 x 10 mL), dried over anhydrous MgSCE and filtered.
- the filtrate was concentrated under reduced pressure.
- the residue was purified by silica gel column chromatography, eluted with gradient 1% - 60% EA in PE.
- Step L (12S,13S,9S,12S,E)-9-((tert-butoxycarbonyl)amino)-12-((5-fluoro-l-(prop-2-yn-l-yl)-lH- indol-3-yl)methyl)-10, 13-dioxo-2-oxa-l 1 -aza-1 (3, l)-pyrrolidina- 7(1, 3)-benzenacyclotridecaphan-4- ene-12-car boxy lie acid C
- the reaction mixture was stirred at room temperature for 3 h.
- the reaction was partitioned with pH 4 Phosphate buffer (1M KH2PO4, 30 mF), extracted with EA (50 mF).
- the organic layer was washed with brine (2 x 50 mF), dried over anhydrous MgSCfi and filtered. The filtrate was concentrated under reduced pressure.
- Step A (S)-2-benzyl 1-tert-butyl 2-methylpyrrolidine-l ,2-dicarboxylate F-1
- DMF 50 mL
- NaHCCL 7.33 g, 87 mmol
- BnBr 7.77 mL, 65.4 mmol
- Step B (S)-benzyl 2-methylpyrrolidine-2-carboxylate hydrochloride F-2
- (.S ' )-2-bcnzyl 1 -fe/7-butyl 2-methylpyrrolidine- 1 ,2-dicarboxylate F-l(6.10 g, 19.1 mmol) in THF (10 mL) was added 4 M HC1 in dioxane (50 mL) at room temperature.
- the reaction solution was stirred at room temperature for 2 h.
- the resulting solution was concentrated under reduced pressure to afford (S)-bcnzyl 2-methylpyrrolidine-2-carboxylate hydrochloride F-2.
- LCMS (ESI) calc’d for Ci 3 Hi 8 ClN0 [M - HC1 + H] + : 220.1, found 220.1.
- reaction solution was extracted with EA (2 x 200 mL) and the combined organic layer was washed with brine (3 x 400 mL), dried over anhydrous Na SCL and filtered. The residue was purified by silica gel column chromatography eluted with gradient 0% - 60% EA in PE to afford F-3.
- Step B Preparation of intermediate 1-2
- Step D Preparation of intermediate 1-4
- Step F Preparation of intermediate 1-6
- Step I Preparation of intermediate 1-9
- Pd/C 5 mg, 4.70 m mol, dry, 10% wt
- the reaction solution was filtered and the filtrate was concentrated under reduced pressure.
- the residue was re-dissolved in ACN (5 mL) and water (5 mL), added 1 M HC1 (28 pL) and lyophilized to afford 1-9.
- LCMS (ESI) calc’d for C83H109CIFN17O16 [M - HC1 + H] + : 1618.8, found 1619.8.
- reaction solution was quenched with water (100 gL) and purified Flash (Column: Flash C 18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2%
- Step C Methyl 3-(3-((4-(2-((tert-butoxycarbonyl)amino)ethyl)benzyl)(pent-4-en-l-yl) amino)-3- oxopropoxy)propanoate K-3
- Step D Methyl 3-(3-((4-(2-aminoethyl)benzyl)(pent-4-en-l-yl)amino)-3-oxopropoxy)propanoate hydrochloride
- Step A Tert-butyl 3-(2-(2-hydroxyethoxy)ethoxy)propanoate M-l
- Step B Tert-butyl 3-(2-(2-bromoethoxy)ethoxy)propanoate M-2
- Step D Methyl 3-(2-(2-bromoethoxy)ethoxy)propanoate and methyl 3-(2-(2- iodoethoxy)ethoxy)propanoate (1:1) M-4
- Step E Methyl 2,2,8-trimethyl-4-oxo-3,l 1 ,14-trioxa-5,8-diazaheptadecan-l 7-oate M-5
- methyl 3-(2-(2-bromoethoxy)ethoxy)propanoate compound with methyl 3-(2-(2- iodoethoxy)ethoxy)propanoate M-4 (1:1) (400.0 mg, 1.436 mmol) in EtOH (4 mL) was added tert- butyl (2-(methylamino)ethyl)carbamate (1251 mg, 7.18 mmol) at RT. The mixture was stirred at RT for 16 h.
- Step F 2-((T ert-butoxycarbonyl)amino)-N-(2-(2-(3-methoxy-3-oxopropoxy)ethoxy)ethyl)-N,N- dimethylethanaminium iodide M-6
- Step G 2-amino-N-(2-(2-(3-methoxy-3-oxopropoxy)ethoxy)ethyl)-N,N-dimethylethanaminium chloride hydrochloride M
- Step A (S)-methyl 5-(tert-butoxycarbonyl)-3 ,8-dioxo-l -phenyl-2, 12, 15-trioxa-4,9-diazaheptadecan- 17-oate N-1
- Step B (S)-tert-butyl 2-amino-5-((2-(2-(2-methoxy-2-oxoethoxy)ethoxy)ethyl)amino)-5- oxopentanoate N
- (S)-mcthyl 5-(fe/7-butoxycarbonyl)-3,8-dioxo- 1 -phenyl-2, 12, 15-trioxa-4,9- diazaheptadecan-17-oate N-l (9 g, 18.13 mmol) in THF (150 mL) was added Pd/C (900 mg, 0.846 mmol, dry, 10% wt) at room temperature under nitrogen atmosphere.
- Step A Methyl 2,2-dimethyl-4,13-dioxo-3,8,ll,17,20-pentaoxa-5,14-diazadocosan-22-oate la
- 2,2-dimethyl-4-oxo-3,8,ll-trioxa-5-azatridecan-13-oic acid (3.33 g, 12.6 mmol) in DMF (30 mL) were added methyl 2-(2-(2-aminoethoxy)ethoxy)acetate hydrochloride (2.70 g, 12.6 mmol), FIATU (4.80 g, 12.6 mmol) and DIEA (6.53 g, 50.5 mmol) at 0 °C.
- Step B Methyl 17-amino-10-oxo-3,6,12,15-tetraoxa-9-azaheptadecan-l-oate hydrochloride lb
- Step C (S)-23-tert-butyl 1-methyl 22-(((benzyloxy)carbonyl)amino)-10,19-dioxo-3,6,12,l 5- tetraoxa-9,18-diazatricosane-l ,23-dioate lc
- Step D (S)-23-tert-butyl 1 -methyl 22-amino-l 0, 19-dioxo-3,6, 12, 15-tetraoxa-9, 18-diazatricosane- 1 ,23-dioate Id
- Step G Synthesis of intermediate lg
- Example 1 5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mF), followed by 20% ACN in water (2 x 10 mF). A solution of 11 (14 mg, 5.20 pmol) in 60% ACN in water (20 mF) was loaded onto the resin column, and the column was eluted with 60% ACN in water (4 x 20 mF). The eluents were combined, water (5 x 4 mF) added, lyophilized to afford Example 1.
- Step E Tert-butyl 9-((7-oxoheptyl)oxy)nonanoate 2e
- Step F (E)-benzyl 9-((9-(tert-butoxy)-9-oxononyl)oxy)non-2-enoate 2f
- Step G 9-((9-(Tert-butoxy)-9-oxononyl)oxy)nonanoic acid 2g
- Step H (S)-21 ,40-di-tert-butyl 1-methyl 9, 18, 23-trioxo-2,5, 11 , 14,32-pentaoxa-8, 17,22- triazatetracontane-1 ,21 ,40-tricarboxylate 2h
- Step A (S)-l-tert-butyl 5-methyl 2-(16-(tert-butoxy)-l 6-oxohexadecanamido)pentanedioate 4a
- 16-(fer/-butoxy)- 16-oxohexadecanoic acid (1 g, 2.92 mmol) in DMF (12 mL)
- (S)- 1 -feri-butyl 5-methyl 2-aminopentanedioate hydrochloride (0.82 g, 3.21 mmol)
- FIATU (1.22 g, 3.21 mmol
- DIEA 2.55 mL, 14.60 mmol
- Step B (S)-5-(tert-butoxy)-4-(16-(tert-butoxy)-16-oxohexadecanamido)-5-oxopentanoic acid 4b
- (S)- 1 -feri-butyl 5-methyl 2-(16-(fer/-butoxy)-16- oxohexadecanamido)pentanedioate 4a 1.3 g, 2.40 mmol
- THF 13 mL
- 1 M LiOH 4.80 mL, 4.80 mmol
- Step C (21S,26S)-21,26,42-tri-tert-butyl 1-methyl 9, 18,23, 28-tetraoxo-2, 5,11, 14-tetraoxa-
- Step D ( 22S , 27S)-22, 27 -bis (tert-butoxycarbonyl)-46, 46-dimethyl- 10, 19,24,29, 44-pentaoxo-
- Example 4 7.06 pmol) in 60% ACN in water (20 mF) was loaded onto the resin column, and the column was eluted with 60% ACN in water (4 x 20 mF). The eluents were combined, water (5 x 4 mF) added, lyophilized to afford Example 4.
- FCMS (ESI) calc’d for C122H176CIFN20O31 [M - Cl ] + : 2436.3, found 2436.3; [(M - CL+ H)/2] + : 1218.6, found 1219.2.
- Step A (S)-21 37-di-tert-butyl 1-methyl 9, 18,2 -trioxo-2, 5, 11, 14-tetraoxa-8, 17,22-triazaheptatriacontane- 1,21,37-tricarboxylate 5a
- (S)-23 -/ «'/-butyl 1-methyl 22-amino-10,19-dioxo-3,6,12,15-tetraoxa-9,18-diazatricosane- 1,23-dioate 3d’ 510 mg, 1.005 mmol
- DMF 5 mL
- 16-(/er/-butoxy)-16-oxohexadecanoic acid 344 mg, 1.005 mmol
- HATU 82 mg, 1.005 mmol
- DIEA 0.526 mL, 3.01 mmol
- Step B (S)-22-(tert-butoxycarbonyl)-41 ,41 -dimethyl- 10, 19,24,39-tetraoxo-3 ,6, 12, 15,40-pentaoxa-9,18,23- triazadotetracontan- 1 -oic acid 5b
- the fractions containing desired product were combined and concentrated. The residue was lyophilized to afford (S)-22-(/ «'/-butoxycarbonyl)-41 .41 -dimethyl- 10.
- the resin was then quenched with 5% DIPEA and 10% MeOH in DCM (5 mL) and shaken for 2 h at RT.
- the resin was filtered, rinsed with DCM three times, DMF three times, DCM three times then dried under vacuum to give resin 6a.
- Resin 6a from step A, was treated with 20% piperidine in DMF (4 mL), shaken for 30 min at RT, filtered and rinsed with DMF three times, DCM three times, and DMF three times. The resin was then treated with a solution of Fmoc-L-Glu-OtBu (0.851 g, 2.00 mmol), HATU (0.760 g, 2.00 mmol) and DIPEA (0.699 mL,
- Resin 6b from Step B, was treated with 20% piperidine in DMF (4 mL), shaken for 30 min at RT, filtered and rinsed with DMF three times, DCM three times, and DMF three times. The resin was then treated with a solution of Fmoc-L-Glu-OtBu (0.851 g, 2.00 mmol), HATU (0.760 g, 2.00 mmol) and DIPEA (0.699 mL,
- Example 6 5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 10 mL), followed by 20% ACN in water (2 x 10 mL). A solution of 6j (18.0 mg, 7.06 mitioI) in 60% ACN in water (20 mL) was loaded onto the resin column, and the column was eluted with 60% ACN in water (4 x 20 mL). The eluents were combined, water (5 x 4 mL) added, lyophilized to afford Example 6.
- Step A Synthesis of 7a To a solution of J (14.5 mg, 7.44 miho ⁇ ) in DMF (200 pL) and water (20 pL) were added (S)-22-(lerl- butoxycarbonyl)-43 ,43 -dimethyl- 10,19,24,41 -tetraoxo-3 ,6, 12, 15,42-pentaoxa-9, 18,23 -triazatetratetracontan- 1-oic acid If (8.82 mg, 10.4 miho ⁇ ), HATU (5.66 mg, 0.015 mmol) and DIEA (10.4 mT, 0.060 mmol) at - 20 °C. The mixture was stirred at 0 °C for 0.5 h.
- Example 7 5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mL), followed by 20% ACN in water (2 x 10 mL). A solution of 7b (11 mg, 4.31 pmol) in 50% ACN in water (20 mL) was loaded onto the resin column, and the column was eluted with 50% ACN in water (4 x 20 mL). The eluents were combined and lyophilized to afford Example 7.
- Step B Synthesis of lib
- Step C Synthesis of Example 11 5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mF), followed by 20% ACN in water (2 x 10 mF). A solution of lib (17 mg, 7.08 gmol) in 60% ACN in water (20 mF) was loaded onto the resin column, then the column was eluted with 60% ACN in water (4 x 20 mF). The eluents were combined, water (5 x 4 mF) added, lyophilized to afford Example 11. FCMS (ESI) calc’d for C116H171CIFN17O29 [ M - Cl ] + : 2285.2, found 2285.2;
- Step B (S)-5-(tert-butoxycarbonyl)-N-(2-(2-(3-methoxy-3-oxopropoxy)ethoxy)ethyl)-N,N-dimethyl- 3, 8,17,26-tetraoxo- 1 -phenyl-2, 12,15,21,24-pentaoxa- 4, 9,18,27- tetraazanonacosan-29-aminium 2,2,2-trifluoroacetate 12b
- Step C (S)-25-amino-N-(2-(2-(3-methoxy-3-oxopropoxy)ethoxy)ethyl)-N,N,28,28-tetramethyl-
- Example 12 5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mL), followed by 20% ACN in water (2 10 mL). A solution of 12g (18 mg, 7.12 pmol) in ACN and water (3 :2, 20 mL) was loaded onto the resin column, then the column was eluted with 60% ACN in water (4 x 20 mL). The eluents were combined and lyophilized to afford Example 12. LCMS (ESI) calc’d for C HnsClFNisCte [M - Cf] + : 2415.8, found 2415.3. Preparation of Example 13
- Selected compounds of the invention were subjected to one or more of the following procedures to assay their activity for antagonism of PCSK9 activity.
- a solution containing 1 nM biotinylated PCSK9 + 2.5 nM Fance Streptavidin Europium (Strep-Eu) is made in 50 mM HEPES pH 7.4, 0.15 M NaCl, 5 mM CaC12, 0.01% BSA, and 0.01% Surfactant P20.
- a separate solution containing 40 nM of the AlexaFluor tagged cyclic peptide is made in the same buffer system.
- An Echo is used to transfer 0.750ul of compound to an assay plate followed by the addition of 15ul of PCSK9+Stept-Eu and 15ul of AF peptide.
- the final assay volume is 30.750ul containing 0.5nM PCSK9, 1.25nM Strep-Eu, and 20nM AF cyclic peptide.
- the reaction is incubated at room temperature for at least two hours prior to fluorescence measurements using an Envision Multilabel Reader.
- IC50 values are determined by fitting data to a sigmoidal dose-response curve using nonlinear regression. Ki is then calculated from the Ic50 and the KD of AF cyclic peptide.
- Reagent A was prepared in accordance with the following method:
- the peptide was synthesized on a 0.250 mmol scale on CEM Liberty Blue, Microwave synthesizer using F moc/ZBu chemistry on PS Rink-Amide MBHA resin, 0.32 mmol g 1 .
- the assembly was performed using single-couplings using 4eq of Fmoc protected amino acid 0.2M in DMF, 4eq of 0.5M HATU in DMF, 4eq of 2M DIPEA (double coupling for Tyr). Fmoc deprotection cycles were performed using 20% (V/V) piperidine in DMF.
- Step B Synthesis of Intermediate Compound Int-B: as described for reagent B Purified by RP-HPLC (Waters Deltapak C4, double cartridge, 40x100 mm, 15pm, 300A; 15% to 35% ACN/water + 0.1% TFA modifier over 20 min). Collected fractions lyophilized to afford 35mg of Intermediate Compound Int-B.
- LCMS anal calcd. for C69H81F2N15013S2: 1430.62; found: 1430.9 (M+l) +
- Step C Synthesis of Compound Reagent A: as described for reagent B LCMS anal calcd. for C105H122F2N17O26S6 3 -; 2268.58; 1135.8 (M+2) 2+
- AF AlexaFluor647
- a solution containing 1 nM biotinylated PCSK9 + 2.5 nM Lance Streptavidin Europium (Strep-Eu) is made in 50 mM HEPES pH 7.4, 0.15 M NaCl, 5 mM CaC12, 0.01% BSA, and 0.01% Surfactant P20.
- a separate solution containing 1920 nM of the AlexaFluor tagged cyclic peptide is made in the same buffer system.
- An Echo is used to transfer 0.075ul of compound plus 0.675ul of DMSO to each well of an assay plate followed by the addition of 15ul of PCSK9+Stept-Eu and 15ul of AF peptide.
- the final assay volume is 30.750ul containing 0.5nM PCSK9, 1.25nM Strep-Eu, and 960nM AF cyclic peptide.
- the reaction is incubated at room temperature for at least two hours prior to fluorescence measurements using an Envision Multilabel Reader.
- IC50 values are determined by fitting data to a sigmoidal dose- response curve using nonlinear regression. Ki is then calculated from the Ic50 and the KD of AF cyclic peptide.
- Step A Synthesis of Intermediate Compound Int-A
- the peptide was synthesized on a 0.250 mmol scale on CEM Liberty Blue, Microwave synthesizer using Fmoc/iBu chemistry on PS Rink-Amide MBHA resin, 0.32 mmol g 1 .
- the assembly was performed using single-couplings using 4eq of Fmoc protected amino acid 0.2M in DMF, 4eq of 1M Oxyma in DMF, 4eq of 0.5M /V, /V-d i i sopropyl carbod i i m i dc (DIC) (double coupling for Y01).
- Fmoc deprotection cycles were performed using 20% (V/V) piperidine in DMF.
- AF AlexaFluor647
- a solution containing 1 nM biotinylated PCSK9 + 2.5 nM Lance Streptavidin Europium (Strep-Eu) is made in 50 mM HEPES pH 7.4, 0.15 M NaCl, 5 mM CaC12, 0.01% BSA, and 0.01% Surfactant P20.
- a separate solution containing 1920 nM of the AlexaFluor tagged cyclic peptide is made in the same buffer system.
- An Echo is used to transfer 0.015 ul of compound plus 0.735 ul of DMSO to each well of an assay plate followed by the addition of 15 ul of PCSK9+Stept-Eu and 15 ul of AF peptide.
- the final assay volume is 30.750 ul containing 0.5 nM PCSK9, 1.25 nM Strep-Eu, and 960 nM AF cyclic peptide.
- the reaction is incubated at room temperature for at least two hours prior to fluorescence measurements using an Envision Multilabel Reader.
- IC50 values are determined by fitting data to a sigmoidal dose-response curve using nonlinear regression. Ki is then calculated from the Ic50 and the KD of AF cyclic peptide.
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Abstract
Disclosed are compounds of Formula (I), or a pharmaceutically acceptable salt thereof: (I) wherein A, A1, A2, R1, R2 and R3 are as defined herein, which compounds have properties for antagonizing PCSK9. Also described are pharmaceutical formulations comprising the compounds of Formula I or their salts, and methods of treating cardiovascular disease and conditions related to PCSK9 activity, e.g. atherosclerosis, hypercholesterolemia, coronary heart disease, metabolic syndrome, acute coronary syndrome, or related cardiovascular disease and cardiometabolic conditions.
Description
PCSK9 ANTAGONIST COMPOUNDS
RELATED APPLICATIONS
This application claims the benefit of U.S. Provisional Patent Application No. 62/951,802, filed December 20, 2019, the entire content of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
The identification of compounds and/or agents effective in the treatment of cardiovascular affliction is highly desirable. In clinical trials, reductions in LDL cholesterol levels have been directly related to the rate of coronary events; Law et ai, 2003 BMJ 326: 1423-1427. The moderate lifelong reduction in plasma LDL cholesterol levels was found to correlate with a substantial reduction in the incidence of coronary events; Cohen et ai, 2006 N. Engl. J. Med. 354:1264-1272. This was the case even in populations with a high prevalence of non-lipid-related cardiovascular risk factors; supra. Accordingly, there is great benefit to be reaped from the managed control of LDL cholesterol levels.
Proprotein convertase subtilisin-kexin type 9 (hereinafter called “PCSK9”), also known as neural apoptosis-regulated convertase 1 (“NARC-1”), is a proteinase K-lilce subtilase identified as the 9th member of the secretory subtilase family; see Seidah et ai, 2003 PNAS 100:928-933. PCSK9 belongs to the mammalian proprotein convertase family of serine proteases and contains an N- terminal signal sequence, prodomain, catalytic domain, and C-terminal domain; see Seidah et ai, 2012 Nat. Rev. Drug Discov. 11:367-383. A study of PCSK9 transcriptional regulation demonstrated that it is regulated by sterol regulatory element -binding proteins (“SREBP”), as seen with other genes involved in cholesterol metabolism; Maxwell et ai, 2003 J. Lipid Res. 44:2109- 2119, as is typical of other genes implicated in lipoprotein metabolism; Dubuc et al. , 2004 Arterioscler. Thromb. Vase. Biol. 24:1454-1459. Statins have been shown to upregulate PC SK9 expression in a manner attributed to the cholesterol-lowering effects of the drugs; supra. Moreover, it has been shown that PCSK9 promoters possess two conserved sites involved in cholesterol regulation, a sterol regulatory element and an Spl site; supra.
While in the endoplasmic reticulum, PCSK9 performs as its only catalytic activity an autocleavage between residues Gln-152 and Ser-153; see Naureckiene et ai, 2003 Arch. Biochem. Biophys. 420:55-67; Seidah et al, 2003 Proc. Natl. Acad. Sci. U. S. A. 100:928-933. The prodomain remains tightly associated with the catalytic domain during subsequent trafficking through the trans- Golgi network. The maturation via autocleavage has been demonstrated to be critical for PCSK9 secretion and subsequent extracellular function (see Benjannet et ai, 2012 J. Biol. Chem.
287:33745-33755). Accordingly, several lines of evidence demonstrate that PCSK9, in particular, lowers the amount of hepatic LDLR protein and thus compromises the liver's ability to remove LDL cholesterol from the circulation.
Adenovirus-mediated overexpression of PCSK9 in the livers of mice results in the accumulation of circulating LDL-C due to a dramatic loss of hepatic LDLR protein, with no effect on LDLR mRNA levels; Benjannet et al, 2004 J. Biol. Chem. 279:48865-48875; Maxwell & Breslow, 2004 PNAS 101:7100-7105; Park et al, 2004 J. Biol. Chem. 279:50630-50638; and Lalanne et al., 2005 J. Lipid Res. 46: 1312-1319. The effect of PCSK9 overexpression on raising circulating LDL-C levels in mice is completely dependent on the expression of LDLR, again, indicating that the regulation of LDL-C by PCSK9 is mediated through downregulation of LDLR protein. In agreement with these findings, mice lacking PCSK9 or in which PCSK9 mRNA has been lowered by antisense oligonucleotide inhibitors have higher levels of hepatic LDLR protein and a greater ability to clear circulating LDL-C; Rashid et al, 2005 PNAS 102:5374-5379; and Graham et al, 2007 J. Lipid Res. 48(4):763-767. In addition, lowering PCSK9 levels in cultured human hepatocytes by siRNA also results in higher LDLR protein levels and an increased ability to take up LDL-C; Benjannet et al, 2004 J. Biol. Chem. 279:48865-48875; and Lalanne et al, 2005 J. Lipid Res. 46:1312-1319. Together, these data indicate that PCSK9 action leads to increased LDL-C by lowering LDLR protein levels.
A number of mutations in the gene PCSK9 have also been conclusively associated with autosomal dominant hypercholesterolemia (“ADH”), an inherited metabolism disorder characterized by marked elevations of low density lipoprotein (“LDL”) particles in the plasma which can lead to premature cardiovascular failure; see Abifadel et al. , 2003 Nature Genetics 34:154-156; Timms et al, 2004 Hum. Genet. 114:349-353; Leren, 2004 Clin. Genet. 65:419-422. A later-published study on the S127R mutation of Abifadel et al, supra, reported that patients carrying such a mutation exhibited higher total cholesterol and apoBlOO in the plasma attributed to (1) an overproduction of apoB 100-containing lipoproteins, such as low density lipoprotein (“LDL”), very low density lipoprotein (“VLDL”) and intermediate density lipoprotein (“IDL”), and (2) an associated reduction in clearance or conversion of said lipoproteins; Ouguerram et al, 2004 Arterioscler. Thromb. Vase. Biol. 24:1448-1453.
Accordingly, there can be no doubt that PCSK9 plays a role in the regulation of LDL. The expression or upregulation of PCSK9 is associated with increased plasma levels of LDL cholesterol, and the corresponding inhibition or lack of expression of PCSK9 is associated with reduced LDL cholesterol plasma levels. Decreased levels of LDL cholesterol associated with sequence variations
in PCSK9 have been found to confer protection against coronary heart disease; Cohen, 2006 N. Engl. J. Med. 354:1264-1272.
Thus, identification of compounds and/or agents effective in the treatment of cardiovascular affliction is highly desirable, including antagonism of PCSK9’s role in LDL regulation, however, in general, because PCSK9 circulates in blood and has modest binding affinity to cell surface LDL receptors prior attempts to utilize this mechanism in treatment of diseases related to high serum LDL levels have been focused on the use of large biomolecules, for example, antibodies. Accordingly, there is scant publication reflecting activity toward this target using small peptides or small molecules to inhibit PCSK9, see for example, Zhang et al, 2014 J. Biol. Chemistry, 289(2): 942- 955. Moreover, there is a paucity of compounds which are amenable to formulation into a dosage form for utilizing an oral administration route of dosing such compounds, a route which would be highly desirable for the provision of therapy for conditions in which regulation of the activities of PCSK9 could play a role.
The present invention advances these interests by providing antagonists of PCSK9 which are believed to be of use for inhibiting the activities of PCSK9 and the corresponding role PCSK9 plays in various conditions for which the administration of a PCSK9 antagonist provides therapy. Compounds of the instant invention have a favorable pharmacokinetic profile and prolonged pharmaceutical action. SUMMARY OF THE INVENTION
A is selected from C2-6 alkyl, C2-6 alkenyl or -(CR2)nRx(CR2)n-;
A2 is selected from -(CR2)nX(CR2)n- or -(CR2)nNRC(0)(CR2)n-; X is O or CR2;
R is independently selected from FI or Ci-6 alkyl;
Ra is independently selected from H, -CR2-S(0)20R9, or -C(0)0R9;
Rb is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N+(CFI3)2; Rx is tetrazolyl; Rd is independently selected from FI or -C(0)0R9;
R1 is selected from:
(a) H,
(b) -(CR2)Z -RX-(CR2)ZNR3,
(c) -(CR2)Z -RX-(CR2)Z NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3, and
(d) -(CR2)Z- Rx-(CR2)z-NRb-C(0)R10;
R2 is selected from:
(a) -(CR2)z-NRb-C(0)R10, and
(b) -(CR2)z-NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3;
R5 is independently selected from -(CRa 2)x-, -(CRa 2)xO(CRa 2)x-, and Ci-s alkyl; R6 is independently selected from -(CRa 2)xNRC(0)-, -(CR2)xNRS(0)2-, and -(CRa 2)n0(CRa 2)qNRC(0)-;
R12 is independently selected from -Cn-2o alkyl-Rd, -(CR2)x-0-(CR2)x -Rd, -Cn-2o alkyl-C(0)NR- (CRd 2)2H, and C2-16 alkenyl;
R20 is independently selected from a) -(CRa 2)tO(CRa 2)qO-(CRa 2)t-, b) -(CRa 2)t0(CRa 2)q0-(CRa 2)t-NRC(0)-, c) -(CRa 2)t0(CRa 2)q-NRC(0)-(CRa 2)n0(CRa 2)n0-, d) -(CRa 2)t-NRC(0)-(CRa 2)q0(CRa 2)q0-(CRa 2)t-, e) -(CRa 2)tO(CRa 2)qO-(CRa 2)r, and f) -(CRa 2),-0-(CRa 2)q0(CRa 2)q0-(CRa 2)t-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3; q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3;
t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6; provided that
, then A2 is -(CR2)nX(CR2)n-; or a pharmaceutically acceptable salt of any thereof.
In a further embodiment, the invention provides a compound of Formula I, wherein R3 is F, or a pharmaceutically acceptable salt of any thereof.
In another embodiment, the invention provides compounds of Formula I, wherein:
A is selected from C2-6 alkyl, C2-6 alkenyl or -(CR2)nRx(CR2)n-;
A2 is selected from -(CR2)nX(CR2)n- or -(CR2)nNRC(0)(CR2)n-;
X is O or CR2;
R is independently selected from H or Ci-6 alkyl;
Ra is independently selected from H, -CR2-S(0)20R9, or -C(0)OR9;
Rb is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N+(CH3)2;
Rx is tetrazolyl;
Rd is independently selected from H or -C(0)OR9;
R1 is selected from:
(a) H,
(b) -(CR2)Z -RX-(CR )ZNR3,
(c) -(CR )Z -RX-(CR )Z NR-C(0)-(CR2)z[0(CR2)n],-N (CI l3)3, and
(d) -(CR )Z- Rx-(CR2)z-NRb-C(0)R10;
R2 is selected from:
(a) -(CR2)z-NRb-C(0)R10, and
(b) -(CR2)z-NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3;
R3 is F;
R5 is independently selected from -(CR¾)x-, -(CRa2)xO(CR¾)x-, and Ci-s alkyl; R6 is independently selected from -(CRa 2)xNRC(0)-, -(CR2)XNRS(0)2-, and
-(CRa 2)nO(CR¾)qNRC(0)-;
R9 is independently selected from H or Ci-6 alkyl;
R12 is independently selected from -Cn-20 alkyl-Rd, -(CR2)x-0-(CR2)x -Rd, - Cii-20 alkyl-C(0)NR- (CRd2)2H, and C2-16 alkenyl;
R20 is independently selected from a) -(CRa2)tO(CRa2)qO-(CR¾)t-, b) -(CRa 2)t0(CRa 2)q0-(CRa )t-NRC(0)-, and c) -(CRa2),-NRC(0)-(CRa2)q0(CRa2)q0-(CRa2),-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3; q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3; t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6; provided that
, then A2 is -(CR2)nX(CR2)n-; or a pharmaceutically acceptable salt of any thereof.
In one embodiment the present invention provides pharmaceutical compositions comprising a compound of the invention, for example, a compound of Formula I, and at least one pharmaceutical excipient, preferably a composition directed to oral administration.
In one aspect the present invention provides a method of antagonizing PCSK9 in the provision of therapy for disease states related to PCSK9 activity, for example, atherosclerosis, hypercholesterolemia, coronary heart disease, metabolic syndrome, acute coronary syndrome, or related cardiovascular disease and cardiometabolic conditions, by administering to a subject in need thereof a therapeutically effective amount of a compound of Formula I, or a salt thereof, preferably in the form of a pharmaceutical composition.
DETAILED DESCRIPTION OF THE INVENTION
In the description that follows conventional structural representation is employed and includes conventional stereochemical notation for certain asymmetric carbon centers.
Thus, structural representation of compounds of the invention includes conventional stereochemical notation for some asymmetric carbon centers shown in the example compounds. Accordingly, in such instances, solid black “wedge” bonds represent bonds projecting from the plane of the reproduction medium, “hashed wedge” bonds representing descending bonds into the plane of the reproduction medium, and a “wavy” line appended to a carbon bearing a double bond indicates both possible cis and trans orientations are included. As is conventional, plain solid lines represent all spatial configurations for the depicted bonding. Accordingly, where no specific stereochemical notation is supplied, the representation contemplates all stereochemical and spatial orientations of the structural features.
As is shown in the examples of the invention, and mentioned above, particular asymmetric carbon centers are structurally represented using conventional “Solid Wedge” and “Hash Wedge” bonding representation. For the most part, absolute configuration has not been determined for the example compounds, but has been assigned by analogy to specific example compounds of known stereochemical configurations (determined by X-ray crystallography) prepared using the same or analogous reaction conditions and starting reagents and isolated under the same chromatographic conditions. Accordingly, specific assignment of the configurations structurally represented herein is meant to identify the specific compounds prepared has having an excess of one particular stereoisomer and is not put forth herein necessarily as being a statement of the absolute determination of the stereochemical structure of said compound unless otherwise noted in the data presented.
It will be appreciated that where isomeric mixtures are obtained, the preparation of individual stereoisomers in significant percentages of enantiomeric excess can be carried out, if desired, by separation of the mixture using customary methods, for example by chromatography or crystallization, or by the use of stereochemically uniform starting materials for the synthesis
described, or by stereoselective synthesis. Optionally a derivatization can be carried out before a separation of stereoisomers. The separation of a mixture of stereoisomers can be carried out at an intermediate step during the synthesis of a compound of Formula I or it can be done on a final racemic product.
Where indicated herein, absolute stereochemistry is determined by X-ray crystallography of crystalline products or crystalline intermediates which are derivatized, if necessary, with a reagent containing a stereogenic center of known configuration. Unless a particular isomer, salt, solvate (including hydrates) or solvated salt of such racemate, enantiomer, or diastereomer is indicated, the present invention includes all such isomers, as well as salts, solvates (including hydrates) and solvated salts of such racemates, enantiomers, diastereomers and mixtures thereof.
The present invention also embraces isotopically-labeled compounds of the present invention which are structurally identical to those recited herein, but for the fact that a statistically significant percentage of one or more atoms in that form of the compound are replaced by an atom having an atomic mass or mass number different from the atomic mass or mass number of the most abundant isotope usually found in nature, thus altering the naturally occurring abundance of that isotope present in a compound of the invention. The present invention is meant to include all suitable isotopic variations of the compounds of Formula I.
Examples of isotopes that can be preferentially incorporated into compounds of the invention include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorus, iodine, fluorine and chlorine, for example, but not limited to: 2H, 3H, nC, 13C, 14C, 13N, 15N, 150, 170, 180, 31P, 32P, 35S, 18F, and 36C1, 123I, and 125I. It will be appreciated that other isotopes may be incorporated by known means also.
In particular, certain isotopically-labeled compounds of the invention (e.g., those labeled with 3H, nC, and 14C) are recognized as being particularly useful in compound and/or substrate tissue distribution assays using a variety of known techniques. Additionally, compounds of the invention contemplate isotopic substitution include different isotopic forms of hydrogen (H), including protium ( ' l l) and deuterium (2H or D). Protium is the predominant hydrogen isotope found in nature. Enriching for deuterium may afford certain therapeutic advantages, such as increasing in vivo half- life or reducing dosage requirements, or may provide a compound useful as a standard for characterization of biological samples. Isotopically-enriched compounds within Formula I can be prepared without undue experimentation by conventional techniques well known to those skilled in the art or by processes analogous to those described in the Schemes and Examples herein using appropriate isotopically-enriched reagents and/or intermediates.
Where a wavy line terminates a conventional bond (as opposed to connecting two atoms within a structure) it indicates a point of bonding to a structure, e.g.:
indicates a the secondary-butyl moiety is bonded via the methylene group via the bond terminated with the wavy line. Where an alphabetical notation is used to depict a substituent moiety, a dash is employed to indicate the point of bonding to the indicated substrate, e.g.: -CH2-C(0)-CH2C1 indicates the acetyl chloride moiety is bonded via the methylene portion of the moiety.
When any variable (e.g., n, R, Ra, R6, etc.) occurs more than one time in any constituent or in Formula I, its definition on each occurrence is independent of its definition at every other occurrence unless otherwise specified at the point of definition. One of ordinary skill in the art will recognize that choice of combinations of the various substituents defined in a structural representation, i.e. R, R6, R20, etc., are to be chosen in conformity with well-known principles of chemical structure connectivity and stability, and combinations of substituents and/or variables are permissible only if such combinations result in stable compounds. For example, if R10is defined as “- R5- N+(CFh)2 - (R20)n - (R6)m-R12”, integer n can be selected from 1 , 2 or 3 and integer m can be selected from 0, 1 , 2, 3, or 4. If integer n in this example is 3 and integer m is 4, then each of the three R20 substitutions and each of the four R6 substitutions is independently selected from the list of definitions provided herein.
A "stable" compound is a compound which can be prepared and isolated and whose structure and properties remain or can be caused to remain essentially unchanged for a period of time sufficient to allow use of the compound for the purposes described herein (e.g., therapeutic administration to a subject). The compounds of the present invention are limited to stable compounds embraced by Formula I.
Where any variable or moiety is expressed in the form of a range, e.g. (-CH2-)o-4, both of the extremes of the specified range are included (i.e. 0 and 4 in the example) as well as all of the whole number values in between (i.e. 1, 2 and 3 in the example).
The term "halogen" includes fluorine, chlorine, bromine and iodine unless specified otherwise at the point of use.
As the term is used herein, “subjects” (alternatively “patients”) refers to an animal, preferably a mammal, and in particular a human or a non-human animal including livestock animals and domestic animals including, but not limited to, cattle, horses, sheep, swine, goats, rabbits, cats, dogs, and other mammals in need of treatment. In some embodiments the subject is preferably a human.
As used herein, the term "administration" and variants thereof ( e.g ., “administering” a compound) in reference to a compound of Formula I means providing the compound, or a pharmaceutically acceptable salt thereof, to a subject in need of treatment.
As mentioned above, in one aspect the present invention includes the provision of compounds of Formula I, or a pharmaceutically acceptable salt thereof, which have properties that antagonize PCSK9 function.
A2 IS -(CR2)nX(CR )n-; X is O or CR2;
R is independently selected from H or Ci-6 alkyl;
Ra is independently selected from H or -C(0)0R9;
Rb is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N+(CH3)2; Rd is independently selected from H or -C(0)0R9; Rx is tetrazolyl;
R1 is H;
R2 is selected from:
(a) -(CR )z-NRb-C(0)R10, and
(b) -(CR2)z-NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3;
R5 is independently selected from -(CR¾) -, -(CRa2)xO(CRa2)x-, and Ci-s alkyl; R6 is independently selected from -(CRa 2)xNRC(0)-, -(CR2)XNRS(0)2-, and -(CRa2)n0(CRa 2)qNRC(0)-;
R9 is independently selected from FI or Ci-6 alkyl; R10 is independently selected from: a) - (R5- N iel li -R V(R20)n -(R6)m-R12, b) — (R20)n - (R6)m- R5- N iel li -R6-R12,
R12 is independently selected from -Cn-2o alkyl-Rd, -(CR2)x-0-(CR2)x -Rd, - Cn-2o alkyl-C(0)NR- (CRd 2)2H, and C2-16 alkenyl;
R20 is independently selected from a) -(CRa 2)tO(CRa 2)qO-(CRa 2)t-, b) -(CRa 2)t0(CRa 2)q0-(CRa 2)t-NRC(0)-, c) -(CRa 2)t0(CRa 2)q-NRC(0)-(CRa 2)n0(CRa 2)n0-, d) -(CRa 2)t-NRC(0)-(CRa 2)q0(CRa 2)q0-(CRa 2)t-, e) -(CRa 2)tO(CRa 2)qO-(CRa 2)t-, and f) -(CRa 2),-0-(CRa 2)q0(CRa 2)q0-(CRa 2)t-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3; q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3; t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6; or a pharmaceutically acceptable salt of any thereof.
In another embodiment, the present invention comprises compound of Formula I, wherein: A is selected from C2-6 alkyl or -(CR2)nRx(CR2)n-;
X is O or CR2;
R is independently selected from H or Ci-6 alkyl;
Ra is independently selected from H or -C(0)0R9;
Rb is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N+(CH3)2; Rx is tetrazolyl;
Rd is independently selected from H or -C(0)0R9;
R1 is H;
R2 is selected from:
(a) -(CR )z-NRb-C(0)R10, and
(b) -(CR2)z-NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3;
R5 is independently selected from -(CR¾) -, -(CRa2)xO(CRa2)x-, and Ci-s alkyl; R6 is independently selected from -(CRa 2)xNRC(0)-, -(CR2)XNRS(0)2-, and -(CRa2)n0(CRa 2)qNRC(0)-;
R9 is independently selected from FI or Ci-6 alkyl; R10 is independently selected from: a) - (R5- N iel li -R V(R20)n -(R6)m-R12, b) — (R20)n - (R6)m- R5- N iel li -R6-R12,
R12 is independently selected from -Cn-2o alkyl-Rd, -(CR2)x-0-(CR2)x -Rd, - Cn-2o alkyl-C(0)NR- (CRd 2)2H, and C2-16 alkenyl;
R20 is independently selected from a) -(CRa 2)tO(CRa 2)qO-(CRa 2)t-, b) -(CRa 2)t0(CRa 2)q0-(CRa 2)t-NRC(0)-, c) -(CRa 2)t0(CRa 2)q-NRC(0)-(CRa 2)n0(CRa 2)n0-, d) -(CRa 2)t-NRC(0)-(CRa 2)q0(CRa 2)q0-(CRa 2)r, e) -(CRa 2)tO(CRa 2)qO-(CRa 2)r, and f) -(CRa 2),-0-(CRa 2)q0(CRa 2)q0-(CRa 2)t-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3; q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3; t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6; or a pharmaceutically acceptable salt of any thereof.
In another embodiment, the present invention comprises compounds of Formula I, wherein: A is C2-6 alkyl;
A2 is -(CR2)nNRC(0)(CR2)n-;
R is independently selected from H or Ci-6 alkyl;
Ra is independently selected from H or -C(0)0R9;
Rb is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N+(CH3)2; Rx is tetrazolyl;
Rd is independently selected from H or -C(0)0R9;
R1 is selected from:
(a) -(CR2)Z -RX-(CR )ZNR2,
(b) -(CR2)Z -RX-(CR2)Z NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3, and
(c) -(CR2)Z- Rx-(CR2)z-NRb-C(0)R10;
R2 is selected from: (a) -(CR2)z-NRb-C(0)R10, and
(b) -(CR2)z-NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3;
R5 is independently selected from -(CRa 2)x-, -(CRa 2)xO(CRa 2)x-, and Ci-s alkyl; R6 is independently selected from -(CRa 2)xNRC(0)-, -(CR2)xNRS(0)2-, and -(CRa 2)n0(CRa 2)qNRC(0)-;
R9 is independently selected from FI or Ci-6 alkyl;
R12 is independently selected from -Cn-2o alkyl-Rd, -(CR2)x-0-(CR2)x -Rd, - Cn-2o alkyl-C(0)NR- (CRd 2)2H, and C2-16 alkenyl;
R20 is independently selected from a) -(CRa 2)tO(CRa 2)qO-(CRa 2)t-, b) -(CRa 2)t0(CRa 2)q0-(CRa 2)t-NRC(0)-, c) -(CRa 2)t0(CRa 2)q-NRC(0)-(CRa 2)n0(CRa 2)n0-, d) -(CRa 2)t-NRC(0)-(CRa 2)q0(CRa 2)q0-(CRa 2)t-, e) -(CRa 2)tO(CRa 2)qO-(CRa 2)r, and f) -(CRa 2),-0-(CRa 2)q0(CRa 2)q0-(CRa 2)t-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3; q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3; t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6; or a pharmaceutically acceptable salt of any thereof.
In an embodiment of the compounds of Formula I, A is selected from C2-6 alkyl, or -(CR2)nRx(CR2)n-. In another embodiment of the compounds of Formula I, A is C2-6 alkyl. In a further embodiment, A is -(CH2)4-6. In another embodiment, A is -(CR2)nRx(CR2)n-.
In an embodiment of the compounds of Formula I, A2 is selected from
-(CR2)nX(CR2)n-, where X is O or CH2. In another embodiment, A2 is -(O¾)2q(ϋΐ2)2 or (CH2)4-6. In another embodiment,
In an embodiment of the compounds of Formula I, R1 is selected from -(CR2)Z -Rx- (CR2)ZNR2, -(CR2)z -Rx-(CR2)z NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3, and -(CR )Z- Rx-(CR )z-NRb- C(0)R10.
In an embodiment of the compounds of Formula I, R1 is H; and R2 is selected from -(CR2)z-NRb-C(0)R10 and -(CR2)z-NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3.
In an embodiment of the compounds of Formula I, R2 is selected from -(CR2)z-NR-C(0)- (CR2)z[0(CR2)n]r-N+(CH3)3. In another embodiment, R2 is -(CR2)z-NRb-C(0)R10. In a further embodiment, R2 is -(CH2)Z-NH-C(0)R10.
In an embodiment of the compounds of Formula I, R5 is Ci-s alkyl.
In an embodiment of the compound of Formula I, R6 is -(CRa 2)xNRC(0)-. In a further embodiment, R6 is selected from:
In an embodiment of the compounds of Formula I, R10 is selected from a) -(R20)n - (R6)m- R5- N (CI I3)2 -R6-R12, b) - R20- N (CI I3)2 - (R6)m- (R20)n - (R6)q-R12, c) -(R20)n- (R6)m-R12, d) -(R20)n- N+(CH3)2 - (R20)n - (R6)q-R12, e) -(R20)n-N+(CH3)2- (R6)q-R12, f) — (R20)n - (R6)m- R20- N+(CH3)2 -(R20)S - (R6)q-R12, and g) -(R20)n- N (CI I3)2 - (R6)q — (R20)n - (R6)m-R12.
In another embodiment of the compounds of Formula I, R10 is selected from a) - R20- N (CI I3)2 - (R6)m- (R20)n - (R6)q-R12,
In furth
Also provided herein are compounds of Formula I, selected from Ex-1, Ex-2, Ex-3, Ex-4, Ex-
5, Ex-6, Ex-7, Ex-8, Ex-9, Ex-10, Ex-11, Ex-12, and Ex-13 or any pharmaceutically acceptable salt thereof.
An embodiment of the invention comprises compounds selected from Ex-7, Ex-9, Ex- 11 , and Ex- 13, or a pharmaceutically acceptable salt thereof. The compounds shown below in Table 1 are also referred to herein as “compounds of the invention”. In Table 1, the * denotes that the compound includes “A-”, which represents any pharmaceutically acceptable counter ion, including those depicted in the experimental section.
Table 1
The term “salt(s)”, and its use in the phrase “pharmaceutically acceptable salts” employed herein, includes any of the following: acidic salts formed with inorganic and/or organic acids, basic salts formed with inorganic and/or organic bases, zwitterionic and quaternary ammonium complexes. Salts of compounds of the invention may be formed by methods known to those of ordinary skill in the art, for example, by reacting a compound of the invention with an amount of acid or base, such as an equivalent amount, in a medium such as one in which the salt precipitates or in aqueous medium followed by lyophilization. As used herein, a pharmaceutically acceptable salt of the compounds of Table 1 may be different from the compound associated with a counter ion (A-).
Compounds of the invention contain tri-coordinate nitrogen atoms, for example, primary, secondary or tertiary amino moieties, wherein, as is known, the lone pair of electrons residing on the
nitrogen atom may be protonated with an appropriate acid or alkylated with an appropriate reagent, for example, alkyl bromide, under the appropriate reaction conditions to provide tetracoordinate charged nitrogen stabilized by an anion generated in the process, for example, a halogen ion or conjugate base. Accordingly, compounds of the invention may be prepared in the form of a free- base or isolated in the form of a quaternary complex or a salt complex. In some instances where there is an appropriate acidic proton proximal to a basic nitrogen, formation of a zwitterionic complex is possible. As the term is employed herein, salts of the inventive compounds, are included in the scope of the invention, whether acidic salts formed with inorganic and/or organic acids, basic salts formed with inorganic and/or organic bases, salts formed which include zwitterionic character (for example, where a compound contains both a basic moiety, for example, but not limited to, a nitrogen atom, for example, an amine, pyridine or imidazole, and an acidic moiety, for example, but not limited to a carboxylic acid), and quaternary ammonium complexes.
Accordingly, structural representation of compounds of the invention, whether in a free-base form, a salt form, a zwitterionic form or a quaternary ammonium form, also include all other forms of such compounds discussed above. Thus, one aspect of the invention is the provision of compounds of the invention in the form of a pharmaceutically acceptable salt, zwitterionic complex or quaternary ammonium complex. Those skilled in the art will recognize those instances in which the compounds of the invention may form such complexes, including where a tetracoordinate nitrogen can be quatemized or protonated and the charged nitrogen form stabilized by an associated anion. The term "pharmaceutically acceptable salt" refers to a salt (including a quaternary ammonium complex and an inner salt such as a zwitterion complex) which possesses effectiveness similar to or greater than a free-base form of the compound and which is not biologically or otherwise undesirable ( e.g ., is neither toxic nor otherwise deleterious to the recipient thereof).
The formation of pharmaceutically useful salts from basic (or acidic) pharmaceutical compounds are discussed, for example, by S. Berge et al, Journal of Pharmaceutical Sciences (1977) 66(1) 1-19; P. Gould, International J. of Pharmaceutics (1986) 33 201-217; Anderson et al, The Practice of Medicinal Chemistry (1996), Academic Press, New York; in The Orange Book (Food & Drug Administration, Washington, D.C. on their website); and P. Heinrich Stahl, Camille G. Wermuth (Eds.), Handbook of Pharmaceutical Salts: Properties, Selection, and Use, (2002) Int'l. Union of Pure and Applied Chemistry, pp. 330-331. These disclosures are incorporated herein by reference.
The present invention contemplates both freebase forms of the compounds of the invention and all available salts, including salts which are generally recognized as safe for use in preparing pharmaceutical formulations and those which may be formed presently within the ordinary skill in
the art and are later classified as being “generally recognized as safe” for use in the preparation of pharmaceutical formulations, termed herein as “pharmaceutically acceptable salts”. As will be appreciated, freebase compounds may be prepared by controlling the conditions of isolation of the compound during synthesis or by neutralization and ion exchange from salt forms of compounds of the invention.
Examples of pharmaceutically acceptable acid salts include, but are not limited to, acetates, including trifluoroacetate salts, adipates, alginates, ascorbates, aspartates, benzoates, benzenesulfonates, bisulfates, borates, butyrates, citrates, camphorates, camphorsulfonates, cyclopentanepropionates, digluconates, dodecylsulfates, ethanesulfonates, fumarates, glucoheptanoates, glycerophosphates, hemisulfates, heptanoates, hexanoates, hydrochlorides, hydrobromides, hydroiodides, 2-hydroxyethanesulfonates, lactates, maleates, methanesulfonates, methyl sulfates, 2-naphthalenesulfonates, nicotinates, nitrates, oxalates, pamoates, pectinates, persulfates, 3-phenylpropionates, phosphates, picrates, pivalates, propionates, salicylates, succinates, sulfates, sulfonates (such as those mentioned herein), tartarates, thiocyanates, toluenesulfonates (also known as tosylates,) undecanoates, and the like.
Examples of pharmaceutically acceptable basic salts include, but are not limited to, ammonium salts, alkali metal salts such as sodium, lithium, and potassium salts, alkaline earth metal salts such as calcium and magnesium salts, aluminum salts, zinc salts, salts with organic bases (for example, organic amines) such as benzathines, diethylamine, dicyclohexylamines, hydrabamines (formed with N,N-bis(dehydroabietyl)ethylenediamine), N-methyl-D-glucamines, N-methyl-D- glucamides, t-butyl amines, piperazine, phenylcyclohexyl-amine, choline, tromethamine, and salts with amino acids such as arginine, lysine and the like. Basic nitrogen-containing groups may be converted to an ammonium ion or quatemized with agents such as lower alkyl halides (e.g. methyl, ethyl, propyl, and butyl chlorides, bromides and iodides), dialkyl sulfates (e.g. dimethyl, diethyl, dibutyl, and diamyl sulfates), long chain halides (e.g. decyl, lauryl, myristyl and stearyl chlorides, bromides and iodides), aralkyl halides (e.g. benzyl and phenethyl bromides), and others.
Further examples of pharmaceutically acceptable salts that may be used with the instant invention include, but are not limited to, fluoride, chloride, bromide and iodide.
In general, salts of compounds are intended to be pharmaceutically acceptable salts within the scope of the invention.
The term “purified”, “in purified form” or “in isolated and purified form” for a compound refers to the physical state of said compound after being isolated from a synthetic process or natural source or combination thereof. Thus, the term “purified”, “in purified form” or “in isolated and purified form” for a compound refers to the physical state of said compound after being obtained
from a purification process or processes described herein or well known to the skilled artisan, and in sufficient purity to be characterized by standard analytical techniques described herein or well known to the skilled artisan. Compounds of the invention include any form of the compound including in situ in a reaction mixture as well as in isolated and purified form obtained by routine techniques. Also included are polymorphic forms of the compounds of the invention and solvates and prodrugs thereof.
Certain compounds of the invention may exist in different tautomeric forms, for example, but are not limited to, ketone/enol tautomeric forms, imine-enamine tautomeric forms, and for example heteroaromatic forms such as the following moieties:
In the same manner, unless indicated otherwise, presenting a structural representation of any tautomeric form of a compound which exhibits tautomerism is meant to include all such tautomeric forms of the compound. Accordingly, where compounds of the invention, their salts, and solvates and prodrugs thereof, may exist in different tautomeric forms or in equilibrium among such forms, all such forms of the compound are embraced by, and included within the scope of the invention.
In another aspect, the present invention provides pharmaceutical compositions comprising one or more compounds of the invention. As used herein, the term “pharmaceutical composition” comprises at least one pharmaceutically active compound and at least one excipient, and is intended to encompass both the combination of the specified ingredients in the specified amounts, and any product which results, directly or indirectly, from combination of the specified ingredients in the specified amounts.
As will be appreciated by the ordinarily skilled artisan, excipients are any constituent which adapts the composition to a particular route of administration or aids the processing of a composition into a dosage form without itself exerting an active pharmaceutical effect. In general compositions comprise more than one excipient depending upon the route of administration and the characteristics of the active being administered. Examples of excipients which impart to the composition properties which make it easier to handle or process include, but are not limited to, lubricants or pressing aids in powdered medicaments intended to be tableted, and emulsion stabilizers in compositions in which the active is present in the form of an emulsion. Examples of excipients which adapt a composition to a desired route of administration are, for example, but not limited to, for oral administration, absorption enhancers promoting absorption from the gastrointestinal tract, for transdermal or
transmucosal administration, penetration enhancers, for example, those employed in adhesive skin "patch" or compositions for buccal administration.
Notwithstanding the function excipients perform in a composition, excipients are collectively termed herein "a carrier". Typically, formulations may comprise up to about 95 percent active ingredient and the balance carrier, although formulations with different ratios may be prepared. In general, acceptable pharmaceutical compositions contain a suitable concentration of the active that an effective amount of the PCSK9 antagonist can be provided in an individual dosage form of acceptable volume based upon the route of administration such that it can provide a therapeutic serum level of the active for an acceptable period of time in a subject to whom the composition is administered and the composition will retain biological activity during storage within an acceptable temperature range for an acceptable period of time.
Pharmaceutical composition, as used herein, refers both to a bulk composition, that is, formulated material that has not yet been formed into individual dosage units for administration, and the composition contained within individual dosage units.
While compositions of the invention may be employed in bulk form, it will be appreciated that for most applications compositions will be incorporated into a dosage form providing individual units suitable for administration to a patient, each dosage form comprising an amount of the selected composition which contains an effective amount of said one or more compounds of Formula I. Examples of suitable dosage forms include, but are not limited to, dosage forms adapted for: (i) oral administration, e.g., a liquid, gel, powder, solid or semi-solid pharmaceutical composition which is loaded into a capsule or pressed into a tablet and may comprise additionally one or more coatings which modify its release properties, for example, coatings which impart delayed release or formulations which have extended release properties; (ii) a dosage form adapted for administration through tissues of the oral cavity, for example, a rapidly dissolving tablet, a lozenge, a solution, a gel, a sachet or a needle array suitable for providing intramucosal administration; (iii) a dosage form adapted for administration via the mucosa of the nasal or upper respiratory cavity, for example a solution, suspension or emulsion formulation for dispersion in the nose or airway; (iv) a dosage form adapted for transdermal administration, for example, a patch, cream or gel; (v) a dosage form adapted for intradermal administration, for example, a microneedle array; (vi) a dosage form adapted for intravenous (IV) infusion, for example, over a prolonged period using an I.V. infusion pump;
(vii) a dosage form adapted for intramuscular administration (IM), for example, an injectable solution or suspension, and which may be adapted to form a depot having extended release properties; (viii) a dosage form adapted for drip intravenous administration (IV), for example, a solution or suspension, for example, as an IV solution or a concentrate to be injected into a saline IV
bag; (ix) a dosage form adapted for subcutaneous administration, including administration over an extended time period by implanting a rod or other device which diffuses the compound into the surround tissue and thereby provides a continuous serum therapeutic level; or (x) a dosage form adapted for delivery via rectal or vaginal mucosa, for example, a suppository.
Pharmaceutical compositions can be solid, semi-solid or liquid. Solid, semi-solid and liquid form preparations can be adapted to a variety of modes of administration, examples of which include, but are not limited to, powders, dispersible granules, mini-tablets, beads, which can be used, for example, for tableting, encapsulation, or direct administration. In addition, liquid form preparations include, but are not limited to, solutions, suspensions and emulsions which for example, but not exclusively, can be employed in the preparation of formulations intended for ingestion, inhalation or intravenous administration (IV), for example, but not limited to, administration via drip IV or infusion pump, intramuscular injection (IM), for example, of a bolus which is released over an extended duration, direct IV injection, or adapted to subcutaneous routes of administration.
Other routes of administration which may be contemplated include intranasal administration, or for administration to some other mucosal membrane. Formulations prepared for administration to various mucosal membranes may also include additional components adapting them for such administration, for example, viscosity modifiers.
Although in some embodiments, compositions suitable for use in a solid oral dosage form, for example, a tablet or quick-melt mouth-dissolving formulation are preferable routes of administration for a compound of the invention or a salt thereof, a composition of the invention may be formulated for administration via other routes mentioned above. Examples include aerosol preparations, for example, suitable for administration via inhalation or via nasal mucosa, may include solutions and solids in powder form, which may be in combination with a pharmaceutically acceptable propellant, for example, an inert compressed gas, e.g. nitrogen. Also included are solid form preparations which are intended to be converted, shortly before use, to a suspension or a solution, for example, for oral or parenteral administration. Examples of such solid forms include, but are not limited to, freeze dried formulations and liquid formulations adsorbed into a solid absorbent medium.
For example, the compounds of the invention may also be deliverable transdermally or transmucosally, for example, from a liquid, suppository, cream, foam, gel, or rapidly dissolving solid form. It will be appreciated that transdermal compositions can take also the form of creams, lotions, aerosols and/or emulsions and can be provided in a unit dosage form which includes a transdermal patch of any know in the art, for example, a patch which incorporates either a matrix comprising the pharmaceutically active compound or a reservoir which comprises a solid or liquid form of the pharmaceutically active compound.
Examples of pharmaceutically acceptable carriers and methods of manufacture for various compositions mentioned above may be found in A. Gennaro (ed.), Remington: The Science and Practice of Pharmacy, 20th Edition, (2000), Lippincott Williams & Wilkins, Baltimore, MD. Additional examples of publications addressing formulation issues may be found in: Pharmaceutical compositions may be formulated by any number of strategies known in the art, see, e.g., McGoff and Scher, 2000 Solution Formulation of Proteins/Peptides: In - McNally, E J., ed. Protein Formulation and Delivery. New York, NY: Marcel Dekker; pp. 139-158; Akers & Defilippis, 2000, Peptides and Proteins as Parenteral Solutions. In - Pharmaceutical Formulation Development of Peptides and Proteins. Philadelphia, PA: Taylor and Francis; pp. 145-177; Akers et ai, 2002, Pharm. Biotechnol. 14:47-127.
In another aspect the present invention provides methods of employing PCSK9-specific antagonist compounds described herein for antagonizing PCSK9 function; said methods of which are further described below. Use of the term “antagonizing” throughout the present application refers to providing to the affected tissue(s) a substance which opposes the action of, inhibits, counteracts, neutralizes or curtails one or more functions of PCSK9 in the affected tissues. Inhibition or antagonism of one or more of PCSK9-associated functional properties can be readily determined according to methodologies known to the art (see, e.g., Barak & Webb, 1981 J. Cell Biol. 90:595- 604; Stephan & Yurachek, 1993 ./. Lipid Res. 34:325330; and McNamara et ai, 2006 Clinica Chimica Acta 369:158-167) as well as those described herein. Inhibition or antagonism will effectuate a decrease in PCSK9 activity relative to that seen in the absence of the antagonist or, for example, that seen relative to the activity observed when a control antagonist of irrelevant specificity is present. Preferably, a PCSK9-specific antagonist in accordance with the present invention antagonizes PCSK9 functioning to the point that there is a decrease of at least 10%, of the measured parameter including but not limited to the activities disclosed herein, and more preferably, a decrease of at least 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 95% of the measured parameter. Such inhibition/antagonism of PCSK9 functioning is particularly effective in those instances where PCSK9 functioning is contributing at least in part to a particular phenotype, disease, disorder or condition which is negatively impacting the subject.
In one aspect, the present invention provides a method for antagonizing the activity of PCSK9, which comprises contacting a cell, population of cells or tissue sample capable of being affected by PCSK9 (i.e., which expresses and/or comprises LDL receptors) with a PCSK9-specific antagonist disclosed herein under conditions that allow said antagonist to bind to PCSK9 when present and inhibit PCSK9's inhibition of cellular LDL uptake. In some embodiments of the present
invention include such methods wherein the cell is a human cell. Additional embodiments of the present invention include such methods wherein the cell is a murine cell.
In one aspect, the present invention provides a method for antagonizing the activity of PCSK9 in a subject, which comprises administering to the subject a therapeutically effective amount of a PCSK9-specific antagonist of the present invention. In some embodiments, the methods for antagonizing PCSK9 function are for the treatment, as defined herein, of a PCSK9-associated disease, disorder or condition or, alternatively, for providing therapy in a disease, disorder or condition that could benefit from the effects of a PCSK9 antagonist.
The present invention, thus, contemplates the use of PCSK9-specific antagonists described herein in various methods of treatment where antagonizing PCSK9 function is desirable. As used herein, the term “method of treatment” relates to a course of action resulting in a change in at least one symptom of a disease state which can be prophylactic or therapeutic in nature. In some embodiments, the present invention relates to a method of treatment for a condition associated with and/or attributed to PCSK9 activity, or a condition where the functioning of PCSK9 is contraindicated for a particular subject, the method comprising administering to the subject a therapeutically effective amount of a PCSK9- antagonist compound of Formula I, or pharmaceutically acceptable salt thereof. In some embodiments, the condition may be atherosclerosis, hypercholesterolemia, coronary heart disease, metabolic syndrome, acute coronary syndrome or related cardiovascular disease and cardiometabolic conditions, or may be a disease state or condition in which PCSK9 activity is contraindicated.
Methods of treatment in accordance with the present invention comprise administering to an individual a therapeutically (or prophylactically) effective amount of a PCSK9-specific antagonist of the present invention. Use of the terms “therapeutically effective” or “prophylactically effective” in reference to an amount refers to the amount necessary at the intended dosage to achieve the desired therapeutic and/or prophylactic effect for the period of time desired. The desired effect may be, for example, the alleviation, amelioration, reduction or cessation of at least one symptom associated with the treated condition. These amounts will vary, as the skilled artisan will appreciate, according to various factors, including but not limited to the disease state, age, sex, and weight of the individual, and the ability of the PCSK9-specific antagonist to elicit the desired effect in the individual. The response may be documented by in vitro assay, in vivo non- human animal studies, and/or further supported from clinical trials.
In some embodiments it is preferred to administer a PCSK9 antagonist compound of the invention in the form of a pharmaceutical composition as described herein.
Dosing of antagonist therapeutics is well within the realm of the skilled artisan, see, e.g., Lederman et ai, 1991 hit. J. Cancer 47:659-664; Bagshawe et ai, 1991 Antibody,
Immunoconjugates and Radiopharmaceuticals 4:915-922, and will vary based on a number of factors, for example, but not limited to, those mentioned above, including the condition of the patient, the area being treated, the route of administration, and the treatment desired, for example, prophylaxis or acute treatment and the like. A physician or veterinarian of ordinary skill can readily determine and prescribe the effective therapeutic amount of the antagonist.
The subject may be in need of, or desire, treatment for an existing disease or medical condition. As used herein, the subject "in need" of treatment of an existing condition encompasses both a determination of need by a medical professional as well as the desire of the subject for such treatment. When a compound or a salt thereof is provided in combination with one or more other active agents, "administration" and its variants are each understood to include provision of the compound or its salt and the other agents contemporaneously or simultaneously or over a course of separate administrations over a period of time. When the agents of a combination are administered at the same time, they can be administered together in a single composition or they can be administered separately. It is understood that a "combination" of active agents can be a single composition containing all of the active agents or multiple compositions each containing one or more of the active agents. In the case of two active agents a combination can be either a single composition comprising both agents or two separate compositions each comprising one of the agents; in the case of three active agents a combination can be either a single composition comprising all three agents, three separate compositions each comprising one of the agents, or two compositions one of which comprises two of the agents and the other comprises the third agent; and so forth.
The compositions and combinations of the present invention are suitably administered in effective amounts. The term “effective amount” means the amount of active compound sufficient to antagonize PCSK9 and thereby elicit the response being sought ( i.e ., induce a therapeutic response in the treatment or management of conditions associated with or impacted by PCSK9 function, including, but not limited to atherosclerosis, hypercholesterolemia, coronary heart disease, metabolic syndrome, acute coronary syndrome, and related cardiovascular disease and cardiometabolic conditions in an animal or human).
The actual dosage employed may be varied depending upon the requirements of the patient and the severity of the condition being treated. Determination of the proper dosage regimen for a particular situation is within the skill in the art, for example, as described in the standard literature, for example, as described in the “Physicians’ Desk Reference” (PDR), e.g., 1996 edition (Medical
Economics Company, Montvale, NJ 07645-1742, USA), the Physician’s Desk Reference, 56th Edition, 2002 (published by Medical Economics company, Inc. Montvale, NJ 07645-1742), or the Physician’s Desk Reference, 57th Edition, 2003 (published by Thompson PDR, Montvale, NJ 07645- 1742); the disclosures of which is incorporated herein by reference thereto. For convenience, the total daily dosage may be divided and administered in portions during the day as required or delivered continuously.
The PCSK9-specific antagonist may be administered to an individual by any route of administration appreciated in the art, including but not limited to oral administration, administration by injection (specific embodiments of which include intravenous, subcutaneous, intraperitoneal or intramuscular injection), or administration by inhalation, intranasal, or topical administration, either alone or in combination with other agents designed to assist in the treatment of the individual. The PCSK9-specific antagonist may also be administered by injection devices, injector pens, needleless devices; and subcutaneous patch delivery systems. The route of administration should be determined based on a number of considerations appreciated by the skilled artisan including, but not limited to, the desired physiochemical characteristics of the treatment.
One or more additional pharmacologically active agents may be administered in combination with a compound of Formula I. An additional active agent (or agents) is intended to mean a pharmaceutically active agent (or agents) that is active in the body, including pro-drugs that convert to pharmaceutically active form after administration, which are different from the compound of Formula I, and also includes free-acid, free-base and pharmaceutically acceptable salts of said additional active agents. Generally, any suitable additional active agent or agents, including but not limited to anti-hypertensive agents, anti-atherosclerotic agents such as a lipid modifying compound, anti-diabetic agents and/or anti-obesity agents may be used in any combination with the compound of Formula I in a single dosage formulation (a fixed dose drug combination), or may be administered to the subject in one or more separate dosage formulations which allows for concurrent or sequential administration of the active agents (co-administration of the separate active agents).
Examples of additional active agents which may be employed include but are not limited to angiotensin converting enzyme inhibitors (e.g., alacepril, benazepril, captopril, ceronapril, cilazapril, delapril, enalapril, enalaprilat, fosinopril, imidapril, lisinopril, moveltipril, perindopril, quinapril, ramipril, spirapril, temocapril, or trandolapril), angiotensin II receptor antagonists (e.g., losartan i.e., COZAAR®, valsartan, candesartan, olmesartan, telmesartan and any of these drugs used in combination with hydrochlorothiazide such as HYZAAR®); neutral endopeptidase inhibitors (e.g., thiorphan and phosphoramidon), aldosterone antagonists, aldosterone synthase inhibitors, renin
inhibitors (e.g. urea derivatives of di- and tri-peptides (See U.S. Pat. No. 5,116,835), amino acids and derivatives (U.S. Patents 5,095,119 and 5,104,869), amino acid chains linked by non-peptidic bonds (U.S. Patent 5,114,937), di- and tri-peptide derivatives, peptidyl amino diols and peptidyl beta- aminoacyl aminodiol carbamates, and small molecule renin inhibitors (including diol sulfonamides and sulfinyls), N-morpholino derivatives, N-heterocyclic alcohols and pyrolimidazolones; also, pepstatin derivatives and fhioro- and chloro-derivatives of statone-containing peptides, enalkrein, RO 42-5892, A 65317, CP 80794, ES 1005, ES 8891, SQ 34017, aliskiren (2(S),4(S),5(S),7(S)-N-(2- carbamoyl-2-methylpropyl)-5-amino-4-hydroxy-2,7-diisopropyl-8-[4-methoxy-3-(3- methoxypropoxy)-phenyl]-octanamid hemifumarate) SPP600, SPP630 and SPP635), endothelin receptor antagonists, phosphodiesterase-5 inhibitors (e.g. sildenafil, tadalfil and vardenafil), vasodilators, calcium channel blockers (e.g., amlodipine, nifedipine, veraparmil, diltiazem, gallopamil, niludipine, nimodipins, nicardipine), potassium channel activators (e.g., nicorandil, pinacidil, cromakalim, minoxidil, aprilkalim, loprazolam), diuretics (e.g., hydrochlorothiazide), sympatholitics, beta-adrenergic blocking drugs (e.g., propranolol, atenolol, bisoprolol, carvedilol, metoprolol, or metoprolol tartate), alpha adrenergic blocking drugs (e.g., doxazocin, prazocin or alpha methyldopa) central alpha adrenergic agonists, peripheral vasodilators (e.g. hydralazine); lipid lowering agents e.g., HMG-CoA reductase inhibitors such as simvastatin and lovastatin which are marketed as ZOCOR® and MEVACOR® in lactone pro-drug form and function as inhibitors after administration, and pharmaceutically acceptable salts of dihydroxy open ring acid HMG-CoA reductase inhibitors such as atorvastatin (particularly the calcium salt sold in LIPITOR®), rosuvastatin (particularly the calcium salt sold in CRESTOR®), pravastatin (particularly the sodium salt sold in PRAVACHOL®), fluvastatin (particularly the sodium salt sold in LESCOL®), crivastatin, and pitavastatin; a cholesterol absorption inhibitor such as ezetimibe (ZETIA®) and ezetimibe in combination with any other lipid lowering agents such as the HMG-CoA reductase inhibitors noted above and particularly with simvastatin (VYTORIN®) or with atorvastatin calcium; niacin in immediate -release or controlled release forms and/or with an HMG-CoA reductase inhibitor; niacin receptor agonists such as acipimox and acifran, as well as niacin receptor partial agonists; metabolic altering agents including insulin and insulin mimetics (e.g., insulin degludec, insulin glargine, insulin lispro), dipeptidyl peptidase-IV (DPP-4) inhibitors (e.g., sitagliptin, alogliptin, omarigliptin, linagliptin, vildagliptin); insulin sensitizers, including (i) PPARy agonists, such as the glitazones (e.g. pioglitazone, AMG 131, MBX2044, mitoglitazone, lobeglitazone, IDR- 105, rosiglitazone, and balaglitazone), and other PPAR ligands, including (1) PPARa/g dual agonists (e.g., ZYH2, ZYH1, GFT505, chiglitazar, muraglitazar, aleglitazar, sodelglitazar, and naveglitazar); (2) PPARa agonists such as fenofibric acid derivatives (e.g., gemfibrozil, clofibrate, ciprofibrate,
fenofibrate, bezafibrate), (3) selective PPARy modulators (SPPARyM’s), (e.g., such as those disclosed in WO 02/060388, WO 02/08188, WO 2004/019869, WO 2004/020409, WO 2004/020408, and WO 2004/066963); and (4) PPARy partial agonists; (ii) biguanides, such as metformin and its pharmaceutically acceptable salts, in particular, metformin hydrochloride, and extended-release formulations thereof, such as Glumetza™, Fortamet™, and GlucophageXR™; and (iii) protein tyrosine phosphatase- IB (PTP-1B) inhibitors (e.g., ISIS-113715 and TTP814); insulin or insulin analogs (e.g., insulin detemir, insulin glulisine, insulin degludec, insulin glargine, insulin lispro and inhalable formulations of each); leptin and leptin derivatives and agonists; amylin and amylin analogs (e.g., pramlintide); sulfonylurea and non-sulfonylurea insulin secretagogues (e.g., tolbutamide, glyburide, glipizide, glimepiride, mitiglinide, meglitinides, nateglinide and repaglinide); a-glucosidase inhibitors (e.g., acarbose, voglibose and miglitol); glucagon receptor antagonists (e.g., MK-3577, MK-0893, LY-2409021 and KT6-971); incretin mimetics, such as GLP-1, GLP-1 analogs, derivatives, and mimetics; and GLP-1 receptor agonists (e.g., dulaglutide, semaglutide, albiglutide, exenatide, liraglutide, lixisenatide, taspoglutide, CJC-1131, and BIM-51077, including intranasal, transdermal, and once-weekly formulations thereof); bile acid sequestering agents (e.g., colestilan, colestimide, colesevalam hydrochloride, colestipol, cholestyramine, and dialkylaminoalkyl derivatives of a cross-linked dextran), acyl CoAxholesterol acyltransferase inhibitors, (e.g., avasimibe); antiobesity compounds; agents intended for use in inflammatory conditions, such as aspirin, non-steroidal anti-inflammatory drugs or NSAIDs, glucocorticoids, and selective cyclooxygenase-2 or COX-2 inhibitors; glucokinase activators (GKAs) (e.g., AZD6370); inhibitors of 11 b-hydroxysteroid dehydrogenase type 1, (e.g., such as those disclosed in U.S. Patent No. 6,730,690, and LY-2523199); CETP inhibitors (e.g., anacetrapib, torcetrapib, and evacetrapib); inhibitors of fructose 1,6-bisphosphatase, (e.g., such as those disclosed in U.S. Patent Nos.
6,054,587; 6,110,903; 6,284,748; 6,399,782; and 6,489,476); inhibitors of acetyl CoA carboxylase- 1 or 2 (ACC1 or ACC2); AMP-activated Protein Kinase (AMPK) activators; other agonists of the G- protein-coupled receptors: (i) GPR-109, (ii) GPR-119 (e.g., MBX2982 and PSN821), and (iii) GPR- 40 (e.g., TAK875); SSTR3 antagonists (e.g., such as those disclosed in WO 2009/001836); neuromedin U receptor agonists (e.g., such as those disclosed in WO 2009/042053, including, but not limited to, neuromedin S (NMS)); SCD modulators; GPR-105 antagonists (e.g., such as those disclosed in WO 2009/000087); SGLT inhibitors (e.g., ASP1941, SGLT-3, empagliflozin, dapagliflozin, canagliflozin, BI- 10773, ertugliflozin, remogloflozin, TS-071, tofogliflozin, ipragliflozin, and LX-4211); inhibitors of acyl coenzyme A:diacylglycerol acyltransferase 1 and 2 (DGAT-1 and DGAT-2); inhibitors of fatty acid synthase; inhibitors of acyl coenzyme A:monoacylglycerol acyltransferase 1 and 2 (MGAT-1 and MGAT-2); agonists of the TGR5
receptor (also known as GPBAR1, BG37, GPCR19, GPR131, and M-BAR); ileal bile acid transporter inhibitors; PACAP, PACAP mimetics, and PACAP receptor 3 agonists; PPAR agonists; protein tyrosine phosphatase- IB (PTP-1B) inhibitors; IL-lb antibodies, (e.g., XOMA052 and canakinumab); and bromocriptine mesylate and rapid-release formulations thereof; or with other drugs beneficial for the treatment of the above-mentioned conditions or disorders including the free- acid, free-base, and pharmaceutically acceptable salt forms of the above active agents where chemically possible.
The compounds of the present invention can be readily prepared according to the following reaction schemes and examples, or modifications thereof, using readily available starting materials, reagents and conventional synthesis procedures. In these reactions, it is also possible to make use of known variants. For purification of the compounds using reverse phase chromatography (either HPLC or MPLC, as noted below), a C 18 column was used. Other methods for preparing compounds of the invention will be readily apparent to the person of ordinary skill in the art in light of the following reaction schemes and examples. Abbreviations listed below may be used in the exemplary schemes and/or examples herein.
Abbreviations
ACN is acetonitrile; AcOH is acetic acid; Boc is t-butoxycarbonyl; B0C2O is di-tert-butyl dicarbonate; BnBr is benzyl bromide; BzCl is benzoyl chloride; CBr4 is perbromomethane or tetrabromomethane; Cbz-Cl is benzyl chloroformate; Cbz-OSu is is N- (benzyloxycarbonyloxy)succinimide; CD3OD is deuterated methanol; CDCI3 is deuterated chloroform; CS2CO3 is cesium carbonate; DCC is N,N'-Dicyclohexylcarbodiimide; DCE is 1,2- dichloroethane; DCM is dichloromethane; D-Dap(Boc)-OMe is methyl (S)-2-amino-3-((tert- butoxycarbonyl)amino)propanoate; DIEA or DIPEA is N,N-diisopropylethylamine; DMF is N,N- dimethylformamide; DMAP is 4-dimethylaminopyridine; DMSO is dimethyl sulfoxide; DIAD is (E)-diisopropyl diazene-l,2-dicarboxylate; DMP is Dess-Martin periodinane; Et3N is triethylamine; EA or EtOAc is ethyl acetate; Et20 is diethyl ether; EtOH is ethanol; Fmoc is fluorenylmethyloxycarbonyl protecting group; Fmoc-Cl is (9H-fluoren-9-yl)methyl carbonochloridate; Fmoc-Osu is Fmoc N-hydroxysuccinimide ester; HATU is 1 - [bis(dimethylamino)methylene]-lH-l,2,3-triazolo[4,5-b]pyridinium 3-oxid hexafluorophosphate; HPLC is high pressure liquid chromatography; IPA is isopropyl alcohol; IPAc is isopropyl acetate; LC/MS or LCMS is liquid chromatography mass spectrometry; LiOH is lithium hydroxide; Me is methyl; MeOH is methanol; Mel is methyl iodide; MgSCE is magnesium sulfate; MPLC is medium pressure liquid chromatography; MTBE is methyl tert-butyl ether; Na2SC>4 is sodium sulfate;
NaHC(¾ is sodium bicarbonate; Na2C(¾ is sodium carbonate; NaBI l iCN is sodium cyanoborohydride; NaBH(OAc)3 is sodium triacetoxyborohydride; NaN3 is sodium azide; NH4CI is ammonium chloride; NH4HCO3 is ammonium bicarbonate; NMR is Nuclear Magnetic Resonance; NsCl is 4-nitrobenzene- 1-sulfonyl chloride; Oxyma is ethyl 2-cyano-2-(hydroxyimino)acetate; Pd/C is palladium on carbon; PE is petroleum ether; Pd2(dba)3(HCCl3) is tris(dibenzylideneacetone)dipalladium(0)-chloroform adduct; PPI13 or PI13P is triphenylphosphine; Pd(dppf)Cl2.CH2Cl2 is dichloro[l,l'-bis(diphenylphosphino)ferrocene]palladium(II) dichloromethane adduct; Pd(PPh3)4 is tetrakis(triphenylphosphine)palladium; RP Flash is Reverse Phase Flash Chromatography; RT or r.t. or rt is room temperature; S-Phos is 2-dicyclohexylphosphino-2',6'- dimethoxybiphenyl; TBAB is tetrabutylammonium bromide; TBAF is tetrabutylammonium fluoride; TBAHS is tetrabutylammonium hydrogenosulfate; TEA is triethylamine; TFA is trifluoroacetic acid; THF is tetrahydrofuran; Tf20 is trifluoromethanesulfonic anhydride; TMS-diazomethane is trimethylsilyl-diazomethane and Zhan IB is Dichloro[l,3-bis(2,4,6-trimethylphenyl)-2- imidazolidinylidene][[5-[(dimethylamino)sulfonyl]-2-(l-methylethoxy-0)phenyl]methylene- C]ruthenium(II).
The compounds of the present invention can be readily prepared according to the following reaction schemes and examples, or modifications thereof, in conjunction with readily available starting materials, reagents and conventional synthesis procedures. Alternate salt forms for products and intermediates may also be present in the invention. Alternate methods for preparing compounds of the invention will be readily apparent to the person of ordinary skill in the art in light of the following reaction schemes and examples. For example, in these reactions it is possible to make use of known variants. Immediately following is a section describing the preparation of intermediates useful in the preparation of example compounds of the invention. Unless otherwise noted, reagents used in the preparation of intermediates and examples are commercially available or can be prepared by known methods.
Step A: (R)-tert-butyl 3-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-2- (((benzyloxy)carbonyl)amino)propanoate A-1
To a stirred mixture of (7?)-3-((((9ii-fluoren-9-yl)methoxy)carbonyl)amino)-2- (((benzyloxy)carbonyl)amino)propanoic acid (5.00 g, 10.9 mmol) in DCM (100 mL) was added (E)- ieri-butyl L/,/V-diisopropylcarbamimidate (10.9 g, 54.3 mmol) at ambient temperature. The resulting mixture was stirred for 1 h at 40 °C. The reaction mixture was filtered. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography, eluted with 30-60% EA in PE to obtain (R)-tert- butyl 3-((((9T/-fluoren-9-yl)methoxy)carbonyl)amino)-2- (((benzyloxy)carbonyl)amino)propanoate A-1. LCMS (ESI) calc’d for C30H32N2O6 [M + Na]+: 539.2, found 539.3.
Step B: (S)-tert-butyl 4-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-2-aminobutanoate hydrochloride A-2
To a stirred solution of (S)-tert- butyl 4-((((9T/-fluoren-9-yl)methoxy)carbonyl)amino)-2- (((benzyloxy)carbonyl)amino)butanoate A-1 (4.0 g, 7.54 mmol) in THF (100 mL) was added Pd/C (10% wt, dry) (0.802 g, 0.754 mmol) under nitrogen atmosphere. The reaction mixture was degassed with hydrogen three times and stirred at room temperature for 16 h under hydrogen. The mixture was filtered. The filtrate was added 4 M HCI in dioxane (1.89 mL, 7.54 mmol). The mixture was concentrated under reduced pressure. The residue was added Et20 (100 mL) and stirred for 30 min and filtered. The filter cake was dried to afford (S)-tert- butyl 4-((((9T/-fluoren-9-
yl)methoxy)carbonyl)amino)-2-aminobutanoate hydrochloride A-2. LCMS (ESI) calc’d for C22H27CIN2O4 [M - HC1 + H]+: 383.2, found 383.3.
Step C: (S)-l-((S)-2-((2S,3R)-3-(tert-butoxy)-2-((tert-butoxycarbonyl)amino)butanamido)-3-(4- methoxyphenyl)propanoyl)-2-methylpyrrolidine-2-carboxylic acid A To a solution of (S)-mcthyl 1 -((.S')-2-((2.S',3//)-2-amino-3-(te/7-butoxy)butanamido)-3-(4- methoxyphenyl)propanoyl)-2-methylpyrrolidine-2-carboxylate A-2 (2.95 g, 6.18 mmol) in THF (30 mL) was added 2 M LiOH (12.4 mL, 24.7 mmol) at room temperature. The reaction mixture was stirred at 45 °C for 48 h. The reaction mixture was cooled to 0 °C and added 1 M HC1 (24.7 mL). The above mixture were added NaHCCL (2.07 g, 24.9 mmol) and B0C2O (2.86 mL, 12.3 mmol) at 0 °C. The mixture was stirred at room temperature for 16 h. The mixture was added 1 M HC1 (25 mL) at 0 °C, extracted with EA (100 mL). The organic layer was washed with brine (50 x 2 mL), dried over anhydrous MgSCL and filtered. The filtrate was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 0% - 8% MeOH in DCM to afford (S)- 1 -((.S')-2-((2.S',3//)-3-(te/7-butoxy)-2-((te/7-butoxycarbonyl)amino)butanamido)-3-(4- methoxyphenyl)propanoyl)-2-methylpyrrolidine-2-carboxylic acid A. LCMS (ESI) calc’d for C29H45N3O [M + H]+: 564.3, found 564.2.
Preparation of intermediate B
Step A: Tert-butyl (2-(3-oxoisoindolin-5-yl)ethyl)carbamate B-1
To a solution of 6-bromoisoindolin- 1 -one (4.00 g, 18.9 mmol) in toluene (210 mL) and water (70 mL) were added potassium (2-((ter/-butoxycarbonyl)amino)ethyl)trifluoroborate (5.21 g, 20.8 mmol), PdCl2(dppf)2 (0.350 g, 0.470 mmol) and CS2CO3 (18.4 g, 56.6 mmol) under N2. The reaction mixture was stirred for 14 h at 80 °C. The solution was allowed to warm to 25 °C and saturated NH4CI (200 mL) was added. The aqueous mixture was extracted with EA (3 x 250 mL), and the combined organic layer was washed with brine (3 x 100 mL). The organic layer was dried over anhydrous Na2SC>4 and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by a silica gel column chromatography, eluted with gradient 1 % - 100% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford fe/7-butyl (2-(3-oxoisoindolin-5-yl)ethyl)carbamate B-1. LCMS (ESI) calc’d for C15H20N2O3
[2M + H]+: 553.3, found 553.4; ‘H NMR (300 MHz, CDCI3) d 7.74 (s, 1H), 7.68 (s, 1H), 7.41 (s,
2H), 4.64 (br, 1H), 4.43 (s, 2H), 3.43-3.37 (m, J= 6.1 Hz, 2H), 2.90 (t, J = 7.0 Hz, 2H), 1.42 (s, 9H). Step B: 6-(2-aminoethyl)isoindolin-l-one B-2
To a solution of HC1 (4 M) in 1,4-Dioxane (150 mL) was added fe/7-butyl (2-(3-oxoisoindolin-5- yl)ethyl)carbamate (15.0 g, 54.3 mmol) at 0 °C. The reaction mixture was stirred for 2 h at 25 °C. The solution was concentrated under reduced pressure to afford 6-(2-aminoethyl)isoindolin- 1 -one B- 2. LCMS (ESI) calc’d for C10H12N2O [M + H]+: 177.1, found 177.2.
Step C: Benzyl (2-(3-oxoisoindolin-5-yl)ethyl)carbamate B-3
To a solution of 6-(2-aminoethyl)isoindolin- 1 -one B-2 (2.50 g, 14.2 mmol) in THF (10 mL) and water (10 mL) were added Cbz-Cl (4.84 g, 28.4 mmol) andNaHCCL (3.58 g, 42.6 mmol) at 0 °C. The reaction mixture was stirred for 14 h at 25 °C. The resulting solution was diluted with water (50 mL) and the aqueous layer was extracted with EA (3 x 100 mL). The combined organic layer was washed with brine (3 x 100 mL) and dried over anhydrous Na2S04 and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by a silica gel column chromatography, eluted with gradient 1 % - 100% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford benzyl (2-(3-oxoisoindolin-5- yl)ethyl)carbamate B-3. LCMS (ESI) calc’d for C18H18N2O3 [M + H]+: 311.1, found 311.2; ¾ NMR (300 MHz, CDCI3) d 7.67 (s, 1H), 7.37 (s, 3H), 7.31 (d, J = 3.1 Hz, 4H), 5.06 (s, 2H), 4.91 (br, 1H), 4.37 (s, 2H), 3.45 (d, J = 8.4 Hz, 2H), 2.90 (t, J = 7.0 Hz, 2H).
Step D: Tert-butyl 6-(2-(((benzyloxy)carbonyl)amino)ethyl)-l-oxoisoindoline-2-carb oxylate B-4
To a solution of benzyl (2-(3-oxoisoindolin-5-yl)ethyl)carbamate B-3 (500 mg, 1.61 mmol) in THF (5 mL) were added B0C2O (422 mg, 1.93 mmol) and DMAP (394 mg, 3.22 mmol) at 0 °C. The reaction mixture was stirred for 14 h at 25 °C. The resulting solution was concentrated under reduced pressure. The residue was purified by a silica gel column chromatography, eluted with gradient 1 % - 60% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford feri-butyl 6-(2-(((benzyloxy)carbonyl)amino)ethyl)- 1 -oxoisoindoline-2- carboxylate B-4. LCMS (ESI) calc’d for C23H26N2O5 [M + H]+: 411.2, found 411.3; ' l l NMR (300 MHz, CDCb) d 7.72 (s, 1H), 7.50-7.23 (m, 7H), 5.08 (s, 2H), 4.78 (br, 1H), 4.72 (s, 2H), 3.48 (d, J = 6.3 Hz, 2H), 2.92 (t, J = 6.8 Hz, 2H), 1.25 (s, 9H).
Step E: 5-(2-(((benzyloxy)carbonyl)amino)ethyl)-2-(((tert-butoxycarbonyl)amino)methy l)benzoic acid B-5
To a solution of fe/7-butyl 6-(2-(((benzyloxy)carbonyl)amino)ethyl)-l-oxoisoindoline-2-carboxylate B-4 (12.5 g, 30.5 mmol) in THF (120 mL) and water (120 mL) was added LiOH (1.46 g, 60.9 mmol)
at 0 °C. The reaction mixture was stirred for 16 h at 25 °C. The resulting solution was adjusted pH to 4~5 with HC1 (1M). The solution was extracted with EA (3 x 300 mL) and the combined organic layer was washed with brine (3 x 100 mL), dried over anhydrous Na2S04 and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by a silica gel column chromatography, eluted with gradient 1% - 10% MeOH in DCM. The fractions containing desired product were combined and concentrated under reduced pressure to afford 5-(2- (((bcnzyloxy)carbonyl)amino)cthyl)-2-(((fe/7-butoxycarbonyl)amino)mcthyl)bcnzoic acid B-5. LCMS (ESI) calc’d for C23H28N2O6 [M + H]+: 429.2, found 429.3; *H NMR (300 MHz, CDCI3) d 7.99 (s, 2H), 7.33 (t, J = 5.1 Hz, 8H), 5.09 (s, 2H), 4.53 (d, J= 6.2 Hz, 2H), 3.46 (d, J= 6.5 Hz, 2H), 2.88-2.81 (m, 2H), 1.46 (s, 9H).
Step F: Benzyl (4-(((tert-butoxycarbonyl)amino)methyl)-3-(hydroxymethyl)phenethyl) carbamate
B-6
To a solution of 5-(2-(((benzyloxy)carbonyl)amino)ethyl)-2-(((fe/7- butoxycarbonyl)amino)methyl)benzoic acid (10.3 g, 24.1 mmol) in THF (100 mL) was added borane (0.670 g, 48.1 mmol) at -40 °C. The reaction mixture was stirred for 4 h at room temperature. The resulting solution was concentrated under reduced pressure. The residue was purified by a silica gel column chromatography, eluted with gradient 1 % - 60% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford benzyl (4 -(((tert- butoxycarbonyl)amino)methyl)-3-(hydroxymethyl)phenethyl)carbamate B-6. LCMS (ESI) calc’d for C23H30N2O5 [M + Na]+: 437.2, found 437.1; ‘HNMR (300 MHz, CDCb) d 7.34 (s, 5H), 7.28-7.22 (m, 1H), 7.15-7.08 (m, 2H), 5.19 (br, 1H), 5.07 (s, 2H), 4.87 (br, 1H), 4.66 (s, 2H), 4.33 (d, J= 5.2 Hz, 2H), 3.46-3.39 (m, J= 6.8 Hz, 2H), 2.78 (t, J= 7.0 Hz, 2H), 1.42 (s, 9H).
Step G: Tert-butyl 4-(2-aminoethyl)-2-(hydroxymethyl)benzylcarbamate B-7 To a solution of benzyl (4-( ( ( fe/7-butoxycarbonyl )am i no )methyl )-3-
(hydroxymethyl)phenethyl)carbamate B-6 (8.10 g, 19.5 mmol) in EA (500 mL) was added palladium (1.60 g, 14.9 mmol, dry) at 25 °C under nitrogen atmosphere. The mixture was degassed with hydrogen for 3 times and stirred for 4 h at room temperature. The reaction mixture was filtered and the filtrate was concentrated under reduced pressure to afford feri-butyl 4-(2-aminoethyl)-2- (hydroxymethyl)benzylcarbamate B-7. LCMS (ESI) calc’d for C15H24N2O3 [M + H]+: 281.2, found 281.2.
Step FI: (9H-fluoren-9-yl)methyl (4-(((tert-butoxycarbonyl)amino)methyl)-3-(hydroxyl methyl)phenethyl)carbamate B-8
To a solution of fe/7-butyl 4-(2-aminoethyl)-2-(hydroxymethyl)benzylcarbamate B-7 (3.80 g, 13.6 mmol) in THF (30 mL) and water (30 mL) were added Fmoc-Cl (5.26 g, 20.3 mmol) andNaHCCE
(3.40 g, 40.7 mmol) at 0 °C. The reaction mixture was stirred for 14 h at 25 °C. The resulting solution was diluted with water (50 mL) and the aqueous layer was extracted with EA (3 x 200 mL). The combined organic layer was washed with brine (3 x 150 mL) and dried over anhydrous Na2S04 and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by a silica gel column chromatography, eluted with gradient 1% - 60% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford(9/Y- fluoren-9-yl)methyl(4-(((/eri-butoxycarbonyl)amino)methyl)-3-(hydroxymethyl) phenethyl)carbamate B-8. LCMS (ESI) calc’d for C30H34N2O5 [M +Na]+: 525.3, found 525.4; 111 NMR (300 MHz, CDCI3) d 7.76 (d, J = 7.5 Hz, 2H), 7.57 (d, J = 7.4 Hz, 2H), 7.46-7.20 (m, 5H), 7.20-7.05 (m, 2H), 4.87 (br, 1H), 4.68 (s, 2H), 4.44-4.31 (m, 4H), 4.19 (t, J = 7.0 Hz, 1H), 3.43 (d, J = 6.8 Hz, 2H), 2.79 (t, J= 6.9 Hz, 2H), 1.43 (s, 9H).
Step I: 5-(2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)ethyl)-2-(((tert-butoxycarbon yl) amino)methyl)benzyl methanesulfonate B-9
To a solution of (9ii-fluoren-9-yl)methyl (4-(((ter/-butoxycarbonyl)amino)methyl)-3 -(hydroxyl methyl)phenethyl)carbamate B-8 (4.00 g, 7.96 mmol) in DCM (200 mL) were added MsCl (2.56 g, 22.3 mmol) and TEA (3.20 g, 31.8 mmol). The reaction mixture was stirred for 4 h at -40 °C. The resulting solution was washed with 1% HC1 (3 x 50 mL) and saturated NaHC03 (3 x 50 mL). The organic layer was washed with brine (3 x 50 mL) and dried over anhydrous Na2S04 and filtered. The filtrate was concentrated under reduced pressure to afford 5-(2-((((9ii-fluoren-9- yl)methoxy)carbonyl)amino)ethyl)-2-(((ter/-butoxycarbonyl)amino)methyl) benzyl methanesulfonate B-9. LCMS (ESI) calc’d for C31H36N2O7S [M + Na]+: 603.2, found 603.3.
Step J: (9H-fluoren-9-yl)methyl (3-(azidomethyl)-4-(((tert-butoxycarbonyl)amino)methyl) phenethyl)carbamate B-10
To a solution of 5-(2-((((9ii-fluoren-9-yl)methoxy)carbonyl)amino)ethyl)-2-(((feri- butoxycarbonyl)amino)methyl) benzyl methanesulfonate B-9 (8.80 g, 15.2 mmol) in DMSO (35 mL) was added NaN3 (3.94 g, 60.6 mmol). The reaction mixture was stirred for 1 h at 25 °C. The resulting solution was diluted with water (100 mL) and the aqueous layer was extracted with EA (3 x 200 mL). The combined organic layer was washed with brine (3 x 150 mL) and dried over anhydrous Na2SC>4 and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by a silica gel column chromatography, eluted with gradient 1 % - 60% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford (9 H- fluoren-9-yl)methyl (3-(azidomethyl)-4-(((ter/-butoxycarbonyl)amino) methyl)phenethyl)carbamate B-10. LCMS (ESI) calc’d for C30H33N5O4 [M + Na]+: 550.3, found 550.3; ¾ NMR (300 MHz,
DMSO-i¾ d 7.87 (d, J = 7.5 Hz, 2H), 7.66 (d, J = 7.4 Hz, 2H), 7.46-7.26 (m, 5H), 7.21-7.12 (m, 3H), 4.48 (s, 2H), 4.33-4.06 (m, 5H), 3.18 (d, J= 7.2 Hz, 2H), 2.69 (t, J = 7.5 Hz, 2H), 1.37 (s, 9H). Step K: (9H-fluoren-9-yl)methyl 4-(aminomethyl)-3-(azidomethyl)phenethylcarbamate 2,2,2- trifluoroacetate B-ll
To a solution of (9F/-fluoren-9-yl)methyl (3-( azidomcthyl )-4-(((tert- butoxycarbonyl)amino)methyl)phenethyl)carbamate B-10 (5.0 g, 9.48 mmol) in DCM (50 mL) was added TFA (50 mL) at -10 °C. The mixture was stirred at RT for 2 h. The resulting mixture was concentrated under reduced pressure to afford ( 9 //- P u o r c n - 9 -yl ) m e th yl 4-(aminomethyl)-3- (azidomethyl)phenethylcarbamate 2,2,2-trifluoroacetate B-ll. LCMS (ESI) calc’d for C27H26F3N5O4 [M - TFA + H]+: 428.2, found 428.3.
Step L: Ethyl 7-((4-(2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)ethyl)-2- (azidomethyl)benzyl)amino)-7-oxoheptanoate B-12
To a solution of 7-ethoxy-7-oxoheptanoic acid (1.77 g, 9.42 mmol) in DMF (50 mL) were added (9F/-fluoren-9-yl)methyl 4-(aminomethyl)-3-(azidomethyl)phenethylcarbamate 2,2,2-trifluoroacetate
B-ll(5.10 g, 9.42 mmol), HATU (3.58 g, 9.42 mmol) and DIEA (7.30 g, 56.5 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The mixture was diluted with brine (200 mL), extracted with EA (2 x 200 mL), washed brine (2 x 100 mL), dried over anhydrous MgSCL and filtered, the filtrate was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 1% - 6% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford ethyl 7-((4-(2-((((9//-fluoren-9- yl)methoxy)carbonyl)amino)ethyl)-2-(azidomethyl)benzyl)amino)-7-oxoheptanoate B-12. LCMS (ESI) calc’d for C34H39N5O5 [M + H]+: 598.3, found 598.2.
Step M: Ethyl 7-((4-(2-aminoethyl)-2-(azidomethyl)benzyl)amino)-7-oxoheptanoate B To a solution of ethyl 7-((4-(2-((((9F -fluoren-9-yl)methoxy)carbonyl)amino)ethyl)-2- (azidomethyl)benzyl)amino)-7-oxoheptanoate B-12 (5.00 g, 8.37 mmol) in DCM (20 mL) were added ACN (20 mL), piperidine (3.56 g, 41.8 mmol) at 0 °C. The mixture was stirred at rt for 4 h. The mixture was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 1% - 20% MeOH in DCM to afford ethyl 7-((4-(2- aminoethyl)-2-(azidomethyl)benzyl)amino)-7-oxoheptanoate B LCMS (ESI) calc’d for C19H29N5O3 [M + H]+: 376.2, found 376.2.
Step A: (S)-3-(3-allylphenyl)-2-aminopropanoic acid C-1
To a stirred solution of (S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(3- allylphenyl)propanoic acid (500 mg, 1.17 mmol) in DCM (40 mL) was added DEA (10 mL, 1.17 mmol) at room temperature. The mixture was stirred at room temperature for 16 h and concentrated under reduced pressure. The residue was added water (30 mL) and washed with MTBE (2 x 50 mL), the aqueous phase was concentrated under reduced pressure to afford (S)-3-(3-allylphenyl)-2- aminopropanoic acid C-1. LCMS (ESI) calc’d for C12H15NO2 [M + H]+: 206.1, found 206.0. StepB: (S)-3-(3-allylphenyl)-2-((tert-butoxycarbonyl)amino)propanoic acid C-2
To a solution of (.S)-3-( 3 -allyl phenyl )-2-aminopropanoic acid C-1 (300 mg, 1.02 mmol) in DCM (20 mL) were added DIPEA (1.07 mL, 6.14 mmol) and B0C2O (0.71 mL, 3.07 mmol) at room temperature. The mixture was stirred at room temperature for 24 h under argon atmosphere. The
reaction solution was concentrated under reduced pressure. The residue was diluted with water (20 mL) and the pH value of the solution was adjusted to 3 with aqueous HC1 (1 M). The aqueous phase was extracted with EA (2 x 20 mL). The combined organic layer was washed with brine (30 mL), dried over anhydrous MgSCL and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by flash (Column: flash C18 120 g; Mobile Phase A: water, Mobile Phase B: ACN; Plow rate: 45 mL/min; Gradient: 10% B to 20% B in 10 min, 20% B to 80% B in 25 min; Detector: UV 220 nm; Rt= 30 min) to afford (.S')-3-(3-allylphcnyl)-2-((te/7- butoxycarbonyl)amino)propanoic acid C-2. LCMS (ESI) calc’d for C17H23NO4 [M + H - 56]+: 250.1, found 250.1; ‘HNMR (300 MHz, CD3OD): d 7.13 (t, J = 7.6 Hz, 1H), 7.08-6.93 (m, 3H), 5.92 (m, 1H), 5.08-4.93 (m, 2H), 4.17 (dd, J = 8.3, 4.8 Hz, 1H), 3.31 (d, .7= 6.6 Hz, 2H), 3.13 (dd , J = 13.7, 4.7 Hz, 1H), 2.84 (dd, J= 13.7, 8.2 Hz, 1H), 1.40-1.20 (m, 9H).
Step C: (2S,3S)-l-(tert-butoxycarbonyl)-3-hydroxypyrrolidine-2-carboxylic acid C-3 To a solution of (25,,3S)-3-hydroxypyrrolidine-2-carboxylic acid (9.00 g, 68.6 mmol) in DCM (180 mL) were added DIEA (24.0 mL, 137 mmol) and B0C2O (17.5 mL, 75 mmol) at room temperature. The mixture was stirred at room temperature for 24 h under argon atmosphere. The reaction solution was extracted with aq. NaOH (100 mL, 1M). The aqueous phase was cooled to 0°C. The pH value of the aqueous phase was adjusted to 2 with aqueous HC1 (1 M). The aqueous phase was extracted with 2-Me-THP (100 mL). The aqueous phase was re-acidified and extracted with 2-Me-THP (100 mL). The combined organic layer was dried over anhydrous MgSCL and filtered. The filtrate was concentrated under reduced pressure. The residue was dissolved in MTBE (200 mL) and stirred at room temperature for 2 h. The solid was filtered and washed with MTBE to give (25,,3S)-l-(tert- butoxycarbonyl)-3-hydroxypyrrolidine-2-carboxylic acid C-3. LCMS (ESI) calc’d for C10H17NO5 [M + H - Boc]+: 131.1, found 131.3; 1H NMR (300 MHz, CD3OD): d 4.40-4.30 (m, 1H), 4.20-4.10 (m, 1H), 3.60-3.43 (m, 2H), 2.10-1.75 (m, 2H), 1.50-1.30 (m, 9H).
Step D: ( S)-2-amino-3-(3-(2-(tert-butoxy)-2-oxoethyl)phenyl)propanoic acid C-4
To a solution of (25,,3S)-l-(ter/-butoxycarbonyl)-3-hydroxypyrrolidine-2-carboxylic acid C-3 (1.50 g, 6.49 mmol) in DML (20 mL) was added NaH (0.65 g, 16.2 mmol, 60% in mineral oil) at 0 °C under argon atmosphere. After the reaction mixture was stirred for 15 minutes, 3-bromoprop-l-ene (1.96 g, 16.2 mmol) was added to the mixture at 0 °C. The reaction mixture was stirred for 3 h at 0 °C. The reaction mixture was quenched by ice water (1.7 mL). Carefully added 1M NaOH (7.4 mL) to hydrolyze ester, removed ice bath, stirred at room temperature for 20 hours. The reaction was poured into water (120 mL), extracted with EA (2 x 30 mL). The pH value of the aqueous phase was adjusted to 3 with aqueous HC1 (1 M). The aqueous phase was extracted with DCM (3 x 20 mL).
The combined organic layer was washed with brine (30 mL), dried with anhydrous MgS04 and
filtered. The filtrate was concentrated under reduced pressure to give (25,,3S)-3-(allyloxy)-l-(teri- butoxycarbonyl)pyrrolidine-2-carboxylic acid C-4. LCMS (ESI) calc’d for C13H21NO5 [M + H - Boc]+: 172.1, found 171.9; ‘H NMR (400 MHz, CDCI3) d 5.95-5.80 (m, 1H), 5.42-5.08 (m, 2H), 4.40-4.25 (m, 1H), 4.22-3.93 (m, 3H), 3.75-3.42 (m, 2H), 2.17-1.89 (m, 2H), 1.50-1.35 (m, 9H).
Step E: (2S,3S) 1-tert-butyl 2-methyl 3-(allyloxy)pyrrolidine- 1 ,2-dicarboxylate C-5 To a solution of (25,,3S)-3-(allyloxy)-l-(ter/-butoxycarbonyl)pyrrolidine-2-carboxylic acid C-4 (6.00 g, 5.53 mmol) (purity: 25%) in DMF (10 mL) were added NaHC(¾ (930 mg, 11.1 mmol) and Mel (1.73 mL, 27.6 mmol) at room temperature. The mixture was stirred at room temperature for 24 h. The reaction solution was diluted with water (120 mL), extracted with MTBE (2 x 200 mL). The combined organic layer was washed with water (100 mL), brine (2 x 100 mL), dried over anhydrous MgSCL and filtered. The filtrate was concentrated under reduced pressure to give (2S, 3S)- 1 -feri-butyl 2-methyl 3-(allyloxy)pyrrolidine-l,2-dicarboxylate C-5. LCMS (ESI) calc’d for C14H23NO5 [M + NH4]+: 186.1, found 186.0; 'H NMR (400 MHz, CDCI3) d 5.98-5.80 (m, 1H), 5.33 (d, J= 17.2 Hz, 1H), 5.24 (d, J = 10.4 Hz, 1H), 4.46-4.25 (m, 1H), 4.13-3.99 (m, 3H), 3.77(d, J= 2.5 Hz, 3H), 3.71- 3.47 (m, 2H), 2.20-2.0 (m, 2H), 1.49 (s, 4H), 1.44 (s, 5H).
Step F: (2 S, 3 S) -methyl 3-(allyloxy)pyrrolidine-2-carboxylate hydrochloride C-6
To a solution of HC1 (15 mL, 4 M in dioxane) was added (2S,3S)- 1 -feri-butyl 2-methyl 3- (allyloxy)pyrrolidine- 1 ,2-dicarboxylate C-5 (1.6 g, 5.61 mmol) at room temperature. The mixture was stirred at room temperature for 2 h. The reaction solution was concentrated under reduced pressure. The residue was crystallized from heptane to afford (25,,3S)-methyl 3-(allyloxy)pyrrolidine- 2-carboxylate hydrochloride C-6. LCMS (ESI) calc’d for C9H16CINO3 [M + H - HC1]+: 186.1, found 185.9; 'HNMR (300 MHz, CDCI3) d 11.06 (br, 1H), 9.51 (br, 1H), 5.96-5.76 (m, 1H), 5.40-5.20 (m, 2H), 4.44 (s,lH), 4.33 (q, J = 4.1, 3.2 Hz, 1H), 4.20-4.00 (m, 1H), 3.98-3.85 (m, 1H), 3.84 (s, 3H), 3.71-3.50 (m, 2H), 2.20-2.06 (m, 2H).
Step G: (2 S, 3 S) -methyl 3-(allyloxy)-l-((S)-2-((tert-butoxycarbonyl)amino)-3-(5-fluoro-lH-indol-3- yl)propanoyl)pyrrolidine-2-carboxylate C- 7
To a solution of (2.S, 3. S')- methyl 3-(allyloxy)pyrrolidine-2-carboxylate hydrochloride C-6 (400 mg, 1.80 mmol) in DMF (5 mL) were added (S)-2-((ter/-butoxycarbonyl)amino)-3-(5-fluoro-lii-indol-3- yl)propanoic acid (582 mg, 1.80 mmol), HATU (686 mg, 1.80 mmol), and DIEA (0.630 mL, 3.61 mmol) at 0 °C. The mixture was stirred at rt. for 1 h. The reaction solution was diluted with water (20 mL) and extracted with EA (20 mL). The combined organic layer was washed with brine (2 x 10 mL), dried over anhydrous MgSCL and filtered. The filtrate was concentrated under reduced pressure and the residue was purified by a silica gel column chromatography, eluted with gradient 10% - 60%
EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford (2.S, 3. S')- methyl 3-(allyloxy)-l-((S)-2-((tert-butoxycarbonyl)amino)-3-(5-fhioro- lii-indol-3-yl)propanoyl)pyrrolidine-2-carboxylate C-7. LCMS (ESI) calc’d for C25H32FN3O6 [M + H]+: 490.2, found 490.2. *H NMR (400 MHz, CDCb) d 8.07 (br, 1H), 7.36 (d, J = 9.9 Hz, 1H), 7.28-7.21 (m, 2H), 6.95 (t, J = 8.9 Hz, 1H), 5.96-5.80 (m, 1H), 5.39-5.14 (m, 3H), 4.79 (br, 1H), 4.63 (s, 1H), 4.16-3.91 (m, 2H), 3.78 (s, 3H), 3.76 -3.67 (m, 2H), 3.34-3.06 (m, 2H), 2.08-1.94 (m, 2H), 1.47-1.41 (m, 9H).
Step H: (2 S, 3 S) -methyl 3-(allyloxy)-l-((S)-2-amino-3-(5-fluoro-lH-indol-3- yl)propanoyl)pyrrolidine-2-carboxylate hydrochloride C-8
To a solution of HC1 (5 mL, 4 M in 1,4-dioxane) was added (2.S, 3. ')- methyl 3-(allyloxy)- 1 -((.S')-2- ((fer/-butoxycarbonyl)amino)-3-(5-fluoro-lii-indol-3-yl)propanoyl)pyrrolidine-2-carboxylate C-7 (500 mg, 1.02 mmol) at room temperature. The mixture was stirred at room temperature for 1 h. The reaction solution was concentrated under reduced pressure to afford (25,,3S)-methyl 3-(allyloxy)-l- ((5)-2-amino-3-(5-fluoro- 1 //-indol-3-yl)propanoyl (pyrrol idinc-2-carboxylatc hydrochloride C-8. LCMS (ESI) calc’d for C20H25CIFN3O4 [M + H-HC1]+: 390.2, found: 390.2.
Step I: (2 S, 3 S) -methyl 3-(allyloxy)-l-((S)-2-((S)-3-(3-allylphenyl)-2-((tert- butoxycarbonyl)amino)propanamido)-3-(5-fluoro-lH-indol-3-yl)propanoyl)pyrrolidine-2- carboxylate C-9
To a solution of (. S’)-3-( 3 -allyl phenyl )-2-((/e//-butoxycarbonyl (ami no (propanoic acid C-2 (143 mg, 0.470 mmol) in DMF (5 mL) were added (2.S',3.S')-methyl 3-(allyloxy)-l-((S)-2-amino-3-(5-fluoro- 1 //-indol-3-yl)propanoyl (pyrrol idinc-2-carboxylatc hydrochloride C-8(200 mg, 0.47 mmol), HATU (232 mg, 0.61 mmol), and DIEA (0.16 mL, 0.94 mmol) at 0 °C. The mixture was stirred at rt. for 1 h. The reaction solution was diluted with water (20 mL), extracted with EA (20 mL). The organic layer was washed with brine (2 x 10 mL), dried over anhydrous MgSCL and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1 % - 60% EA in PE. The fractions containing desired product were combined and concentrated to afford (25,,3S)-methyl 3-(allyloxy)-l-((S)-2-((5)-3-(3-allylphenyl)-2-((teri- butoxycarbonyl)amino)propanamido)-3-(5-fluoro-lii-indol-3-yl)propanoyl)pyrrolidine-2- carboxylate C-9. LCMS (ESI) calc’d for C37H45FN4O7 [M + H]+: 677.3, found 677.4; ¾ NMR (300 MHz, CDCb): d 8.04 (br, 1H), 7.45-7.35 (m, 1H), 7.28-7.12 (m, 2H), 7.07-6.88 (m, 4H), 6.66 (d, J = 8.4 Hz, 1H), 6.02-5.76 (m, 2H), 5.34-5.15 (m, 2H), 5.12-5.00 (m, 2H), 4.95 (br, 1H), 4.80 (br, 1H), 4.52 (s, 1H), 4.32 (br, 1H), 4.08-3.90 (m, 2H), 3.80-3.70 (m, 3H), 3.55 (br, 1H), 3.35 (t, J = 7.7 Hz, 2H), 3.19 -2.99 (m, 3H), 2.00-1.75 (m, 2H), 1.44-1.32 (m, 9H).
Step J: Methyl (12S,13S,9S,12S,E)-9-((tert-butoxycarbonyl)amino)-12-((5-fluoro-lH-indol-3- yl)methyl)-l 0, 13-dioxo-2-oxa-l 1-aza-l (3,1 )-pyrrolidina-7 (1 , 3)-benzenacyclotridecaphan-4-ene-12- carboxylate C-10
To a stirred solution of (25,35)-methyl 3-(allyloxy)-l-((5)-2-((5)-3-(3-allylphenyl)-2-((feri- butoxycarbonyl)amino)propanamido)-3-(5-fluoro-lY/-indol-3-yl)propanoyl)pyrrolidine-2- carboxylate C-9 (2.00 g, 2.96 mmol) in DCE (200 mL) was added Zhan IB (0.22 g, 0.30 mmol) in 10 min. The mixture was stirred at room temperature for 3 h under nitrogen atmosphere and concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1 % - 60% EA in PE. The fractions containing desired product were combined and concentrated to afford methyl ( \2S, 135, 95)125)-9-((fer/-butoxycarbonyl)amino)- 12-((5-fluoro- lYY-indol-3 -yl)methyl)- 10, 13 -dioxo-2-oxa- 11 -aza- 1(3,1 )-pyrrolidina-7( 1,3)- benzenacyclotridecaphan-4-ene-12-carboxylate C-10. LCMS (ESI) calc’d for C35H41FN4O7 [M + H]+: 649.3, found 649.4; ‘HNMR (400 MHz, CD3OD) d 7.35-7.25 (m, 2H), 7.26-7.16 (m, 2H), 7.07 (d, J = 7.7 Hz, 1H), 6.98 (d, J= 7.6 Hz, 1H), 6.95-6.82 (m, 2H), 5.77-5.68 (m, 1H), 5.45 (d, J = 15.6 Hz, 1H), 4.97-4.87 (m, 3H), 4.71 (s, 1H), 4.41 (t, J= 6.5 Hz, 1H), 4.24 (d, J = 14.8 Hz, 1H), 4.09 (d, J = 3.8 Hz, 1H), 3.95-3.86 (m, 1H), 3.78-3.68 (m, 4H), 3.31-2.95 (m, 5H), 2.00-1.78 (m, 2H), 1.49 (s, 9H).
Step K: Methyl (12S,13S,9S,12S,E)-9-((tert-butoxycarbonyl)amino)-12-((5-fluoro-l-(prop-2-yn-l- yl)-lH-indol-3-yl)methyl)-l 0, 13-dioxo-2-oxa-l 1-aza-l (3, 1 )-pyrrolidina- 7(1, 3)- benzenacyclotridecaphan-4-ene-12-carboxylate C-ll
To a solution of CS2CO3 (171 mg, 0.52 mmol) in DMF (1.5 mL) was added methyl ( 125, 135,95, 125, £)-9-((i<2ri-butoxycarbonyl)amino)- 12-((5-fluoro- 1 //- i n d 01 - 3 -y 1 ) m e th yl ) - 10, 13- dioxo-2-oxa- 11 -aza- 1(3,1 )-pyrrolidina-7( 1 ,3)-benzenacyclotridecaphan-4-ene- 12-carboxylate C-10 (100.0 mg, 0.154 mmol) (including 10% Cis olefin) and 3-bromoprop-l-yne (64.2 mg, 0.540 mmol) at room temperature under nitrogen atmosphere. The mixture was stirred at 40 °C for 16 h. The reaction was cooled to rt. and poured into 10 mL of 50% sat brine / 10% citric acid solution, extracted with EA (2 x 10 mL). The organic layer was washed with brine (2 x 10 mL), dried over anhydrous MgSCE and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1% - 60% EA in PE. The fractions containing desired product were combined and concentrated to afford a mixture of trans/cis product, which was dissolved in EtOH (5 mL) and separated by Prep-SFC (Column: Reg IA Column, 5 x 25 cm, 5 um; Mobile Phase A: CO2, 60%, Mobile Phase B: MeOH, 40%; Flow rate: 160 mL/min; Detector: UV 220 nm). The collected fractions were combined and concentrated under reduced pressure to give methyl ( 125, 135,95,125, E)-9-((ter/-butoxycarbonyl)amino)-12-((5-fluoro-l-
(prop-2-yn- 1 -yl)- lii-indol-3-yl)methyl)- 10,13-dioxo-2-oxa- 11 -aza- 1(3,1 )-pyrrolidina-7( 1 ,3)- benzenacyclotridecaphan-4-ene-12-carboxylate (RTi= 3.8 min) C-ll. LCMS (ESI) calc’d for C38H43FN4O7 [M + H]+: 687.3, found 687.4; ¾ NMR (400 MHz, CD3OD) d 7.43 (dd, J= 8.9, 4.3 Hz, 1H), 7.34 (dd, J = 9.6, 2.5 Hz, 1H), 7.21 (t, J= 7.5 Hz, 1H), 7.07 (d, J=1.7 Hz, 1H), 7.01-6.90 (m, 3H), 5.78-5.68 (m, 1H), 5.44 (d, J = 15.3 Hz, 1H), 4.96 (d, J = 2.5 Hz, 2H), 4.90-4.83 (m, 1H), 4.72 (s, 1H), 4.42 (t, J= 6.3 Hz, 1H), 4.24 (d, J = 15.1 Hz, 1H), 4.09 (d, J = 3.9 Hz, 1H), 3.90 (dd, J = 14.7, 4.9 Hz, 1H), 3.73 (s, 3H), 3.71-3.64 (m, 1H), 3.32-3.25 (m, 2H), 3.18 (dd, J= 14.3, 8.4 Hz,
1H), 3.12-2.98 (m, 4H), 2.81 (t, J= 2.5 Hz, 1H), 1.96-1.78 (m, 2H), 1.50 (s, 9H).
Step L: (12S,13S,9S,12S,E)-9-((tert-butoxycarbonyl)amino)-12-((5-fluoro-l-(prop-2-yn-l-yl)-lH- indol-3-yl)methyl)-10, 13-dioxo-2-oxa-l 1 -aza-1 (3, l)-pyrrolidina- 7(1, 3)-benzenacyclotridecaphan-4- ene-12-car boxy lie acid C
To a solution of methyl ( 12.S, 13. S', 9. S', 12.S',£,)-9-((te/7-butoxycarbonyl)amino)- 1 2-((5-PIIOIΌ- 1 -(prop-2- yn- 1 -yl)- lii-indol-3-yl)methyl)- 10, 13-dioxo-2-oxa- 11 -aza- 1(3,1 )-pyrrolidina-7( 1 ,3)- benzenacyclotridecaphan-4-ene-12-carboxylate C-ll (850 mg, 1.24 mmol) in THF (20 mL) was added 1 M FiOH (2.5 mF) at room temperature. The reaction mixture was stirred at room temperature for 3 h. The reaction was partitioned with pH 4 Phosphate buffer (1M KH2PO4, 30 mF), extracted with EA (50 mF). The organic layer was washed with brine (2 x 50 mF), dried over anhydrous MgSCfi and filtered. The filtrate was concentrated under reduced pressure. The crude was further purified by Flash (Column: Flash C18 120 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 45 mF/min; Gradient: 10% B to 20% B in 10 min, 20% B to 60% B in 25 min; Detector: UV 254 nm; RT= 20 min) to afford ( 1 IS, 135, 95, 125,£’)-9-((fe/7-butoxycarbonyl)amino)- 12-((5- fluoro- 1 -(prop-2-yn- 1 -yl)- lii-indol-3-yl)methyl)- 10, 13-dioxo-2-oxa- 11 -aza- 1 (3, l)-pyrrolidina- 7(l,3)-benzenacyclotridecaphan-4-ene-12-carboxylic acid C. FCMS (ESI) calc’d for C37H41FN4O7 [M + H]+: 673.3, found 673.4; ‘HNMR (400 MHz, CD3OD) d 8.14 (d, J = 7.7 Hz, 1H), 7.42 (dd, J= 8.9, 4.3 Hz, 1H), 7.34 (dd, J = 9.6, 2.5 Hz, 1H), 7.27 (s, 1H), 7.21 (t, J = 7.5 Hz, 1H), 7.07 (d, J= 7.8 Hz, 1H), 7.01-6.90 (m, 3H), 5.78-5.68 (m, 1H), 5.46 (d, J= 15.2 Hz, 1H), 4.98-4.84 (m, 3H), 4.71 (s, 1H), 4.41 (t, J= 63 Hz, 1H), 4.24 (d , J= 14.4 Hz, 1H), 4.15 (d, J= 3.5 Hz, 1H), 3.99-3.90 (m, 1H), 3.73-3.63 (m, 1H), 3.31-3.00 (m, 7H), 2.79 (t, J = 2.5 Hz, 1H), 1.95-1.86 (m, 2H), 1.50 (s, 9H). Preparation of intermediate D
Step A: Preparation of intermediate D-l
To a solution of (S)-l-((S)-2-((25,,3 ?)-3-(teri-butoxy)-2-((teri-butoxycarbonyl)amino)butanamido)-3- (4-methoxyphenyl)propanoyl)-2-methylpyrrolidine-2-carboxylic acid A (2.70 g, 4.79 mmol) in DMF (30 mL) were added HATU (1.82 g, 4.79 mmol), ethyl 7-((4-(2-aminoethyl)-2- (azidomethyl)benzyl)amino)-7-oxoheptanoate B (1.80 g, 4.79 mmol) and DIEA (1.86 g, 14.4 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The mixture was diluted with brine (120 mL), extracted with EA (2 x 120 mL), washed brine (2 x 100 mL), dried over anhydrous MgSCL and filtered, the filtrate was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 1% - 10% MeOH in DCM. The fractions containing
desired product were combined and concentrated to afford intermediate D-l. LCMS (ESI) calc’d for C48H72N8OIO [M + H]+: 921.5, found 921.7.
Step B: Preparation of intermediate D-2
To a solution of intermediate D-l (3.0 g, 3.26 mmol) in 4 N HC1 dioxane solution (30 mL) at 0 °C. The mixture was stirred at RT for 1 h. The resulting mixture was concentrated under reduced pressure to afford intermediate D-2. LCMS (ESI) calc’d for C39H57CIN8O8 [M - HC1 + H]+: 765.4, found 765.5.
Step C: Preparation of intermediate D-3
To a solution of intermediate C (2.00 g, 2.97 mmol) in DMF (20 mL) were added HATU (1.13 g, 2.97 mmol), D-2 (2.38 g, 2.97 mmol) and DIEA (3.12 mL, 17.8 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The mixture was diluted with brine (80 mL), extracted with EA (2 x 80 mL), washed brine (2 x 50 mL), dried over anhydrous MgS04 and filtered, the filtrate was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 1% - 10% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford D-3. LCMS (ESI) calc’d for C76H95FNi20i4 [M + H]+:1419.7, found 1419.5. Step D: Preparation of intermediate D-4
To a solution of D-3 (1.00 g, 0.704 mmol) in i-BuOH (250 mL) were added water (250 mL), CuS04 5H2O (0.088 g, 0.352 mmol) and sodium ascorbate (0.070 g, 0.352 mmol) at RT. The mixture was stirred at 90 °C for 6 h and concentrated under reduced pressure. The residue was diluted with brine (50 mL), extracted with EA (2 x 100 mL), washed brine (50 mL), dried over anhydrous MgS04 and filtered, the filtrate was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 1% - 12% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford D-4. LCMS (ESI) calc’d for C76H95FN12OM [M + H]+: 1419.7, found 1419.5.
Step E: Preparation of intermediate D-5
To a solution of D-4 (730 mg, 0.514 mmol) in THF (15 mL) were added IPA (15 mL) and 0.5 M LiOH (8.23 mL, 4.11 mmol) at RT. The mixture was stirred at RT for 2 h. The mixture was added 1 M HC1 (4.1 mL) at 0 °C. The mixture was concentrated under reduced pressure to afford D-5. LCMS (ESI) calc’d for C74H9iFNi20i [M + H]+: 1391.7, found 1391.6.
Step F: Preparation of intermediate D-6
To a solution of above crude of D-5 in DMF (8 mL) were added HATU (215 mg, 0.566 mmol), ( R )- tert- butyl 3-((((9ii-fluoren-9-yl)methoxy)carbonyl)amino)-2-aminopropanoate hydrochloride (216 mg, 0.515 mmol) and DIEA (0.539 mL, 3.09 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The mixture was diluted with brine (30 mL), extracted with EA (2 x 30 mL), washed brine (2 x 30
mL), dried over anhydrous MgSCL and filtered, the filtrate was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 1 % - 12% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford D-6. LCMS (ESI) calc’d for C96H115FN14O17 [(M - HCl)/2 + H]+: 878.4, found 879.0.
Step G: Preparation of intermediate D-7
To a solution of D-6 (800 mg, 0.456 mmol) in DCM (16 mL) was added TFA (16 mL) at -10 °C. The mixture was stirred at RT for 2 h. The resulting mixture was concentrated under reduced pressure. The residue was purified by Flash (Column: Flash C18 330 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 100 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 50% B in 20 min; Detector: UV 220 nm; Rt = 19 min) and concentrated under reduced pressure. The residue was re-dissolved in DCM (50 mL) and toluene (50 mL). The mixture was then concentrated under reduced pressure and the residue was re-dissolve in DCM (3 mL) and HC1 (4 M in dioxane, 0.2 mL). The resulting mixture was concentrated under reduced pressure and the residue was re-dissolve in ACN (60 mL) and water (60 mL), and then added 1 M HC1 (0.5 mL) at 0 °C and lyophilized to afford D-7. LCMS (ESI) calc’d for CSTHIOOCIFNUOIS [(M - HCl)/2 + H]+: 800.4, found 800.8.
Step H: Preparation of intermediate D-8
To a solution of D-7 (600 mg, 0.367 mmol) in DMF (60 mL) were added DIEA (237 mg, 1.83 mmol), DCM (750 mL) and HATU (167 mg, 0.440 mmol) at RT. The mixture was stirred at RT for 1 h. The mixture was concentrated under reduced pressure to remove DCM, and then diluted with brine (240 mL), extracted with EA (2 x 240 mL), washed brine (2 x 200 mL), dried over anhydrous MgSCL and filtered, the filtrate was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 1% - 12% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford D-8. LCMS (ESI) calc’d for C87H97FNi4Oi4 [M + H : 1581.7, found 1582.7.
Step I: Preparation of intermediate D
To a solution of D-8 (450 mg, 0.284 mmol) in THF (10 mL) were added MeOH (3 mL), Water (3 mL) and 1 M LiOH (1.14 mL, 1.14 mmol) at 0 °C. The mixture was stirred at RT for 1 h. The resulting mixture was concentrated under reduced pressure. The residue was directly purified by Flash (Column: Flash C18 330 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 100 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV220 nm; Rt=
15 min) and concentrated under reduced pressure. The residue was re-dissolved in ACN (30 mL) and water (30 mL), and then added 1 M HC1 (0.4 mL) at 0 °C and lyophilized to afford D. LCMS (ESI) calc’d for C72¾8ClFNi40i2 [M - HC1 + H]+: 1359.7, found 1359.6.
Step A - Synthesis of intermediate E-l
To a suspension of (2S,3S)-3-hydroxypyrrolidine-2-carboxylic acid (5.32 g, 40.6 mmol) in dioxane (100 ml) at 0°C was added IN NaOH (122 ml, 122 mmol), followed by addition of benzyl chloroformate (6.50 ml, 44.6 mmol) dropwise then the resulting suspension was stirred at 0 °C for 5 h. The solution was concentrated, the aqueous layer was acidified to pH 3, partitioned between 30% IPA in DCM (200 mL) and brine (50 mL), and the aqueous phase was further extracted with 30% IPA in DCM (2xl00mL). The combined organic layers were dried over Na2SOt, filtered and the filtrate was concentrated to give E-l . LC/MS: [M+H]+ = 266.1. Step B - Synthesis of intermediate E-2
To a solution of E-l (7.48 g, 28.2 mmol) in MeOH (80 ml) was added TMS-diazomethane (70.5 ml, 141 mmol) dropwise, and the resulting solution was stirred at RT for 10 min, then quenched by addition of acetic acid (ca. 400 uL) dropwise. The solution was concentrated, and the residue was purified by MPLC over silica gel (eluting with a gradient of EtOAc in hexanes) to give E-2. LC/MS: [M+H]+ = 280.1.
Step C - Synthesis of intermediate E-3
A solution of E-2 (4.81 g, 17.22 mmol) in DCM (200 mL) was bubbled with nitrogen for 30 min, followed by addition of rhodium(ii) acetate dimer (0.761 g, 1.722 mmol). The mixture was cooled in an ice-water bath, and tert -butyl diazoacetate (3.58 mL, 25.8 mmol) was added at 0 °C dropwise. The resulting mixture was stirred at 0 °C for 1.5 h. The final reaction was quenched by addition of water (100 mL), the mixture was extracted with DCM (3x100 mL), and the combined organic layers was dried over Na2SC>4 and filtered. The filtrate was concentrated and the residue was purified by reverse phase MPLC over C18 (eluting with a gradient of acetonitrile (+0.05%TLA) in water
(+0.05%TFA)). The fraction containing the product was concentrated and the resulting aqueous phase was extracted with DCM (2 l00mL). The combined organic phase was dried over Na2SOt, filtered and concentrated to give E-3. LC/MS: [M+H]+ = 394.2.
Step D - Synthesis of intermediate E-4
To a solution of E-3 (3.72 g, 9.46 mmol) in MeOH (80 ml) was added 10% Pd/C (0.805 g, 0.756 mmol) and the resulting mixture was hydrogenated using a balloon filled with hydrogen at RT for 2 h. The final mixture was filtered over Celite and the filtrate was concentrated to give E-4. LC/MS: [M+H]+ = 259.9.
Step E - Synthesis of intermediate E-5
To a solution of (S)-2-((((9H-fhioren-9-yl)methoxy)carbonyl)amino)-3-(5-fluoro-lH-indol-3- yl)propanoic acid (3 g, 6.75 mmol) in THF (20 ml), MeOFI (10 mL), and water (20.00 ml) at 0 °C was added IN NaOFl (20.25 ml, 20.25 mmol), and the resulting solution was stirred at RT for 4 h then concentrated. To the aqueous mixture was added dioxane (50 ml) and water (20 mL), the resulting solution was cooled to 0 °C and B0C2O (1.881 ml, 8.10 mmol) was added. The resulting solution was stirred at 0 °C for 3 h, then concentrated and the aqueous phase was extracted with Et20 (3x40 mL), acidified to pFl 3, then extracted with DCM (3xl00mL), followed by extraction with 30% IPA in DCM (2x80 mL). The combined organic layers were dried over Na2SOt, filtered and concentrated to give E-5. LC/MS: [M+F1]+ = 322.9.
Step F - Synthesis of intermediate E-6
To a solution of E-5 (2.079 g, 6.45 mmol) in DMF (40 ml) at 0 °C was added 60% NaFl in hexane (0.568 g, 14.19 mmol), and the resulting solution was stirred at 0 °C for 50 min followed by addition of allyl bromide (1.172 mL, 13.54 mmol) dropwise. The resulting solution was stirred at 0 °C for 1.5 h, then quenched by addition of IN F1C1 (ca. 3.68 mL). The solution was then partitioned between EtOAc (200 mL) and water (100 mL), the organic phase was washed with brine (2x100 mL), dried over Na2SC>4, filtered and concentrated and the residue was purified by MPLC over silica gel (eluting with a gradient of MeOFI in DCM) to give E-6. LC/MS: [M+F1]+ = 363.0.
Step G - Synthesis of intermediate E-7
To a solution of E-6 (2.239 g, 6.18 mmol) and E-4 (1.842 g, 7.11 mmol) in DMF (30 ml) were added F1ATU (2.82 g, 7.41 mmol) and DIEA (2.59 ml, 14.83 mmol) and the resulting solution was stirred at RT for 1 h. The mixture was partitioned between EtOAc (200 mL) and brine (100 mL), the organic phase was washed with brine (3x100 mL), dried over Na2SO t, filtered and concentrated and the residue was purified by MPLC over silica gel (eluting with a gradient of EtOAc in hexanes) to give E-7. LC/MS: [M+H]+ = 604.2.
Step H - Synthesis of intermediate E-8
To a solution of E-7 (2.83 g, 4.69 mmol) in DCM (20 ml) and tBuOAc (30 ml) at 0 °C was added methanesulfonic acid (1.218 ml, 18.75 mmol) and the resulting solution was stirred at 0 °C for 16.5 h, then at RT for 2.5 h. The solution containing the product E-8 was used in the next step without further purification. LC/MS: [M+H]+ = 504.2.
Step I - Synthesis of intermediate E-9
To a solution of (S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(3-(((tert- butoxycarbonyl)amino)methyl)phenyl)propanoic acid (2.66 g, 5.16 mmol) in DMF (10 ml) was added HATU (1.961 g, 5.16 mmol) and DIEA (5.32 ml, 30.5 mmol), and the resulting solution was stirred at RT for 30 min, then added to an ice-cold bath of the above prepared solution containing E- 8. The resulting solution was stirred at RT for 1 h then concentrated under reduced pressure. The residue was purified by reverse phase MPLC over C 18 (eluting with a gradient of acetonitrile (+0.05%TFA) in water (+0.05%TFA)) to provide E-9. LC/MS: [M+H]+ = 1002.1.
Step J — Synthesis of intermediate E-10
To a solution of E-9 (3.235 g, 3.23 mmol) in DCM (4 ml) was added TFA (7.46 ml, 97 mmol), and the resulting solution was stirred at RT for 1 h, then concentrated. The residue was dissolved in DCM (10 mL), treated with 4 N F1C1 in dioxane (3.23 ml, 12.91 mmol), and concentrated. The residue was dissolved in acetonitrile (100 mL) and water (50 mL) and lyophilized to provide E-10. LC/MS: [M+H]+ = 846.1.
Step K - Synthesis of intermediate E-ll
To a solution of E-10 (2.85 g, 3.23 mmol) in DMF (45 ml) was added FIATU (1.474 g, 3.88 mmol), and the resulting solution was stirred at RT for 30 min, then diluted with DCM (600 ml) followed by addition of DIEA (1.692 ml, 9.69 mmol) dropwise. The resulting solution was stirred at ambient temperature for 1 h. The final solution was concentrated, and the residue was purified by reverse phase MPLC over Cl 8 (eluting with a gradient of acetonitrile (+0.05%TFA) in water (+0.05%TFA). The fractions containing the product were concentrated and the aqueous layer was partitioned between DCM (200 mL) and saturated NaHCCL (200 mL). The aqueous phase was further extracted with DCM (2x100 mL) and the combined organic layers were dried over Na2SOt, filtered and concentrated to give E-ll. LC/MS: [M+H]+ = 828.1.
Step L - Synthesis of intermediate E
To a solution of E-ll (1.93 g, 2.331 mmol) in THF (60 ml), MeOH (30 ml), and water (20 ml) at 0°C was added IN aqueous LiOH (9.9 ml, 9.90 mmol) dropwise, and the resulting solution was stirred at 0 °C for 16 h then quenched by addition of IN HC1 (9.9 mL). The mixture was concentrated under reduced pressure and to the resulting solution at 0 °C were added acetone (60 ml), sodium carbonate (0.371 g, 3.50 mmol), and Fmoc-Osu (0.802 g, 2.378 mmol). The resulting
solution was stirred at 0 °C for 6 h, concentrated under reduced pressure, then the aqueous phase was acidified to pH 4 and extracted with 30% IPA in DCM (3 100 mL). The combined organic layers were dried over Na2SC>4, filtered and concentrated and the residue was purified by MPLC over silica gel (eluting with a gradient of MeOH in DCM) to give intermediate E. LC/MS: [M+H]+ = 814.2.
Step A: (S)-2-benzyl 1-tert-butyl 2-methylpyrrolidine-l ,2-dicarboxylate F-1 To a solution of (S)- 1 -(ter/-butoxycarbonyl)-2-methylpyrrolidine-2-carboxylic acid (5.00 g, 21.8 mmol) in DMF (50 mL) were added NaHCCL (7.33 g, 87 mmol) and BnBr (7.77 mL, 65.4 mmol) at 0 °C. The mixture was stirred at room temperature for 16 h. The reaction solution was quenched with water (80 mL), extracted with EA (3 x 100 mL) and the combined organic layer was washed with brine (3 x 300 mL), dried over anhydrous Na2S04 and filtered. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography, eluted with 0 - 45% EA in PE to afford (.S)-2-bcnzyl 1 -te/7-butyl 2-methylpyrrolidine- 1 ,2-dicarboxylate F-1. LCMS (ESI) calc’d for Ci8H25N04 [M + H]+: 320.2, found 320.2. ¾ NMR (300 MHz, CDCI3) d 7.36-7.31 (m, 5H), 5.25-5.01 (m, 2H), 3.67-3.41 (m, 2H), 2.23-2.10 (m, 1H), 1.97-1.79 (m, 3H), 1.57 (d , / = 17.9 Hz, 3H), 1.44-1.33 (m, 9H).
Step B: (S)-benzyl 2-methylpyrrolidine-2-carboxylate hydrochloride F-2
To a solution of (.S')-2-bcnzyl 1 -fe/7-butyl 2-methylpyrrolidine- 1 ,2-dicarboxylate F-l(6.10 g, 19.1 mmol) in THF (10 mL) was added 4 M HC1 in dioxane (50 mL) at room temperature. The reaction solution was stirred at room temperature for 2 h. The resulting solution was concentrated under reduced pressure to afford (S)-bcnzyl 2-methylpyrrolidine-2-carboxylate hydrochloride F-2. LCMS (ESI) calc’d for Ci3Hi8ClN0 [M - HC1 + H]+: 220.1, found 220.1.
Step C: Preparation of intermediate F-3
To a stirred solution of (S)-2-((ter/-butoxycarbonyl)amino)-3-(4-methoxyphenyl)propanoic acid F-2 (5.77 g, 19.6 mmol) in DMF (50 mL) were added HATU (7.43 g, 19.6 mmol), (S)-benzyl 2- methylpyrrolidine-2-carboxylate hydrochloride (5.00 g, 19.6 mmol) and DIEA (12.9 mL, 78 mmol) at -40 °C. The resulting mixture was stirred at -40 °C for 4 h. The reaction mixture was quenched by the addition of water (200 mL). The reaction solution was extracted with EA (2 x 200 mL) and the combined organic layer was washed with brine (3 x 400 mL), dried over anhydrous Na SCL and filtered. The residue was purified by silica gel column chromatography eluted with gradient 0% - 60% EA in PE to afford F-3. LCMS (ESI) calc’d for C28H36N2O6 [M + H]+: 497.3, found 497.2; ¾ NMR (400 MHz, CDCI3) d 7.39-7.28 (m, 5H), 7.08 (d, J= 8.3 Hz, 2H), 6.74 (d, J= 8.5 Hz, 2H), 5.26-5.10 (m, 2H), 4.53-4.47 (m, 1H), 3.75 (s, 3H), 3.71-3.63 (m, 1H), 3.22-3.16 (m, 1H), 2.89-2.84 (m, 1H), 2.65-2.60 (m, 1H), 2.14-2.05 (m, 1H), 1.58 (s, 6H), 1.36 (s, 9H).
Step D: Preparation of intermediate F-4
To a solution of F-3 (6.70 g, 13.49 mmol) in THF (10 mL) was added 4 M HC1 in 1,4-dioxane (60 mL). The reaction solution was stirred at room temperature for 2 h. The resulting solution was concentrated under reduced pressure to afford F-4. LCMS (ESI) calc’d for C23H29CIN2O4 [M - HC1 + H]+: 397.2, found 397.1.
Step E: Preparation of intermediate F-5
To a solution of (2.S',3/Z)-2-((fe/7-butoxycarbonyl)amino)-3-(prop-2-yn- 1 -yloxy (butanoic acid (prepared by the process described in Henseler; Advanced Synthesis & Catalysis, 2014, 356(5), 1795-1802) (1.19 g, 4.62 mmol) in DMF (20 mL) were added HATU (1.76 g, 4.62 mmol), F-4 (2.00 g, 4.62 mmol) and DIEA (3.23 mL, 18.5 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The mixture was diluted with brine (80 mL), extracted with EA (2 x 80 mL), washed brine (2 x 30 mL), dried over anhydrous MgSCL and filtered, the filtrate was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 1% - 50% EA in PE. The fractions containing desired product were combined and concentrated to afford F-5. LCMS (ESI) calc’d for C35H45N3O8 [(M + H)]+: 636.3, found 636.4; ¾ NMR (300 MHz, CDCI3) d 7.43-7.32 (m, 5H), 7.11 (d, J = 8.2 Hz, 2H), 6.74 (d, J = 8.3 Hz, 2H), 5.32-5.07 (m, 2H), 4.88-4.76 (m, 1H), 4.19-
4.06 (m, 4H), 3.75 (s, 3H), 3.67 (br, 1H), 3.15 (br, 1H), 3.02-2.89 (m, 2H), 2.87-2.72 (m, 1H), 2.43 (t, J= 2.5 Hz, 1H), 2.10 (br, 1H), 1.97-1.82(m, 4H), 1.58 (d , J = 9.0 Hz, 3H), 1.45 (s, 9H), 1.16 (d, J = 6.3 Hz, 3H).
Step F: Preparation of intermediate F-6
To a solution of F-5 (2.00 g, 3.15 mmol) and benzyl (2-azidoethyl)carbamate (830 mg, 3.78 mmol) in i-BuOH (250 mL) were added water (250 mL), CUSO45H2O (390 mg, 1.57 mmol) and sodium ascorbate (0.312 g, 1.573 mmol) at room temperature. The mixture was stirred at 50 °C for 30 min and concentrated under reduced pressure. The residue was diluted with brine (50 mL), extracted with EA (2 x 100 mL), washed brine (50 mL), dried over anhydrous MgSCL and filtered, the filtrate was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 1 % - 10% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford F-6. LCMS (ESI) calc’d for C45H57N7O10 [M + H]+: 856.4, found 856.5.
Step G: Preparation of intermediate F-7
To a solution of F-6 (2.00 g, 2.34 mmol) in THF (100 mL) was added Pd/C (200 mg, 0.188 mmol, dry, 10% wt) at room temperature under nitrogen atmosphere. The mixture was degassed with hydrogen three times and stirred at room temperature for 16 h. The resulting mixture was filtered and the filtrate was concentrated under reduced pressure to afford F-7. LCMS (ESI) calc’d for C3OH45N708 [M + H]+: 632.3, found 632.4.
Step H: Preparation of intermediate F
To a solution of F-7(1.00 g, 1.58 mmol) in THF (10 mL) and water (10 mL) were added NaHC(¾ (0.399 g, 4.75 mmol) and Cbz-OSu (0.473 g, 1.90 mmol) at 0 °C. The reaction mixture was stirred for 16 h at room temperature. The pH value of the resulting solution was adjusted to 2 with 1 M HC1 at 0 °C. The mixture was extracted with EA (2 x 50 mL), dried over anhydrous Na2S04 and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1 % - 10% MeOH in DCM. The fractions containing the desired product were combined and concentrated under reduced pressure to afford F. LCMS (ESI) calc’d for C38H51N7O10 [M + H]+: 766.4, found 766.4; ¾ NMR (300 MHz, CD3OD) d 7.91-7.85 (m, 1H), 7.36-7.31 (m, 5H), 7.23-7.14 (m, 2H), 6.83-6.74 (m, 2H), 5.10-5.04 (m, 2H), 4.85-4.75 (m, 1H), 4.67-4.56 (m, 1H), 4.56-4.44 (m, 3H), 4.13-3.94 (m, 2H), 3.71 (s, 3H), 3.66-3.57 (m, 2H), 3.40- 2.96 (m, 2H), 2.82-2.64 (m, 2H), 2.25-1.75 (m, 4H), 1.51-1.36 (m, 12H), 1.13 (d, J= 6.2 Hz, 3H). Preparation of Intermediate G
Step A - Synthesis of intermediate G-l
A solution of 4-bromobenzaldehyde (15.00 g, 81 mmol), potassium tert-butyl N-[2- (trifluoroboranuidyl)ethyl]carbamate (20.97 g, 84 mmol), cesium carbonate (52.8 g, 162 mmol) and 1 , r-bis(diphenylphosphino)ferrocene-palladium(II)dichloride dichloromethane complex (1.99 g,
2.43 mmol) in degassed toluene (250 ml) and water (85 ml) was warmed to 76 °C and stirred overnight. The mixture was quenched at RT with half- saturated aqueous NH4CI and extracted with EtOAc. The combined organic fractions were washed with brine, dried over Na2S04, filtered and the filtrate was concentrated in vacuo. The residue was purified by MPLC over silica gel (eluting with a gradient of EtOAc in DCM) to give G-l. LC/MS: [M-56]+ = 193.0.
Step B - Synthesis of intermediate G-2
To a solution of G-l (12.9 g, 51.7 mmol) and pent-4-en-l -amine (6.61 g, 78 mmol) in DCM (120 ml) and AcOH (3 ml) at RT in a water bath was added sodium triacetoxy borohydride (32.9 g, 155 mmol) portion wise and the mixture was stirred for 30 min. The reaction was slowly quenched at 0 °C with water (3 ml), poured into 1 N NaOH (500 ml), stirred for 15 min then extracted with DCM, dried over Na2S04, and concentrated. The residue was purified by MPLC over silica gel (eluting with a gradient of MeOH in DCM) to give G-2. LC/MS: [M+H]+ = 319.2.
Step C - Synthesis of intermediate G-3
To a solution of G-2 (8.48 g, 20.77 mmol) and 4-methoxy-4-oxobutanoic acid (3.02 g, 22.85 mmol) in DMF (40 ml) were added HATU (9.48 g, 24.92 mmol) and DIPEA (8.71 ml, 49.8 mmol). The resulting solution was stirred at RT for 1 h, then quenched with aqueous saturated NaHC03 (10 mL). The mixture was partitioned between EtOAc (500 mL) and aqueous saturated NaHC03 (200 mL), the organic phase was washed with brine (3x200 mL), dried over Na2S04, concentrated and the residue was purified by MPLC over silica gel (eluting with a gradient of EtOAc in hexanes) to give G-3. LC/MS: [M+H]+ = 433.4.
Step D - Synthesis of intermediate G
To a solution of G-3 (2.9 g, 6.70 mmol) in DCM (15 mL) at RT was added 4 M HC1 in dioxane (10 mL) and the reaction mixture was stirred at RT for 1 h. The mixture was concentrated under reduced pressure to give intermediate G. LC/MS: [M+H]+ = 333.3. Preparation of intermediate H
Step A - Synthesis of intermediate H-l
To a solution of D-Dap(Boc)-OMe HC1 salt (4.10 g, 16.10 mmol), Fmoc-Ala-OH (5.01 g, 16.10 mmol) and HATU (6.43 g, 16.90 mmol) in DMF (40 ml) at 0 °C was added DIPEA (7.03 ml, 40.2 mmol) and the mixture was stirred at 0 °C for 2 h then kept in the refrigerator overnight. The mixture was quenched at RT with water and extracted with EtOAc. The combined organic fractions were washed with half brine, dried over Na2S04, filtered and the filtrate was concentrated in vacuo. The residue was purified by MPLC over silica gel (eluting with a gradient of EtOAc in hexanes) to give H-l. LC/MS: [M+H]+= 512.3. Step B - Synthesis of intermediate H
To a solution of H-l (8.03 g, 15.70 mmol) and 0.8 N calcium chloride (19.62 ml, 15.70 mmol) in water (40 ml) and 2-propanol (120 ml) at RT was added solid sodium hydroxide (0.691 g, 17.27 mmol). The mixture was stirred at room temperature overnight. The final mixture was concentrated, acidified with 0.5 N to pH ~2 (~40 mL), extracted three times with EtOAc, washed with brine, dried over Na2S04 and concentrated. The residue was purified by reverse phase MPLC over C 18 (eluting with a gradient of acetonitrile in water (+ 0.1% TFA)) to give intermediate H. LC/MS: [M+H]+ = 498.2.
Step A: Preparation of intermediate 1-1
To the solution F (860 mg, 1.12 mmol) in DMF (10 mL) were added HATU (470 mg, 1.23 mmol), G (414 mg, 1.12 mmol) and DIEA (0.784 mL, 4.49 mmol) under nitrogen atmosphere at -20 °C. The mixture was stirred at -20 °C for 1 h. The reaction solution was quenched with water (50 mL), extracted with EA (2 x 50 mL). The organic layer was washed with brine (3 x 100 mL), dried over
anhydrous Na2SC>4 and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1% - 10% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford 1-1. LCMS (ESI) calc’d for C57H77N9O12 [M + H]+: 1080.6, found 1080.6; 'HNMR (400 MHz, CD3OD) d 7.86-7.82 (m, 1H), 7.38-7.12 (m, 11H), 6.84-6.78 (m, 2H), 5.83-5.71 (m, 1H), 5.08-5.04(m, 2H), 5.03-4.78 (m, 4H), 4.63-4.55 (m, 3H), 4.52-4.42 (m, 3H), 3.99-3.94 (m, 1H), 3.72-3.63 (m, 6H), 3.64-3.56 (m,
2H), 3.52-3.25 (m, 8H), 2.84-2.56 (m, 8H), 2.10-1.96 (m, 3H), 1.91-1.55 (m, 6H), 1.44 (s, 9H), 1.12 (d, J 6.2 Hz, 3H).
Step B: Preparation of intermediate 1-2
To a stirred solution of 1-1 (900 mg, 0.833 mmol) in DCM (2.7 mL) was added 4 N HC1 in 1,4- dioxane (4.9 mL, 19.6 mmol) at -20 °C. The reaction mixture was stirred at 0 °C for 0.5 h and concentrated under reduced pressure. The residue was re-dissolved in DCM and concentrated under reduced pressure to afford 1-3. LCMS (ESI) calc’d for C52H70CIN9O10 [M - HC1 + H]+: 980.5, found 980.6.
Step C: Preparation of intermediate 1-3
To a solution of E (572 mg, 0.826 mmol) in DME (9 mL) were added HATU (346 mg, 0.909 mmol), 1-2 (840 mg, 0.826 mmol) and DIEA (0.577 mL, 3.31 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The reaction solution was quenched with water (50 mL) and extracted with EA (3 x 50 mL). The organic layer was washed with brine (3 x 100 mL), dried over anhydrous MgSCL and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1 % - 10% MeOH in DCM. The fractions containing desired product were combined and concentrated under reduced pressure to afford 1-3. LCMS (ESI) calc’d for C88Hio9LNi4Oi7 [M + H]+: 1653.8, found 1653.8.
Step D: Preparation of intermediate 1-4
To a stirred solution of 1-3 (960 mg, 0.580 mmol) in DCE (580 mL) was added Zhan-IB (85.0 mg,
0.116 mmol) at room temperature. The reaction solution was stirred at 50 °C for 16 h. The mixture was cooled to rt, concentrated under reduced pressure and the residue was purified by silica gel column chromatography, eluted with gradient 1 % - 10% MeOH in DCM. The fractions containing desired product were combined and concentrated under reduced pressure to afford 1-4. LCMS (ESI) calc’d for C86H105FN14O17 [M + Na]+: 1647.8, found 1647.6.
Step E: Preparation of intermediate 1-5
To the solution of 1-4 (900 mg, 0.554 mmol) in DCM (10 mL) was added TLA (2 mL, 26.0 mmol) at room temperature. The mixture was stirred at room temperature for 1 h. The resulting mixture was concentrated under reduced pressure and the residue was re-dissolved in DCM (5 mL) and toluene (5
mL). The mixture was concentrated under reduced pressure and the residue was re-dissolve in ACN (10 mL) and water (10 mL) and lyophilized to afford 1-5. LCMS (ESI) calc’d for C83H98F4N14O17 [M - TFA + H]+: 1525.7, found 1527.0.
Step F: Preparation of intermediate 1-6
To a solution of G (313 mg, 0.629 mmol) in DMF (8 mF) were added HATU (259 mg, 0.682 mmol), 1-5 (800 mg, 0.524 mmol) and DIEA (0.366 mF, 2.10 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The reaction solution was quenched with water (50 mF) and extracted with EA (2 x 50 mF). The organic layer was washed with brine (3 x 100 mF), dried over anhydrous MgSCL and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1 % - 10% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford 1-6 FCMS (ESI) calc’d for C107H126FN17O21 [(M + 2H)/2]+: 1003.0, found 1003.5.
Step G: Preparation of intermediate 1-7
To a solution of 1-6 (790 mg, 0.394 mmol) in THF (7.8 mF) were added MeOH (2.3 mF), water (2.3 mF) and 1 M FiOH (3.94 mF, 3.94 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The resulting mixture was concentrated under reduced pressure. The residue was purified by Flash (Column: Flash C18 330 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate:
100 mF/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 254/210 nm; Rt = 23 min). The fractions containing desired product were concentrated under reduced pressure. The residue was re-dissolved in ACN (10 mF) and water (10 mF), added 1 M HC1 (0.5 mF) at 0 °C, and lyophilized to afford 1-7. FCMS (ESI) calc’d for C91H115CIFN17O19 [(M - HC1 + 2H)/2]+: 884.9, found 885.5.
Step H: Preparation of intermediate 1-8
To the solution of 1-7 (480 mg, 0.266 mmol) in DMF (48 mF) were added DIEA (0.232 mF, 1.33 mmol), DCM (600 mF) and HATU (121 mg, 0.319 mmol) at room temperature. The mixture was stirred at room temperature for 1 h. The reaction solution was concentrated under reduced pressure to remove DCM and diluted with brine (200 mF), extracted with EA (2 x 200 mF). The organic layer was washed with brine (3 x 400 mF), dried over anhydrous MgSCL and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1% - 10% MeOH in DCM. The fractions containing desired product were combined and concentrated under reduced pressure to afford 1-8. FCMS (ESI) calc’d for C9iHii2FNi70i8 [(M + 2H)/2]+:875.9, found 876.3.
Step I: Preparation of intermediate 1-9
To a stirred solution of 1-8 (25.0 mg, 0.014 mmol) in MeOH (3 mL) was added Pd/C (5 mg, 4.70 m mol, dry, 10% wt) at room temperature. The mixture was degassed with hydrogen for 3 times and stirred at room temperature under hydrogen atmosphere for 2 h. The reaction solution was filtered and the filtrate was concentrated under reduced pressure. The residue was re-dissolved in ACN (5 mL) and water (5 mL), added 1 M HC1 (28 pL) and lyophilized to afford 1-9. LCMS (ESI) calc’d for C83H109CIFN17O16 [M - HC1 + H]+: 1618.8, found 1619.8.
Step J: Preparation of interediate 1-10
To a solution of 1-9 (140 mg, 0.080 mmol) in DCM (5 mL) was added TFA (1 mF, 13.0 mmol) at 0 °C. The reaction mixture was stirred at room temperature for 1 h. The resulting solution was concentrated under reduced pressure and the residue was re-dissolved in DCM (5 mF) and toluene (5 mF). The mixture was concentrated under reduced pressure, re-dissolved in ACN (5 mF) and water (5 mF), and lyophilized to afford 1-10. FCMS (ESI) calc’d for CM 110 F4N 17O i s [(M - TFA +
2H)/2]+: 825.9, found 826.5.
Step K: Preparation of intermediate 1-11
To a solution of 1-10 (140 mg, 0.083 mmol) in DMF (2 mF) and water (200 pF) were added 2-(2-(2- carboxycthoxy)cthoxy)-/V,/V,/V-tiiincthylcthanaminiu m chloride (42.4 mg, 0.166 mmol), HATU (63.1 mg, 0.166 mmol) and DIEA (0.116 mF, 0.664 mmol) at -20 °C. The mixture was stirred at 0 °C for 1 h. The reaction solution was quenched with water (100 pF) and purified Flash (Column: Flash C18 80 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 65 mF/min; Gradient: 2%
B to 2% B in 5 min, 40% B to 80% B in 20 min; Detector: UV 254/210 nm; Rt = 20 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (10 mF) and water (10 mF), lyophilized to afford 1-11. FCMS (ESI) calc’d for C^H^NisCLi [(M - TFA + H)/2]+:927.5, found 927.1.
Step L: Preparation of intermediate I
To a stirred solution of 1-10 (70.0 mg, 0.036 mmol) in MeOH (5 mF) was added Pd/C (10 mg, 9.40 pmol, dry, 10% wt) at room temperature. The reaction mixture was degassed with hydrogen for three times and stirred at room temperature under hydrogen atmosphere for 2 h. The resulting mixture was filtered and the filtrate was concentrated under reduced pressure. The residue was purified by Flash (Column: Flash C18 80 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 65 mF/min; Gradient: 2% B to 2% B in 5 min, 20% B to 50% B in 15 min; Detector: UV 254/210 nm; Rt = 13 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (10 mF) and water (10 mF), and lyophilized to afford Intermediate I. FCMS (ESI) calc’d for C92H121F7N18O21 [M - 2TFA + H]+: 1719.9, found 1720.9.
Preparation of intermediate J
Step A: Preparation of intermediate J-l
To a solution of 1-9 (30.0 mg, 0.018 mmol) in DMF (300 gL) and water (30 gL) were added 2-(2-(2- carboxycthoxy)cthoxy)-/V,/V,/V-trimcthylcthanaminiu m chloride (9.27 mg, 0.036 mmol), HATU (13.8 mg, 0.036 mmol) and DIEA (25.3 gL, 0.145 mmol) at -20 °C. The mixture was stirred at 0 °C for 1 h. The reaction solution was quenched with water (100 gL) and purified Flash (Column: Flash C1840 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2%
B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 254/210 nm; Rl — 18 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (5 mL) and water (5 mL), lyophilized to afford J-l. LCMS (ESI) calc’d for C95Hi28F4Ni802i [(M - TFA + H)/2]+: 910.5, found 910.8.
Step B: Preparation of intermediate J
To a solution of J-l (23.0 mg, 0.012 mmol) in DCM (5 mL) was added TFA (1 mL, 13.0 mmol) at - 20 °C. The reaction mixture was stirred at room temperature for 2 h. The resulting solution was concentrated under reduced pressure and the residue was purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 210 nm; Rl — 15 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was
re-dissolved in ACN (5 mL) and water (5 mL), and lyophilized to afford Intermediate J. LCMS (ESI) calc’d for C92H121F7N18O21 [M - TFA - TFA]+: 1719.9, found 1720.8.
To a stirred solution of 3,3'-oxydipropanoic acid (5 g, 30.8 mmol) in EA (50 mL) was added DCC (7.00 g, 33.9 mmol) at 0 °C under nitrogen atmosphere. The reaction solution was stirred at room temperature for 16 h. The reaction mixture was filtered and the filtrate was concentrated under reduced pressure to afford l,5-dioxocane-2,8-dione K-1. Step B: 3-(3-methoxy-3-oxopropoxy)propanoic acid K-2
To a solution of l,5-dioxocane-2,8-dione K-l(5.0 g, 34.7 mmol) in MeOH (50 mL) was added CH30Na (0.037 g, 0.694 mmol) at room temperature. The mixture was stirred at 65 °C for 2 h. The resulting mixture was concentrated under reduced pressure and the residue was purified by silica gel column chromatography, eluted with 0 - 7% MeOH in DCM to afford 3-(3-methoxy-3- oxopropoxy)propanoic acid K-2. LCMS (ESI) calc’d for C7H12O5 [M + H]+: 177.1, found 177.0; 111 NMR (300 MHz, CD3OD) d 3.78-3.65 (m, 7H), 2.66-2.48 (m, 4H).
Step C: Methyl 3-(3-((4-(2-((tert-butoxycarbonyl)amino)ethyl)benzyl)(pent-4-en-l-yl) amino)-3- oxopropoxy)propanoate K-3
To a solution of 3-(3-methoxy-3-oxopropoxy)propanoic acid K-2 (1.25 g, 7.07 mmol) in DMF (20 mL) were added HATU (2.96 g, 7.77 mmol), fe/7-butyl 4-((pent-4-en-l- ylamino)methyl)phenethylcarbamate G-2 (2.25 g, 7.07 mmol) and DIEA (4.94 mL, 28.3 mmol) at 0
°C. The mixture was stirred at 0 °C for 1 h. The resulting mixture was diluted with brine (80 mL), extracted with EA (2 x 80 mL), washed brine (2 x 30 mL), dried over anhydrous MgS04 and filtered,
the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1% - 50% EA in PE. The fractions containing desired product were combined and concentrated to afford methyl 3-(3-((4-(2-((feri- butoxycarbonyl)amino)ethyl)benzyl)(pent-4-en- l-yl)amino)-3-oxopropoxy)propanoate K-3. LCMS (ESI) calc ’d for C26H40N2O6 [M + NaJ : 499.6, found 499.30. 'l l NMR (300 MHz, CDCI3) d 7.23- 7.04 (m, 4H), 5.87-5.63 (m, 1H), 5.09-4.88 (m, 2H), 4.55 (d, J = 15.9 Hz, 3H), 3.88-3.65 (m, 6H), 3.36 (td, J = 9.5, 8.3, 4.6 Hz, 3H), 3.27-3.17 (m, 1H), 2.78 (q, J = 6.6 Hz, 2H), 2.72-2.49 (m, 4H), 2.03 (h, J = 6.4 Hz, 2H), 1.64 (td, J = 7.6, 3.2 Hz, 2H), 1.44 (s, 9H).
Step D: Methyl 3-(3-((4-(2-aminoethyl)benzyl)(pent-4-en-l-yl)amino)-3-oxopropoxy)propanoate hydrochloride Intermediate K
To a solution of methyl 3-(3-((4-(2-((/er/-butoxycarbonyl)amino)ethyl)benzyl)(pent-4-en-l- yl)amino)-3-oxopropoxy)propanoate K-3 (2.2 g, 4.62 mmol) in DCM (9 mL) was added 4 N HC1 in dioxane (16.5 mL) and stirred at 0 °C for 1 h. The resulting mixture was concentrated under reduced pressure to afford methyl 3-(3-((4-(2-aminoethyl)benzyl)(pent-4-en-l-yl)amino)-3- oxopropoxy)propanoate hydrochloride Intermediate K. LCMS (ESI) calc’d for C21H33CIN2O4 [M - HC1 + H]+: 377.2, found 377.2.
Step A: Preparation of intermediate L-l
To a solution of (S)- 1 -((.S')-2-((2.S',3/?)-2-((te/7-butoxycarbonyl)amino)-3-hydiOxybutanamido)-3-(4- methoxyphenyl)propanoyl)-2-methylpyrrolidine-2-carboxylic acid Intermediate A (2.2 g, 4.33 mmol) in DMF (40 mL) were added HATU (1.69 g, 4.33 mmol), methyl 3-(3-((4-(2- aminoethyl)benzyl)(pent-4-en-l-yl)amino)-3-oxopropoxy)propanoate hydrochloride Intermediate K (1.79 g, 4.33 mmol) and DIEA (4.54 mL, 26.0 mmol) at 0 °C. The mixture solution was stirred at 0 °C for 1 h. The resulting mixture was diluted with brine (160 mL), extracted with EA (2 x 160 mL), washed brine (2 x 50 mL), dried over anhydrous MgSCL and filtered, the filtrate was concentrated under reduced pressure. The residue purified by silica gel column chromatography, eluted with gradient 1% - 5% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford L-l. LCMS (ESI) calc’d for C46H67N5O11 [M + H]+: 866.5, found 866.6.
Step B: Preparation of intermediate L-2
To a solution of L-l (1.45 g, 1.674 mmol) in DCM (6 mL) was added 4 N HC1 in dioxane (11 mL) and stirred at 0 °C for 1 h. The resulting mixture was concentrated under reduced pressure to afford L-2. LCMS (ESI) calc’d for C41H60CIN5O9 [M - HC1 + H]+: 766.5, found. 766.5.
Step C: Preparation of intermediate L-3
To a solution of F (1.16 g, 1.670 mmol) in DMF (20 mL) were added HATU (0.64 g, 1.67 mmol), L- 2 (1.34 g, 1.67 mmol) and DIEA (1.75 mL, 10.0 mmol) at 0 °C. The mixture was stirred at -20 °C
for 1 h. The resulting mixture was diluted with brine (80 mL), extracted with EA (2 x 80 mL), washed brine (2 x 30 mL), dried over anhydrous MgSCE and filtered, the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1% - 10% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford L-3. LCMS (ESI) calc’d for C77H99FN10O16 [M + H]+: 1439.8, found 1440.0. Step D: Preparation of intermediate L-4
To a stirred solution of Zhan IB (0.168 g, 0.229 mmol) in DCM (1100 mL) was stirred at room temperature under nitrogen atmosphere. The mixture was stirred at 30 °C for 0.5 h and was added a solution of L-3 (1.65 g, 1.146 mmol) in DCM (10 mL) in 30 min. The reaction mixture was stirred at 30 °C for 12 h under nitrogen atmosphere and concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 0 - 10% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford L-4. LCMS (ESI) calc’d for C75H95FN10O16 [M + H]+: 1411.7, found 1411.6.
Step E: Preparation of intermediate L-5
To a stirred solution of L-4 (1.39 g, 0.985 mmol) in MeOH (30 mL) was added Pd/C (0.14 g, 0.132 mmol) (dry, 10% wt). The reaction mixture was degassed with hydrogen for three times and stirred at room temperature for 4 h under hydrogen 1.5 atm. The resulting mixture was filtered and the filtrate was concentrated under reduced pressure to afford L-5. LCMS (ESI) calc’d for C75H97FN10O16 [M + H]+: 1413.7, found 1414.0.
Step F: Preparation of intermediate L-6
To a solution of L-5 (1.18 g, 0.835 mmol) in THF (10 mL) were added MeOH (3 mL), Water (3 mL) and 1 M LiOH (3.34 mL, 3.34 mmol) at 0 °C. The reaction mixture was stirred at room temperature for 1 h. The resulting mixture was added 1 M HC1 (3.34 mL) at 0 °C. The mixture was concentrated under reduced pressure to afford L-6. The crude was directly used for next step without further purification. LCMS (ESI) calc’d for C74H95FN10O16 [(M + Na]+: 1421.70, found 1421.9.
Step G: Preparation of intermediate L-7
To a solution of L-6 (1.17 g, 0.835 mmol) in DMF (20 mL) were added HATU (0.35 g, 0.92 mmol), (R)-tert- butyl 3-((((9ii-fluoren-9-yl)methoxy)carbonyl)amino)-2-aminopropanoate hydrochloride
(0.350 g, 0.835 mmol) and DIEA (0.875 mL, 5.01 mmol) at 0 °C. The reaction mixture was stirred at -10 °C for 1 h. The resulting mixture was diluted with brine (80 mL), extracted with EA (2 x 80 mL), washed brine (2 x 100 mL), dried over anhydrous MgS04 and filtered, the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1% - 12% MeOH in DCM. The fractions containing desired product were combined and
concentrated to afford L-7. LCMS (ESI) calc’d for C96H119FN12O19 [M + Na]+: 1785.9, found 1786.7.
Step H: Preparation of intermediate L-8
To a solution of L-7 (500 mg, 0.283 mmol) in DCM (10 mL) was added TFA (10 mF) at -10 °C.
The reaction mixture was stirred at room temperature for 2 h. The resulting mixture was concentrated under reduced pressure. The residue was purified by Flash (Column: Flash C ^ 330 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 100 mF/min; Gradient: 2% B to 2% B in 5 min, 20% B to 50% B in 20 min; Detector: UV 220 nm; Rt = 18 min). The product containing fractions were combined, concentrated under reduced pressure and the residue was re-dissolved in DCM (50 mF) and toluene (50 mF). The mixture was then concentrated under reduced pressure and the residue was re-dissolve in DCM (20 mF) and HC1 (4 M in dioxane, 0.2 mF). The resulting mixture was concentrated under reduced pressure and the residue was re-dissolve in ACN (30 mF) and water (30 mF), and added 1 M HC1 (0.3 mF) at 0 °C and lyophilized to afford L-8. LCMS (ESI) calc’d for C87H104CIFN12O17 [M - HC1 + H]+: 1607.8, found 1608.6.
Step I: Preparation of intermediate L-9
To a solution of 1-8 (400 mg, 0.243 mmol) in DMF (40 mF) were added DIEA (189 mg, 1.460 mmol), DCM (500 mF) and HATU (102 mg, 0.268 mmol) at room temperature. The reaction mixture was stirred at room temperature for 1 h. The resulting mixture was concentrated under reduced pressure to remove DCM, and then diluted with brine (160 mF), extracted with EA (2 x 160 mF), washed brine (2 x 160 mF), dried over anhydrous MgSCL and filtered, the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1% - 12% MeOH in DCM. The fractions containing desired product were combined and concentrated to afford 1-9. FCMS (ESI) calc’d for C87H101FN12O16 [M + H]+: 1589.8, found 1590.6.
Step J: Preparation of intermediate L-10
To a solution of 1-9 (270 mg, 0.170 mmol) in THF (5 mF) were added MeOH (1.5 mF), Water (1.5 mF) and 1 M FiOH (0.68 mF, 0.68 mmol) at 0 °C. The mixture was stirred at room temperature for 1 h. The resulting mixture was concentrated under reduced pressure. The residue was directly purified by Flash (Column: Flash C18 330 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 100 mF/min; Gradient: 2% B to 2% B in 5 min, 20% B to 50% B in 20 min; Detector: UV 220 nm; Rt = 20 min) and concentrated under reduced pressure. The residue was re-dissolved in ACN (30 mF) and water (30 mF), then added 1 M HC1 (0.2 mF) at 0 °C and lyophilized to afford 1-10. FCMS
(ESI) calc’d for C72H92CIFN12O14 [M - Cf]+: 1367.7, found 1367.8. 6 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mL), followed by 20% ACN in water (2 x 10 mL). A solution of above 17 mg TFA salt in 65% ACN in water (2 mL x 2) was loaded onto the resin column, the column was eluted with 65% ACN in water (80 mL). The eluents were combined and lyophilized to give I HC1 salt. LCMS (ESI) calc’d for C72H92CIFN12O14 [M - Cl ]+: 1367.7, found 1367.8.
Step A: Tert-butyl 3-(2-(2-hydroxyethoxy)ethoxy)propanoate M-l
To a stirred mixture of 2, 2'-oxydiethanol (24.8 g, 234 mmol) in THF (150 mL) was added sodium (0.054 g, 2.34 mmol) at ambient temperature and added feri-butyl acrylate (10 g, 78 mmol) at ambient temperature until the sodium was dissolved. The resulting mixture was stirred for 16 h at ambient temperature. The reaction mixture was quenched by the addition of sat NH4CI (100 mL). The mixture was extracted with EA (3 x 100 mL). The organic extracts were combined, washed with brine (100 mL), dried over anhydrous Na2S04 and filtered. The filtrate was concentrated under vacuum. The residue was purified by silica gel column chromatography, eluted with gradient 40% - 60% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford teri-butyl 3-(2-(2-hydroxyethoxy)ethoxy)propanoate M-l. 111 NMR (300 MHz, CDCI3) d 3.79-3.70 (m, 4H), 3.68-3.56 (m, 6H), 2.51 (t, J = 6.3 Hz, 2H), 2.37 (s, 1H), 1.45 (s, 9H).
Step B: Tert-butyl 3-(2-(2-bromoethoxy)ethoxy)propanoate M-2
To a stirred mixture of fe/7-butyl 3-(2-(2-hydroxyethoxy)ethoxy)propanoate M-l (5.00 g, 21.3 mmol) and CBr4 (21.2 g, 64.0 mmol) in DCM (50 mL) was added PPI13 (16.8 g, 64.0 mmol) at 0 °C . The resulting mixture was stirred at 0 °C for 2 h. The reaction mixture was quenched by the addition of water (100 mL). The solid was collected by filtration. The filtrate was extracted with EA (3 x 100
mL). The organic extracts were combined, washed with saturated aqueous sodium chloride (100 mL), dried over anhydrous Na2S04 and filtered. The filtrate was concentrated under vacuum. The residue was purified by silica gel column chromatography, eluted with gradient 20% - 50% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford fe/7-butyl 3-(2-(2-bromoethoxy)ethoxy)propanoate M-2. 111 NMR (400 MHz, CD3OD) d 3.81 (t, J= 6.0 Hz, 2H), 3.73 (t, J = 6.4 Hz, 2H), 3.68-3.60 (m, 4H), 3.52 (t, J= 6.0 Hz, 2H), 2.50 (t, J = 6.2 Hz, 2H), 1.48 (s, 9H).
Step C: 3-(2-(2-Bromoethoxy)ethoxy)propanoic acid M-3
To a stirred mixture of fe/7-butyl 3-(2-(2-bromoethoxy)ethoxy)propanoate (4.90 g, 16.49 mmol) in DCM (25 mL) was added TFA (25 mL) at 0 °C. The resulting mixture was stirred for 2 h at ambient temperature. The solution was evaporated under vacuum to afford 3-(2-(2- bromoethoxy)ethoxy)propanoic acid M-3. 111 NMR (300 MHz, D SO-uV,) d 3.78-3.70 (m, 2H), 3.67-3.48 (m, 8H), 2.46 (t, J = 6.3 Hz, 2H).
Step D: Methyl 3-(2-(2-bromoethoxy)ethoxy)propanoate and methyl 3-(2-(2- iodoethoxy)ethoxy)propanoate (1:1) M-4
To a stirred mixture of 3-(2-(2-bromoethoxy)ethoxy)propanoic acid M-3 (3.50 g, 14.5 mmol) and NaHC(¾ (4.88 g, 58.1 mmol) in DMF (20 mL) was added Mel (8.24 g, 58.1 mmol) at 0 °C. The resulting mixture was stirred at ambient temperature for 16 h. The reaction mixture was quenched by the addition of water (200 mL). The mixture was extracted with EA (3 x 100 mL). The organic extracts were combined, washed with brine (100 mL), dried over anhydrous Na2SC>4 and filtered.
The filtrate was concentrated under vacuum. The residue was purified by silica gel column chromatography, eluted with gradient 20% - 45% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford the mixture of methyl-3 -(2-(2- bromoethoxy)ethoxy)propanoate and methyl-3-(2-(2-iodoethoxy)ethoxy)propanoate (1:1) M-4. LCMS (ESI) calc’d for C8Hi5Br04 [M + H]+: 255.0, 257.0, found 255.1 and 257.1; LCMS (ESI) calc’d for CsHisKE [M + H]+: 303.0, found 303.0. ¾ NMR (400 MHz, CDCb) d 3.86-3.75 (m,
4H), 3.72 (s, 3H), 3.69-3.63 (m, 4H), 3.50 (t , J = 6.4 Hz, 1H), 3.28 (t, J = 6.8 Hz, 1H), 2.64 (t, J=
6.4 Hz, 2H).
Step E: Methyl 2,2,8-trimethyl-4-oxo-3,l 1 ,14-trioxa-5,8-diazaheptadecan-l 7-oate M-5 To a solution of methyl 3-(2-(2-bromoethoxy)ethoxy)propanoate compound with methyl 3-(2-(2- iodoethoxy)ethoxy)propanoate M-4 (1:1) (400.0 mg, 1.436 mmol) in EtOH (4 mL) was added tert- butyl (2-(methylamino)ethyl)carbamate (1251 mg, 7.18 mmol) at RT. The mixture was stirred at RT for 16 h. The resulting mixture was concentrated under reduced pressure and the residue was purified by silica gel column chromatography, eluted with gradient 0 - 5% MeOH in DCM. The fractions
containing desired product were combined and concentrated to afford methyl 2,2,8-trimethyl-4-oxo- 3,1 l,14-trioxa-5,8-diazaheptadecan-17-oate M-5. LCMS (ESI) calc’d for C16H32N2O6 [M + H]+:
349.2, found 349.3. ¾ NMR (400 MHz, CDCI3): d 3.76 (t, J = 6.5 Hz, 2H), 3.69 (s, 3H), 3.67-3.51 (m, 6H), 3.21 (q, J = 6.1, 5.6 Hz, 2H), 2.68-2.48 (m, 6H), 2.30 (s, 3H), 1.44 (s, 9H).
Step F: 2-((T ert-butoxycarbonyl)amino)-N-(2-(2-(3-methoxy-3-oxopropoxy)ethoxy)ethyl)-N,N- dimethylethanaminium iodide M-6
To a stirred solution of methyl 2,2,8-trimethyl-4-oxo-3,l l,14-trioxa-5,8-diazaheptadecan-17-oate M-5 (440.0 mg, 1.263 mmol) in ACN (10 mL) was added Mel (0.395 mL, 6.31 mmol). The reaction mixture was stirred at RT for 36 h. The resulting mixture was concentrated under reduced pressure to afford 2-((te/t-butoxycarbonyl)amino)-/V-(2-(2-(3-mcthoxy-3-oxopropoxy)cthoxy)cthyl)-/V,/V- dimethylethanaminium iodide M-6. LCMS (ESI) calc’d for C17H35IN2O6 [M - T]+: 363.3, found
363.3.
Step G: 2-amino-N-(2-(2-(3-methoxy-3-oxopropoxy)ethoxy)ethyl)-N,N-dimethylethanaminium chloride hydrochloride M
To a stirred solution of 2-((ter/-butoxycarbonyl)amino)-A-(2-(2-(3-methoxy-3- oxopropoxy)ethoxy)ethyl)-/V,/V-dimethylethanaminiu m iodide M-6 (600 mg, 1.224 mmol) in 4 M HC1 in dioxane (12 mL) was stirred at RT for 4 h. The resulting mixture was concentrated under reduced pressure. The residue was dissolved in Et20, stirred at RT for 2 h. Filtered solids, washed with Et20 (100 mL) to afford 2 - a m i n 0 - /V- ( 2 - ( 2 - ( 3 - m e th 0 x y - 3 - 0 x 0 p r 0 p 0 x y ) e th 0 x y ) e th yl ) - /V , /V- dimethylethanaminium chloride hydrochloride M. LCMS (ESI) calc’d for C12H28CI2N2O4 [M - HC1 - CF]+: 263.2, found 263.3.
Step A: (S)-methyl 5-(tert-butoxycarbonyl)-3 ,8-dioxo-l -phenyl-2, 12, 15-trioxa-4,9-diazaheptadecan- 17-oate N-1
To a stirred solution of (S)-4-((( benzyl oxy (carbonyl )amino)-5-(tcrt-butoxy)-5-oxopcntanoic acid (8.68 g, 25.7 mmol) in DMF (50 mL) were added FIATU (10.7 g, 28.1 mmol), methyl 2-(2-(2- aminoethoxy)ethoxy)acetate hydrochloride (5.00 g, 23.40 mmol) and DIEA (32.7 mL, 187 mmol) at 0 °C under nitrogen atmosphere. The reaction solution was stirred at 0 °C for 1 h. The reaction was quenched with water (200 mL), extracted with EA (2 x 100 mL). The combined organic layer was
washed with brine (3 x 200 mL), dried over anhydrous Na2S04 and filtered. The filtrate was concentrated under reduced pressure and the residue was purified by silica gel column chromatography, eluted with 0 - 30% EA in PE to afford (.S')- methyl 5-(/er/-butoxycarbonyl)-3,8- dioxo-1 -phenyl-2, 12,15 -trioxa-4,9-diazaheptadecan-17-oate N-l. LCMS (ESI) calc’d for C24H36N2O9 [M + H]+: 497.2, found 497.2; *H NMR (400 MHz, CDCI3): d 7.37-7.28 (m, 5H), 5.10
(s, 2H), 4.30-4.16 (m, 1H), 4.14 (s, 2H), 3.74 (s, 3H), 3.72-3.67 (m, 2H), 3.67-3.62 (m, 2H), 3.69- 3.63 (m, 2H), 3.50-3.36 (m, 2H), 2.37-1.84 (m, 4H), 1.45 (s, 9H).
Step B: (S)-tert-butyl 2-amino-5-((2-(2-(2-methoxy-2-oxoethoxy)ethoxy)ethyl)amino)-5- oxopentanoate N To a solution of (S)-mcthyl 5-(fe/7-butoxycarbonyl)-3,8-dioxo- 1 -phenyl-2, 12, 15-trioxa-4,9- diazaheptadecan-17-oate N-l (9 g, 18.13 mmol) in THF (150 mL) was added Pd/C (900 mg, 0.846 mmol, dry, 10% wt) at room temperature under nitrogen atmosphere. The mixture was degassed with hydrogen for 3 times and stirred for 16 h at room temperature. The reaction mixture was filtered and the filtrate was concentrated under reduced pressure to afford (S)-tert- butyl 2-amino-5-((2-(2-(2- methoxy-2-oxoethoxy)ethoxy)ethyl)amino)-5-oxopentanoate Intermediate N. LCMS (ESI) calc’d for C16H30N2O7 [M + H]+: 363.2, found 363.2.
Preparation of intermediate O
Step A: Methyl 2,2-dimethyl-4,13-dioxo-3,8,ll,17,20-pentaoxa-5,14-diazadocosan-22-oate la To a solution of 2,2-dimethyl-4-oxo-3,8,ll-trioxa-5-azatridecan-13-oic acid (3.33 g, 12.6 mmol) in DMF (30 mL) were added methyl 2-(2-(2-aminoethoxy)ethoxy)acetate hydrochloride (2.70 g, 12.6 mmol), FIATU (4.80 g, 12.6 mmol) and DIEA (6.53 g, 50.5 mmol) at 0 °C. The mixture was stirred at RT for 1 h. The mixture was diluted with brine (120 mL), extracted with EA (2 x 120 mL), washed brine (2 x 50 mL), dried over anhydrous MgSCL and filtered, the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with
gradient 1% - 8% MeOH in DCM. The fractions containing desired product were combined and concentrated to give methyl 2,2-dimethyl-4,13-dioxo-3,8,ll,17,20-pentaoxa-5,14-diazadocosan-22- oate la. LCMS (ESI) calc’d for C18H34N2O9 [M + H]+: 445.2, found 445.3. ¾ NMR (400 MHz, CDCI3): d 4.16 (s, 2H), 4.02 (s, 2H), 3.77 (s, 3H), 3.76-3.71 (m, 2H), 3.69 (dq, J = 5.3, 2.2 Hz, 4H), 3.66-3.59 (m, 4H), 3.54 (dq, J = 10.5, 5.2 Hz, 4H), 3.34 (d, J = 5.6 Hz, 2H), 1.45 (s, 91H).
Step B: Methyl 17-amino-10-oxo-3,6,12,15-tetraoxa-9-azaheptadecan-l-oate hydrochloride lb
To a stirred solution of methyl 2,2-dimethyl-4,13-dioxo-3,8,l l,17,20-pentaoxa-5,14-diazadocosan- 22-oate la (3.00 g, 7.10 mmol) in 4 M HC1 in dioxane (30 mL) was stirred at room temperature for 2 h and concentrated under reduced pressure. The residue was re-dissolved in DCM (30 mL) and concentrated under reduced pressure to afford methyl 17-amino-10-oxo-3,6,12,15-tetraoxa-9- azaheptadecan- 1 -oate hydrochloride lb. LCMS (ESI) calc’d for C13H27CIN2O7 [M - HC1 + H]+: 323.2, found 323.2.
Step C: (S)-23-tert-butyl 1-methyl 22-(((benzyloxy)carbonyl)amino)-10,19-dioxo-3,6,12,l 5- tetraoxa-9,18-diazatricosane-l ,23-dioate lc
To a solution of (.S')-4-(((bcnzyloxy (carbonyl )ami no )-5-(fe/V-butoxy)-5-oxopcntanoic acid lb (0.940 g, 2.79 mmol) in DML (10 mL) were added methyl 17-amino-10-oxo-3,6,12, 15-tetraoxa-9- azaheptadecan- 1 -oate hydrochloride (1.00 g, 2.79 mmol), HATU (1.06 g, 2.79 mmol) and DIEA
(1.80 g, 13.9 mmol) at 0 °C. The mixture was stirred at RT for 1 h. The mixture was diluted with brine (40 mL), extracted with EA (2 x 40 mL), washed brine (2 x 30 mL), dried over anhydrous MgSCL and filtered, the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1% - 8% MeOH in DCM. The fractions containing desired product were combined and concentrated to give (S)-23-ter/-butyl 1 -methyl 22- (((benzyloxy)carbonyl)amino)- 10, 19-dioxo-3,6, 12, 15-tetraoxa-9, 18-diazatricosane-l ,23-dioate lc. LCMS (ESI) calc’d for C30H47N3O12 [M + H]+: 642.3, found 642.3. ¾ NMR (400 MHz, CDCI3): d 7.42-7.30 (m, 5H), 5.11 (s, 2H), 4.22 (br, 1H), 4.15 (s, 2H), 4.04 (s, 2H), 3.75 (s, 3H), 3.74-3.61 (m, 8H), 3.58 (dt, J = 10.4, 4.9 Hz, 4H), 3.49 (dt, J = 17.2, 6.2 Hz, 4H), 2.33 (t, J = 7.3 Hz, 2H), 2.26- 2.13 (m, 1H), 2.01-1.91 (m, 1H), 1.47 (s, 9H).
Step D: (S)-23-tert-butyl 1 -methyl 22-amino-l 0, 19-dioxo-3,6, 12, 15-tetraoxa-9, 18-diazatricosane- 1 ,23-dioate Id
To a stirred solution of (.S')-23-fe/V-butyl 1-methyl 22-(((benzyloxy)carbonyl)amino)- 10, 19-dioxo- 3,6,12,15-tetraoxa-9,18-diazatricosane-l,23-dioate lc (700 mg, 1.091 mmol) in THE (20 mL) was added Pd-C (70 mg, 0.066 mmol) (dry, 10% wt). The reaction mixture was degassed with hydrogen
for three times and stirred at room temperature for 4 h under hydrogen 1.5 atm. The resulting mixture was filtered and the filtrate was concentrated under reduced pressure to afford (S)-23-fer/-butyl 1- methyl 22-amino-10,19-dioxo-3,6,12,15-tetraoxa-9,18-diazatricosane-l,23-dioate Id. LCMS (ESI) calc’d for C22H41N3O10 [M + H]+: 508.3, found 508.3; ¾NMR (400 MHz, CDCb) 54.15 (s, 2H), 4.02 (s, 2H), 3.75 (s, 3H), 3.74-3.65 (m, 6H), 3.66-3.59 (m, 4H), 3.59-3.41 (m, 6H), 3.36 (dd, J =
8.7, 4.7 Hz, 1H), 2.36 (t, J= 7.5 Hz, 2H), 2.17-2.04 (m, 1H), 1.87-1.72 (m, 1H), 1.47 (s, 9H).
Step E: Synthesis of intermediate le
To a stirred solution of 18-(fer/-butoxy)-18-oxooctadecanoic acid (1.64 g, 4.43 mmol) in DMF (15 mL) were added HATU (1.68 g, 4.43 mmol), (S)-23-ter/-butyl 1-methyl 22-amino- 10,19-dioxo- 3,6,12,15-tetraoxa-9,18-diazatricosane-l,23-dioate Id (1.5 g, 2.96 mmol) and DIEA (3.91 mL, 23.64 mmol) at 0 °C. The reaction solution was stirred at 0 °C for 1 h. The resulting solution was quenched with water (1 mL) and purified by Flash (Column: Flash C18 330 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 85 mL/min; Gradient: 5% B to 60% B in 10 min, 60% B to 90% B in 25 min; Detector: FTV 220 nm; Rt = 30 min) to afford le. LCMS (ESI) calc’d for C44H81N3O13 [M +
H]+: 860.6, found 860.6. ‘H NMR (300 MHz, CD3OD) 5 4.26 (dd, J = 9.1, 5.1 Hz, 1H), 4.19 (s, 2H), 4.02 (s, 2H), 3.75 (s, 3H), 3.74-3.63 (m, 8H), 3.63-3.55 (m, 4H), 3.50-3.37 (m, 4H), 2.37-2.04 (m, 7H), 2.00-1.81 (m, 1H), 1.68-1.53 (m, 4H), 1.49 (s, 9H), 1.46 (s, 9H), 1.36-1.28 (m, 24H).
Step F: Synthesis of intermediate If
To a stirred solution of le (1.4 g, 1.63 mmol) in THF (14 mL) was added 1 M LiOH (3.26 mL, 3.26 mmol) at 0 °C. The reaction solution was stirred at 0 °C for 1 h. The resulting solution was quenched with 1 M HC1 (3.26 mL) and purified by Flash (Column: Flash C18 80 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 60 mL/min; Gradient: 1% B to 1% B in 5 min, 60% B to 90% B in 20 min; Detector: UV 220 nm; Rt = 20 min). The fractions containing desired product were combined and concentrated to afford If. LCMS (ESI) calc’d for C43H79N3O13 [M + H]+: 846.6, found 846.6. ‘HNMR (400 MHz, CD3OD) 54.27 (dd, J = 9.2, 5.0 Hz, 1H), 4.15 (s, 2H), 4.03 (s, 2H), 3.76-3.64 (m, 8H), 3.64-3.55 (m, 4H), 3.49-3.44 (m, 2H), 3.40 (t, J = 5.6 Hz, 2H), 2.37-2.20 (m, 6H), 2.18-2.05 (m, 1H), 1.99-1.84 (m, 1H), 1.71-1.53 (m, 4H), 1.49 (s, 9H), 1.46 (s, 9H), 1.36-1.28 (m, 24H).
Step G: Synthesis of intermediate lg
To a stirred solution of If (300 mg, 0.36 mmol) in DMF (3 mL) and water (0.3 mL) were added M (238 mg, 0.71 mmol), HATU (202 mg, 0.53 mmol) and DIEA (0.37 mL, 2.13 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with water (1 mL) and purified by Flash (Column: Flash C18 80 g; Mobile Phase A: water (0.05% TFA), Mobile Phase
B: ACN; Flow rate: 65 mL/min; Gradient: 10% B to 30% B in 10 min, 30% B to 70% B in 20 min; Detector: UV 220 nm; Rt = 25 min) to afford lg. LCMS (ESI) calc’d for C57H104F3N5O18 [M - TFA ]+: 1090.7, found 1090.7. ‘H NMR (400 MHz, CD3OD): d 4.27 (dd, J= 9.2, 5.2 Hz, 1H), 4.06 (s,
2H), 4.03 (s, 2H), 4.00-3.94 (m, 2H) 3.76 (t, J = 6.0 Hz, 3H), 3.73-3.55 (m, 24H), 3.48 (t, J = 5.6 Hz, 2H), 3.44-3.36 (m, 2H), 3.25 (s, 6H), 2.61 (t, J = 6.0 Hz, 2H), 2.35-2.19 (m, 6H), 2.18-2.05 (m, 1H), 1.98-1.84 (m, 1H), 1.68-1.53 (m, 4H), 1.48 (s, 9H), 1.46 (s, 9H), 1.36-1.28 (m, 24H).
Step H: Synthesis of intermediate lh
To a stirred solution of lg (370 mg, 0.31 mmol) in THF (4 mL) was added 1 M LiOH (0.62 mL, 0.62 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with 1 M HC1 (0.62 mL) and purified by Flash (Column: Flash
80 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 60 mL/min; Gradient: 1% B to 30% B in 10 min, 30% B to 60% B in 15 min; Detector: UV 220 nm; Rt = 22 min) to lh. LCMS (ESI) calc’d for C56H102F3N5O18 [M - TFA ]+: 1076.7, found 1076.7. ‘H NMR (400 MHz, CD3OD): d 4.26 (dd, J = 9.0, 5.1 Hz, 1H), 4.05 (s, 2H), 4.02 (s, 2H), 3.99-3.92 (m, 2H), 3.79-3.53 (m, 24H), 3.47 (t, J = 5.6 Hz, 2H), 3.42-3.35 (m, 2H), 3.23 (s, 6H), 2.56 (t, J= 5.9 Hz, 2H), 2.35-2.02 (m, 7H), 1.98-1.82(m, 1H), 1.70-1.51 (m, 4H), 1.48 (s, 9H), 1.45 (s, 9H), 1.39-1.24 (m, 24H).
Step I: Synthesis of intermediate li
To a stirred solution of lh (300 mg, 0.25 mmol) in DMF (3 mL) and water (0.3 mL) were added (S)- t e/7- butyl 2-amino-5-((2-(2-(2-methoxy-2-oxoethoxy)ethoxy)ethyl)amino)-5-oxopentanoate (100 mg, 0.28 mmol), HATU (105 mg, 0.28 mmol) and DIEA (0.22 mL, 1.26 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with water (2 mL) and purified by Flash (Column: Flash C18 80 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 65 mL/min; Gradient: 10% B to 30% B in 10 min, 30% B to 70% B in 20 min; Detector: UV 220 nm; Rt = 24 min) to afford li. LCMS (ESI) calc’d for C72H130F3N7O24 [M - TFA ]+: 1420.9, found 1420.8. ‘HNMR (400 MHz, CD3OD): d 4.35-4.22 (m, 2H), 4.18 (s, 2H), 4.05 (s, 2H), 4.02 (s, 2H), 3.99-3.93 (m, 2H), 3.81-3.52 (m, 33H), 3.51-3.34 (m, 6H), 3.24 (s, 6H), 2.57-2.45 (m, 2H), 2.40-2.00 (m, 10H), 1.98-1.84 (m, 2H), 1.68-1.53 (m, 4H), 1.52-1.42 (m, 27H), 1.38-1.27 (m, 24H).
Step J: Synthesis of intermediate lj
To a solution of li (250 mg, 0.16 mmol) in THF (2.5 mL) was added 1 M LiOH (0.32 mL, 0.32 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with 1 M HC1 (0.32 mL) and purified by Flash (Column: Flash C18 80 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 60 mL/min; Gradient: 1% B to 30% B in 10 min, 30% B to 60% B
in 15 min; Detector: UV 220 nm; Rt = 18 min). The fractions containing desired product were combined and concentrated. The residue was re-dissolved in ACN (3 mL) and water (5 mL), and added 1 N HC1 (0.12 mL) at 0 °C. The solution was lyophilized to afford lj. LCMS (ESI) calc’d for C69H128CIN7O22 [M - Cl ]+: 1406.9, found 1406.9. ‘HNMR (400 MHz, CD3OD): d 4.33-4.27 (m, 2H), 4.15 (s, 2H), 4.06 (s, 2H), 4.03 (s, 2H), 3.98 (s, 2H), 3.82-3.65 (m, 24H), 3.64-3.54 (m, 6H), 3.48 (t, J = 5.6 Hz, 2H), 3.43-3.36 (m, 4H), 3.26 (s, 6H), 2.60-2.48 (m, 2H), 2.37-2.18 (m, 10H), 2.18-2.05 (m, 1H), 2.02-1.85 (m, 1H), 1.67-1.54 (m, 4H), 1.52-1.44 (m, 27H), 1.38-1.27 (m, 24H). Step K: Synthesis of lk
To a solution of D (15.0 mg, 10.7 pmol) in DMF (300 pL) and water (30 pF) was added lj (21.7 mg, 0.015 mmol) at room temperature. After cooling to -20 °C, HATU (8.17 mg, 0.021 mmol) and DIEA (15 pL, 0.086 mmol) were added to the mixture. The solution was stirred at 0 °C for 0.5 h. The reaction solution was quenched with water (100 pL) and purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 45 mF/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 254/210 nm; Rt = 22 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (5 mF) and water (5 mF), lyophilized to afford lk. FCMS (ESI) calc’d for C139H205F4N21O35 [(M - TFA + H)/2]+: 1346.1, found 1346.6.
Step L: Synthesis of 11
To a solution of lk (24.0 mg, 8.55 pmol) in DCM (4.8 mF) was added TFA (6 mF, 78 mmol) at - 20 °C. The reaction mixture was stirred at room temperature for 1 h. The reaction solution was concentrated under reduced pressure and purified by Flash (Column: Flash C 18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 45 mF/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 220 nm; Rt = 20 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re dissolved in ACN (5 mF) and water (5 mF), lyophilized to afford 11. FCMS (ESI) calc’d for C 131H189F4N21O35 [(M - TFA + H)/2]+: 1290.2, found 1291.2.
Step M: Synthesis of Example 1
5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mF), followed by 20% ACN in water (2 x 10 mF). A solution of 11 (14 mg, 5.20 pmol) in 60% ACN in water (20 mF) was loaded onto the resin column, and the column was eluted with 60% ACN in water (4 x 20 mF). The eluents were combined, water (5 x 4 mF) added, lyophilized to afford Example 1. FCMS (ESI) calc’d for C129H189CIFN21O33 [M - Cl ]+: 2579.4, found 2579.4; [(M - Cf + H)/2]+: 1290.2, found 1290.8.
Preparatory Example 2
Step A: 9-Hydroxynonanoic acid 2a
To a stirred solution of methyl 9-hydroxynonanoate (5.00 g, 26.6 mmol) in THF (50 mL) was added 1 M LiOH (53.1 mL, 53.1 mmol) at room temperature. The reaction solution was stirred at room temperature for 1 h. The pH value of the solution was adjusted to 2 with 1 N HC1. The solution was extracted with EA (2 x 100 mL). The combined organic layer was washed with brine (3 x 200 mL), dried over anhydrous Na2SC>4 and filtered. The filtrate was concentrated under reduced pressure to afford 9-hydroxynonanoic acid 2a. 111 NMR (400 MHz, CDCfi) d 3.64 (t, J- 6.6 Hz, 2H), 2.34 (t, J = 7.5 Hz, 2H), 1.66-1.52 (m, 4H), 1.38-1.29 (m, 8H).
Step B: Tert-butyl 9-hydroxynonanoate 2b
To a solution of 9-hydroxynonanoic acid 2a (4.60 g, 26.4 mmol) in DCM (50 mL) was added tert- butyl /V, /V - d i i s 0 p ro py l c arb am i m i d ate (26.4 g, 132 mmol) at room temperature. The reaction solution was stirred at 50 °C for 5 h. The resulting solution was concentratred under reduced pressure. The residue was purified by silica gel column chromatography, eluted with gradient 1% - 30% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford iert-butyl 9-hydroxynonanoate 2b. 111 NMR (400 MHz, CDCb) d 3.64 (t, J- 6.6 Hz, 2H), 2.20 (t, J = 7.5 Hz, 2H), 1.61-1.52 (m, 4H), 1.44 (s, 9H), 1.36-1.27 (m, 8H).
Step C: Tert-butyl 9-bromononanoate 2c
To a stirred solution of fe/7-butyl 9-hydroxynonanoate (3.00 g, 13.0 mmol) in DCM (10 mL) were added CBr4 (8.64 g, 26.0 mmol) and PI13P (5.12 g, 19.5 mmol) at 0 °C under nitrogen atmosphere.
The reaction solution was stirred at room temperature for 2 h. The resulting solution was concentrated under reduced pressure and the residue was purified by silica gel column chromatography, eluted with 0 - 10% EA in PE to afford tert-butyl 9-bromononanoate 2c. 111 NMR (400 MHz, CDCE): d 3.41 (t, J = 6.8 Hz, 2H), 2.20 (t, J = 7.5 Hz, 2H), 1.90-1.80 (m, 2H), 1.61-1.39 (m, 13H), 1.36-1.26 (m, 6H).
Step D: Tert-butyl 9-((6-hydroxyhexyl)oxy)nonanoate 2d
To a stirred solution of fe/7-butyl 9-bromononanoate 2c (3.30 g, 11.2 mmol) and heptane- 1,7-diol (2.98 g, 22.5 mmol) in benzene (40 mL) were added 50% aqueous NaOH (16 mL) and TBAHS (3.82 g, 11.25 mmol) at 0 °C. The reaction mixture was stirred at room temperature for 16 h. The resulting solution was diluted with water (50 mL). The solution was extracted with EA (3 x 100 mL). The organic layer was washed with brine (3 x 300 mL), dried over anhydrous Na2S04 and filtered. The residue was purified by silica gel column chromatography, eluted with gradient 0% - 30% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford tert-butyl 9-((6-hydroxyhexyl)oxy)nonanoate 2d. 111 NMR (400 MHz, CDCI3) d 3.64 (t, J- 6.6 Hz, 2H), 3.45-3.33 (m, 4H), 2.20 (t, J = 7.5 Hz, 2H), 1.59-1.55 (m, 8H), 1.44 (s, 9H), 1.39-1.25 (m, 14H).
Step E: Tert-butyl 9-((7-oxoheptyl)oxy)nonanoate 2e
To a stirred solution of tert-butyl 9-((7-hydroxyheptyl)oxy)nonanoate 2d (1.90 g, 5.50 mmol) in DCM (20 mL) was added DMP (4.68 g, 11.0 mmol) at 0 °C. The reaction mixture was stirred at room temperature for 2 h. The resulting solution was quenched by sat’d Na2S203/NaHC03 solution (100 mL) and diluted with EA (2 x 50 mL). The organic layer was washed by brine (3 x 100 mL), dried with anhydrous Na2SC>4 and filtered. The filtrate was concentrated under reduced pressure and purified by a silica gel column chromatography, eluted with gradient 0% - 10% EA in PE. The fractions containing desired product were combined and concentrated under reduced pressure to afford teri-butyl 9-((7-oxoheptyl)oxy)nonanoate 2e. 111 NMR (400 MHz, CDCI3) d 9.76 (t, J- 1.8 Hz, 1H), 3.45-3.29 (m, 4H), 2.47-2.38 (m, 2H), 2.20 (t, J = 7.5 Hz, 2H), 1.68-1.53 (m, 8H), 1.44 (s, 9H), 1.40-1.26 (m, 12H).
Step F: (E)-benzyl 9-((9-(tert-butoxy)-9-oxononyl)oxy)non-2-enoate 2f
To a stirred solution of teri-butyl 9-((7-oxoheptyl)oxy)nonanoate 2e (1.20 g, 3.50 mmol) in toluene (20 mL) was added benzyl (triphenyl phosphaneylidene) acetate (2.88 g, 7.01 mmol) at room temperature. The reaction solution was stirred at room temperature for 16 h. The solution was concentrated under reduced pressure and the residue was purified by silica gel column chromatography, eluted with gradient 0% - 5 % EA in PE. The fractions containing the desired product were combined and concentrated under reduced pressure to afford (/fi-benzyl 9-((9-(tert-
butoxy)-9-oxononyl)oxy)non-2-enoate 2f. 111 NMR (400 MHz, CDCI3) d 7.42-7.28 (m, 5H), 7.01 (dt, J = 15.7, 7.0 Hz, 1H), 5.86 (dt, J = 15.7, 1.6 Hz, 1H), 5.17 (s, 2H), 3.38 (td, J = 6.7, 1.0 Hz, 4H), 2.26-2.14 (m, 4H), 1.61-1.53 (m, 6H), 1.50-1.41 (s, 11H), 1.38-1.24 (m, 12H).
Step G: 9-((9-(Tert-butoxy)-9-oxononyl)oxy)nonanoic acid 2g
To a solution of (£)-benzyl 9-((9-(fe/7-butoxy)-9-oxononyl)oxy)non-2-cnoatc 2f (900 mg, 1.90 mmol) in THF (20 mL) was added Pd/C (100 mg, 0.094 mmol, dry, 10% wt) at room temperature under nitrogen atmosphere. The mixture was degassed with hydrogen for three times and stirred at room temperature for 16 h under hydrogen (1.5 atm). The reaction mixture was filtered and the filtrate was concentrated under reduced pressure to afford 9-((9-(ter/-butoxy)-9- oxononyl)oxy)nonanoic acid 2g. ‘H NMR (400 MHz, CDCI3) d 3.39 (t, J - 6.7 Hz, 4H), 2.35 (t, J- 7.5 Hz, 2H), 2.20 (t, J = 7.5 Hz, 2H), 1.67-1.49 (m, 8H), 1.44 (s, 9H), 1.38-1.26 (m, 16H).
Step H: (S)-21 ,40-di-tert-butyl 1-methyl 9, 18, 23-trioxo-2,5, 11 , 14,32-pentaoxa-8, 17,22- triazatetracontane-1 ,21 ,40-tricarboxylate 2h
To a solution of 9-((9-(fe/7-butoxy)-9-oxononyl)oxy)nonanoic acid 2g (293 mg, 0.759 mmol) in DMF (4 mL) were added HATU (288 mg, 0.759 mmol), (.S')-23-fe/7-butyl 1-methyl 22-amino- 10, 19- dioxo-3,6,12,15-tetraoxa-9,18-diazatricosane-l,23-dioate Id (350 mg, 0.690 mmol) and DIEA
(0.602 mL, 3.45 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with water (200 pL) and purified by reversed phrase Flash (Column: Flash
Cl 80 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 65 mL/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 15 min, 60% B to 98% B in 20 min; Detector: UV 210 nm; Rt = 25 min). The fractions containing desired product were combined and concentrated under reduced pressure to afford 2h. LCMS (ESI) calc’d for C44I Li N3O14 [M + H]+: 876.6, found 876.6; ‘H NMR (400 MHz, CD3OD) d 4.27-4.21 (m, 1H), 4.17 (s, 2H), 4.00 (s, 2H), 3.78-3.61 (m, 11H), 3.61-3.52 (m, 4H), 3.46-3.36 (m, 8H), 2.32-2.17 (m, 6H), 2.15-1.84 (m, 2H), 1.64-1.51 (m, 8H), 1.48 -1.42 (m, 18H), 1.38-1.30 (m, 16H).
Step I: Synthesis of intermediate 2i
To a solution of 2h (500 mg, 0.57 mmol) in THF (5 mL) was added 1 M LiOH (1.14 mL, 1.14 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with 1 M HC1 (1 mL) and purified by reversed phrase Flash (Column: Flash C ^ 80 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 65 mL/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 15 min; Detector: UV 210 nm; Rt = 20 min). The fractions containing desired product were combined and concentrated under reduced pressure to afford 2i. LCMS (ESI) calc’d for C43H79N3O14 [M + H]+: 862.6, found 862.5. ‘HNMR (300 MHz, CD3OD) d 4.29-4.19 (m,
1H), 4.13 (s, 2H), 4.00 (s, 2H), 3.73-3.62 (m, 8H), 3.61-3.52 (m, 4H), 3.48-3.34 (m, 8H), 2.34-2.16 (m, 6H), 2.16-1.82 (m, 2H), 1.66-1.48 (m, 8H), 1.48-1.42 (m, 18H), 1.40-1.26 (m, 16H).
Step J: Synthesis of intermediate 2j
To a solution of 2i (200 mg, 0.232 mmol) in DMF (2 mL) and water (200 pL) were added HATU
(97.0 mg, 0.255 mmol), M (148 mg, 0.464 mmol) and DIEA (0.243 mL, 1.392 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The esulting solution was purified by reversed phrase Flash (Column: Flash
80 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 65 mL/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 15 min, 60% B to 98% B in 20 min; Detector: UV 210 nm; Rt = 23 min). The fractions containing desired product were combined and concentrated under reduced pressure to afford 2j. LCMS (ESI) calc’d for C56H102F3N5O19 [M - TFA ]+: 1092.7, found 1092.7; ¾ NMR (400 MHz, CD3OD) d 4.28-4.20 (m, 1H), 4.18-4.10 (m, 2H), 4.06-3.96 (m, 6H), 3.78-3.63 (m, 18H), 3.62-3.53 (m, 6H), 3.52-3.33 (m, 9H), 3.27-3.21 (m, 6H), 2.32-2.16 (m, 6H), 2.10-1.82 (m, 2H), 1.68-1.50 (m, 8H), 1.50-1.40 (m, 18H), 1.40-1.28 (m, 16H).
Step K: Synthesis of 2k
To a solution of 2j (240 mg, 0.199 mmol) in THF (2.5 mL) was added 1M LiOH (0.398 mL, 0.398 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with 1 M HC1 (0.4 mL) and purified by Flash (Column: Flash C^ 80 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 65 mL/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 15 min; Detector: UV 210 nm; Rt = 20 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (3 mL) and water (5 mL), and added 1 N HC1 (0.2 mL) at 0 °C. The solution was lyophilized to afford 2k. LCMS (ESI) calc’d for C53H100CIN5O17 [M - Cf]+: 1078.7, found 1078.7. ¾ NMR (400 MHz, CD3OD) d 4.27-4.21 (m, 1H), 4.13 (s, 2H), 4.06-4.96 (m, 6H), 3.79-3.63 (m, 16H), 3.63-3.52 (m, 6H), 3.49-3.35 (m, 8H), 3.28-3.20 (m, 6H), 2.34-2.17(m, 6H), 2.10-1.83 (m, 2H), 1.65-1.51 (m, 8H), 1.49-1.41 (m, 18H), 1.40-1.29 (m, 16H).
Step L: Synthesis of 21
To a solution of D (20.0 mg, 0.014 mmol) in DMF (300 pL) and water (30 pL) was added 2k (22.4 mg, 0.020 mmol) at room temperature. After cooling to -20 °C, HATU (10.9 mg, 0.029 mmol) and DIEA (20 pL, 0.115 mmol) were added to the mixture. The mixture was stirred at 0 °C for 0.5 h. The reaction solution was quenched with water (100 pL) and purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 45 mL/min; Gradient: 2% B to 2% B in 5 min, 25% B to 80% B in 25 min; Detector: UV 254/210 nm; R1= 23 min). The fractions
containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (5 mL) and water (5 mL), lyophilized to afford 21. LCMS (ESI) calc’d for C 127H185F4N19O30 [(M - TFA + H)/2]+: 1210.2, found 1211.1.
Step M: Synthesis of 2m To a solution of 21 (30.0 mg, 0.012 mmol) in DCM (6 mF) was added TFA (7.5 mL, 97 mmol) at - 20 °C. The reaction mixture was stirred at room temperature for 1 h. The reaction solution was concentrated under reduced pressure and purified by Flash (Column: Flash C1840 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 45 mF/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 254/210 nm; Rt = 20 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re dissolved in ACN (5 mF) and water (5 mF), lyophilized to afford 2m. FCMS (ESI) calc’d for C119H169F4N19O30 [(M - TFA + H)/2]+: 1154.1, found 1154.9.
Step N: Synthesis of Example 2
5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mF), followed by 20% ACN in water (2 x 10 mF). A solution of 2m (18.0 mg,
7.43 m mol) in 60% ACN in water (20 mF) was loaded onto the resin column, and the column was eluted with 60% ACN in water (4 x 20 mF). The eluents were combined, water (5 x 4 mF) added, lyophilized to afford Example 2. FCMS (ESI) calc’d for C117H169CIFN19O28 [M - Cl ]+: 2307.2, found 2307.2; [(M - CL+ H)/2]+: 1154.1, found 1154.8.
Preparation of Example 3
Step A: Synthesis of intermediate 3a
To a stirred mixture of (R)-4-(((benzyloxy)carbonyl)amino)-5-(tert-butoxy)-5-oxopentanoic acid (1.5 g, 4.45 mmol) in DMF (15 ml) were added methyl 17-amino-10-oxo-3,6,12,15-tetraoxa-9- azaheptadecan- 1 -oate hydrochloride (2.393 g, 6.67 mmol) andN-ethyl-N-isopropylpropan-2-amine
(0.575 g, 4.45 mmol) at 0 °C. The resulting mixture was stirred for 1 h at 0 °C. The reaction was quenched by water (10 ml). The mixture was purified by reverse phase with the following conditions: Column, Xbridge C18 , 19 xl50 mm; mobile phase: acetonitrile in Water (0.1% TFA) , 34%-95% in 8 min; Detector, UV 254 nm. RT: 6.82 min. The collected fractions were combined and concentrated under reduced pressure to give (R)-23-tert-butyl 1 -methyl 22- (((benzyloxy)carbonyl)amino)- 10, 19-dioxo-3,6, 12, 15-tetraoxa-9, 18-diazatricosane- 1 ,23-dioate 3a. LCMS (ESI) calc’d for C30H47N3O12 [M+H]+: 642.3, found 642.3. ' l l NMR (400 MHz, Methanol- d4) d 7.42 - 7.27 (m, 5H), 5.11 (s, 2H), 4.18 (s, 2H), 4.13-4.04 (m, 1H), 4.02 (s, 2H), 3.75 (s, 3H), 3.73 - 3.68 (m, 4H), 3.68-3.63 (m, 4H), 3.61-3.54 (m, 4H), 3.49-3.43 (m, 2H), 3.41 - 3.36 (m, 2H), 2.38-2.30 (m, 2H), 2.22-2.08 (m, 1H), 1.98-1.79 (m, 1H), 1.47 (s, 9H).
Step B: Synthesis of intermediate 3b
To a stirred solution of (R)-23-tert-butyl 1 -methyl 22-(((benzyloxy)carbonyl)amino)- 10, 19-dioxo- 3,6,12,15-tetraoxa-9,18-diazatricosane-l,23-dioate 3a (2.1 g, 3.27 mmol) in THF (20 ml) was added Pd/C (10% wt, dry) (0.348 g, 0.327 mmol) under nitrogen atmosphere. The reaction mixture was degassed with hydrogen three times and stirred at room temperature for 16 h under hydrogen. The mixture was filtered and the filtrate was concentrated under vacuum to afford (R)-23-tert-butyl 1- methyl 22-amino-10,19-dioxo-3,6,12,15-tetraoxa-9,18-diazatricosane-l,23-dioate 3b. LCMS (ESI) calc’d for C22H41N3O10 [M+H]+: 508.2, found 508.2.
Step C: Synthesis of intermediate 3c
To a stirred mixture of 18-(tert-butoxy)-18-oxooctadecanoic acid (1 g, 2.70 mmol) in DMF (10 ml)were added HATU (1.129 g, 2.97 mmol), (R)- 1 -tert-butyl 5-methyl 2-(18-(tert-butoxy)-18- oxooctadecanamido)pentanedioate 3b (1.2 g, 2.106 mmol, 78 % yield) and N-ethyl-N- isopropylpropan-2-amine (1.744 g, 13.49 mmol) at 0 °C. The resulting mixture was stirred for 1 h at 0 °C. The reaction was quenched by water (50 ml) and extracted with EA (30 ml x 3). The combined organic layers was washed with brine (20 ml x 3) , dried over Na2S04 and filtered. The filtrate was concertrated under reduced pressure and the residue was purified by flash chromatography on silica gel, eluted with 0-30% EA in PE to afford (R)- 1 -tert-butyl 5-methyl 2-(18-(tert-butoxy)-18- oxooctadecanamido)pentanedioate 3c. LCMS (ESI) calc’d for C32H59NO7 [M+H]+: 570.2, found 570.3. ¾ NMR (400 MHz, Chloroform-d) d 6.11 (d, J = 7.8 Hz, 1H), 4.59-4.49 (m, 1H), 3.70 (s, 3H), 2.52 - 2.30 (m, 2H), 2.28-2.14 (m, 5H), 2.03-1.90 (m, 1H), 1.73-1.43 (m, 22H), 1.38 - 1.20 (m, 24H).
Step D: Synthesis of intermediate 3d
To a stirred mixture of (R)- 1 -tert-butyl 5-methyl 2-(18-(tert-butoxy)-18-oxooctadecanamido) pentanedioate (1.2 g, 2.106 mmol) in THF (12 ml) was added a solution of lithium hydroxide (0.403
g, 16.85 mmol) in water (8 ml) four times on average every other hour at 0 °C. The resulting mixture was stirred for 1 h at 0 °C. The PH of the reaction was adjusted to 6 with HC1 (1 N). The mixture was purified by reverse phase with the following conditions: Column, Xbridge Cl 8, 330 g, 19 xl50 mm; mobile phase: acetonitrile in Water (0.1% TFA) , 34%-98% in 25 min; Detector, UV 254 nm. RT: 20 min. The collected fractions were combined and concentrated under reduced pressure to give (R)-5- (tert-butoxy)-4-(18-(tert-butoxy)-18-oxooctadecanamido)-5-oxopentanoic acid 3d. LCMS (ESI) calc’d for C31H57NO7 [M+H]+: 556.4, found 556.4. ¾ NMR (400 MHz, Chloroform-d) d 6.29 (d, J = 7.7 Hz, 1H), 4.66-4.45 (m, 1H), 2.51 - 2.40 (m, 2H), 2.31 - 2.18 (m, 5H), 1.97 - 1.86 (m, 1H), 1.71- 1.42 (m, 22H), 1.38-1.22 (m, 24H).
Step E: Synthesis of intermediate 3e
To a stirred mixture of (R)-5-(tert-butoxy)-4-(18-(tert-butoxy)-18-oxooctadecanamido)-5- oxopentanoic acid 3b (770 mg, 1.385 mmol) in DMF (7 ml) were added HATU (579 mg, 1.524 mmol), (R)-23-tert-butyl 1-methyl 22-amino-10,19-dioxo-3,6,12,15-tetraoxa-9,18-diazatricosane- 1,23-dioate 3d (844 mg, 1.663 mmol) andN-ethyl-N-isopropylpropan-2-amine (1432 mg, 11.08 mmol) at 0 °C. The resulting mixture was stirred for 1 h at 0 °C. The reaction was quenched by water (5 ml). The mixture was purified by reverse phase with the following conditions: Column, Xbridge C18 , 19 xl50 mm; mobile phase: acetonitrile in Water (0.1% TFA) , 34%-95% in 8 min; Detector, UV 254 nm. RT: 6.82 min. The collected fractions were combined and concentrated under reduced pressure to give 3e. LCMS (ESI) calc’d for C53H96N4O16 [M+H]+: 1045.6, found 1045.6. ¾ NMR (400 MHz, Chloroform-d) d 7.26 (s, 1H), 7.10 (t, J = 5.5 Hz, 1H), 7.02 (d, J = 7.6 Hz, 1H), 6.53 (d, J = 7.9 Hz, 1H), 4.52-4.39 (m, 2H), 4.18 (s, 2H), 4.05 (s, 2H), 3.76 - 3.43 (m, 16H), 2.96 (s, 3H), 2.34-2.29(m, 4H), 2.28-2.17 (m, 6H), 2.01 - 1.81 (m, 2H), 1.70-1.55 (m, 4H), 1.54-1.40 (m, 27H), 1.37-1.23 (m, 24H).
Step F: Synthesis of intermediate 3f
To a solution of 3e (0.3 g, 0.287 mmol) in THF (3 mL) was added 1 M lithium hydroxide (0.574 mL, 0.574 mmol) at 0 oC. The mixture was stirred at 0 °C for 1 h. The reaction solution was quenched with 1 M HC1 (0.58 mL) and purified by Flash (Column: Flash C18 120 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 60 mL/min; Gradient: 1% B to 75% B in 10 min, 75% B to 90% B in 20 min; Detector: UV 220 nm; Rt = 28 min) to afford 3f. LCMS (ESI) calc’d for C52H94N4O16 [M+H]+: 1031.7, found 1031.6.
Step G: Synthesis of intermediate 3g
To a solution of 3f (200 mg, 0.19 mmol) in DMF (2 mL) were added HATU (88 mg, 0.233 mmol), DIEA (0.203 mL, 1.16 mmol), and a solution of M (130 mg, 0.388 mmol) in DMF (0.5 mL) and
water (0.2 mL) at -10 °C. The mixture was stirred at -10 °C for 10 min. The reaction solution was quenched with water (200 pL) and purified by Flash (Column: Flash C18 80 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 70 mL/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 15 min, 60% B to 80% B in 10 min; Detector: UV 220 nm; Rt = 22 min). The fractions containing desired product were combined and concentrated. The residue was re dissolved in ACN (10 mL) and water (10 mL), and lyophilized to afford 3g. LCMS (ESI) calc’d for C66H119F3N6O21 [M - TFA ]+: 1275.9, found 1275.8.
Step H: Synthesis of intermediate 3h
To a solution of 3g (220 mg, 0.158 mmol) in THF (2.2 mL) was added 1M LiOH (0.317 mL, 0.317 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The reaction solution was quenched with 1 M HC1 (0.32 mL) and purified by Flash (Column: Flash C18 80 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 70 mL/min; Gradient: 1% B to 1% B in 5 min, 35% B to 70% B in 20 min; Detector: UV 220 nm; Rt = 22 min). The fractions containing desired product were combined and concentrated. The residue was re-dissolved in ACN (5 mL) and water (5 mL), and added 1 N HC1 (0.1 mL) at 0 °C and lyophilized to afford 3h. LCMS (ESI) calc’d for C63H117CIN6O19 [M - Cl ]+: 1261.8, found 1261.8 ‘HNMR (300 MHz, CD3OD) d 4.28 (dd, J = 9.3, 4.7 Hz, 2H), 4.05 (s, 2H), 4.02 (s, 2H), 3.96 (s, 2H), 3.81-3.26 (m, 28H), 3.23 (s, 6H), 2.56 (t, J = 6.0 Hz, 2H), 2.40-2.17 (m, 10H), 1.88 (s, 2H), 1.58 (s, 4H), 1.48 (d, J= 0.9 Hz, 18H), 1.45 (s, 9H), 1.30 (s, 24H).
Step I: Synthesis of 3i
To a solution of D (15.0 mg, 10.7 pmol) in DMF (300 pL) and water (30 pL) was added 3h (19.5 mg, 0.015 mmol) at room temperature. After cooling to -20 °C, HATU (8.17 mg, 0.021 mmol) and DIEA (15.0 pL, 0.086 mmol) were added to the mixture at -20 °C. The mixture was stirred at 0 °C for 0.5 h. The mixture was purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 45 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 70% B in 25 min; Detector: UV 254/210 nm; Rt = 25 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (5 mL) and water (5 mL), lyophilized to afford 3i. LCMS (ESI) calc’d for C137H202F4N20O32 [(M - TFA + H)/2]+: 1301.8, found 1302.4.
Step J: Synthesis of3i
To a solution of 3i (22.0 mg, 8.10 m mol) inDCM (4.4 mL) was added TFA (5.5 mL, 71.4 mmol) at - 20 °C. The reaction mixture was stirred at room temperature for 1 h. The reaction solution was
concentrated under reduced pressure and purified by Flash (Column: Flash C1840 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 45 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 254/210 nm; Rt = 15 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re- dissolved in ACN (5 mL) and water (5 mL), lyophilized to afford 3j. LCMS (ESI) calc’d for C125H178F4N20O32 [(M - TFA + H)/2]+: 1217.6, found 1218.5.
Step K: Synthesis of Example 3
5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mL), followed by 20% ACN in water (2 10 mL). A solution of 3j (14 mg, 5.49 pmol) in 60% ACN in water (20 mL) was loaded onto the resin column, and the column was eluted with 60% ACN in water (3 x 20 mL). The eluents were combined, water (4 x 4 mL) added, lyophilized to afford Example 3. LCMS (ESI) calc’d for C123H178CIFN20O30 [M - Cl ]+: 2434.3, found 2434.3; [(M - Cl + H)/2]+: 1217.6, found 1218.2.
Step A: (S)-l-tert-butyl 5-methyl 2-(16-(tert-butoxy)-l 6-oxohexadecanamido)pentanedioate 4a To a stirred solution of 16-(fer/-butoxy)- 16-oxohexadecanoic acid (1 g, 2.92 mmol) in DMF (12 mL) were added (S)- 1 -feri-butyl 5-methyl 2-aminopentanedioate hydrochloride (0.82 g, 3.21 mmol), FIATU (1.22 g, 3.21 mmol) and DIEA (2.55 mL, 14.60 mmol) at 0 °C. The reaction mixture was
stirred at 0 °C for 1 h. The resulting solution was quenched with water (2 mL) and purified by Flash (Column: Flash
120 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 80 mL/min; Gradient: 10% B to 70% B in 10 min, 70% B to 98% B in 20 min; Detector: UV 220 nm; Rt = 28 min) to afford (.S')- 1 -fe/7-butyl 5-methyl 2-(16-(fer/-butoxy)-16- oxohexadecanamido)pentanedioate 4a. LCMS (ESI) calc’d for C30H55NO7 [M + H]+: 542.4, found 542.4. ¾ NMR (300 MHz, CD3OD): d 4.31 (dd, J = 9.1, 5.3 Hz, 1H), 3.68 (s, 3H), 2.42 (t, J= 7.5 Hz, 2H), 2.22 (q, J = 7.1 Hz, 4H), 2.18- 2.05 (m, 1H), 2.01-1.82 (m, 1H), 1.69-1.52 (m, 4H), 1.47 (s, 9H), 1.45 (s, 9H), 1.38-1.28 (m, 20H).
Step B: (S)-5-(tert-butoxy)-4-(16-(tert-butoxy)-16-oxohexadecanamido)-5-oxopentanoic acid 4b To a stirred solution of (S)- 1 -feri-butyl 5-methyl 2-(16-(fer/-butoxy)-16- oxohexadecanamido)pentanedioate 4a (1.3 g, 2.40 mmol) in THF (13 mL) was added 1 M LiOH (4.80 mL, 4.80 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with 1 M HC1 (4.80 mL) and purified by Flash (Column: Flash C^ 120 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 80 mL/min; Gradient: 1% B to 80% B in 15 min, 80% B to 98% B in 15 min; Detector: UV 220 nm; Rt = 28 min) to afford (S)-5-(tert- butoxy)-4-(16-(ter/-butoxy)-16-oxohexadecanamido)-5-oxopentanoic acid 4b. LCMS (ESI) calc’d for C29H53NO7 [M + H]+: 528.4, found 528.4. ¾ NMR (400 MHz, CD3OD): d 4.32 (dd, J = 9.0, 5.4 Hz, 1H), 2.40 (t, J = 7.5 Hz, 2H), 2.24 (dt, J = 10.0, 7.4 Hz, 4H), 2.18-2.04 (m, 1H), 1.99-1.84 (m, 1H), 1.71-1.52 (m, 4H), 1.49 (s, 9H), 1.46 (s, 9H), 1.37-1.29 (m, 20H).
Step C: (21S,26S)-21,26,42-tri-tert-butyl 1-methyl 9, 18,23, 28-tetraoxo-2, 5,11, 14-tetraoxa-
8,17, 22,27-tetraazadotetracontane-l,21,26,42-tetracarboxylate 4c To a stirred solution of (S)-5-(ter/-butoxy)-4-(16-(ter/-butoxy)-16-oxohexadecanamido)-5- oxopentanoic acid 4b (600 mg, 1.14 mmol) in DMF (6 mL) were added (S)-23-/er/-butyl 1 -methyl 22-amino-10,19-dioxo-3,6,12,15-tetraoxa-9,18-diazatricosane-l,23-dioate 3d’ (635 mg, 1.25 mmol, 3d’ prepared in the same way as 3d using (S)-4-(((benzyloxy)carbonyl)amino)-5-(tert-butoxy)-5- oxopentanoic acid (1.5 g, 4.45 mmol) in Step A of Example 3), HATU (476 mg, 1.25 mmol) and DIEA (1.19 mL, 6.82 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with water (2 mL) and purified by Flash (Column: Flash C18 120 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 80 mL/min; Gradient: 10% B to 70% B in 10 min, 70% B to 90% B in 20 min; Detector: UV 220 nm; Rt = 28 min) to afford (215,,26S)-21,26,42-tri-ter/-butyl 1-methyl 9,18,23,28-tetraoxo-2,5,l l,14-tetraoxa-8,17,22,27- tetraazadotetracontane-l,21,26,42-tetracarboxylate 4c. LCMS (ESI) calc’d for C51H92N4O16 [M + H]+: 1017.7, found 1017.6. ¾ NMR (300 MHz, CD3OD): d 4.31-4.23 (m, 2H), 4.18 (s, 2H), 4.02 (s,
2H), 3.74 (s, 3H), 3.73-3.63 (m, 8H), 3.62-3.53 (m, 4H), 3.48-3.36 (m, 4H), 2.43-2.06 (m, 11H), 1.97-1.79 (m, 1H), 1.70-1.52 (m, 4H), 1.51-1.42 (m, 27H), 1.37-1.28 (m, 20H).
Step D: ( 22S , 27S)-22, 27 -bis (tert-butoxycarbonyl)-46, 46-dimethyl- 10, 19,24,29, 44-pentaoxo-
3, 6,12,15, 45-pentaoxa-9, 18, 23 ,28-tetraazaheptatetracontan-l -oic acid 4d To a stirred solution of (215',265)-21,26,42-tri-ter/-butyl 1-methyl 9,18,23,28-tetraoxo-2,5,l 1,14- tetraoxa-8,17,22,27-tetraazadotetracontane-l,21,26,42-tetracarboxylate 4c (930 mg, 0.91 mmol) in THF (10 mL) was added 1 M LiOH (1.83 mL, 1.83 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with 1 M HC1 (1.83 mL) and purified by Flash (Column: Flash
120 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 70 mL/min; Gradient: 1% B to 75% B in 10 min, 75% B to 90% B in 20 min; Detector: UV 220 nm; Rt = 25 min) to afford ( 22. S’,27.S’)-22,27-bis(fc/7-butoxycarbonyl)-46,46-di methyl- 10, 19,24,29,44- pentaoxo-3,6,12,15,45-pentaoxa-9,18,23,28-tetraazaheptatetracontan-l-oic acid 4d. LCMS (ESI) calc’d for C50H90N4O16 [M + H]+: 1003.6, found 1003.5. ¾ NMR (400 MHz, CD3OD): d 4.29 (dt, J = 9.6, 4.7 Hz, 2H), 4.17 (S, 2H), 4.03 (s, 2H), 3.76-3.65 (m, 8H), 3.64-3.56 (m, 4H), 3.50-3.35 (m, 4H), 2.46-2.07 (m, 10H), 1.97-1.84 (m, 2H), 1.69-1.54 (m, 4H), 1.52-1.45 (m, 27H), 1.10-1.29 (m, 20H).
Step E: Synthesis of intermediate 4e
To a stirred solution of (22.S',27.S')-22,27-bis(fe/7-butoxycarbonyl)-46, 46-dimethyl- 10, 19,24,29,44- pentaoxo-3,6,12,15,45-pentaoxa-9,18,23,28-tetraazaheptatetracontan-l-oic acid 4d (200 mg, 0.20 mmol) in DMF (2 mL) and water (0.2 mL) were added 2-( 2-ami nocthoxy)-/V-( 2-(2-( 2-mcthoxy-2- oxoethoxy)ethoxy)ethyl)-V,V-dimethylethanaminium chloride hydrochloride M (146 mg, 0.40 mmol), HATU (91 mg, 0.24 mmol) and DIEA (0.21 mL, 1.20 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with water (2 mL) and purified by Flash (Column: Flash C^ 120 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 80 mL/min; Gradient: 10% B to 30% B in 10 min, 30% B to 70% B in 20 min; Detector: UV 220 nm; Rt = 25 min) to afford 4e. LCMS (ESI) calc’d for C65H117F3N6O22 [M - TFA ] : 1277.8, found 1277.8.
Step F: Synthesis of intermediate 4f
To a stirred solution of 4e (270 mg, 0.19 mmol) in THF (3 mL) was added 1 M LiOH (0.39 mL, 0.39 mmol) at 0 °C. The reaction mixture was stirred at 0 °C for 1 h. The resulting solution was quenched with 1 M HC1 (0.39 mL) and purified by Flash (Column: Flash C ^ 80 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 60 mL/min; Gradient: 1% B to 30% B in 10 min, 30% B to 60% B in 15 min; Detector: UV 220 nm; Rt = 23 min). The fractions containing desired product were
combined and concentrated. The residue was re-dissolved in ACN (3 mL) and water (5 mL), and added 1 N HC1 (0.15 mL) at 0 °C. The solution was lyophilized to afford 4f. LCMS (ESI) calc’d for C62H115CIN6O20 [M - Cl ]+: 1263.8, found 1263.7. ¾ NMR (400 MHz, CD3OD): d 4.30 (dt, J = 11.7, 5.4 Hz, 2H), 4.19-4.12 (m, 2H), 4.07-3.99 (m, 4H), 3.80-3.39 (m, 32H), 3.26 (s, 6H), 2.45-2.13 (m, 10H), 1.98-1.80 (m, 2H), 1.70-1.56 (m, 4H), 1.54-1.44 (m, 27H), 1.10-1.29 (m, 20H).
Step G: Synthesis of 4g
To a solution of D (15.0 mg, 10.7 pmol) in DMF (300 pF) and water (30 pF) was added 4f (19.6 mg, 0.015 mmol) at room temperature. After cooling to -20 °C, HATU (8.17 mg, 0.021 mmol) and DIEA (15 pL, 0.086 mmol) were added to the mixture at -20 °C. The mixture was stirred at 0 °C for 0.5 h. The reaction solution was quenched with water (100 pL) and purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 45 mF/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 254/210 nm; Rt = 20 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (5 mL) and water (5 mF), lyophilized to afford 4g. FCMS (ESI) calc’d for C136H202F4N20O33 [(M - TFA + H)/2]+: 1303.7, found 1303.3.
Step H: Synthesis of 4h
To a solution of 4g (25.0 mg, 9.19 pmol) in DCM (5 mF) was added TFA (6.2 mF, 80 mmol) at - 20 °C. The reaction mixture was stirred at room temperature for 1 h. The reaction solution was concentrated under reduced pressure and purified by Flash (Column: Flash C 18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 45 mF/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 254/210 nm; Rt = 16 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re dissolved in ACN (5 mF) and water (5 mF), lyophilized to afford 4h. FCMS (ESI) calc’d for C124H176F4N20O33 [(M - TFA + H)/2]+: 1218.6, found 1219.5.
Step I: Synthesis of Example 4
5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mF), followed by 20% ACN in water (2 x 10 mF). A solution of 4h (18.0 mg,
7.06 pmol) in 60% ACN in water (20 mF) was loaded onto the resin column, and the column was eluted with 60% ACN in water (4 x 20 mF). The eluents were combined, water (5 x 4 mF) added, lyophilized to afford Example 4. FCMS (ESI) calc’d for C122H176CIFN20O31 [M - Cl ]+: 2436.3, found 2436.3; [(M - CL+ H)/2]+: 1218.6, found 1219.2.
Preparation of Example 5
Step A: (S)-21 37-di-tert-butyl 1-methyl 9, 18,2 -trioxo-2, 5, 11, 14-tetraoxa-8, 17,22-triazaheptatriacontane- 1,21,37-tricarboxylate 5a
To a solution of (S)-23 -/«'/-butyl 1-methyl 22-amino-10,19-dioxo-3,6,12,15-tetraoxa-9,18-diazatricosane- 1,23-dioate 3d’ (510 mg, 1.005 mmol) in DMF (5 mL) were added 16-(/er/-butoxy)-16-oxohexadecanoic acid (344 mg, 1.005 mmol), HATU (382 mg, 1.005 mmol) and DIEA (0.526 mL, 3.01 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The reaction solution was quenched with water (1 mL) and purified by Flash (Column: Flash C18 80 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 60 mL/min; Gradient: 10% B to 10% B in 5 min, 35% B to 90% B in 25 min; Detector: UV 220 nm; Rt= 28 in) to afford the (S)-21 ,37-di-/«'/-butyl 1-methyl 9,18,23-trioxo-2,5,l l,14-tetraoxa-8,17,22- triazaheptatriacontane-l,21,37-tricarboxylate 5a. LCMS (ESI) calc’d for C42H77N3O13 [M + H]+: 832.6, found 832.6; 'H NMR (300 MHz, CDCb) 64.41 (td, /= 8.5, 4.1 Hz, 1H), 4.15 (s, 2H), 4.03 (s, 2H), 3.75 (s, 3H), 3.74-3.41 (m, 16H), 2.41-2.07 (m, 7H), 2.02-1.82 (m, 1H), 1.70-1.52 (m, 4H), 1.46 (s, 9H), 1.44 (s, 9H), 1.33- 1.22 (m, 20H).
Step B: (S)-22-(tert-butoxycarbonyl)-41 ,41 -dimethyl- 10, 19,24,39-tetraoxo-3 ,6, 12, 15,40-pentaoxa-9,18,23- triazadotetracontan- 1 -oic acid 5b
To a solution of (.5) -21 .37 -di -/«'/-butyl 1-methyl 9,18,23-trioxo-2,5,l l,14-tetraoxa-8,17,22- triazaheptatriacontane-l,21,37-tricarboxylate 5a (490 mg, 0.589 mmol) in THF (5 mL) was added 1 M lithium hydroxide (1.178 mL, 1.178 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The reaction solution was quenched with 1 M HC1 (1.2 mL) and purified by Flash (Column: Flash C18 80 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 60 mL/min; Gradient: 10% B to 10% B in 10 min, 30% B to 90% B in 25 min; Detector: UV 220 nm; Rt= 25 min). The fractions containing desired product were combined and concentrated. The residue was lyophilized to afford (S)-22-(/«'/-butoxycarbonyl)-41 .41 -dimethyl- 10. 19.24.39- tetraoxo-3,6,12,15,40-pentaoxa-9,18,23-triazadotetracontan-l-oic acid 5b. LCMS (ESI) calc’d for C41H75N3O13 [M + H]+: 818.5, found 818.6; *H NMR (300 MHz, CD3OD) 6 4.26 (dd, J= 9.0, 5.0 Hz, 1H), 4.13 (s, 2H), 4.01 (s, 2H), 3.80-3.53 (m, 12H), 3.51-3.36 (m, 4H), 2.43-2.14 (m, 6H), 2.16-2.05 (m, 1H), 1.91 (dq, J= 15.9, 8.0 Hz, 1H), 1.75-1.51 (m, 4H), 1.47 (s, 9H), 1.45 (s 9H), 1.32 (d, J= 8.7 Hz, 20H).
Step C: Synthesis of intermediate 5c
To a solution of (.S')-22-(te/7-butoxycarbonyl)-41 ,41 -dimethyl- 10, 19,24,39-tctraoxo-3,6, 12, 15,40- pentaoxa-9,18,23-triazadotetracontan-l-oic acid 5b (250 mg, 0.306 mmol) in DMF (2 mL) and water (0.2 mL) were added 2 - a m i n 0 - /V- ( 2 - ( 2 - ( 3 - m c th 0 x y- 3 - 0 x 0 p ro p ox y ) c th 0 x y ) c th yl ) - /V, /V- dimethylethanaminium chloride hydrochloride M (102 mg, 0.306 mmol), HATU (116 mg, 0.306 mmol) and DIEA (0.267 mL, 1.528 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The reaction solution was quenched with water (500 pL) and purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.05% TFA), Mobile Phase B: ACN; Flow rate: 45 mL/min; Gradient: 1% B to 1% B in 5 min, 30% B to 65% B in 20 min; Detector: UV 220 nm; Rt= 24 min). The fractions containing desired product were combined and concentrated. The residue was re-dissolved in ACN (10 mL) and water (10 mL) , and lyophilized to afford 5c. LCMS (ESI) calc’d for C55H100F3N5O18
[M - TFA ]+: 1062.7, found 1062.7. ¾ NMR (300 MHz, CD3OD) d 4.26 (dd, J = 9.1, 5.2 Hz, 1H), 4.04 (s, 2H), 4.01 (s, 2H), 3.96 (s, 2H), 3.81-3.52 (m, 27H), 3.47 (t, J = 5.6 Hz, 2H), 3.39 (t, J = 5.6 Hz, 2H), 3.23 (s, 6H), 2.60 (t, J = 6.0 Hz, 2H), 2.26 (dt, J = 25.1, 7.5 Hz, 6H), 2.10 (dt, J = 13.3, 7.1 Hz, 1H), 2.00-1.83 (m, 1H), 1.71-1.51 (m, 4H), 1.47 (s, 9H), 1.45 (s, 9H), 1.41-1.22 (d , J = 10.5 Hz, 20H).
Step D: Synthesis of intermediate 5d
To a solution of 5c (240 mg, 0.204 mmol) in THF (2.5 mL) was added 1 M LiOH (0.408 mL, 0.408 mmol) at 0 °C. The mixture was stirred at 0 °C for 1 h. The reaction solution was quenched with 1 M HC1 (0.41 mL) and purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water, Mobile Phase B: ACN; Flow rate: 45 mL/min; Gradient: 1% B to 1% B in 5 min, 35% B to 70% B in 20 min; Detector: UV 220 nm; Rt= 24 min). The fractions containing desired product were combined and concentrated. The residue was re-dissolved in ACN (5 mL) and water (5 mL) , and added 1 N HC1 (0.22 mL) at 0 °C and lyophilized to afford 5d. LCMS (ESI) calc’d for C^ILA'INT),,, [M - Cl f: 1048.7, found 1048.7. ‘H NMR (300 MHz, CD3OD): d 4.26 (dd, J = 9.1, 5.1 Hz, 1H), 4.05 (s, 2H), 4.02 (s, 2H), 3.96 (s, 2H), 3.83-3.51 (m, 24H), 3.47 (t, 7 = 5.5 Hz, 2H), 3.39 (t, 7 = 5.6 Hz, 3H), 3.22 (s, 6H), 2.42 (t, J= 6.1 Hz, 2H), 2.30 (t, J= 7.9 Hz, 2H), 2.21 (t, J= 7.6 Hz, 4H), 2.18-2.02 (m, 1H), 1.91 (dd, J= 14.2, 8.5 Hz, 1H), 1.59 (dd, J= 15.7, 8.0 Hz, 5H), 1.47 (s, 9H), 1.45 (s, 9H), 1.31 (s, 20H).
Step E: Synthesis of 5e
To a solution of D (20 mg, 0.014 mmol) in DMF (200 pL) and water (20 m L) were added 5d (21.76 mg, 0.020 mmol), HATU (10.9 mg, 0.029 mmol) and DIEA (14.8 mg, 0.115 mmol) at -20 °C. The mixture was stirred at -20 °C for 0.5 h. The reaction solution was quenched with water (50 m L) and purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 45 mL/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 15 min; Detector: LTV 220 nm; Rt= 13 min) to afford 5e. LCMS (ESI) calc’d for C126H183F4N19O29 [(M - TFAV2)]+: 1194.7, found 1195.9.
Step F: Synthesis of 5f
To a solution of 5e (27 mg, 10.78 mitioI) in DCM (10 mL) was added TFA (12.5 mL) at -10 °C. The mixture was stirred at RT for 3 h. The resulting mixture was concentrated under reduced pressure and the residue was and purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 15 min; Detector: LTV 220 nm; Rt= 12 min) to 5f LCMS (ESI) calc’d for C, ikHkM iN,TT· [(M - TFAV2)]+: 1138.6, found 1140.0.
Step G: Synthesis of Example 5
6 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mL), followed by 20% ACN in water (2 x 10 mL). A solution of 5f (18 mg, 7.53 LllTlol) in 65% ACN in water (2 mL x 2) was loaded onto the resin column, then the column was eluted with 65% ACN in water (80 mL). The eluents were combined and lyophilized to give Example 5. LCMS (ESI) calc’d for
Cii6Hi67ClFNi9027 [M - erf: 2277.2, found 2277.2.
Preparation of Example 6
Step A - Synthesis of intermediate 6a
To 2-chlorotrityl chloride resin (0.5 g, about 1 mmol/g) was added dry DCM (3 mL) and the resin was allowed to stand at RT for 20 min. A solution of 17-(9-fh orenylmethyloxycarbonyl-amino)-9-aza-3,6,12,15- tetraoxa-10-on-heptadecanoic acid, CAS 560088-89-3 (332 mg, 0.625 mmol) and DIPEA (0.109 mL, 0.625 mmol) in DCM (1.5 mL) was added slowly, followed by more DIPEA (0.25 mL). The resin was shaken at RT for 2 h then filtered and rinsed with DCM three times. The resin was then quenched with 5% DIPEA and 10% MeOH in DCM (5 mL) and shaken for 2 h at RT. The resin was filtered, rinsed with DCM three times, DMF three times, DCM three times then dried under vacuum to give resin 6a.
Step B - Synthesis of intermediate 6b
Resin 6a, from step A, was treated with 20% piperidine in DMF (4 mL), shaken for 30 min at RT, filtered and rinsed with DMF three times, DCM three times, and DMF three times. The resin was then treated with a solution of Fmoc-L-Glu-OtBu (0.851 g, 2.00 mmol), HATU (0.760 g, 2.00 mmol) and DIPEA (0.699 mL,
4.00 mmol) in DMF (5 mL) and shaken for 75 min at RT. The resin was filtered and rinsed with DMF three times, DCM three times, and DMF three times to afford resin S-2 which was used as is in the next step.
Step C - Synthesis of intermediate 6c
Resin 6b, from Step B, was treated with 20% piperidine in DMF (4 mL), shaken for 30 min at RT, filtered and rinsed with DMF three times, DCM three times, and DMF three times. The resin was then treated with a solution of Fmoc-L-Glu-OtBu (0.851 g, 2.00 mmol), HATU (0.760 g, 2.00 mmol) and DIPEA (0.699 mL,
4.00 mmol) in DMF (5 mL) and shaken for 75 min at RT. The resin was filtered and rinsed with DMF three times, DCM three times, DMF three times, and DCM three times to afford resin 6c.
Step D - Synthesis of intermediate 6d
Resin 6c, from Step C, was treated with 25% hexafluoroisopropanol in DCM (5 mL), shaken for 75 min at RT then filtered. The filtrate was concentrated under vacuum to provide intermediate 6d. LC/MS: [M+H]+ = 901.0. 'HNMR (400 MHz, DMSO-de): d 8.14 (m, 1H), 7.90 (m, 2H), 7.70-7.75 (m, 2H), 7.64 (m, 1H), 7.40- 7.45 (m, 2H), 7.30-7.35 (m, 2H), 4.32 (m, 1H), 4.20-4.28 (m, 2H), 4.05 (m, 1H), 3.99 (s, 2H), 3.90 (m, 1H), 3.98 (s, 2H), 3.50-3.60 (m, 6H), 3.37-3.45 (m, 4H), 3.24-3.35 (m, 6H), 3.17-3.22 (m, 2H), 2.22 (m, 2H), 2.15 (m, 2H), 1.85-1.98 (m, 2H), 1.70-1.82 (m, 2H), 1.39 (s, 18H).
Step E - Synthesis of intermediate 6e
To a solution of intermediate 6d (300 mg, 0.333 mmol) and intermediate M (169 mg, 0.400 mmol) in DMF (4 ml) at RT were added HATU (146 mg, 0.383 mmol) and DIEA (0.465 ml, 2.66 mmol) and the solution was stirred at RT for 2h. The final mixture was purified by reverse phase MPLC over Cl 8 (eluting with a gradient of acetonitrile (+0.05% TFA) in water (+0.05%TFA)) to give 6e. LC/MS: [M]+ = 1145.4.
Step B - Synthesis of intermediate 6f
To a solution of 6e (327 mg, 0.285 mmol) in acetonitrile (5 ml) was added piperidine (0.085 ml, 0.856 mmol) and the solution was stirred at RT for 3 h. The final mixture was concentrated, the residue was dissolved in acetonitrile/water 2:1 (20 mL) then lyophilized to give 6f. LC/MS: [M]+ = 923.3.
Step C - Synthesis of intermediate 6g
To a solution of 6f (132 mg, 0.143 mmol) in DMF (4 ml) were added 18-(tert-butoxy)-18-oxooctadecanoic acid (74.1 mg, 0.200 mmol), HATU (76 mg, 0.200 mmol), and DIEA (0.100 ml, 0.571 mmol) and the solution was stirred at RT for 1 h. The final mixture was purified by reverse phase MPLC over Cl 8 (eluting with a gradient of acetonitrile (+0.05% TFA) in water (+0.05%TFA)) to give 6g. LC/MS: [M]+ = 1275.6.
Step D - Synthesis of intermediate 6h
To a solution of 6g (161 mg, 0.117 mmol) in THF (2.5 ml) at 0 °C was added LiOH (0.135 ml, 0.135 mmol) then the solution was stirred at RT for 2 h. The final mixture was quenched at 0 °C with 1 N HC1 (100 uL), concentrated and the residue was purified by reverse phase MPLC over Cl 8 (eluting with a gradient of acetonitrile (+0.05% TFA) in water (+0.05%TFA)) to provide 6h. LC/MS: [M]+ = 1261.5. ' H NMR (500 MHZ,CD3OD): d 4.29-4.23 (m, 2H), 4.05 (s, 2H), 4.01 (s, 2H), 3.98-3.93 (m, 2H), 3.78-3.53 (m, 24H), 3.46 (t, J = 5.6 Hz, 2H), 3.39 (td, J = 5.6, 4.0 Hz, 2H), 3.21 (s, 6H), 2.40 (t, J = 6.1 Hz, 2H), 2.37-2.09 (m, 10H), 1.93- 1.82 (m, 2H), 1.68-1.51 (m, 4H), 1.469 (s, 9H), 1.467 (s, 9H), 1.44 (s, 9H), 1.36-1.26 (m, 24H).
Step I: Synthesis of 6i
To a solution of D (20.0 mg, 0.014 mmol) in DMF (200 pL) and water (20 pL) was added 6h (26.5 mg, 0.020 mmol) at room temperature. After cooling to -20 °C, HATU (10.9 mg, 0.029 mmol) and DIEA (20 pL, 0.115 mmol) were added to the mixture. The mixture was stirred at 0 °C for 0.5 h. The reaction solution was quenched with water (100 pL) and purified by Flash (Column: Flash C1840 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 45 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 80% B in 30 min; Detector: UV 254/210 nm; Rt = 30 min). The fractions containing desired product were combined and
concentrated under reduced pressure. The residue was re -dissolved in ACN (5 mL) and water (5 mL), lyophilized to afford 6i. LCMS (ESI) calc’d for C137H202F4N20O32 [(M - TFA + H)/2]+: 1301.8, found 1302.8. Step J: Synthesis of 6j
To a solution of 6i (26.0 mg, 9.57 mitioI) in DCM (5.2 mL) was added TFA (6.5 mL, 84 mmol) at -20 °C. The reaction mixture was stirred at room temperature for 1 h. The reaction solution was concentrated under reduced pressure and purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0. 1% TFA), Mobile Phase B: ACN; Flow rate: 45 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 254/210 nm; Rt = 18 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re -dissolved in ACN (5 mL) and water (5 mL), lyophilized to afford 6j. LCMS (ESI) calc’d for C125H178F4N20O32 [(M - TFA + H)/2]+: 1217.7, found 1218.6.
Step K: Synthesis of Example 6
5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 10 mL), followed by 20% ACN in water (2 x 10 mL). A solution of 6j (18.0 mg, 7.06 mitioI) in 60% ACN in water (20 mL) was loaded onto the resin column, and the column was eluted with 60% ACN in water (4 x 20 mL). The eluents were combined, water (5 x 4 mL) added, lyophilized to afford Example 6. LCMS (ESI) calc’d for CmHnsClFNzoCbo [M - CF]+: 2434.3, found 2434.3; [(M - Cl + H)/2]+: 1217.7, found 1218.2. Preparation of Example 7
Step A: Synthesis of 7a
To a solution of J (14.5 mg, 7.44 mihoΐ) in DMF (200 pL) and water (20 pL) were added (S)-22-(lerl- butoxycarbonyl)-43 ,43 -dimethyl- 10,19,24,41 -tetraoxo-3 ,6, 12, 15,42-pentaoxa-9, 18,23 -triazatetratetracontan- 1-oic acid If (8.82 mg, 10.4 mihoΐ), HATU (5.66 mg, 0.015 mmol) and DIEA (10.4 mT, 0.060 mmol) at - 20 °C. The mixture was stirred at 0 °C for 0.5 h. The reaction solution was quenched with water (100 mT) and purified Flash (Column: Flash C1840 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2% B to 2% B in 5 min, 40% B to 80% B in 20 min; Detector: UV 254/210 nm; Rt = 20 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (5 mL) and water (5 mL), lyophilized to afford 7a. LCMS (ESI) calc’d for C134H193F4N21O33 [(M - TFA + H)/2]+: 1274.2, found 1275.1 .
Step B: Synthesis of 7b
To a solution of 7a (13.0 mg, 4.81 pmol) in DCM (2.6 mL) was added TFA (3.2 mL, 41.5 mmol) at -20 °C. The reaction mixture was stirred at room temperature for 1 h. The resulting solution was concentrated under reduced pressure and the residue was purified by Flash (Column: Flash C1840 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 50% B in 20 min; Detector: UV 254/210 nm; Rt = 18 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (5 mL) and water (5 mL), and lyophilized to afford 7b. LCMS (ESI) calc’d for C125H181F4N21O31 [(M - TFA + H)/2]+: 1218.2, found 1219.1.
Step C: Synthesis of Example 7
5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mL), followed by 20% ACN in water (2 x 10 mL). A solution of 7b (11 mg, 4.31 pmol) in 50% ACN in water (20 mL) was loaded onto the resin column, and the column was eluted with 50% ACN in water (4 x 20 mL). The eluents were combined and lyophilized to afford Example 7. LCMS (ESI) calc’d for C123H181CIFN21O29 [M - Clf: 2435.3, found 2435.3; [(M - Cl + H)/2]+: 1218.2, found 1218.7.
Step A: Synthesis of 8a
To a solution of I (15.0 mg, 7.70 mihoΐ) in DMF (200 pL) and water (20 pL) were added ( S)-22-(tert - butoxycarbonyl)-43 ,43 -dimethyl- 10,19,24,41 -tetraoxo-3 ,6, 12, 15,42-pentaoxa-9, 18,23 -triazatetratetracontan- 1-oic acid If (9.12 mg, 10.78 mihoΐ), HATU (5.86 mg, 0.015 mmol) and DIEA (10.8 mT, 0.062 mmol) at - 20 °C. The mixture was stirred at 0 °C for 0.5 h. The reaction solution was quenched with water (50 mT) and purified Flash (Column: Flash C1840 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2% B to 2% B in 5 min, 30% B to 70% B in 20 min; Detector: UV 254/210 nm; Rt = 22 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (5 mL) and water (5 mL), lyophilized to afford 8a. LCMS (ESI) calc’d for C133H197F4N21O31 [(M - TFA + H)/2]+: 1274.2, found 1275.0.
Step B: Synthesis of 8b
To a solution of 8b (10.0 mg, 3.76 pmol) in DCM (1.4 mL) was added TFA (1.7 mL, 22.1 mmol) at -20 °C. The reaction mixture was stirred at room temperature for 1 h. The resulting solution was concentrated under reduced pressure and the residue was purified by Flash (Column: Flash C1820 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 30 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 50% B in 15 min; Detector: UV 254/210 nm; Rt = 18 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (3 mL) and water (3 mL), and lyophilized to 8b. LCMS (ESI) calc’d for C125H181F4N21O31 [(M - TFA + H)/2]+: 1218.2, found 1218.7.
Step C: Synthesis of Example 8
5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with
water (2 x 10 mL), followed by 20% ACN in water (2 10 mL). A solution of 8b (9 mg, 3.53 mihoΐ) in 50% ACN in water (20 mL) was loaded onto the resin column, and the column was eluted with 50% ACN in water (4 x 20 mL). The eluents were combined and lyophilized to afford 6.9 mg Example 8. LCMS (ESI) calc’d for C123H181CIF 21O29 [M - Cl†: 2435.3, found 2435.3; [(M - CL + H)/2]+: 1218.2, found 1218.8.
Step A: Synthesis of 9a
To a solution of I (20.0 mg, 10.27 mitioI) in DMF (200 mί.) and water (20 mί.) were added (255,30S)-25, 30- bi s( fe/V-butoxycarbonyl )-/V-(2-( 2-(2-carboxycthoxy )ctlioxy)ctliy I )-/V./V.51,51 -tetramethyl-4, 13, 22, 27, 32,49- hexaoxo-6,9, 15,18,50-pentaoxa-3, 12,21 ,26,31 -pentaazadopentacontan-1 -aminium hydrogencarbonate 6h (19.0 mg, 0.014 mmol), HATU (7.81 mg, 0.021 mmol) and DIEA (14.3 pL, 0.082 mmol) at -20 °C. The mixture was stirred at 0 °C for 0.5 h. The reaction solution was quenched with water (50 mί.) and purified Flash (Column: Flash C18 40 g; Mobile Phase A: water (0. 1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 60% B in 20 min; Detector: UV 254/210 nm; Rt = 23 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re -dissolved in ACN (5 mL) and water (5 mL), lyophilized to afford 9a. LCMS (ESI) calc’d for C155H235F7N24O39 [(M - 2TFA )/2]+: 1481.9, found 1482.4.
Step B: Synthesis of 9b
To a solution of 9a (22.0 mg, 6.89 mpioI) in DCM (4.4 mL) was added TFA (5.5 mL, 71.4 mmol) at -20 °C. The reaction mixture was stirred at room temperature for 1 h. The resulting solution was concentrated under reduced pressure and the residue was purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2% B to 2% B in 5 min, 20% B to 50% B in 15 min; Detector: UV 254/210 nm; Rt = 18 min). The fractions containing desired product were combined and concentrated under reduced pressure. The residue was re-dissolved in ACN (5 mL) and water (5
mL), and lyophilized to afford 9b. LCMS (ESI) calc’d for C143H211F7N24O39 [(M - 2TFA )/2]+: 1397.8, found 1398.3.
Step C: Synthesis of Example 9
5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mL), followed by 20% ACN in water (2 10 mL). A solution of 9b (16 mg, 5.29 pmol) in 50% ACN in water (20 mL) was loaded onto the resin column, and the column was eluted with 50% ACN in water (4 x 20 mL). The eluents were combined and lyophilized to afford Example 9. LCMS (ESI) calc’d for C139H211CI2FN24O35 [M - Clf: 2794.5, found 2794.5; [(M - Cl + H)/2]+: 1397.8, found 1398.5.
Step A: Synthesis of 10a
To a solution of L (20.0 mg, 0.014 mmol) in DMF (200 pL) and water (20 pL) were added (255,,30S)-25,30-bis(ter/-butoxycarbonyl)-A-(2-(2-(2-carboxyethoxy)ethoxy)ethyl)-A,A^,51,51- tetramethyl-4,13,22,27,32,49-hexaoxo-6,9, 15,18,50-pentaoxa-3,12,21,26,31-pentaazadopenta contan-1 -aminium hydrogencarbonate 6h (26.4 mg, 0.020 mmol), HATU (10.8 mg, 0.028 mmol) and DIEA (14.7 mg, 0.114 mmol) at -10 °C. The reaction mixture was stirred at -10 °C for 0.5 h. The resulting solution was quenched with water (50 pL) and purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 15 min; Detector: UV 220 nm; Rt — 18 min) to afford 10a. LCMS (ESI) calc’d for Ci37H206F4Ni8O34 [(M - TFAY2)]+: 1305.3, found 1306.7.
Step B: Synthesis of 10b
To a solution of 10a (28.0 mg, 10.27 pmol) in DCM (10 mL) was added TFA (12.5 mL) at -10 °C. The mixture was stirred at room temperature for 3 h. The resulting mixture was concentrated under reduced pressure and the residue was and purified by Flash (Column: Flash C18 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mL/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 15 min; Detector: UV 220 nm; Rt = 12 min) to afford 10b. LCMS (ESI) calc’d for Ci25Hi82F4Ni8034 [(M - TFAV2)]+: 1221.2, found 1222.2.
Step C: Synthesis of Example 10
6 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mL), followed by 20% ACN in water (2 x 10 mL). A solution of 10b (17 mg, 6.65 pmol) in 65% ACN in water (2 mL x 2) was loaded onto the resin column, the column was eluted with 65% ACN in water (80 mL). The eluents were combined and lyophilized to give Example 10. LCMS (ESI) calc’d for C123H182CIFN18O32 [M - CF]+: 2442.3, found 2442.3.
Step A: Synthesis of 11a
To a solution of L (20.0 mg, 0.014 mmol) in DMF (200 pL) and water (20 pL) were added (S)-25-
(ter/-butoxycarbonyl)-A-(2-(2-(2-carboxyethoxy)ethoxy)ethyl)-A,A,44,44-tetramethyl-
4, 13,22,27,42-pentaoxo-6,9, 15,18,43-pentaoxa-3, 12,21 ,26-tetraazapentatetracontan- 1 -aminium
chloride 5d (21.6 mg, 0.020 mmol), HATU (10.8 mg, 0.028 mmol) and DIEA (18.8 gF, 0.114 mmol) at -10 °C. The reaction mixture was stirred at 0 °C for 0.5 h. The resulting solution was quenched with water (200 gF) and purified by Flash with the following condition: Column: Flash Cl8 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mF/min; Gradient: 2% B to 2% B in 5 min, 30% B to 65% B in 20 min; Detector: FTV 210 nm; Rt = 25 min to afford 11a. FCMS (ESI) calc’d for C126H187F4N17O31 [(M - TFAV2)]+: 1199.5, found 1200.0.
Step B: Synthesis of lib
To a solution of 11a (27.0 mg, 10.75 gmol) in DCM (10 mL) was added TFA (12.5 mL) at -10 °C. The reaction mixture was stirred at room temperature for 3 h. The reaction solution was concentrated under reduced pressure and purified by Flash: Column: Flash C^ 40 g; Mobile Phase A: water
(0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mF/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 20 min; Detector: UV 210 nm; Rt = 25 min to afford lib. FCMS (ESI) calc’d for C118H171F4N17O31 [(M - TFA /2)]+: 1143.1, found 1143.7.
Step C: Synthesis of Example 11 5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mF), followed by 20% ACN in water (2 x 10 mF). A solution of lib (17 mg, 7.08 gmol) in 60% ACN in water (20 mF) was loaded onto the resin column, then the column was eluted with 60% ACN in water (4 x 20 mF). The eluents were combined, water (5 x 4 mF) added, lyophilized to afford Example 11. FCMS (ESI) calc’d for C116H171CIFN17O29 [ M - Cl ]+ : 2285.2, found 2285.2;
Preparation of Example 12
Step A: (S)-5-( tert-butoxycarbonyl)-3, 8, 17 -trioxo-l -phenyl-2, 12,15, 21 ,24-pentaoxa-4, 9,18- triazahexacosan-26-oic acid 12a
To a solution of (S)-23-fer/-butyl 1-methyl 22-(((benzyloxy)carbonyl)amino)-10,19-dioxo-3,6,12,15- tetraoxa-9,18-diazatricosane-l,23-dioate lc (2.00 g, 3.12 mmol) in THF (20 mL) was added 2 M LiOH (3.12 mL, 6.23 mmol) at 0 °C. The mixture was stirred at 0 °C for 2 h. The reaction solution
was quenched with 1 M HC1 (6.3 mL) and purified by Flash (Column: Flash C18 120 g; Mobile Phase A: water, Mobile Phase B: Water; Flow rate: 60 mL/min; Gradient: 10% B to 10% B in 10 min, 35% B to 80% B in 20 min; Detector: UV 220 nm; RT = 26 min). The fractions containing desired product were combined and concentrated. The residue was lyophilized to afford (S)-5-(tert- butoxycarbonyl)-3,8, 17-trioxo- 1 -phenyl-2, 12,15,21 ,24-pentaoxa-4,9, 18-triazahexacosan-26-oic acid 12a. LCMS (ESI) calc’d for C29H45N3O12 [M + H]+: 628.3, found 628.3. ¾ NMR (400 MHz, CDCb): d 7.47-7.31 (m, 5H), 5.11 (s, 2H), 4.22 (br, 1H), 4.16 (s, 2H), 4.03 (s, 2H), 3.66 (tt, .7= 25.7, 4.5 Hz, 12H), 3.56- 3.39 (m, 4H), 2.41-2.25 (m, 2H), 2.20 (dt, J= 12.2, 5.8 Hz, 1H), 1.97 (dq, J= 15.0, 7.7 Hz, 1H), 1.54-1.39 (m, 9H).
Step B: (S)-5-(tert-butoxycarbonyl)-N-(2-(2-(3-methoxy-3-oxopropoxy)ethoxy)ethyl)-N,N-dimethyl- 3, 8,17,26-tetraoxo- 1 -phenyl-2, 12,15,21,24-pentaoxa- 4, 9,18,27- tetraazanonacosan-29-aminium 2,2,2-trifluoroacetate 12b
To a mixture of (S)-5-(fc/7-butoxycarbonyl)-3,8, 17-trioxo- 1 -phenyl-2, 12, 15,21 ,24-pentaoxa-4,9, 18- triazahexacosan-26-oic acid 12a (200 mg, 0.319 mmol), HATU (145 mg, 0.382 mmol) and DIEA (247 mg, 1.912 mmol) in DMF (1 mL) was added a solution of 2-amino-V-(2-(2-(3-methoxy-3- oxopropoxy)ethoxy)ethyl)-V,V-dimethylethanaminium chloride hydrochloride M (214 mg, 0.637 mmol) in DMF (1 mL) and water (0.2 mL) at -10 °C. The resulting mixture was stirred at -10 °C for 30 min. The reaction mixture was quenched by water (2 mL) and purified by RP Flash (Column: Flash Cl» 330 g; mobile phase: ACN in water (0.1% TFA) , 30%-70% in 20 min; Detector, UV 210 nm. RT: 12 min). The collected fractions were combined and concentrated under reduced pressure to give (.S')-5-(te/7-butoxycarbonyl)-/V-(2-(2-( 3 -mcthoxy-3-oxopiOpoxy)cthoxy)cthyl)-/V,/V-di methyl-
3.8.17.26-tetraoxo- 1 -phenyl-2, 12, 15,21 ,24-pentaoxa-4,9, 18,27-tetraazanonacosan-29-aminium 2,2,2- trifluoroacetate 12b. LCMS (ESI) calc’d for C43H70F3N5O17 [M - TFA ]+: 873.0, found 873.0.
Step C: (S)-25-amino-N-(2-(2-(3-methoxy-3-oxopropoxy)ethoxy)ethyl)-N,N,28,28-tetramethyl-
4.13.22.26-tetraoxo-6, 9,15,18,27-pentaoxa-3, 12,21-triazanonacosan- 1 -aminium 2,2,2- trifluoroacetate 12c
To a solution of (.S')-5-(te/7-butoxycarbonyl)-/V-(2-(2-(3-mcthoxy-3-oxopiOpoxy)cthoxy)cthyl)-/V,/V- dimethyl-3, 8,17,26-tetraoxo- 1 -phenyl-2, 12, 15,21, 24-pentaoxa-4, 9,18, 27-tetraazanonacosan-29- aminium 2,2,2-trifluoroacetate 12b (160 mg, 0.162 mmol) in THF (5 mL) was added Pd/C (dry, 10% wt) (34.5 mg, 0.032 mmol) under nitrogen atmosphere. The mixture was degassed with hydrogen for three times and stirred at room temperature for 2 h under hydrogen. The resulting mixture was filtered and the filtrate was concentrated under reduced pressure to afford (S)-25-amino-V-(2-(2-(3- methoxy-3-oxopropoxy)ethoxy)ethyl)-V,V,28,28-tetramethyl-4,13,22,26-tetraoxo-6,9,15,18,27-
pentaoxa-3,12,21-triazanonacosan-l-aminium 2,2,2-trifluoroacetate 12c. LCMS (ESI) calc’d for C35H64F3N5O15 [M - TFA ]+: 738.5, found 738.5.
Step D: Synthesis of 12d
To a mixture of (.S')-5-(fe/V-butoxy)-4-( 16-(tcrt-butoxy)- 16-oxohcxadccanamido)-5-oxopcntanoic acid 4b (76 mg, 0.145 mmol), HATU (66.0 mg, 0.174 mmol) and DIEA (112 mg, 0.868 mmol) in DMF (0.7 mF) was added a solution of 12c (140 mg, 0.145 mmol) in DMF (0.7 mF) and water (0.14 mF) at -10 °C. The resulting mixture was stirred for 30 min at -10 °C. The reaction mixture was quenched by water (2 mF) and purified by RP Flash (Column: Flash
120 g; mobile phase: ACN in water (0.1% TFA) , 30%-80% in 20 min; Detector, FTV 210 nm. RT: 14 min). The collected fractions were combined and concentrated under reduced pressure to give 12d. FCMS (ESI) calc’d for C64H115F3N6O21 [M - TFA ]+: 1247.8, found 1248.1.
Step E: Synthesis of 12e
To a mixture of 12d (140 mg, 0.103 mmol) in THF (3 mF) was added 1 M FiOH (0.206 mF, 0.206 mmol) at 0 °C. The resulting mixture was stirred for 1 h at 0 °C. The reaction mixture was quenched by 1 M HC1 (0.2 mF) and purified by RP Flash (Column: Flash C18 120; mobile phase: ACN in water (0.1% NH4HCO3) , 30%-80% in 20 min; Detector, FTV 210 nm. RT: 15 min). The collected fractions were combined and concentrated under reduced pressure to give 12e. FCMS (ESI) calc’d for C62H114N6O22 [M - HC03 ]+: 1233.8, found 1234.1. 1H NMR (400 MHz, CD3OD): d 4.33-4.23 (m, 2H), 4.05 (d, J = 15.2 Hz, 4H), 3.82-3.54 (m, 24H), 3.53-3.35 (m, 6H), 3.24 (s, 6H), 2.50-2.11 (m, 12H), 1.97-1.82 (m, 2H), 1.69-1.54 (m, 4H), 1.53-1.41 (m, 27H), 1.38-1.28 (m, 20H).
Step F: Synthesis of 12f
To a stirred solution of L (20 mg, 0.014 mmol) in DMF (0.2 mF) and water (0.02 mF) were added (25.S',30.S')-25,30-bis(te/t-butoxycarbonyl)-/V-(2-(2-(2-carboxycthoxy)cthoxy)cthyl)-/V,/V,49,49- tetramethyl-4, 13,22,27,32,47-hexaoxo-6,9, 15,18,48-pentaoxa-3, 12,21 ,26,31 -pentaazapentacontan- 1 - aminium hydrogencarbonate 12e (25.8 mg, 0.020 mmol), HATU (10.83 mg, 0.028 mmol) and DIEA (14.73 mg, 0.114 mmol) at -10 °C. The resulting mixture was stirred at -10 °C for 30 min. The reaction mixture was quenched by water (1 mF) and purified by RP Flash (Column: Flash C^ 40 g; mobile phase: ACN in water (0.1% TFA) , 30%-70% in 25 min; Detector, UV 210 nm. RT: 15 min). The collected fractions were combined and concentrated under reduced pressure to give 12f. FCMS (ESI) calc’d for Ci35H202F4Ni8O34 [(M - TFA )/2]+: 1291.2, found 1292.7.
Step G: Synthesis of 12g
To a stirred solution of 12f (26 mg, 9.64 pmol) in DCM (5 mF) was added TFA (6.25 mF) at -10 °C. The resulting mixture was stirred at room temperature for 3 h. The reaction mixture was concentrated
under reduced pressure and the residue was purified by RP Flash (Column: Flash
40 g; mobile phase: acetonitrile in water (0.1% TFA) , 30%-50% in 15 min; Detector, UV 210 nm. RT: 10 min). The collected fractions were combined and concentrated under reduced pressure to give 12g. LCMS (ESI) calc’d for ^HpίTtNi^ [(M - TFA )/2]+: 1207.1, found 1208.5.
Step H: Synthesis of Example 12
5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (2 x 10 mL), followed by 20% ACN in water (2 10 mL). A solution of 12g (18 mg, 7.12 pmol) in ACN and water (3 :2, 20 mL) was loaded onto the resin column, then the column was eluted with 60% ACN in water (4 x 20 mL). The eluents were combined and lyophilized to afford Example 12. LCMS (ESI) calc’d for C HnsClFNisCte [M - Cf]+: 2415.8, found 2415.3. Preparation of Example 13
Step A: Synthesis of 13a
To a solution of 5d (55.3 mg, 0.051 mmol) in acetonitrile (1 ml) and DMF (0.15 ml) were added D (55 mg, 0.039 mmol), HATU (17.15 mg, 0.045 mmol) and DIPEA (0.041 ml, 0.235 mmol), then the mixture was stirred for 30 min. The mixture was slowly dripped into a centrifuge tube filled with IPAc/cyclopentylmethyl ether 1:1 (30 ml) and the tube was completed to 35 ml. The tube was chilled at -78 C for 2 min then centrifuged at -10 C for 20 min. The solvent was decanted, IPAc/cyclopentylmethyl ether 1:1 (30 ml) was added, the tube shaken, chilled at -78 C for 2 min then
centrifuged at - 10 °C for 20 min. The solvent was decanted and the solid concentrated out of toluene/acetonitrile then DCM to provide 13a. LCMS (ESI) calc’d for C125H189FN17O28CI [(M - Cl /2)]+: 1198.5, found 1198.5.
Step B: Synthesis of 13b
To a solution of 13a (73.5 mg, 30 pmol) in DCM (2 mL) was added TFA (1.8 mF) at -10 °C. The reaction mixture was stirred at room temperature for 3 h. The reaction solution was concentrated under reduced pressure and purified by Flash: Column: Flash C^ 40 g; Mobile Phase A: water (0.1% TFA), Mobile Phase B: ACN; Flow rate: 50 mF/min; Gradient: 2% B to 2% B in 5 min, 30% B to 60% B in 20 min; Detector: UV 210 nm; Rt = 25 min to afford 13b. FCMS (ESI) calc’d for C119H173F4N17O30 [(M - TFA /2)]+: 1142.3, found 1142.6.
Step C: Synthesis of Example 13
5 g of AG MP-1 Resin (cat # 141-1841 BIO-RAD) was packed in column. The column was washed with water (3 x 20 mF), followed by 20% ACN in water (3 x 20 mF). A solution of 13b (30 mg, 13 pmol) in 60% ACN in water (20 mF) was loaded onto the resin column, then the column was eluted with 60% ACN in water (4 x 20 mF). The eluents were combined, water (5 x 4 mF) added, lyophilized to afford Example 13. FCMS (ESI) calc’d for C117H173CIFN17O28 [ M - Cl /2]+ : 1142.5, found 1142.5;
ACTIVITY DETERMINATION
Selected compounds of the invention were subjected to one or more of the following procedures to assay their activity for antagonism of PCSK9 activity.
The following is a description of the assays used to determine activity of compounds of the invention, and any comparator compounds reported, toward PCSK9 antagonism. Biotinylated PCSK9 was obtained commercially.
Alexa FRET Standard TR-FRET
The PCSK9 Alexa FRET Standard assay measures the interaction between PCSK9 and an AlexaFluor647 (AF) tagged cyclic peptide, Reagent A (KD = 83nM). A solution containing 1 nM biotinylated PCSK9 + 2.5 nM Fance Streptavidin Europium (Strep-Eu) is made in 50 mM HEPES pH 7.4, 0.15 M NaCl, 5 mM CaC12, 0.01% BSA, and 0.01% Surfactant P20. A separate solution containing 40 nM of the AlexaFluor tagged cyclic peptide is made in the same buffer system. An Echo is used to transfer 0.750ul of compound to an assay plate followed by the addition of 15ul of PCSK9+Stept-Eu and 15ul of AF peptide. The final assay volume is 30.750ul containing 0.5nM
PCSK9, 1.25nM Strep-Eu, and 20nM AF cyclic peptide. The reaction is incubated at room temperature for at least two hours prior to fluorescence measurements using an Envision Multilabel Reader. IC50 values are determined by fitting data to a sigmoidal dose-response curve using nonlinear regression. Ki is then calculated from the Ic50 and the KD of AF cyclic peptide. Counts (B-counts) of the europium-labeled PCSK9 are followed to observe if compounds are adversely PCSK9. A fall off of the B-counts likely indicates a false positive of inhibition. Data from this procedure is reported as “A = ‘numerical value’ (nanomolar)”
The peptide was synthesized on a 0.250 mmol scale on CEM Liberty Blue, Microwave synthesizer using F moc/ZBu chemistry on PS Rink-Amide MBHA resin, 0.32 mmol g 1. The assembly was performed using single-couplings using 4eq of Fmoc protected amino acid 0.2M in DMF, 4eq of
0.5M HATU in DMF, 4eq of 2M DIPEA (double coupling for Tyr). Fmoc deprotection cycles were performed using 20% (V/V) piperidine in DMF.
The sequence of Fmoc protected amino acids and building blocks used are:
1. N-(((9H-fhioren-9-yl)methoxy)carbonyl)-S-trityl-L-cysteine
2. (S)-l((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-2-methylpyrrolidine-2-carboxylic acid
3. (((9H-fluoren-9-yl)methoxy)carbonyl)-L- tyrosine
4. N-(((9H-fluoren-9-yl)methoxy)carbonyl)-N-trityl-L-histidine
5. (S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-4-(tert-butoxy)-4-oxobutanoic acid
6. (S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(5-fluoro- lH-indol-3-yl)propanoic acid
7. (S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(5-fluoro- lH-indol-3-yl)propanoic acid
8. (((9H-fluoren-9-yl)methoxy)carbonyl) glycine
9. N2-(((9H-fluoren-9-yl)methoxy)carbonyl)-N6-(tert-butoxycarbonyl)-L-lysine
10. 3-(tritylthio)propanoic acid
At the end of the assembly, the resin was washed with DMF, MeOH, DCM, Et20. The peptide was cleaved from solid support using 50 ml of TFA solution (v/v) (91% TFA, 5% FhO, 4% TIPS) for approximately 1.5 hours, at room temperature. The resin was filtered, washed with TFA and solution concentrated to dryness and lyophilized. Lyophilization afforded Intermediate Compound Int. A (399mg), which was used as crude in the next step. LCMS anal calcd. C61H75F2N15013S2: 1328.48, found: 1328.2 (M+l)+
Step B - Synthesis of Intermediate Compound Int-B: as described for reagent B Purified by RP-HPLC (Waters Deltapak C4, double cartridge, 40x100 mm, 15pm, 300A; 15% to 35% ACN/water + 0.1% TFA modifier over 20 min). Collected fractions lyophilized to afford 35mg of Intermediate Compound Int-B. LCMS anal calcd. for C69H81F2N15013S2: 1430.62; found: 1430.9 (M+l)+
Step C - Synthesis of Compound Reagent A: as described for reagent B LCMS anal calcd. for C105H122F2N17O26S63-; 2268.58; 1135.8 (M+2)2+
Alexa FRET Plus TR-FRET
The PCSK9 Alexa FRET Plus assay measures the interaction between PCSK9 and an AlexaFluor647 (AF) tagged cyclic peptide, Reagent B (KD = 35nM). A solution containing 1 nM biotinylated PCSK9 + 2.5 nM Lance Streptavidin Europium (Strep-Eu) is made in 50 mM HEPES pH 7.4, 0.15 M NaCl, 5 mM CaC12, 0.01% BSA, and 0.01% Surfactant P20. A separate solution containing 1920 nM of the AlexaFluor tagged cyclic peptide is made in the same buffer system. An
Echo is used to transfer 0.075ul of compound plus 0.675ul of DMSO to each well of an assay plate followed by the addition of 15ul of PCSK9+Stept-Eu and 15ul of AF peptide. The final assay volume is 30.750ul containing 0.5nM PCSK9, 1.25nM Strep-Eu, and 960nM AF cyclic peptide. The reaction is incubated at room temperature for at least two hours prior to fluorescence measurements using an Envision Multilabel Reader. IC50 values are determined by fitting data to a sigmoidal dose- response curve using nonlinear regression. Ki is then calculated from the Ic50 and the KD of AF cyclic peptide. Counts (B-counts) of the europium-labeled PCSK9 are followed to observe if compounds are adversely affecting PCSK9. A fall off of the B-counts is likely indicates a false positive of inhibition. Data from this procedure is reported as “P= ‘numerical value’ (nanomolar)” Reagent B was prepared by the following procedure.
Reagent B
Step A - Synthesis of Intermediate Compound Int-A
The peptide was synthesized on a 0.250 mmol scale on CEM Liberty Blue, Microwave synthesizer using Fmoc/iBu chemistry on PS Rink-Amide MBHA resin, 0.32 mmol g 1. The assembly was performed using single-couplings using 4eq of Fmoc protected amino acid 0.2M in DMF, 4eq of 1M Oxyma in DMF, 4eq of 0.5M /V, /V-d i i sopropyl carbod i i m i dc (DIC) (double coupling for Y01). Fmoc deprotection cycles were performed using 20% (V/V) piperidine in DMF.
The sequence of Fmoc protected amino acids and building blocks used are:
1. N-(((9H-fhioren-9-yl)methoxy)carbonyl)-S-trityl-L-cysteine
2. (S)-l((((9H-fhioren-9-yl)methoxy)carbonyl)amino)-2-methylpyrrolidine-2-carboxylic acid
3. (S)-2-((((9H-fhioren-9-yl)methoxy)carbonyl)amino)-3-(4-methoxyphenyl)propanoic acid
4. N-(((9H-fhioren-9-yl)methoxy)carbonyl)-N-trityl-L-histidine
5. (S)-2-((((9H-fhioren-9-yl)methoxy)carbonyl)amino)-4-(tert-butoxy)-4-oxobutanoic acid
6. (S)-2-((((9H-fhioren-9-yl)methoxy)carbonyl)amino)-3-(5-fhioro-lH-indol-3-yl)propanoic acid
7. (S)-2-((((9H-fhioren-9-yl)methoxy)carbonyl)amino)-3-(5-fhioro-lH-indol-3-yl)propanoic acid
8. (((9H-fluoren-9-yl)methoxy)carbonyl)-D-alanine
9. N2-(((9H-fhioren-9-yl)methoxy)carbonyl)-N6-(tert-butoxycarbonyl)-L-lysine
10. 3-(tritylthio)propanoic acid
At the end of the assembly, the resin was washed with DMF, MeOH, DCM, Et20. The peptide was cleaved from solid support using 50 ml of TFA solution (v/v) (91% TFA, 5% H2O, 4% TIPS) for approximately 1.5 hours, at room temperature. The resin was filtered, washed with TFA and solution concentrated to dryness and lyophilized. Lyophilization afforded Intermediate Compound Int. A (300mg), which was used as crude in the next step. LCMS anal calcd. C63H79F2N15013S2: 1356.53, found: 1356.9 (M+l)+
Step B - Synthesis of Intermediate Compound Int-B
Crude Int-A (0.22 mmol) was dissolved in 24ml of DMF. 6m 1 of 1M aqueous solution of sodium bicarbonate was added to raise the pH to 7. Then 0.26 mmol of l,3-bis(bromomethyl)benzene (0.1M in DMF) were added dropwise. Reaction was left under stirring at room temperature for 20 min, quenched with TFA (pH to 3-4) and then concentrated in vacuo to provide crude Int-B, which was purified by RP-HPLC (Waters XBridge, C18, 50x150 mm, 5pm, 130A; 25% to 40% ACN/water + 0.1% TFA modifier over 20 min). Collected fractions were lyophilized to afford 35mg of Intermediate Compound Int-B. LCMS anal calcd. for C71H85F2N15013S2: 1458.67; found:
1458.8 (M+l)+
Step C - Synthesis of Compound Reagent B
Intermediate Compound Int-B (15mg) was dissolved in 0.2ml of dry DMSO. Then 15mg of ALEXAFLUOR 647NHS Ester (A37566, Life technology) dissolved in 1.5ml of dry DMSO were added. 20uL of dry DIPEA were added. Reaction was left under stirring at room temperature for 12h under Nitrogen atmosphere in the dark. Quenched with TFA (pH to 3-4) and purified by RP-HPLC (Dr Maish, Reprosil Gold Cl 8, 250x20 mm, 120 A, 1 Opm; 20% to 35% of 0.1% TFA in ACN/0.1% TFA in H2O, over 20min, then 35% to 40% over 5min at 20 mF/min flow rate). Collected fractions were lyophilized to afford 16.1 mg of Compound Reagent B. LCMS anal for C107H126F2N17O26S63_:2296.64; found: 1150.6 (M+2)2+
Activity data obtained by one or both of the above-described procedures is reported for selected example compounds of the invention in the following format:
Example No.: A (standard TR Fret) = ‘numerical value’; P (Alexa Fret plus standard TR Fret) = ‘numerical value’ /, note that all values reported are nanomolar.
Alexa FRET Ultra TR-FRET
The PCSK9 Alexa FRET Ultra assay measures the interaction between PCSK9 and an AlexaFluor647 (AF) tagged cyclic peptide, Reagent B (KD = 0.99nM). A solution containing 1 nM biotinylated PCSK9 + 2.5 nM Lance Streptavidin Europium (Strep-Eu) is made in 50 mM HEPES pH 7.4, 0.15 M NaCl, 5 mM CaC12, 0.01% BSA, and 0.01% Surfactant P20. A separate solution containing 1920 nM of the AlexaFluor tagged cyclic peptide is made in the same buffer system. An Echo is used to transfer 0.015 ul of compound plus 0.735 ul of DMSO to each well of an assay plate followed by the addition of 15 ul of PCSK9+Stept-Eu and 15 ul of AF peptide. The final assay volume is 30.750 ul containing 0.5 nM PCSK9, 1.25 nM Strep-Eu, and 960 nM AF cyclic peptide. The reaction is incubated at room temperature for at least two hours prior to fluorescence measurements using an Envision Multilabel Reader. IC50 values are determined by fitting data to a sigmoidal dose-response curve using nonlinear regression. Ki is then calculated from the Ic50 and the KD of AF cyclic peptide. Counts (B-counts) of the europium-labeled PCSK9 are followed to observe if compounds are adversely affecting PCSK9. A fall off of the B-counts is likely indicates a false positive of inhibition. Data from this procedure is reported as “ Ki Ultra = ‘numerical value’ (data reported is nanomolar)”
The following compounds were assessed using the protocol described above and the results are shown in Table 2.
Claims
A is selected from C2-6 alkyl, C2-6 alkenyl or -(CR2)nRx(CR2)n-;
A2 is selected from -(CR2)nX(CR2)n- or -(CR2)nNRC(0)(CR2)n-;
X is O or CR2;
R is independently selected from FI or Ci-6 alkyl;
Ra is independently selected from H, -CR2-S(0)20R9, or -C(0)0R9;
Rb is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N+(CFh)2; Rx is tetrazolyl;
Rd is independently selected from FI or -C(0)0R9;
R1 is selected from:
(a) H,
(b) -(CR2)Z-RX-(CR )ZNR3,
(c) -(CR2)z-Rx-(CR2)z NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3, and
(d) -(CR2)z-Rx-(CR2)z-NRb-C(0)R10;
R2 is selected from:
(a) -(CR2)z-NRb-C(0)R10, and
R5 is independently selected from -(CRa2)x-, -(CRa2)xO(CR¾)x-, and Ci-s alkyl; R6 is independently selected from -(CRa 2)xNRC(0)-, -(CR2)XNRS(0)2-, and -(CRa 2)n0(CRa 2)qNRC(0)-;
R9 is independently selected from FI or Ci-6 alkyl;
R10 is independently selected from:
g) - R5- N (CI I3)2 - (R20)n - (R6)m -R5-[NRC(0)-R5]q, h) - R20- N (CI I3)2 - (R6)m-R5, i) - R5- N (CI I3)2 — (R20)n -(R6)m-R5, j) - R5- N (CI I3)2 — (R20)n - (R6)m-R12, k) -(R20)n- N+(CH3)2 - (R20)n - (R6)q-R12, l) _R6_ R5_ N (CI I3)2 — (R20)n (R6)q -R12, m) -(R20)n-N+(CH3)2- (R6)q-R12, n) — (R20)n - (R6)m- R20- N+(CH3)2 -(R20)S - (R6)q-R12, o) - R20- N (CI I3)2 - (R6)m-R4, p) -(R20)n- N (CI I3)2 - (R6)q — (R20)n - (R6)m-R12, q) - R20- N (CI I3)2 - (R6)m- (R20)n - N (CI I3)2 -(R20)n - (R6)q-R12, r) - R5- N+(CH3)2 - (R6)m- R5- N+(CH3)2 -(R20)n - (R6)q-R12, and s) -CRb2 -(R20)n-(R6)m-R12;
R12 is independently selected from -C 11-20 alkyl-Rd, -(CR2)x-0-(CR2)x -Rd, - C 11-20 alkyl- C(0)NR-(CRd 2)2H, and C2-16 alkenyl;
R20 is independently selected from a) -(CRa2)tO(CR¾)qO-(CRa2)t-, b) -(CRa 2),0(CRa 2)q0-(CRa 2)t-NRC(0)-,
C) -(CRa2)t0(CRa2)q-NRC(0)-(CRa2)n0(CRa2)n0-, d) -(CRa2)t-NRC(0)-(CRa2)q0(CRa2)q0-(CRa 2)t-, e) -(CRa2)tO(CRa2)qO-(CRa2)r, and f) -(CRa2)t-0-(CRa2)q0(CRa2)q0-(CRa 2)t-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3; q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3; t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6;
(CR2)nX(CR )n-; or a pharmaceutically acceptable salt of any thereof.
2. The compound according to Formula I of Claim 1, wherein
A2 is selected from -(CR2)nX(CR2)n- or -(CR2)nNRC(0)(CR2)n-;
X is O or CR2;
R is independently selected from H or Ci-6 alkyl;
Ra is independently selected from H, -CR2-S(0)20R9, or -C(0)OR9;
Rb is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N+(CFI3)2;
Rx is tetrazolyl;
Rd is independently selected from H or -C(0)0R9;
R1 is selected from:
(a) H,
(b) -(CR )Z -RX-(CR2)ZNR3,
(c) -(CR2)Z -RX-(CR2)Z NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3, and
(d) -(CR2)Z- Rx-(CR2)z-NRb-C(0)R10;
R2 is selected from:
(a) -(CR2)z-NRb-C(0)R10, and
(b) -(CR2)z-NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3;
R3 is F;
R5 is independently selected from -(CRa2)x-, -(CRa2)xO(CRa2)x-, and Ci-s alkyl;
R6 is independently selected from -(CRa 2)xNRC(0)-, -(CR2)XNRS(0)2-, and -(CRa 2)n0(CRa 2)qNRC(0)-;
R9 is independently selected from FI or Ci-6 alkyl;
R10 is independently selected from: a) — (R20)n - (R6)m- R5- N+(CH3)2 -R6-R12, b) -R6- R20- N+(CH3)2 — (R20)n -(R6)m -R12, c) - R20- N+(CH3)2 - (R6)m- (R20)n - (R6)q-R12, d) -(R20)n- (R6)m-R12, e) -(R20)n- N+(CH3)2 - (R20)n - (R6)q-R12, f) _R6_ R5_ N (CI I3)2 -(R20)n -(R6)q -R12, g) -(R20)n-N+(CH3)2- (R6)q-R12, h) — (R20)n - (R6)m- R20- N+(CH3)2 -(R20)S - (R6)q-R12, and i) -(R20)n- N+(CH3)2 - (R6)q — (R20)n - (R6)m-R12;
R12 is independently selected from -C 11-20 alkyl-Rd, -(CR2)x-0-(CR2)x -Rd, - C 11-20 alkyl- C(0)NR-(CRd 2)2FI, and C2-16 alkenyl;
R20 is independently selected from a) -(CRa2),0(CRa2)q0-(CRa2)r, b) -(CRa2)t0(CRa2)q0-(CRa 2)t-NRC(0)-, and c) -(CRa2)t-NRC(0)-(CRa2)q0(CRa2)q0-(CRa 2)t-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3;
q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3; t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6; provided that
then A2 is -
(CR2)nX(CR )n-; or a pharmaceutically acceptable salt of any thereof.
3. The compound according to Formula I of Claim 1, wherein:
A2 is -(CR2)nX(CR2)n-;
X is O or CR2;
R is independently selected from H or Ci-6 alkyl;
Ra is independently selected from H or -C(0)0R9;
Rb is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N^CFhk;
Rd is independently selected from H or -C(0)0R9;
Rx is tetrazolyl;
R1 is H;
R2 is selected from:
(a) -(CR2)z-NRb-C(0)R10, and
(b) -(CR2)z-NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3;
R5 is independently selected from -(CRa2)x-, -(CRa2)xO(CR¾)x-, and Ci-s alkyl; R6 is independently selected from -(CRa 2)xNRC(0)-, -(CR2)XNRS(0)2-, and -(CRa 2)n0(CRa 2)qNRC(0)-;
R9 is independently selected from H or Ci-6 alkyl;
R10 is independently selected from: a) - (R5- N+(CH3)2 -R6)u-(R20)n -(R6)m-R12, b) — (R20)n - (R6)m- R5- N+(CH3)2 -R6-R12, c) -(R20)n- R5- N (CI I3)2 -(R20)S -(R6)q-R12, d) -R6- R20- N+(CH3)2 — (R20)n -(R6)m -R12, e) - R20- N (CI I3)2 - (R6)m- (R20)n - (R6)q-R12, f) -(R20)n- (R6)m-R12, g) - R5- N (CI I3)2 - (R20)n - (R6)m -R5-[NRC(0)-R5]q, h) - R20- N (CI I3)2 - (R6)m-R5, i) - R5- N (CI I3)2 — (R20)n -(R6)m-R5, j) - R5- N (CI I3)2 — (R20)n - (R6)m-R12, k) -(R20)n- N+(CH3)2 - (R20)n - (R6)q-R12, l) .Re. R5_ N (CI I3)2 -(R20)n (R6)q ~R12, m) -(R20)n-N+(CH3)2- (R6)q-R12, n) — (R20)n - (R6)m- R20- N+(CH3)2 -(R20)S - (R6)q-R12, o) - R20- N+(CH3)2 - (R6)m-R4, p) -(R20)n- N (CI I3)2 - (R6)q — (R20)n - (R6)m-R12, q) - R20- N (CI I3)2 - (R6)m- (R20)n - N (CI I3)2 -(R20)n - (R6)q-R12, r) - R5- N+(CH3)2 - (R6)m- R5- N+(CH3)2 -(R20)n - (R6)q-R12, and s) -CRb2 -(R20)n-(R6)m-R12;
R12 is independently selected from -C 11-20 alkyl-Rd, -(CR2)x-0-(CR2)x -Rd, - C 11-20 alkyl- C(0)NR-(CRd 2)2H, and C2-16 alkenyl;
R20 is independently selected from a) -(CRa2)tO(CR¾)qO-(CRa2)t-, b) -(CRa 2),0(CRa 2)q0-(CRa 2)t-NRC(0)-,
C) -(CRa2)t0(CRa2)q-NRC(0)-(CRa2)n0(CRa2)n0-, d) -(CRa2)t-NRC(0)-(CRa2)q0(CRa2)q0-(CRa 2)t-, e) -(CRa2)tO(CRa2)qO-(CRa2)r, and f) -(CRa2)t-0-(CRa2)q0(CRa2)q0-(CRa 2)t-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3; q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3; t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6; or a pharmaceutically acceptable salt of any thereof.
4. The compound according to Formula I of Claim 1, wherein
X is O or CR2;
R is independently selected from H or Ci-6 alkyl;
Ra is independently selected from H or -C(0)OR9;
Rb is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N+(CH3)2; Rx is tetrazolyl;
Rd is independently selected from H or -C(0)OR9;
R1 is H;
R2 is selected from:
(a) -(CR2)z-NRb-C(0)R10, and
(b) -(CR2)z-NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3;
R5 is independently selected from -(CRa2)x-, -(CRa2)xO(CRa2)x-, and Ci-s alkyl; R6 is independently selected from -(CRa 2)xNRC(0)-, -(CR2)XNRS(0)2-, and -(CRa2)n0(CRa 2)qNRC(0)-;
R9 is independently selected from FI or Ci-6 alkyl;
R12 is independently selected from -C 11-20 alkyl-Rd, -(CR2)x-0-(CR2)x -Rd, - C 11-20 alkyl- C(0)NR-(CRd 2)2H, and C2-16 alkenyl;
R20 is independently selected from a) -(CRa2)tO(CR¾)qO-(CRa2)t-, b) -(CRa2)t0(CRa2)q0-(CRa 2)t-NRC(0)-,
C) -(CRa2)t0(CRa2)q-NRC(0)-(CRa2)n0(CRa2)n0-, d) -(CRa2)t-NRC(0)-(CRa2)q0(CRa2)q0-(CRa2),-, e) -(CRa2)tO(CRa2)qO-(CRa 2)t-, and f) -(CRa2),-0-(CRa2)q0(CRa2)q0-(CRa2),-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3; q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3; t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6; or a pharmaceutically acceptable salt of any thereof.
5. The compound according to Formula I of Claim 1, wherein
A2 is -(CR2)nNRC(0)(CR )n-;
R is independently selected from H or Ci-6 alkyl;
Ra is independently selected from H or -C(0)OR9;
Rb is independently selected from H, Ci-6 alkyl, or Ci-6 alkyl-N+(CH3)2; Rx is tetrazolyl;
Rd is independently selected from H or -C(0)OR9;
R1 is selected from:
(a) -(CR )Z -RX-(CR2)ZNR2,
(b) -(CRa)z -RX-(CR )Z NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3, and
(c) -(CR2)Z- Rx-(CR2)z-NRb-C(0)R10;
R2 is selected from:
(a) -(CR2)z-NRb-C(0)R10, and
(b) -(CR2)z-NR-C(0)-(CR2)z[0(CR2)n]r-N+(CH3)3;
R5 is independently selected from -(CRa2)x-, -(CRa2)xO(CRa2)x-, and Ci-s alkyl; R6 is independently selected from -(CRa 2)xNRC(0)-, -(CR2)XNRS(0)2-, and -(CRa2)n0(CRa 2)qNRC(0)-;
R9 is independently selected from FI or Ci-6 alkyl;
R10 is independently selected from: a) - (R5- N (CI l3)2 -R6)u-(R20)n -(R6)m-R12, b) — (R20)n - (R6)m- R5- N (C l 13 ) 2 -R6-R12, c) -(R20)n- R5- N ( C' 1 13 )2 -(R20)s -(R6)q-R12, d) -R6- R20- N+(CH3)2 -(R20)n -(R6)m -R12, e) - R20- N+(CH3)2 - (R6)m- (R20)n - (R6)q-R12, f) -(R20)n- (R6)m-R12, g) - R5- N+(CH3)2 - (R2°)n - (R6)m -R5-[NRC(0)-R5]q, h) - R20- N (CI l3)2 - (R6)m-R5, i) - R5- N (Cl 13)2 — (R20)n -(R6)m-R5, j) - R5- N (CI l3)2 — (R20)n - (R6)m-R12, k) -(R20)n- N+(CH3)2 - (R20)n - (R6)q-R12, l) _R6_ R5_ N (Cl 13 )2 — (R20)n -(R6)q -R12, m) -(R20)n-N+(CH3)2- (R6)q-R12, n) -(R20)n - (R6)m- R20- N (CI l3)2 -(R20)s - (R6)q-R12,
R12 is independently selected from -Cn-2o alkyl-Rd, -(CR2)x-0-(CR2)x -Rd, - Cn-2o alkyl- C(0)NR-(CRd 2)2H, andC2-16 alkenyl;
R20 is independently selected from a) -(CRa 2)tO(CRa 2)qO-(CRa 2)t-, b) -(CRa 2)t0(CRa 2)q0-(CRa 2)t-NRC(0)-, c) -(CRa 2)t0(CRa 2)q-NRC(0)-(CRa 2)n0(CRa 2)n0-, d) -(CRa 2)t-NRC(0)-(CRa 2)q0(CRa 2)q0-(CRa 2)t-, e) -(CRa 2)tO(CRa 2)qO-(CRa 2)r, and f) -(CRa 2)t-0-(CRa 2)q0(CRa 2)q0-(CRa 2)t-; m is independently selected from 0, 1, 2, 3 or 4; n is independently selected from 1, 2 or 3; q is independently selected from 1, 2, 3 or 4; r is independently selected from 0, 1, 2, 3 or 4; s is independently selected from 0, 1, 2 or 3; t is independently selected from 0, 1, 2 or 3; u is 1 or 2; x is independently selected from 1, 2, 3, 4, 5, 6, 7, or 8; z is independently selected from 1, 2, 3, 4, 5 or 6; or a pharmaceutically acceptable salt of any thereof.
6. The compound of Claim 1, which is selected from the group consisting of: Ex-1, Ex- 2, Ex-3, Ex-4, Ex-5, Ex-6, Ex-7, Ex-8, Ex-9, Ex-10, Ex-11, Ex-12, and Ex-13, or a pharmaceutically acceptable salt thereof.
7. The compound of Claim 6, selected from Ex-7, Ex-9, Ex-11, and Ex- 13, or a pharmaceutically acceptable salt thereof.
10. A composition comprising at least one compound of any one of claims 1 to 9, or a pharmaceutically acceptable salt thereof, and at least one pharmaceutically acceptable excipient.
11. A method of treating hypercholesterolemia, comprising administering to a patient in need thereof a therapeutically effective amount of a composition of Claim 10.
12. A method of treating hypercholesterolemia, comprising administering to a patient in need thereof a therapeutically effective amount of a compound of any of Claims 1 to 9.
13. A compound according to any of Claims 1 to 9, or a pharmaceutically acceptable salt thereof, for use in therapy.
14. A compound according to any of Claims 1 to 9, or a pharmaceutically acceptable salt thereof, for treating hypercholesterolemia.
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US11814444B2 (en) | 2018-06-21 | 2023-11-14 | Ra Pharmaceuticals, Inc. | Cyclic polypeptides for PCSK9 inhibition |
US11814445B2 (en) | 2018-06-21 | 2023-11-14 | Ra Pharmaceuticals, Inc. | Cyclic polypeptides for PCSK9 inhibition |
US11932705B2 (en) | 2020-12-18 | 2024-03-19 | Merck Sharp & Dohme Llc | Cyclic polypeptides for PCSK9 inhibition |
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US11484565B2 (en) * | 2019-08-30 | 2022-11-01 | Merck Sharp & Dohme Llc | PCSK9 antagonist compounds |
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US5104869A (en) * | 1989-10-11 | 1992-04-14 | American Cyanamid Company | Renin inhibitors |
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US20190177366A1 (en) * | 2016-06-24 | 2019-06-13 | Genentech, Inc. | Compositions and methods for treating cardiovascular disease |
US20190389909A1 (en) * | 2018-06-21 | 2019-12-26 | Merck Sharp & Dohme Corp. | Pcsk9 antagonist compounds |
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BR112014006684A2 (en) * | 2011-09-23 | 2017-03-28 | Novo Nordisk As | glucagon analogs |
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US5104869A (en) * | 1989-10-11 | 1992-04-14 | American Cyanamid Company | Renin inhibitors |
US20110301079A1 (en) * | 2007-09-21 | 2011-12-08 | Instituto Di Ricerche Di Biologia Molecolare P. Angeletti S.P.A. | Neuromedin u receptor agonists and uses thereof |
US20190177366A1 (en) * | 2016-06-24 | 2019-06-13 | Genentech, Inc. | Compositions and methods for treating cardiovascular disease |
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Cited By (3)
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US11814444B2 (en) | 2018-06-21 | 2023-11-14 | Ra Pharmaceuticals, Inc. | Cyclic polypeptides for PCSK9 inhibition |
US11814445B2 (en) | 2018-06-21 | 2023-11-14 | Ra Pharmaceuticals, Inc. | Cyclic polypeptides for PCSK9 inhibition |
US11932705B2 (en) | 2020-12-18 | 2024-03-19 | Merck Sharp & Dohme Llc | Cyclic polypeptides for PCSK9 inhibition |
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