WO2010138488A1 - Hepatitis c virus inhibitors - Google Patents

Hepatitis c virus inhibitors Download PDF

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WO2010138488A1
WO2010138488A1 PCT/US2010/036033 US2010036033W WO2010138488A1 WO 2010138488 A1 WO2010138488 A1 WO 2010138488A1 US 2010036033 W US2010036033 W US 2010036033W WO 2010138488 A1 WO2010138488 A1 WO 2010138488A1
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alkyl
hydrogen
mmol
cap
independently selected
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PCT/US2010/036033
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French (fr)
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Rico Lavoie
Clint A. James
Edward H. Ruediger
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Bristol-Myers Squibb Company
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Priority to CN201080034457.4A priority Critical patent/CN102459250B/en
Priority to JP2012513170A priority patent/JP5615352B2/en
Priority to EP10720511.4A priority patent/EP2435429B1/en
Publication of WO2010138488A1 publication Critical patent/WO2010138488A1/en

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
    • C07D413/10—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a carbon chain containing aromatic rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/16—Drugs for disorders of the alimentary tract or the digestive system for liver or gallbladder disorders, e.g. hepatoprotective agents, cholagogues, litholytics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A61P31/14—Antivirals for RNA viruses
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
    • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
    • C07D403/10—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a carbon chain containing aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
    • C07D403/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing three or more hetero rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing three or more hetero rings

Abstract

This disclosure concerns novel compounds of Formula (I) as defined in the specification and compositions comprising such novel compounds. These compounds are useful antiviral agents, especially in inhibiting the function of the NS5A protein encoded by Hepatitis C virus (HCV). Thus, the disclosure also concerns a method of treating HCV related diseases or conditions by use of these novel compounds or a composition comprising such novel compounds.

Description

HEPATITIS C VIRUS INHIBITORS
CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Provisional Application Serial Number 61/182,162 filed May 29, 2009.
FIELD OF THE DISCLOSURE
The present disclosure is generally directed to antiviral compounds, and more specifically directed to compounds which can inhibit the function of the NS 5 A protein encoded by Hepatitis C virus (HCV), compositions comprising such compounds, and methods for inhibiting the function of the NS 5 A protein.
BACKGROUND OF THE DISCLOSURE
HCV is a major human pathogen, infecting an estimated 170 million persons worldwide - roughly five times the number infected by human immunodeficiency virus type 1. A substantial fraction of these HCV infected individuals develop serious progressive liver disease, including cirrhosis and hepatocellular carcinoma.
The current standard of care for HCV9 which employs a combination of pegylated-interferon and rivbavirin, has a non- optimal success rate in achieving sustained viral response and causes numerous side effects. Thus, there is a clear and long-felt need to develop effective therapies to address this undermet medical need.
HCV is a positive-stranded RNA virus. Based on a comparison of the deduced amino acid sequence and the extensive similarity in the 5' untranslated region, HCV has been classified as a separate genus in the Flaviviridae family. All members of the Flaviviridae family have enveloped virions that contain a positive stranded RNA genome encoding all known virus-specific proteins via translation of a single, uninterrupted, open reading frame.
Considerable heterogeneity is found within the nucleotide and encoded amino acid sequence throughout the HCV genome due to the high error rate of the encoded RNA dependent RNA polymerase which lacks a proof-reading capability. At least six major genotypes have been characterized, and more than 50 subtypes have been described with distribution worldwide. The clinical significance of the genetic
I heterogeneity of HCV has demonstrated a propensity for mutations to arise during monotherapy treatment, thus additional treatment options for use are desired. The possible modulator effect of genotypes on pathogenesis and therapy remains elusive. The single strand HCV RNA genome is approximately 9500 nucleotides in length and has a single open reading frame (ORF) encoding a single large polyprotein of about 3000 amino acids. In infected cells, this polyprotein is cleaved at multiple sites by cellular and viral proteases to produce the structural and non-structural (NS) proteins. In the case of HCV, the generation of mature non-structural proteins (NS2, NS3, NS4A, NS4B; NS5A, and NS5B) is effected by two viral proteases. The first one is believed to be a metalloprotease and cleaves at the NS2-NS3 junction; the second one is a serine protease contained within the N-terminal region of NS3 (also referred to herein as NS 3 protease) and mediates all the subsequent cleavages downstream of NS3, both in cis, at the NS3-NS4A cleavage site, and in trans, for the remaining NS4A-NS4B, NS4B-NS5A, NS5A-NS5B sites. The NS4A protein appears to serve multiple functions by both acting as a cofactor for the NS 3 protease and assisting in the membrane localization of NS3 and other viral replicase components. The formation of a NS3-NS4A complex is necessary for proper protease activity resulting in increased proteolytic efficiency of the cleavage events. The NS3 protein also exhibits nucleoside triphosphatase and RNA helicase activities. NS5B (also referred to herein as HCV polymerase) is a RNA-dependent RNA polymerase that is involved in the replication of HCV genome with other HCV proteins, including NS 5 A, in a replicase complex.
Compounds useful for treating HC V-infected patients are desired which selectively inhibit HCV viral replication. In particular, compounds which are effective to inhibit the function of the NS5A protein are desired. The HCV NS5A protein is described, for example, in the following references: S. L. Tan, et al., Virology, 284:1-12 (2001); K.-J. Park, et al., 7. Biol. Chem., 30711-30718 (2003); T. L. Tellinghuisen, et al., Nature, 435, 374 (2005); R. A. Love, et al., J. Virol, 83, 4395 (2009); N. Appel, et al., J. Biol. Chem., 281, 9833 (2006); L. Huang, J. Biol Chem., 280, 36417 (2005); C. Rice, et al., WO2006093867. SUMMARY OF THE DISCLOSURE
The present disclosure provides compounds which selectively inhibit HCV viral replication, as characterized by Formula (I):
Figure imgf000004_0001
(I) or a pharmaceutically acceptable salt thereof, wherein: Z is oxygen (O) or N-H; Rl is hydrogen (H) or -C(O)R*; R2 is hydrogen (H) or -C(O)Ry; Rx and Ry are independently selected from cycloalkyl, heteroaryl, heterocyclyl, alkoxy, and alkyl, said alkyl being substituted by one or more substituents independently selected from aryl, alkenyl, cycloalkyl, heterocyclyl, heteroaryl, -OR3, -C(O)OR4, -NRaRb and ~C(0)NRcRd, wherein any said aryl and heteroaryl may optionally be substituted with one or more substituents independently selected from alkyl, haloalkyl, arylalkyl, heterocyclyl, heterocyclylalkyl, halogen, cyano, nitro, -C(O)OR4, -OR5, -NRaRb, (NRaRb)alkyl, and (MeO)(HO)P(O)O-, and wherein any said cycloalkyl and heterocyclyl may optionally be fused onto an aromatic ring and may optionally be substituted with one or more substituents independently selected from alkyl, hydroxyl, halogen, aryl, -NRaRb, oxo, and -C(O)OR4;
R3 is hydrogen, alkyl, or arylalkyl; R4 is alkyl or arylalkyl; R5 is hydrogen, alkyl, or arylalkyl; Ra and Rb are independently selected from hydrogen, alkyl, cycloalkyl, arylalkyl, heteroaryl, -C(O)R^, -C(O)OR7, -C(O)NR^Rd, and (NR^Rd)alkyl, or alternatively, Ra and Rb, together with the nitrogen atom to which they are attached, form a five- or six-membered ring or bridged bicyclic ring structure, wherein said five- or six-membered ring or bridged bicyclic ring structure optionally may contain one or two additional heteroatoms independently selected from nitrogen, oxygen, and sulfur and may contain one, two, or three substituents independently selected from C\ to Cβ alkyl, C\ to C4 haloalkyl, aryl, hydroxyl, Cj to Cg alkoxy, C1 to C4 haloalkoxy, and halogen;
R6 is alkyl;
W is alkyl, arylalkyl, cycloalkyl, or haloalkyl;
R30 and R31 are independently selected from hydrogen and alkyl; wherein the alkyl can optionally form a fused three- to six-membered ring with an adjacent carbon atom or optionally form a spirocyclic three- to six-membered ring with the carbon to which it is attached; and
Rc and Rd are independently selected from hydrogen, alkyl, arylalkyl, and cycloalkyl. The compounds' of the present disclosure can be effective to inhibit the function of the HCV NS 5 A protein. In particular the compounds of the present disclosure can be effective to inhibit the HCV Ib genotype or multiple genotypes of HCV. Therefore., this disclosure also encompasses: (1) compositions comprising a compound of Formula (I), or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier; and (2) a method of treating an HCV infection in a patient, comprising administering to the patient a therapeutically effective amount of a compound of Formula (I), or a pharmaceutically acceptable salt thereof.
DETAILED DESCRIPTION OF THE DISCLOSURE In a first aspect of the present disclosure compounds of Formula (I) are provided:
Figure imgf000005_0001
(I). In a first embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein: Z is oxygen (O) or N-H; Rl is hydrogen (H) or -C(O)RX; R2 is hydrogen (H) or -C(O)Ry;
Rx and Ry are independently selected from cycloalkyl, heteroaryl, heterocyclyl, alkoxy, and alkyl, said alkyl being substituted by one or more, preferably one to three, substituents independently selected from aryl, alkenyl, cycloalkyl, heterocyclyl, heteroaryl, -OR3, -C(O)OR*, -NRaRb, and -C(0)NRcRd, wherein any said aryl and heteroaryl may optionally be substituted with one or more, preferably one to three, substituents independently selected from alkyl, haloalkyl, arylalkyl, heterocyclyl, heterocyclylalkyl, halogen, cyano, nitro, -C(O)OR4, -OR5, -NRaRb (NRaRb)alkyl, and (MeO)(HO)P(O)O-, and wherein any said cycloalkyl and heterocyclyl may optionally be fused onto an aromatic ring and may optionally be substituted with one or more, preferably one to three, substituents independently selected from alkyl, hydroxyl, halogen, aryl, -NRaRb, oxo, and -C(O)OR4;
R3 is hydrogen, alkyl, or arylalkyl; R4 is alkyl or arylalkyl; R5 is hydrogen, alkyl, or arylalkyl;
Ra and Rb are independently selected from hydrogen, alkyl, cycloalkyl, arylalkyl, heteroaryl, -C(O)R^, -C(O)OR7, -C(0)NRcRd, and (NRcRd)alkyl, or alternatively, Ra and Rb, together with the nitrogen atom to which they are attached, form a five- or six-membered ring or bridged bicyclic ring structure, wherein said five- or six-membered ring or bridged bicyclic ring structure optionally may contain one or two additional heteroatoms independently selected from nitrogen, oxygen, and sulfur and may contain one, two, or three substituents independently selected from Ci to Cg alkyl, Cj to C4 haloalkyl, aryl, hydroxyl, Cj to Cg alkoxy, Cj to C4 haloalkoxy, and halogen; R6 is alkyl;
R7 is alkyl, arylalkyl, cycloalkyl, or haloalkyl; R30 and R31 are independently selected from hydrogen and alkyl; wherein the alkyl can optionally form a fused three- to six-membered ring with an adjacent carbon atom or optionally form a spirocyclic three- to six-membered ring with the carbon to which it is attached; and Rc and Rd are independently selected from hydrogen, alkyl, arylalkyl, and cycloalkyl.
In a second embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein Z is oxygen, further characterized by Formula (Ia):
Figure imgf000007_0001
(Ia) wherein:
R1 is hydrogen (H) or ™C(O)RX; R2 is hydrogen (H) or -C(O)Ry;
Rx and Ry are independently selected from cycloalkyl, heteroaryl, heterocyclyl, alkoxy, and alkyl, said alkyl being substituted by one or more, preferably one to three, substituents independently selected from aryl, alkenyl, cycloalkyl, heterocyclyl, heteroaryl -OR3, -C(O)OR4, -NRaRb > and -C(O)NRcRd, wherein any said aryl and heteroaryl may optionally be substituted with one or more, preferably one to three, substituents independently selected from alkyl, haloalkyl, arylalkyl, heterocyclyl, heterocyclylalkyl, halogen, cyano, nitro, -C(O)OR4, -OR5, -NRaRb, (NRaRb)alkyl, and (MeO)(HO)P(O)O-, and wherein any said cycloalkyl and heterocyclyl may optionally be fused onto an aromatic ring and may optionally be substituted with one or more, preferably one to three, substituents independently selected from alkyl, hydroxyl, halogen, aryl, -NRaRb, oxo, and -C(O)OR4;
R3 is hydrogen, alkyl, or arylalkyl; R4 Is alkyl or arylalkyl;
R5 is hydrogen, alkyl, or arylalkyl;
Ra and Rb are independently selected from hydrogen, alkyl, cycloalkyl, arylalkyl, heteroaryl, -C(O)R6, -C(O)OR7, -C(0)NRcRd, and (NRcRd)alkyl, or alternatively, Ra and Rb, together with the nitrogen atom to which they are attached, form a five- or six-membered ring or bridged bicyclic ring structure, wherein said five- or six-membered ring or bridged bicyclic ring structure optionally may contain one or two additional heteroatoms independently selected from nitrogen, oxygen, and sulfur and may contain one, two, or three substituents independently selected from Cj to Cg alkyl, Cj to C4 haloalkyl, aryl, hydroxyl, Cj to C6 alkoxy, C1 to C4 haloalkoxy, and halogen;
R6 is alkyl;
R7 is alkyl, arylalkyl, cycloalkyl, or haloalkyl;
R30 and R31 are independently selected from hydrogen and alkyl; wherein the alkyl can optionally form a fused three- to six-membered ring with an adjacent carbon atom or optionally form a spirocyclic three- to six-membered ring with the carbon to which it is attached; and
Rc and R^ are independently selected from hydrogen, alkyl, arylalkyl, and cycloalkyl.
In a third embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein Z is NH, further characterized by Formula (Ib):
Figure imgf000008_0001
(Ib), wherein:
R1 is hydrogen (H) or -C(O)RX; R2 is hydrogen (H) or -C(O)RY; R* and R^ are independently selected from cycloalkyl, heteroaryl, heterocyclyl, alkoxy, and alkyl, said alkyl being substituted by one or more, preferably one to three, substituents independently selected from aryl, alkenyl, cycloalkyl, heterocyclyl, heteroaryl, -OR3, -C(O)OR4, -NRaRb, and -C(O)NRcRd > wherein any said aryl and heteroaryl may optionally be substituted with one or more, preferably one to three, substituents independently selected from alkyl, haloalkyl, arylalkyl, heterocyclyl, heterocyclylalkyl, halogen, cyano, nitro, -C(O)OR4, -OR5, -NRaRb; (NRaRb)alkyl, and (MeO)(HO)P(O)O-, and wherein any said cycloalkyl and heterocyclyl may optionally be fused onto an aromatic ring and may optionally be substituted with one or more, preferably one to three, substituents independently selected from alkyl, hydroxyl, halogen, aryl, ~NRaRb, oxo, and -C(O)OR4;
R3 is hydrogen, alkyl, or arylalkyl; R4 is alkyl or arylalkyl; R5 is hydrogen, alkyl, or arylalkyl;
Ra and Rb are independently selected from hydrogen, alkyl, cycloalkyl, arylalkyl, heteroaryl, -C(0)R<\ -C(O)OR7, ~C(0)NRcRd, and (NRcRd)alkyl, or alternatively, Ra and Rb, together with the nitrogen atom to which they are attached, form a five- or six-membered ring or bridged bicyclic ring structure, wherein said five- or six-membered ring or bridged bicyclic ring structure optionally may contain one or two additional heteroatoms independently selected from nitrogen, oxygen, and sulfur and may contain one, two, or three substituents independently selected from C i to Cg alkyl, Cj to C4 haloalkyl, aryl, hydroxyl, C1 to Cg alkoxy, C1 to C4 haloalkoxy, and halogen; R6 is alkyl;
R7 is alkyl, arylalkyl, cycloalkyl, or haloalkyl;
R30 and R31 are independently selected from hydrogen and alkyl; wherein the alkyl can optionally form a fused three- to six-membered ring with an adjacent carbon atom or optionally form a spirocyclic three- to six-membered ring with the carbon to which it is attached; and Rc and Rd are independently selected from hydrogen, alkyl, arylalkyl, and cycloalkyl.
In a fourth embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein:
Z is oxygen (O) or NH;
R1 Is ~C(O)RX;
R2 is -C(O)Ry;
Rx and Ry are independently alkyl substituted by at least one -NRaRb, characterized by Formula (A) : oa Rb
R8" / \ /m
R9
(A), wherein; m is O or 1 ; R8 is hydrogen or alkyl;
R9 is selected from hydrogen, cycloalkyl, aryl, heteroaryl, heterocyclyl, and alkyl optionally substituted with a substituent selected from aryl, alkenyl, cycloalkyl, heterocyclyl, heteroaryl, heterobicyclyl, -OR3, -C(O)OR4, -NRaRb, and -C(0)NRcRd, wherein any said aryl and heteroaryl may optionally be substituted with one or more, preferably one to three, substituents independently selected from alkyl, haloalkyl, arylalkyl, heterocyclyl, heterocyclylalkyl, halogen, cyano, nitro, -C(O)OR4, -OR5, -NRaRb, (NRaRb)alkyl, and (MeO)(HO)P(O)O-, and wherein any said cycloalkyl and heterocyclyl may optionally be fused onto an aromatic ring and may optionally be substituted with one or more, preferably one to three, substituents independently selected from alkyl, hydroxyl, halogen, aryl, -NRaRb oxo, and -C(O)OR4;
R3 is hydrogen, alkyl, or arylalkyl; R4 is alkyl or arylalkyl; R5 is hydrogen, alkyl, or arylalkyl;
Ra and Rb are independently selected from hydrogen, alkyl, cycloalkyl, arylalkyl, heteroaryl, -C(O)R6, -C(O)OR7, -C(0)NRcR<ϊ, and (NRcRd)alkyl, or alternatively, Ra and Rb, together with the nitrogen atom to which they are attached, form a five- or six-membered ring or bridged bicyclic ring structure, wherein said five- or six-membered ring or bridged bicyclic ring structure optionally may contain one or two additional heteroatoms independently selected from nitrogen, oxygen, and sulfur and may contain one, two, or three substituents independently selected from C1 to Cβ alkyl, Cj to C4 haloalkyl, aryl, hydroxyl, C1 to C6 alkoxy, C1 to C4 haloalkoxy, and halogen; R6 is alkyl;
R7 is alky!, arylalkyl, cycloalkyl, or haloalkyl;
R30 and R31 are independently selected from hydrogen and alkyl; wherein the alkyl can optionally form a fused three- to six-membered ring with an adjacent carbon atom or optionally form a spirocyclic three- to six-membered ring with the carbon to which it is attached; and
Rc and Rd are independently selected from hydrogen, alkyl, arylalkyl, and cycloalkyl.
In a fifth embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein: Z is oxygen (O) or NH; R1 is -C(O)RX; R2 is -C(O)Ry; Rx and Ry are independently alkyl substituted by at least one -NRaRb, characterized by Formula (A):
Figure imgf000011_0001
(A), wherein: m is O;
R8 is hydrogen or Cj to C4 alkyl;
R9 is selected from hydrogen, C1 to Cg alkyl optionally substituted with -OR12, C3 to C6 cycloalkyl, allyl, -CH2C(O)NRcRd, (NRcRd)alkyl;
Figure imgf000012_0001
wherein: j is 0 or 1 ; k is I, 2, or 3; n is 0 or an integer selected from 1 through 4; each R10 is independently hydrogen, C1 to C4 alkyl, Cj to C4 haloalkyl, halogen, nitro, -OBn, or (MeO)(OH)P(O)O-; R1 1 is hydrogen, C j to C4 alkyl, or benzyl;
R12 is hydrogen, Cj to C4 alkyl, or benzyl;
Ra is hydrogen or Cj to C4 alkyl;
Rb is Cj to C4 alkyl, C3 to Cg cycloalkyl, benzyl, 3-pyridyl, pyrimidin-5-yl, acetyl, -C(O)OR7, or -C(0)NRcRd;
R7 is C1 to C4 alkyl or C1 to C4 haloalkyl;
R30 and R31 are independently selected from hydrogen and alkyl; wherein the alkyl can optionally form a fused three- to six-membered ring with an adjacent carbon atom or optionally form a spirocyclic three- to six-membered ring with the carbon to which it is attached;
Rc is hydrogen or C1 to C4 alkyl; and
Rd is hydrogen, Cj to C4 alkyl, or C3 to C6 cycloalkyl.
In a sixth embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein:
Z is oxygen (O) or NH;
R1 is -C(O)R*;
R2 is -C(O)Ry;
Rx and Ry are independently alkyl substituted by at least one -NRaRb, characterized by Formula (A):
Figure imgf000013_0001
(A), wherein: m is O; R8 is hydrogen; R9 is phenyl optionally substituted with one up to five substituents independently selected from C1 to Cg alkyl, C] to C4 haloalkyl, halogen, C1 to Cg alkoxy, hydroxyl, cyano, and nitro; and
NRaRb is a heterocyclyl or heterobicyclyl group selected from:
(R13)π (R13)n
- i-N ~V )n ■ -N r - -N N-R14 - -N O
Figure imgf000014_0001
wherein: n is O, 1, or 2; each R* 3 is independently selected from Cj to C^ alkyl, phenyl, trifluoromethyl, halogen, hydroxyl, methoxy, and oxo; and
R14 is C1 to C6 alkyl, phenyl, benzyl, or -C(O)OR15 group, wherein R15 is C1 to C4 alkyl, phenyl, or benzyl.
In a seventh embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein:
Z is oxygen (O) or NH;
R1 Is -C(O)RX;
R2 is -C(O)Ry;
Rx and Ry are independently alkyl substituted by at least one -NRaRb, characterized by Formula (A):
Figure imgf000015_0001
(A), wherein: m i s l;
R8 is hydrogen;
R9 is Cj to Cg alkyl, arylalkyl, or heteroarylalkyl;
Ra is hydrogen; and
Rb is -C(0)0R7 s wherein R7 is C1 to ( Z6 alkyl.
In an eighth embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein:
Z is oxygen (O) or NH;
R1 is -C(O)RX;
R2 is -C(O)Ry; and Rx and Ry are heteroaryl or heterocyclyl independently selected from:
Figure imgf000015_0002
Figure imgf000016_0001
wherein: n is 0 or an integer selected from 1 through 4; each R13 is independently selected from hydrogen, Cj to C β alkyl, Cj to C4 haioalkyl, phenyl, benzyl, C1 to C 5 alkoxy, Cj to C4 haloalkoxy, heterocyclyl, halogen, NRcRd, hydroxyl, cyano, and oxo, where Rc and Rd are independently hydrogen or Cj to C4 alkyl; and
R14 is hydrogen (H), C1 to C6 alkyl, benzyl, or -C(O)OR4, wherein R4 is C1 to C6 alkyl.
In a ninth embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein:
Z is oxygen (O) or NH; Rl is -C(O)RX;
R2 is -C(O)Ry; and
Rx and Ry are cycloalkyl independently selected from:
Figure imgf000016_0002
wherein: j is 0, 1, 2, or 3; k is O, I, or 2; n is O or an integer selected from 1 though 4; each R13 is independently selected from hydrogen, C3 to C6 alkyl, Cj to C4 haloalkyl, C] to C6 alkoxy, halogen, hydroxyl, cyano, and nitro; and
Ra and Rb are independently hydrogen, Cj to C6 alkyl, or -C(O)OR7, wherein R7 is C3 to C6 alkyl.
In a tenth embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein: Z is oxygen (O) or NH; R1 is -C(O)RX; R2 is -C(O)Ry; and
Rx and Ry are independently arylalkyl optionally substituted with (NRaRb)alkyl, wherein Ra and Rb are independently hydrogen, Cj to C6 alkyl, or benzyl, or alternatively, Ra and Rb, together with the nitrogen atom to which they are
attached, form a five- or six-membered ring selected from
Figure imgf000017_0001
,
Figure imgf000017_0002
s and , wherein R15 is hydrogen, C] to C6 alkyl, or benzyl.
In an eleventh embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein: Z is oxygen (O) or NH;
R1 and R2 are the same and are selected from the group consisting of:
Figure imgf000018_0001
wherein a squiggle bond ( >/wv ) in the structure indicates that a stereogenic center to which the bond is attached can take either (R)- or (S)- configuration so long as chemical bonding principles are not violated. In a twelfth embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein: Z is oxygen (O) or NH; RHs -C(O)R*; R2 is -C(O)Ry; and
Rx and Ry are both t-butoxy.
In a thirteenth embodiment of the first aspect, the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein: Z is oxygen (O) or NH; and
Rl and R^ are both hydrogen.
In a fourteenth embodiment of the first aspect, the present disclosure provides a compound of Formula (II):
Figure imgf000019_0001
(II) or a pharmaceutically acceptable salt thereof, wherein: Z is oxygen (O) or N-H; Rl is hydrogen (H) or -C(O)R*; R2 is hydrogen (H) or -C(O)Ry;
Rx and Ry are independently selected from cycloalkyl, heteroaryl, heterocyclyl, alkoxy, and alkyl, said alkyl being substituted by one or more substituents independently selected from aryl, alkenyl, cycloalkyl, heterocyclyl, heteroaryl, -OR3, -C(O)OR4, -NR3Rb, and -C(0)NRcRd, wherein any said aryl and heteroaryl may optionally be substituted with one or more substituents independently selected from alkyl, haloalkyl, arylalkyl, heterocyclyl, heterocyclylalkyl, halogen, cyano, nitro, -C(O)OR4, -OR5, -NRaRb, (NRaRb)alkyl, and (MeO)(HO)P(O)O-, and wherein any said cycloalkyl and heterocyclyl may optionally be fused onto an aromatic ring and may optionally be substituted with one or more substituents independently selected from alkyl, hydroxy!, halogen, aryl, -NRaRb, oxo, and -C(O)OR4;
R3 is hydrogen, alkyl, or arylalkyl;
R4 is alkyl or arylalkyl;
R5 is hydrogen, alkyl, or arylalkyl; Ra and Rb are independently selected from hydrogen, alkyl, cycloalkyl, arylalkyl, heteroaryl, -C(O)R^, -C(O)OR7, -C(0)NRcRd, and (NRcRd)alkyl} or alternatively, Ra and Rb, together with the nitrogen atom to which they are attached, form a five- or six-membered ring or bridged bicyclic ring structure, wherein said five- or six-membered ring or bridged bicyclic ring structure optionally may contain one or two additional heteroatoms independently selected from nitrogen, oxygen, and sulfur and may contain one, two, or three substituents independently selected from Cj to Cg alkyl, Cj to C4 haloalkyl, aryl, hydroxy!, C1 to Cg alkoxy, Cj to C4 haloalkoxy, and halogen;
R6 is alkyl; R7 is alkyl, arylalkyl, or haloalkyl; and
Rc and Rd are independently selected from hydrogen, alkyl, arylalkyl, and cycloalkyl.
In a fifteenth embodiment of the first aspect, the present disclosure provides a compound, or a pharmaceutically acceptable salt thereof, selected from the group consisting of:
(S)-tørt-butyl 2-(6-(4-(2-((S)- 1 -(ferϊ-butoxycarbonyl)pyrrolidin-2~yl)~ 1 H- imidazol-5~yl)phenyl)benzo[d]isoxazol-3-ylcarbamoyl)pyrrolidine-l-carboxylate;
(S)-N-(6-(4-(2-((S)-pyrrolidin-2-yl)-lH-imidazol-5- yl)phenyl)benzo[d]isoxazol-3-yl)pyrrolidine-2-carboxamide; (S)-l^(S)-2-methoxycarbonyl-3-methylbutanoyl)-N-(6-(4-(2-((S)-l-((S)-2- πxethoxycarbonyl-3-methylbutanoyl)pyrrolidin-2~yl)-lH-imidazol-5- yl)phenyl)benzo[d]isoxazol-3-yl)pyrrolidme-2-carboxamide;
(S)-N-(5-(4-(2-((S)-pyrrolidin-2-yl)-lH-imidazol-5- yl)phenyl)benzo[d]isoxazol-3-yl)pyrrolidine-2-carboxamide;
(S)4-((S)-2-methoxycarbonylaminopropanoyl)-N-(6-(4-(2-((S)-l-((S)-2- methoxycarbonylaminopropanoyl)ρyrrolidin-2-yl)-lH-imidazol-5- yl)phenyl)benzo[d] isoxazol-3 ~yl)pyrrolidme-2-carboxamide; tert-butyl 6-(4-(2"((S)-l-(terf-butoxycarbonyl)ρyrrolidin-2-yl)~lH-imidazol-5- yl)phenyl)-3 -((S)-I -(ferϊ-butoxycarbonyl)pyrrolidine-2-carboxamido)- 1 H-indazole- 1 - carboxylate;
(S)-N-(6-(4-(2-((S)-pyrrolidin-2-yl)-lH-imidazol-5-yl)phenyl)-lH-indazol-3- yl)pyrrolidine-2-carboxamide;
(S)- 1 -((S)-2-methoxycarbonylaminopropanoyl)-N-(6-(4-(2-((S)- 1 -((S>2- methoxycarbonylaminoprop anoyl)pyrrolidin-2-yl)- 1 H-imidazol- 5 -yl)phenyl)- 1 H- mdazol-3-yl)ρyrrolidine-2-carboxamide;
(S)-N-(5-(4-(2-((S)-pyrrolidin-2-yl)-lH-imidazol-5-yl)phenyl)-lH-indazol-3- yl)pyrrolidine-2-carboxamide ;
(S)4-((S)-2-methoxycarbonylaminopiopanoyl)-N-(5-(4-(2-((S)-l-((S)-2- methoxycarbonylaminopropanoyl)ρyrrolidin-2~yl)~ 1 H-imidazol-5-yl)phenyl)- 1 H- indazol-3-yl)pyrrolidine-2-carboxamide; and corresponding stereoisomers and tautoniers thereof.
In a sixteenth embodiment of the first aspect, the present disclosure provides a compound, or a pharmaceutically acceptable salt thereof, selected from the group consisting of:
Figure imgf000021_0001
Figure imgf000022_0001
Figure imgf000022_0002
Figure imgf000023_0001
Figure imgf000024_0001
Figure imgf000024_0002
Figure imgf000025_0001
Figure imgf000025_0002
Figure imgf000025_0003
corresponding stereoisomers and tautomers thereof.
In a second aspect the present disclosure provides a composition comprising a compound of Formula (I):
Figure imgf000026_0001
(I), or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier, wherein Formula (I) is defined according to any of the embodiments described above in the first aspect of the present disclosure.
In a first embodiment of the second aspect the composition further comprises at least one additional compound having anti-HCV activity.
In a second embodiment of the second aspect at least one of the additional compounds is an interferon or a ribavirin. In a third embodiment of the second aspect the interferon is selected from interferon alpha 2B, pegylated interferon alpha, consensus interferon, interferon alpha 2 A, and lymphoblastoid interferon tau.
In a fourth embodiment of the second aspect the present disclosure provides a composition comprising a compound of Formula (I), or a pharmaceutically acceptable salt thereof, a pharmaceutically acceptable carrier, and at least one additional compound having anti-HCV activity, wherein at least one of the additional compounds is selected from interleukin 2, interleukin 6, interleukin 12, a compound that enhances, the development of a type 1 helper T cell response, interfering RNA, anti-sense RNA, Imiqimod, ribavirin, an inosine 5'-monophospate dehydrogenase inhibitor, amantadine, and rimantadine.
In a fifth embodiment of the second aspect the present disclosure provides a composition comprising a compound of Formula (I), or a pharmaceutically acceptable salt thereof, a pharmaceutically acceptable carrier, and at least one additional compound having anti-HCV activity, wherein at least one of the additional compounds is effective to inhibit the function of a target selected from HCV metalloprotease, HCV serine protease, HCV polymerase, HCV helicase, HCV NS4B protein, HCV entry, HCV assembly, HCV egress, HCV NS5A protein, and IMPDH for the treatment of an HCV infection. In a third aspect the present disclosure provides a method of treating an HCV infection in a patient, comprising administering to the patient a therapeutically effective amount of a compound of Formula (I):
Figure imgf000027_0001
(I)> or a pharmaceutically acceptable salt thereof, wherein Formula (I) is defined according to any of the embodiments described above in the first aspect of the present disclosure.
In a first embodiment of the third aspect the method further comprises administering at least one additional compound having anti-HCV activity prior to, after or simultaneously with the compound of Formula (I)3 or a pharmaceutically acceptable salt thereof.
In a second embodiment of the third aspect at least one of the additional compounds is an interferon or a ribavirin. In a third embodiment of the third aspect the interferon is selected from interferon alpha 2B, pegylated interferon alpha, consensus interferon, interferon alpha
2A, and lymphoblastoid interferon tau.
In a fourth embodiment of the third aspect the present disclosure provides a method of treating an HCV infection in a patient, comprising administering to the patient a therapeutically effective amount of a compound of Formula (I), or a pharmaceutically acceptable salt thereof, and at least one additional compound having anti-HCV activity prior to, after or simultaneously with the compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein at least one of the additional compounds is selected from interleukin 2, interleukin 6, interleukin 12, a compound that enhances the development of a type 1 helper T cell response, interfering RNA, anti-sense RNA, Imiqimod, ribavirin, an inosine 5'-monophospate dehydrogenase inhibitor, amantadine, and rimantadine. In a fifth embodiment of the third aspect the present disclosure provides a method of treating an HCV infection in a patient, comprising administering to the patient a therapeutically effective amount of a compound of Formula (I), or a pharmaceutically acceptable salt thereof, and at least one additional compound having anti-HCV activity prior to, after or simultaneously with the compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein at least one of the additional compounds is effective to inhibit the function of a target selected from HCV metalloprotease, HCV serine protease, HCV polymerase, HCV helicase, HCV NS4B protein, HCV entry, HCV assembly, HCV egress, HCV NS 5 A protein, and IMPDH for the treatment of an HCV infection.
Other aspects of the present disclosure may include suitable combinations of embodiments disclosed herein.
Yet other aspects and embodiments may be found in the description provided herein. The description of the present disclosure herein should be construed in congruity with the laws and principals of chemical bonding. In some instances it may be necessary to remove a hydrogen atom in order to accommodate a substituent at any given location.
Certain features of the structure of Formula (I) are further illustrated below:
Figure imgf000028_0001
Pyrrolidine moiety Linker Pyrrolidine moiety (Left) (Right)
(I).
In Formula (I)5 as depicted above, the "pyrrolidine moiety" on the left side of the "linker" is independent from the "pyrrolidine moiety" on the right side of the linker group in respect of the substitution on the pyrrolidine nitrogen, i.e., R] and R2 are independent from each other, although in some circumstances they are preferably the same. It should be understood that the depiction of a pyrrolidine moiety on the "left" side or on the "right" side is for illustration purpose only, which does not in any way limit the scope of the disclosure.
In a pyrrolidine moiety on either side of the molecule, the stereogenic carbon center on the pyrrolidine ring can take either (R)- or (S)- configuration as illustrated below:
Figure imgf000029_0001
(R-) (S-)
Thus, this disclosure is intended to cover all possible stereoisomers even when a single stereoisomer, or no stereochemistry, is described in a structure.
In Formula (I), the linkage between the linker phenylene
Figure imgf000029_0002
group and the imidazole ring of the pyrrolidine moiety on the left side can take place in either the C-4 or the C-5 position (see below) of the imidazole ring. As a person of ordinary skill in the art would understand, due to tautomerization of the imidazole ring, a bonding of the phenylene group to the C-4 position may be equivalent to a bonding of the phenylene group to the C-5 position, as illustrated in the following equation:
Figure imgf000029_0003
Thus, this disclosure is intended to cover all possible tautomers even when a structure depicts only one of them.
Likewise, the linkage between the linker phenylene group and the pyrrolidine moiety on the right side can take place in any of the available positions, i.e., positions C-4, C-5, C-6, and C-7, on the heteroaryl group, as illustrated below:
Figure imgf000030_0001
However, linkage of the phenylene group to the C-5 or C-6 position is preferred.
In this disclosure, a floating bond (e.g. , ^ ) or a floating substituent (e.g. , — R* 3) on a structure indicates that the bond or substituent can attach to any available position of the structure by removal of a hydrogen from the available position. It should be understood that in a bicyclic or polycyclic ring structure, unless specifically defined otherwise, the position of a floating bond or a floating substituent does not limit the position of such bond or substituent to a specific ring. Thus, the following two substituents should be construed to be equivalent:
Figure imgf000030_0002
It should be understood that the compounds encompassed by the present disclosure are those that are suitably stable for use as pharmaceutical agent.
It is intended that the definition of any substituent or variable at a particular location in a molecule be independent of its definitions elsewhere in that molecule. For example, for substituent (R10)n, when n is 2, each of the two R10 groups may be the same or different.
All patents, patent applications, and literature references cited in the specification are herein incorporated by reference in their entirety. In the case of inconsistencies, the present disclosure, including definitions, will prevail.
DEFINITIONS
Definitions have been provided above for each of the groups defined. In addition, the following definitions shall be used.
As used herein, the singular forms "a", "an", and "the" include plural reference unless the context clearly dictates otherwise. Unless stated otherwise, all aryl, cycloalkyl, heteroaryl, and heterocyclyl groups of the present disclosure may be substituted as described in each of their respective definitions. For example, the aryl part of an arylalkyl group may be substituted as described in the definition of the term "aryl." The term "acetyl," as used herein, refers to -C(O)CH3.
The term "alkenyl," as used herein, refers to a monovalent, straight or branched hydrocarbon chain having one or more, preferably one to two, double bonds therein. The double bond of an alkenyl group can be unconjugated or conjugated to another unsaturated group. Suitable alkenyl groups include, but are not limited to, C2 to C10 alkenyl groups, such as vinyl, allyl, butenyl, pentenyl, hexenyl, butadienyl, pentadienyl, hexadienyl, 2-ethylhexenyI, 2-propyl-2-butenyl, 4-(2-methyl-3-butene)- pentenyl. An alkenyl group can be unsubstituted or substituted with one or two suitable substituents.
The term "alkoxy," as used herein, refers to an alkyl group attached to the parent molecular moiety through an oxygen atom. Representative examples of alkoxy group include, but are not limited to, methoxy (CH3O-), ethoxy (CH3CH2O-), and t-butoxy ((CH3)3CO-).
The term "alkyl," as used herein, refers to a group derived from a straight or branched chain saturated hydrocarbon containing from one to six carbon atoms. In the compounds of the present disclosure, when R30 and/or R3Ms alkyl, each alkyl can optionally form a fused three- to six-membered ring with an adjacent carbon atom to provide any of the structures shown below:
Figure imgf000031_0001
R1 and/or R2 ; or R1 and/or R2 wherein q is 1-4, or can optionally form a spirocyclic three- to six-membered ring with the carbon to which it is attached to provide the structure shown below:
Figure imgf000032_0001
Figure imgf000032_0002
r R2 ; R1 and/or R2 ; or R1 and/or R2 wherein q is 1-4.
The term "alkylcarbonyl," as used herein, refers to an alkyl group attached to the parent molecular moiety through a carbonyl group. Representative examples of alkylcarbonyl group include, but are not limited to, acetyl (-C(O)CH3), propanoyl
(-C(O)CH2CH3), n-butyryl (-C(O)CH2CH2CH3), and 2,2-dimethylpropanoyl or pivaloyl (-C(O)C(CH3)3).
The term "allyl," as used herein, refers to the -CH2CH=CH2 group.
The term "aryl," as used herein, refers to a group derived from an aromatic carbocycle by removal of a hydrogen atom from an aromatic ring. The aryl group can be monocyclic, bicyclic or polycyclic, wherein in bicyclic or polycyclic aryl group, the aromatic carbocycle can be fused onto another four- to six-membered aromatic or non-aromatic carbocycle. Representative examples of aryl groups include, but are not limited to, phenyl, indanyl, indenyl, naphthyl, and l,2,3,44etrahydronaphth-5-yl. The term "arylalkyl," as used herein, refers to an alkyl group substituted with one, two, or three aryl groups, wherein aryl part of the arylalkyl group may optionally be substituted by one to five substituents independently selected from C1 to Cg alkyl,
C1 to C4 haloalkyl, Cj to Cg alkoxy, halogen, cyano, and nitro groups. Represented examples of arylalkyl include, but are not limited to, benzyl, 2-phenyl-l -ethyl (PhCH2CH2-), (naphth- 1 -yl)methyl, and (naphth-2-yl)methyl.
The term "benzyl," as used herein, refers to a methyl group on which one of the hydrogen atoms is replaced by a phenyl group, wherein said phenyl group may optionally be substituted by one to five substituents independently selected from methyl, trifluoromethyl (-CF3), methoxy (-OCH3), halogen, and nitro (-NO2). Representative examples of benzyl group include, but are not limited to, PhCH2-, A- MeO-C6H4CH2-, and 2,4,6~tri-methyl~C6H4CHr . The term "bridged bicyclic ring," as used herein, refers to a ring structure comprising a bridgehead between two of the ring members, wherein the ring and the bridgehead optionally may independently comprise one or more, preferably one to two, heteroatoms independently selected from nitrogen, oxygen, and sulfur. Illustrated examples of a bridged bicyclic ring structure include, but are not limited to:
Figure imgf000033_0001
The terms "Cap" and "cap," as used herein, refer to the group which is placed on the nitrogen atom of the pyrrolidine ring in the compounds of formula (I). It should be understood that "Cap" or "cap" can also refer to the reagent which is a precursor to the final "cap" in compounds of formula (I) and is used as one of the starting materials in the reaction to append a group on the pyrrolidine nitrogen that results in the final product, a compound which contains the functionalized pyrrolidine that will be present in the compound of formula (I). The term "carbonyl," as used herein, refers to -C(O)-.
The term "carboxyl," as used herein, refers to -CO2H.
The term "cyano," as used herein, refers to -CN.
The term "cycloalkyl," as used herein, refers to a group derived from a saturated carbocycle, having preferably three to eight carbon atoms, by removal of a hydrogen atom from the saturated carbocycle, wherein the saturated carbocycle can optionally be fused onto one or two other aromatic or nonaromatic carbocycles. Representative examples of cycloalkyl groups include, but are not limited to, cyclopropyl, cyclopentyl, cyclohexyl, and 1,2,3,4-tetrahydronaphth-l-yl.
The term "formyl," as used herein, refers to -CHO. The terms "halo" and "halogen," as used herein, refer to F, Cl, Br, or I.
The term "haloalkoxy," as used herein, refers to a haloalkyl group attached to the parent molecular moiety through an oxygen atom. The term "haloalkyl," as used herein, refers to an alkyl group substituted by at least one halogen atom. The haloalkyl group can be an alkyl group of which all hydrogen atoms are substituted by halogens. Representative examples of haloalkyl include, but are not limited to, trifiuoromethyl (CF3-), 1-chloroethyl (CICI^CH^-), and 2,2,2-trifluoroethyl (CF3CH2-).
The term "heteroaryl," as used herein, refers to group derived from a monocyclic, bicyclic, or polycyclic compound comprising at least one aromatic ring comprising one or more, preferably one to three, heteroatoms independently selected from nitrogen, oxygen, and sulfur, by removal of a hydrogen atom from an aromatic ring thereof. As is well known to those skilled in the art, heteroaryl rings have less aromatic character than their all-carbon counterparts. Thus, for the purposes of the disclosure, a heteroaryl group need only have some degree of aromatic character. Illustrative examples of heteroaryl groups include, but are not limited to, pyridyl, pyridazinyl, pyrimidyl, pyrazyl, triazinyl, pyrrolyl, pyrazolyl, imidazolyl, (1,2,3,)- and (l,2,4)-triazolyl, pyrazinyl, pyrimidinyl, tetrazolyl, furyl, thienyl, isoxazolyl, thiazolyl, isoxazolyl, oxazolyl, indolyl, quinolinyl, isoqumolmyl, benzisoxazolyl, benzothiazolyl, benzothienyl, and pyrrolopyridinyl.
The term "heteroarylalkyl," as used herein, refers to an alkyl group substituted with one, two, or three heteroaryl groups. The term "heterobicyclyl," as used herein, refers to a ring structure comprising two fused or bridged rings that include carbon and one or more, preferably one to three, heteroatoms independently selected from nitrogen, oxygen, and sulfur. The heterobicyclic ring structure is a subset of heterocyclic ring and can be saturated or unsaturated. Examples of heterobicyclic ring structures include, but are not limited to, tropane, quinuclidine, and 7-azabicyclo[2.2.1]heptane.
The term "heterocyclyl," as used herein, refers to a group derived from a monocyclic, bicyclic, or polycyclic compound comprising at least one nonaromatic ring comprising one or more, preferably one to three, heteroatoms independently selected from nitrogen, oxygen, and sulfur, by removal of a hydrogen atom from the nonaromatic ring. The heterocyclyl group encompasses the heterobicyclyl group. The heterocyclyl groups of the present disclosure can be attached to the parent molecular moiety through a carbon atom or a nitrogen atom in the group. Examples of heterocyclyl groups include, but are not limited to, morpholinyl, oxazolidinyl, piperazinyl, piperidinyl, pyrrolidinyl, tetrahydrofuryl, thiomorpholinyl, and indolinyl.
The term "heterocyclylalkyl," as used herein, refers to an alkyl group substituted with one, two, or three heterocyclyl groups.
The terms "hydroxy" or "hydroxyl," as used herein, refer to -OH.
The term "nitro," as used herein, refers to -NO2.
The term "-NRaRb," as used herein, refers to two groups, Ra and Rb, which are attached to the parent molecular moiety through a nitrogen atom, or alternatively Ra and Rb, together with the nitrogen atom to which they are attached, form a 5- or 6- membered ring or a fused- or bridged-bicyclic ring structure optionally containing one, two, or three additional heteroatom independently selected from nitrogen, oxygen, and sulfur. The term "-NRcRd" is defined similarly.
The term "(NRaRb)alkyl," as used herein, refers to an alkyl group substituted with one, two, or three -NRaRb groups. The term "(NRcRd)alkyl" is defined similarly.
The term "oxo," as used herein, refers to =0. The term "sulfonyl," as used herein, refers to -SO2-.
Asymmetric centers exist in the compounds of the present disclosure. These centers are designated by the symbols "R" or "S", depending on the configuration of substituents around the chiral carbon atom. It should be understood that the disclosure encompasses all stereochemical isomeric forms, or mixtures thereof, which possess the ability to inhibit NS5A. Individual stereoisomers of compounds can be prepared synthetically from commercially available starting materials which contain chiral centers or by preparation of mixtures of enantiomeric products followed by separation such as conversion to a mixture of diastereomers followed by separation or recrystalHzation, chromatographic techniques, or direct separation of enantiomers on chiral chromatographic columns. Starting compounds of particular stereochemistry are either commercially available or can be made and resolved by techniques known in the art. Certain compounds of the present disclosure may also exist in different stable conformational forms which may be separable. Torsional asymmetry due to restricted rotation about an asymmetric single bond, for example because of steric hindrance or ring strain, may permit separation of different conformers. The present disclosure includes each conformational isomer of these compounds and mixtures thereof.
The term "compounds of the present disclosure", and equivalent expressions, are meant to embrace compounds of Formula (I), and pharmaceutically acceptable enantiomers, diastereomers, and salts thereof. Similarly, references to intermediates are meant to embrace their salts where the context so permits. The present disclosure is intended to include all isotopes of atoms occurring in the present compounds. Isotopes include those atoms having the same atomic number but different mass numbers. By way of general example and without limitation, isotopes of hydrogen include deuterium and tritium. Isotopes of carbon include '3C and 14C. Isotopically-labeled compounds of the invention can generally be prepared by conventional techniques known to those skilled in the art or by processes analogous to those described herein, using an appropriate isotopically-labeled reagent in place of the non-labeled reagent otherwise employed. Such compounds may have a variety of potential uses, for example as standards and reagents in determining biological activity. In the case of stable isotopes, such compounds may have the potential to favorably modify biological, pharmacological, or pharmacokinetic properties.
The compounds of the present disclosure can exist as pharmaceutically acceptable salts. The term "pharmaceutically acceptable salt," as used herein, represents salts or zwitterionic forms of the compounds of the present disclosure which are water or oil-soluble or dispersible, which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of patients without excessive toxicity, irritation, allergic response, or other problem or complication commensurate with a reasonable benefit/risk ratio, and are effective for their intended use. The salts can be prepared during the final isolation and purification of the compounds or separately by reacting a suitable nitrogen atom with a suitable acid. Representative acid addition salts include acetate, adipate, alginate, citrate, aspartate, benzoate, benzenesulfonate, bisulfate, butyrate, camphorate, camphorsulfonate; digluconate, glycerophosphate, hemisulfate, heptanoate, hexanoate, formate, fumarate, hydrochloride, hydrobromide, hydroiodide, 2-hydroxyethanesulfonate, lactate, maleate, mesitylenesulfonate, methanesuifonate, naphthylenesulfonate, nicotinate, 2-naphthalenesulfonate, oxalate, palmoate, pectinate, persulfate, 3- phenylproprionate, picrate, pivalate, propionate, succinate, tartrate, trichloroacetate, trifluoroacetate, phosphate, glutamate, bicarbonate, para-toluenesulfonate, and undecanoate. Examples of acids which can be employed to form pharmaceutically acceptable addition salts include inorganic acids such as hydrochloric, hydrobromic, sulfuric, and phosphoric, and organic acids such as oxalic, maleic, succinic, and citric. Basic addition salts can be prepared during the final isolation and purification of the compounds by reacting a carboxy group with a suitable base such as the hydroxide, carbonate, or bicarbonate of a metal cation or with ammonia or an organic primary, secondary, or tertiary amine. The cations of pharmaceutically acceptable salts include lithium, sodium, potassium, calcium, magnesium, and aluminum, as well as nontoxic quaternary amine cations such as ammonium, tetramethylammonium, tetraethylammonium, methylamme, dimethylamine, trimethylamine, triethylamine, diethylamine, ethylamine, tributylamine, pyridine, N,N-dimethylaniline, N- methylpiperidine, N-methylmorpholine, dicyclohexylamine, procaine, dibenzylamine, N,N-dibenzylphenethylamine, and N,N'-dibenzylethylenediamine. Other representative organic amines useful for the formation of base addition salts include ethylenediamine, ethanolamine, diethanolamine, piperidine, and piperazine.
When it is possible that, for use in therapy, therapeutically effective amounts of a compound of Formula (I), as well as pharmaceutically acceptable salts thereof, may be administered as the raw chemical, it is possible to present the active ingredient as a pharmaceutical composition. Accordingly, the disclosure further provides pharmaceutical compositions, which include therapeutically effective amounts of compounds of Formula (I) or pharmaceutically acceptable salts thereof, and one or more, preferably one to three, pharmaceutically acceptable carriers, diluents, or excipients. The term "therapeutically effective amount," as used herein, refers to the total amount of each active component that is sufficient to show a meaningful patient benefit, e.g., a sustained reduction in viral load. When applied to an individual active ingredient, administered alone, the term refers to that ingredient alone. When applied to a combination, the term refers to combined amounts of the active ingredients that result in the therapeutic effect, whether administered in combination, serially, or simultaneously. The compounds of Formula (I) and pharmaceutically acceptable salts thereof, are as described above. The carrier(s), diluent(s), or excipient(s) must be acceptable in the sense of being compatible with the other ingredients of the formulation and not deleterious to the recipient thereof. In accordance with another aspect of the present disclosure there is also provided a process for the preparation of a pharmaceutical formulation including admixing a compound of Formula (I), or a pharmaceutically acceptable salt thereof, with one or more, preferably one to three, pharmaceutically acceptable carriers, diluents, or excipients. The term
"pharmaceutically acceptable," as used herein, refers to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of patients without excessive toxicity, irritation, allergic response, or other problem or complication commensurate with a reasonable benefit/risk ratio, and are effective for their intended use.
Pharmaceutical formulations may be presented in unit dose forms containing a predetermined amount of active ingredient per unit dose. Dosage levels of between about 0.01 and about 250 milligram per kilogram ("mg/kg") body weight per day, preferably between about 0.05 and about 100 mg/kg body weight per day of the compounds of the present disclosure are typical in a monotherapy for the prevention and treatment of HCV mediated disease. Typically, the pharmaceutical compositions of this disclosure will be administered from about 1 to about 5 times per day or alternatively, as a continuous infusion. Such administration can be used as a chronic or acute therapy. The amount of active ingredient that may be combined with the carrier materials to produce a single dosage form will vary depending on the condition being treated, the severity of the condition, the time of administration, the route of administration, the rate of excretion of the compound employed, the duration of treatment, and the age, gender, weight, and condition of the patient. Preferred unit dosage formulations are those containing a daily dose or sub-dose, as herein above recited, or an appropriate fraction thereof, of an active ingredient. Generally, treatment is initiated with small dosages substantially less than the optimum dose of the compound. Thereafter, the dosage is increased by small increments until the optimum effect under the circumstances is reached, hi general, the compound is most desirably administered at a concentration level that will generally afford antivirally effective results without causing any harmful or deleterious side effects.
When the compositions of this disclosure comprise a combination of a compound of the present disclosure and one or more additional therapeutic or prophylactic agent, both the compound and the additional agent are usually present at dosage levels of between about 10 to 150%, and more preferably between about 10 and 80% of the dosage normally administered in a monotherapy regimen,
Pharmaceutical formulations may be adapted for administration by any appropriate route, for example by the oral (including buccal or sublingual), rectal, nasal, topical (including buccal, sublingual, or transdermal), vaginal, or parenteral (including subcutaneous, intracutaneous, intramuscular, mtra-articular, intrasynovial, intrasternal, intrathecal, intralesional, intravenous, or intradermal injections or infusions) route. Such formulations may be prepared by any method known in the art of pharmacy, for example by bringing into association the active ingredient with the carrier(s) or excipient(s). Oral administration or administration by injection are preferred.
Pharmaceutical formulations adapted for oral administration may be presented as discrete units such as capsules or tablets; powders or granules; solutions or suspensions in aqueous or non-aqueous liquids; edible foams or whips; or oil-in-water liquid emulsions or water-in-oil emulsions.
For instance, for oral administration in the form of a tablet or capsule, the active drug component can be combined with an oral, non-toxic pharmaceutically acceptable inert carrier such as ethanol, glycerol, water, and the like. Powders are prepared by comminuting the compound to a suitable fine size and mixing with a similarly comminuted pharmaceutical carrier such as an edible carbohydrate, as, for example, starch or mannitol. Flavoring, preservative, dispersing, and coloring agent can also be present.
Capsules are made by preparing a powder mixture, as described above, and filling formed gelatin sheaths. Glidants and lubricants such as colloidal silica, talc, magnesium stearate, calcium stearate, or solid polyethylene glycol can be added to the powder mixture before the filling operation. A disintegrating or solubilizing agent such as agar-agar, calcium carbonate, or sodium carbonate can also be added to improve the availability of the medicament when the capsule is ingested. Moreover, when desired or necessary, suitable binders, lubricants, disintegrating agents, and coloring agents can also be incorporated into the mixture. Suitable binders include starch, gelatin, natural sugars such as glucose or beta-lactose, corn sweeteners, natural and synthetic gums such as acacia, tragacanth or sodium alginate, carboxymethylcellulose, polyethylene glycol, and the like. Lubricants used in these dosage forms include sodium oleate, sodium chloride, and the like. Disintegrators include, without limitation, starch, methyl cellulose, agar, betonite, xanthan gum, and the like. Tablets are formulated, for example, by preparing a powder mixture, granulating or slugging, adding a lubricant and disintegrant, and pressing into tablets. A powder mixture is prepared by mixing the compound, suitable comminuted, with a diluent or base as described above, and optionally, with a binder such as carboxymethylceliulose, an aliginate, gelating, or polyvinyl pyrrolidone, a solution retardant such as paraffin, a resorption accelerator such as a quaternary salt and/or and absorption agent such as betonite, kaolin, or dicalcium phosphate. The powder mixture can be granulated by wetting with a binder such as syrup, starch paste, acadia mucilage, or solutions of cellulosic or polymeric materials and forcing through a screen. As an alternative to granulating, the powder mixture can be run through the tablet machine and the result is imperfectly formed slugs broken into granules. The granules can be lubricated to prevent sticking to the tablet forming dies by means of the addition of stearic acid, a stearate salt, talc, or mineral oil. The lubricated mixture is then compressed into tablets. The compounds of the present disclosure can also be combined with a free flowing inert carrier and compressed into tablets directly without going through the granulating or slugging steps. A clear or opaque protective coating consisting of a sealing coat of shellac, a coating of sugar or polymeric material, and a polish coating of wax can be provided. Dyestuffs can be added to these coatings to distinguish different unit dosages.
Oral fluids such as solution, syrups, and elixirs can be prepared in dosage unit form so that a given quantity contains a predetermined amount of the compound. Syrups can be prepared by dissolving the compound in a suitably flavored aqueous solution, while elixirs are prepared through the use of a non-toxic vehicle. Solubilizers and emulsifiers such as ethoxylated isostearyl alcohols and polyoxyethylene sorbitol ethers, preservatives, flavor additive such as peppermint oil or natural sweeteners, or saccharin or other artificial sweeteners, and the like can also be added. Where appropriate, dosage unit formulations for oral administration can be microencapsulated. The formulation can also be prepared to prolong or sustain the release as for example by coating or embedding particulate material in polymers, wax, or the like.
The compounds of Formula (I), and pharmaceutically acceptable salts thereof, can also be administered in the form of liposome delivery systems, such as small unilamellar vesicles, large unilamellar vesicles, and multilamellar vesicles. Liposomes can be formed from a variety of phospholipids, such as cholesterol, stearylamine, or phosphatidylcholines.
The compounds of Formula (I) and pharmaceutically acceptable salts thereof may also be delivered by the use of monoclonal antibodies as individual carriers to which the compound molecules are coupled. The compounds may also be coupled with soluble polymers as targetable drug carriers. Such polymers can include polyvinylpyrrolidone, pyran copolymer, polyhydroxypropylmethacrylamidephenol, polyhydroxyethylaspartamidephenol, or polyethyleneoxidepolylysine substituted with palitoyl residues. Furthermore, the compounds may be coupled to a class of biodegradable polymers useful in achieving controlled release of a drag, for example, polylactic acid, polepsilon caprolactone, polyhydroxy butyric acid, polyorthoesters, polyacetals, polydihydropyrans, polycyanoacrylates, and cross-linked or amphipathic block copolymers of hydrogels. Pharmaceutical formulations adapted for transdermal administration may be presented as discrete patches intended to remain in intimate contact with the epidermis of the recipient for a prolonged period of time. For example, the active ingredient may be delivered from the patch by iontophoresis as generally described in Pharm. Res., 3(6):318 (1986). Pharmaceutical formulations adapted for topical administration may be formulated as ointments, creams, suspensions, lotions, powders, solutions, pastes, gels, sprays, aerosols, or oils. For treatments of the eye or other external tissues, for example mouth and skin, the formulations are preferably applied as a topical ointment or cream. When formulated in an ointment, the active ingredient may be employed with either a paraffmic or a water-miscible ointment base. Alternatively, the active ingredient may be formulated in a cream with an oil-in- water cream base or a water-in oil base.
Pharmaceutical formulations adapted for topical administrations to the eye include eye drops wherein the active ingredient is dissolved or suspended in a suitable carrier, especially an aqueous solvent.
Pharmaceutical formulations adapted for topical administration in the mouth include lozenges, pastilles, and mouth washes.
Pharmaceutical formulations adapted for rectal administration may be presented as suppositories or as enemas.
Pharmaceutical formulations adapted for nasal administration wherein the carrier is a solid include a course powder having a particle size for example in the range 20 to 500 microns which is administered in the manner in which snuff is taken, i.e., by rapid inhalation through the nasal passage from a container of the powder held close up to the nose. Suitable formulations wherein the carrier is a liquid, for administration as a nasal spray or nasal drops, include aqueous or oil solutions of the active ingredient. Pharmaceutical formulations adapted for administration by inhalation include fine particle dusts or mists, which may be generated by means of various types of metered, dose pressurized aerosols, nebulizers, or insufflators.
Pharmaceutical formulations adapted for vaginal administration may be presented as pessaries, tampons, creams, gels, pastes, foams, or spray formulations. Pharmaceutical formulations adapted for parenteral administration include aqueous and non-aqueous sterile injection solutions which may contain anti -oxidants, buffers, bacteriostats, and soutes which render the formulation isotonic with the blood of the intended recipient; and aqueous and non-aqueous sterile suspensions which may include suspending agents and thickening agents. The formulations may be presented in unit-dose or multi-dose containers, for example sealed ampoules and vials, and may be stored in a freeze-dried (lyophilized) condition requiring only the addition of the sterile liquid carrier, for example water for injections, immediately prior to use. Extemporaneous injection solutions and suspensions may be prepared from sterile powders, granules, and tablets.
It should be understood that in addition to the ingredients particularly mentioned above, the formulations may include other agents conventional in the art having regard to the type of formulation in question, for example those suitable for oral administration may include flavoring agents.
The term "patient" includes both human and other mammals. The term "treating" refers to: (i) preventing a disease, disorder or condition from occurring in a patient that may be predisposed to the disease, disorder, and/or condition but has not yet been diagnosed as having it; (ii) inhibiting the disease, disorder, or condition, i.e., arresting its development; and (iii) relieving the disease, disorder, or condition, i.e., causing regression of the disease, disorder, and/or condition.
The compounds of the present disclosure can also be administered with a cyclosporin, for example, cyclosporin A. Cyclosporin A has been shown to be active against HCV in clinical trials (Hepatology, 38:1282 (2003); Biochem. Biophys. Res. Commun., 313:42 (2004); J Gastroenterol, 38:567 (2003)).
Table 1 below lists some illustrative examples of compounds that can be administered with the compounds of this disclosure. The compounds of the disclosure can be administered with other anti-HC V activity compounds in combination therapy, either jointly or separately, or by combining the compounds into a composition,
Table 1
Figure imgf000043_0001
Figure imgf000044_0001
Figure imgf000045_0001
Figure imgf000046_0001
Figure imgf000047_0001
Figure imgf000048_0001
Figure imgf000049_0001
Figure imgf000050_0001
The compounds of the present disclosure may also be used as laboratory reagents. Compounds may be instrumental in providing research tools for designing of viral replication assays, validation of animal assay systems and structural biology studies to further enhance knowledge of the HCV disease mechanisms. Further, the compounds of the present disclosure are useful in establishing or determining the binding site of other antiviral compounds, for example, by competitive inhibition.
The compounds of this disclosure may also be used to treat or prevent viral contamination of materials and therefore reduce the risk of viral infection of laboratory or medical personnel or patients who come in contact with such materials, e.g., blood, tissue, surgical instruments and garments, laboratory instruments and garments, and blood collection or transfusion apparatuses and materials.
This disclosure is intended to encompass compounds having Formula (I) when prepared by synthetic processes or by metabolic processes including those occurring in the human or animal body (in vivo) or processes occurring in vitro.
The abbreviations used in the present application, including particularly in the illustrative examples which follow, are well-known to those skilled in the art. Some of the abbreviations used are as follows: Me - methyl
Et = ethyl t-Bu = tert-butyl iPr = isopropyl min = minutes rt or RT = room temperature or retention time (context will dictate)
TFA = trifluoroacetic acid h or hr — hours
DMSO = dimethylsulfoxide
DME = dimethyl ether LDA = Lithium diisopropylamide
NBS = N-Bromosuccinimide
SEM-Cl = 2-(Trimethylsilyl)ethoxymethyl chloride
TBAF - tetrabutylammonium fluoride
HATU - O-(7-azabenzotriazol-l-yl)-N,N,Nf,N'-tetramethyluronium hexafluorophosphate iP^EtN == diisopropylethylamine
DIEA = diisopropylethylamine
DIPEA = diisopropylethylamine
Hunig's = diisopropylethylamine Boc or BOC - tert-butoxycarbonyl
DMAP - 4-dimethylaminopyridine
HCl - hydrochloric acid Na2SO4 — sodium sulfate MgSO4 = magnesium sulfate
PdCl2(PPh3)2 - bis(triphenylphosphine)palladium(II)dichloride; MCX cartridge = WATERS-OASIS® MCX LP extraction cartridge
The present disclosure will now be described in connection with certain embodiments which are not intended to limit its scope. On the contrary, the present disclosure covers all alternatives, modifications, and equivalents as can be included within the scope of the claims. Thus, the following examples, which include specific embodiments, will illustrate one practice of the present disclosure, it being understood that the examples are for the purposes of illustration of certain embodiments and are presented to provide what is believed to be the most useful and readily understood description of its procedures and conceptual aspects.
Starting materials can be obtained from commercial sources or prepared by well- established literature methods known to those of ordinary skill in the art.
EXAMPLES AND METHOD OF PREPARATION Purity assessment and low resolution mass analysis were conducted on a Shimadzu LC system coupled with Waters MICROMAS S® ZQ MS system.
Scheme 1 (for the preparation of Examples 1 to 8)
Figure imgf000053_0001
3 CF3CO2H
Figure imgf000053_0002
EXAMPLE 1
6-Bromobenzo [d] isoxazol- 3 -amine
Figure imgf000054_0001
The title compound was prepared according Io the literature procedure as described in Palermo, M.G., Tetrahedron Lett., 37:2885 (1996).
EXAMPLE 2
(S)-ferf-Butyl 2-(5-(4-(3-aminobenzo[d]isoxazol-ό-yl)ρhenyl)-lH-imidazol~2- yl)pyrrolidine- 1 -carboxylate
Figure imgf000054_0002
A mixture of 6-bromobenzo[d]isoxazol-3-amine (1.78 g, 8.36 mmol), (S)-terf- butyl 2-(5-(4-(4,4?5!5-tetramethyl-l,3,2-dioxaborolan-2-yl)phenyl)-lH-imidazol-2- yl)pyrrolidine-l-carboxylate (3.95 g, 8.99 mmol), Pd(Ph3P)4 (0.42 g, 0.364 mmol) and NaHCO3 (1.93 g, 23.0 mmol) was suspended in DME (60 mL) and H2O (20 mL) and the solution was degassed by evacuating and back-filling with N2 (repeated 5 times). The mixture was then heated at 700C overnight. LCMS indicated the reaction to be incomplete. A further portion Of Pd(Ph3P)4 (0.10 g, 0.087 mmol) was added and heating continued for a further 12 h. The cooled reaction mixture was poured into H2O/EtOAc and the layers separated. The aq layer was extracted with EtOAc (X2) and the combined org layers were washed (H2O, brine), then dried (Na2SO4) and concentrated. The residue was purified by BIOTAGE® (TLC 5:4.5:0.5 hexane:EtOAc:MeOH) solvent A was 1:1 hex:EtOAc and solvent B was 20% MeOH in EtOAc to afford a red-orange foam (1.0 g). This material was purified by prep HPLC (CH3CN-H2O-NH4OAc) giving a light yellow foam (404.4 mg, 11%). 1H NMR (400 MHz, DMSO-d6) δ 11.85 - 12.21 (m, IH), 7.85 (app t, J - 8.0, 8.6, 2H), 7.72 - 7.73 (m, 4H), 7.54 - 7.60 (m, 2H), 6.41 (s, 2H), 4.76 ~ 4.83 (m, IH), 3.54 (s, br, IH), 3.31 - 3.37 (m, IH5 partially obscured by H2O), 2.14 - 2.25 (m, IH), 1.79 - 2.04 (m, 3H), 1.40, 1.15 (s, 9H, rotamers). LCMS: Anal. Calcd. for C25H27N5O3:
445; found: 446 (M+H)+.
EXAMPLE 3
(S)-fert-Butyl 2-(6-(4-(2-((S)-l-(tert-butoxycarbonyl)pyrrolidii>2-yl)4H-imidazol-5- yl)phenyl)berizo[d]isoxazol-3-ylcarbamoyl)pyrrolidme-l-carboxylate
Figure imgf000055_0001
To a solution (S)-6-(4-(2-(pyτrolidin-2-yl)-lH-imidazol-5- yl)phenyl)benzo[d]isoxazol-3-amine (400 mg, 0.899 mmol) and (S)-l-(tert- butoxycarbonyl)pyrrolidine-2-carboxylic acid (235.7 mg, 1.10 mmol) in CH2Cl2 (4 mL) was added ethyl 2-ethoxyquinoline-l(2H)-carboxylate (EEDQ, 440.0 mg, 1.78 mmol) followed. After stirring for 12 h the mixture was treated with a further portion of EEDQ (400 mg, 1.62 mmol) and (S)-l-(fert-butoxycarbonyl)pyrrolidine-2- carboxylic acid (200 mg, 0.93 mmol). Stirring was continued a further 12 h and a third portion of reagents added (400mg EEDQ and 200 mg (S)-l-(tert- butoxycarbonyl)pyrrolidine-2 -carboxylic acid). After stirring a further 24h MeOH (8 mL) followed by 1Pr2NEt (0.4 mL) were and the mixture allowed to stir for 2h. The solvent was removed in vacuo and the residue was purified by prep HPLC (CH3CN- H2O-TFA) to give the TFA salt of the title compound as a light yellow glass (118.7 mg, 26%). 1H NMR (400 MHz, DMSO-d6) δ 14.6 (s, br, 2H)5 11.32, 1 1.25 (s, IH, rotamer), 8.18 - 8.22 (m, IH)5 8.06 - 8.14 (m, 2H)3 8.01 (d, app J - 8.1 Hz, 2H), 7.92 (app d, J = 8.1Hz, 2H), 7.77 - 7.80 (m, IH), 4.99 - 5.04 (m, IH), 4.42 - 4.46 (m, IH)9 3.56 - 3.61 (m, 2H, partially obscured by H2O)5 3.36 - 3.48 (m, 2H), 2.23 - 2.32 (m,
2H)5 1.81 - 2.02 (m5 6H), 1.41, 1.31, 1.17 (s, 9H, rotamers 1:1:1 ratio). LCMS: Anal. Calcd. for C35H42N6O6: 642; found: 643 (M+H)+. EXAMPLE 4
(S)-N-(6-(4-(2-((S)-PyrrolidiB-2-yl)-lH-imidazol-5-yl)phenyl)benzo[d]isoxazol-3- yl)pyrrolidine-2-carboxamide trifluoroacetic acid salt
Figure imgf000056_0001
A solution of (S)-tert-butyl 2-(6-(4-(2-((S)-I -(fert-butoxycarbonyl)pyrrolidin-
2-yl)- 1 H-imidazol-5-yl)phenyl)benzo[d]isoxazol-3-ylcarbamoyl)ρyrrolidine- 1 - carboxylate (0.115 mg, 0.178 tnmol) in CH2Cl2 (3 niL) was treated with TFA (1 mL) and the solution was allowed to stir at it for 2 h. The solvents were removed in vacuo and the residue was purified by prep HPLC (CH3CN-H2O-TFA) to give the TFA salt of the title compound (74.8 mg, 53%) as a colorless glass. 1H NMR (400 MHz,
DMSOd6) 5 11.78 (s, IH), 9.53 ~ 9.58 (m, IH), 9.30 - 9.36 (m, IH), 8.97 - 9.04 (m,
IH)9 8.79 - 8.84 (m, IH), 8.10 (d, J - 8.6 Hz, IH), 8.06 (s,lH), 7.93 (AB doublet of AB quartet 2H), 7.86 (AB doublet of AB quartet 2H), 7.78 - 7.83 (m, IH), 4.73 - 4.78 (m, 2H), 4.51 - 4.54 (m, 2H)5 3.28 - 3.38 (m, 4H)5 1.95 - 2.22 (m, 6H). LCMS: Anal. Calcd. for C25H26N6O2: 442; found: 443 (MH-H)+.
EXAMPLE 5 (S)- 1 -((S)-2-Methoxycarbonyl-3-methylbutanoyl)-N-(6-(4-(2-((S> 1 -((S)-2- methoxycarbonyl-3 -methylbutanoyl)pyrrolidin-2-yl) - 1 H-imidazol- 5 - yl)phenyl)benzo[d] isoxazol-3 -yl)pyrrolidine-2-carboxamide
Figure imgf000056_0002
To a solution of the TFA salt of (S)-N-(6-(4-(2-((S)-pyrrolidin-2-yl)-lH- imidazol-5-yl)phenyl)benzo[d]isoxazol-3-yl)pyrrolidine-2-carboxamide (36 mg, 0.042 mmol), (S)-2-(methoxycarbonylamino)-3-methylbutanoic acid (19.3 mg, 0.11 mmol) and iPr2NEt (0.08 mL, 0.46 mmol) in DMF (4 mL) was added HATU (42.0 mg, 0.11 mmol) and the reaction was allowed to stir at rt for 2 h. The reaction mixture was purified by prep HPLC (CH3CN-H2O-NH4OAc) followed by prep HPLC (CH3CN-
H2O-TFA) and a final prep HPLC (CH3CN-H2O-NH4OAc) to give the title compound (18.1 mg, 52%) as a colorless solid. 1H NMR (400 MHz, DMSO~d6) δ 12.25, 12.09, 11.82 (s, IH, rotamers, 0.15:0.15:0.7 ratio), 11.25 (s, IH), 8.01 (d, J = 8.6 Hz, IH), 7.97 (s, IH), 7.66 - 7.86 (m, 5H), 7.56 (d, J - 2.1 Hz, IH), 7.38 (d, J = 8.1 Hz, IH), 7.28 (d} J - 8.6 Hz, IH), 5.06 - 5.09 (m, IH), 4.62 (s, br, IH), 4.03 - 4.10 (m, 3H)5 3.79 - 3.89 (m, H), 3.64 - 3.70 (m, IH), 3.53 (s, 6H)9 2.23 - 2.32 (m, IH), 2.05 ~~ 2.18 (m, 2H), 1.90 - 2.05 (m, 6H), 0.84 - 0.96 (m, 12H). LCMS: Anal. Calcd. for C39H48N8O8: 756; found: 757 (M+H)+.
EXAMPLES 6 TO 8 Examples 6 to 8 were prepared from Example 4 and the appropriate acids according to the procedure described for the preparation of Example 5.
Figure imgf000057_0001
Scheme 2 (used for the preparation of Examples 9 to 17)
Figure imgf000058_0001
2) TFA / CH2Cl2
Figure imgf000058_0002
EXAMPLE 9 5 -Bromobenzo[d] isoxazol-3-amine
Figure imgf000058_0003
The title compound was prepared by a modification of the literature procedure as described in Palermo, M. G., Tetrahedron Lett, 37:2885 (1996). A single neck 50 mL flask equipped with a magnetic stirred was charged with N-hydroxyacetamide (2.63 g, 35.0 mmol) and DMF (100 mL). Then, KOtBu (3.93 g, 35.0 mmol) was added in one portion. The temperature rose to 300C. The mixture was stirred for Ih and, 5-bromo~2-fluorobenzonitrile (7 g, 35.0 mmol) was added. The reaction mixture was stirred for overnight. A further portion of KOtBu (1.96 g, 17.5mmo) was added and the solution was again stirred overnight. The mixture was poured into brine and CH2CI2 and the layers were separated. The organic phase was dried (Na2SO4) and concentrated in vacuo. The residue was purified by flash column chromatography (BIOTAGE®, eluting with a gradient of 0 to 40% EtOAc in hexanes) to afford the title compound (4.59 g, 62%) as a colorless solid. 1H NMR (500 MHz, DMSOd6) δ 8.09 (d, J = 1.8 HZ, IH), 7.65 (dd, J = 2.1, 8.9 Hz, IH), 7.45 (d, J = 8.9 Hz5 IH), 6.49 (s, 2H). LCMS: Anal. Calcd. for C7H5BrN2O: 2115 213; found: 212, 214 (M+H)+.
EXAMPLE 10
(S)-tert-Butyl 2-(5-bromobenzo[d]isoxazol-3-ylcarbamoyl)pyrrolidine-l-carboxylate
Figure imgf000059_0001
A solution of 5-bromobenzo[d]isoxazol-3-amine (4.59 g, 21.6 mmol), (S)-I-
(tert-butoxycarbonyl)pyrrolidine-2-carboxylic acid (9.28 g, 43.1 mmol) and EEDQ (11.19 g, 45.2 mmol) in CH2Cl2 (80 mL) was stirred for 5h at 500C. LCMS analysis showed the reaction to be incomplete so it was heated for an additional 6h at 700C. A further one eq each of EEDQ and (S)- 1 -(terf~butoxycarbonyl)pyrrolidine-2-carboxylic acid were added and the mixture was stirred overnight at 6O0C. The reaction mixture was poured into sat. aq. NaHC O 3 and the layers were separated. The organic layer was washed (IM HCl, brine) dried (Na2SO4) and concentrated in vacuo. The resulting orange oil was purified by flash column chromatography (BIOTAGE®, eluting a gradient of 0 to 50% EtOAc in hexanes) to afford the title (6.80 g, 77 % yield) compound as a yellow oil 1H NMR (500 MHz, CD3OD) δ 8.22 (m, IH), 7.70 (m, IH), 7.51 (m, IH), 4.43 - 4.48 (m, IH), 3.56 - 3.61 (m, IH), 3.46 - 3.51 (m, IH), 2.30 - 2.42 (m, IH), 2.03 - 2.11 (m, 2H), 1.90 - 1.94 (m, IH), 1.48, 1.38 (s, 9H). LCMS: Anal. Calcd. for C17H20BrN3O4: 409, 411 ; found: 408, 410 (M-H)+. EXAMPLE I l
(S)-N-(5-(4-(2-((S)-Pyrrolidin-2-yl)-lH-imidazol-5-yl)phenyl)benzo[d]isoxazol-3- yl)pyrrolidine-2-carboxamide
Figure imgf000060_0001
Step 1. A mixture of (S)-te^butyl 2-(5~bromobenzo[d]isoxazol-3» ylcarbamoyi)pyrrolidine-l -carboxylate (2.25 g, 5.48 mmol), (S)-tert-butyl 2-(5-(4- (4,4,5,5-tetramethyl- 1 ,3,2~dioxaborolan-2-yl)phenyl)- 1 H-imidazol-2-yl)pyrrolidine-l - carboxylate (2.41 g, 5.48 mmol) and NaHCO3 (1.61 g, 19.20 mmol) DME (30 mL) and H2O (10 mL) was degassed under vacuum at O0C then, purged with N2 through the solution. To this mixture was added tetrakis(triphenylphosphine)palladium(0) (0.317 g, 0.274 mmol). The reaction mixture was separated into three 20 mL microwave vials and heated 130 0C for 3h (Emrys Optimizer, Personal Chemistry). The DME was removed in vacuo and the crude material was partitioned between EtOAc/H2O. The layers were separated and the aqueous layer was extracted several times with EtOAc. The combined organic extracts were dried over Na2SO4 and evaporated in vacuo. The residue was purified by flash column chromatography (BIOTAGE®), eluting with a gradient of 0 to 100% EtOAc/Hexanes and then 0 to 10 % methanol/DCM. The resulting yellow oil was then purified by prep HPLC (CH3CN-H2O-TFA) to afford The TFA salt of (S)-fert-butyl 2-(5-(4-(2-((S)-l-(tert- butoxycarbonyl)pyrrolidin~2-yl)-lH-imidazol-5-yl)phenyl)benzo[d]isoxazol-3- ylcarbamoyl)pyrrolidine- 1 -carboxylate (780 mg, 19 %) as a tan solid. LCMS: Anal. Calcd. for C35H42N6O6: 642; found: 643 (M+H)+.
Step 2. To a solution of (S)-fert-butyl 2-(5-(4-(2-((S)-l-(terf- butoxycarbonyl)pyrrolidin-2-yl)-lH-imidazol-5-yl)phenyl)benzo[d]isoxazol-3- ylcarbamoyl)pyrrolidine-l -carboxylate (TFA salt 400 mg, 0.622 mmol) in DCM (5 mL) was added TFA (2 ml, 26.0 mmol) and the reaction mixture was stirred for 3h at room temp. The solvents were removed in vacuo and the residue was taken up in 10 % Methanol/CH2C12 and filtered through an MCX cartridge (Strata XC). The cartridge was washed with methanol and the compound was eluted with a solution of NH3 in methanol (2M). The appropriate fractions were concentrated in vacuo to afford the title compound (248 mg, 0.560 mmol, 90 % yield) as yellow solid. 1H NMR (500 MHz, CD3OD) δ 8.31 (s, IH), 7.93 (dd, J - 1.8, 8.9 Hz5 IH), 7.83 (app d,
J = 8.5 Hz, 2H), 7.68 (app d, J = 8.5 Hz, 2H), 7.65 (d, J = 8.5 Hz, IH), 7.50 (s, IH), 4.74 (t, J - 7.9 Hz, IH), 4.37 (s, br, IH), 3.42 - 3.47 (m, IH), 3.32 - 3.38 (m, 2H), 3.22 - 3.27 (m, IH), 2.43 - 2.51 (m, 2H)5 2.30 - 2.37 (m, IH), 2.20 - 2.27 (m, IH), 2.09 - 2.18 (m, 2H)5 1.98 - 2.05 (m, IH). LCMS: Anal. Calcd. for C25H26N6O2: 442; found: 443 (M+H)+.
EXAMPLE 12 (S)- 1 -((S>2-Methoxycarbonylaminopropanoyl)-N-(6-(4-(2-((S)- 1 -((S)-2- methoxycarbonylaminopropanoyl)pyrrolidin-2-yl)- 1 H-imidazol-5- yl)phenyl)benzo[d] isoxazol-3 -yl)pyrroIidine-2-carboxamide
Figure imgf000061_0001
To a solution of (S)-N-(5-(4-(2-((S)-pyrrolidin-2-yI)-lH-imidazol-5- yl)phenyl)benzo[d]isoxazol-3-yl)pyrrolidine-2-carboxamide (50 mg, 0.11 mmol), (S)- 2-(methoxycarbonylamino)-propanoic acid (41.6 mg, 0.282 mmol) and iPr2NEt (0.197 niL, 1.13 mmol) in DMF (2 mL) was added HATU (107 mg, 0.282 mmol). The reaction mixture was stirred overnight at RT. Methanol (ca 0.5 mL) was added and the mixture was stirred for Ih. The mixture was diluted with EtOAc and H2O5 the phases were separated and the aq phase was extracted (X2) with EtOAc. The combined organic layers were evaporated in vacuo and the residue was purified by prep HPLC (CH3CN-H2O-TFA). The fractions containing the desired material were absorbed onto an MCX cation exchange cartridge. The resin was washed with MeOH and the desired material was released by elution with NH3 in MeOH (2M). The solvents were removed in vacuo and the crude product was purified prep HPLC (CH3CN-H2O-NH4OAc) to afford the title compound (27.10 mg, 34 % yield) as a white solid. 1H NMR (500 MHz, CD3OD) δ 8.22 (d, J = 1.2 Hz, IH), 7.91 (dd, J - 1.8, 8.5 Hz, IH), 7.83 (d, J = 8.3 Hz, IH), 7.75 (app d, J = 8.2 Hz, 2H), 7.63 - 7.67 (m, 3H), 7.32 (s, IH), 5.18 - 5.21 (m, IH), 4.74 (s, br, IH), 4.48 (AB quartet, J - 7.0 Hz, 2H), 3.86 - 3.91 (m, 2H) , 3.74 - 3.72 (m, IH), 3.64 (s, 3H), 3.63 (s, 3H)5 3.57 (s, IH), 2.12 - 2.39 (m, 2H), 2.05 - 2.21 (m, 6H), 1.36 (d, J = 7.0 Hz, 3H), 1.32 (d, J = 7.0 Hz, 3H). LCMS: Anal. Calcd. for C35H40N8O8: 700; found: 701 (M+H)+.
EXAMPLES 13 TO 17
Examples 13 to 17 were prepared from Example 11 and the appropriate acids according to the procedure described for the preparation of Example 12.
Figure imgf000062_0001
for
for for
Figure imgf000063_0001
Scheme 3 (used for the preparation of Examples 18-25)
Figure imgf000064_0001
Figure imgf000064_0002
Figure imgf000064_0003
Figure imgf000064_0004
4 CF3CO2H
Figure imgf000064_0005
EXAMPLE 18 tert-Butyl 3 -amino-6-bromo- 1 H-indazole- 1 -carboxylate
Figure imgf000065_0001
To a solution of 6-bromo-lH-indazol-3-amine (3.05 g, 14.4 mmol) in THF (60 niL) rt was added BOC2O (3.15 g, 14.4 mmol) and the mixture was allowed to stir at rt. After 2h the reaction showed only starting material by LCMS. A crystal of DMAP (ca. 40 mg) was added and stirring continued for 48 h. A further 400 mg (1.83 mmol) of BOC2O was added and stirring allowed to continue for 2h. The solvent was removed in vacuo and the residue was purified by BIOTAGE® using a gradient of 20 to 100% EtOAc in hexanes (TLC 4: 1 hex:EtOAc) to afford the title compound as a light yellow foam (3.21 g, 72%). 1H NMR (400 MHz, DMSOd6) δ 8.11 (s, IH), 7.79 (d, J = 8.1 Hz, IH), 7.45 (dd, J - 2.0, 8.1 Hz, IH), 6.42 (s, 2H), 1.57 (s, 9H). LCMS: Anal. Calcd. for C12H14BrN3O2: 311, 313; found: 212, 214 (M+H-boc)+.
EXAMPLE 19
(Sytert-Bxxtyl 3-amino-6-(4-(2-(l-(tert-butoxycarbonyl)pyrrolidin-2-yl)-lH-imidazol~
5-yl)phenyl)- 1 H-indazole- 1 -carboxylate
Figure imgf000065_0002
A mixture of tert-bntyi 3-amino-6-brotno-l H-indazole- 1 -carboxylate (1.17 g, 3.73 mmol), (S)-fert-butyl 2-(5-(4-(4,4,5,5-tetramethyl-l,3J2-dioxaborolan-2- yl)phenyl)-lH-imidazol-2-yl)ρyrrolidine-l -carboxylate (1.62 g, 3.68 mmol), NaHCθ3 (0.96 g} 11 mmol) and Pd(PPh3)4 (212 mg, 0.184 mmol) was degassed and then heated at 8O0C. After heating for 24h the reaction mixture was poured into EtOAc / H2O (500/10OmL) and the mixture was shaken and the layers separated. The aq phase was extracted once more with EtOAc and the combined organic layers were washed (H2O, brine), dried (Na2SO4), and concentrated in vacuo. The residue was purified by BIOTAGE® (40+M, TLC 2:1 EtOAc:hex) affording a light yellow foam (807.8 mg) which was repurifiedby BIOTAGE® (TLC 6:3.5:0.5 hex :EtO AcMeOH) to give the title compound as a light yellow solid (413.9 mg, 36%). 1H NMR (400 MHz, DMSO-d6) δ 11.86 - 12.22 (m, IH), 8.20 (s, IH), 7.85 - 7.92 (m, 3H), 7.75 - 7.76
(m, IH), 7.68 (d, J - 8.1 Hz, IH)5 7.53 - 7.62 (m, 2H), 6.35 (s, 2H), 4.75 - 4.86 (m, IH), 3.49 - 3.58 (m, IH), 3.35 - 3.39 (m, IH), 2.10 - 2.26 (m, IH), 1.80 - 2.01 (m, 3H), 1.60 (s, 9H), 1.40 and 1.15 (s, 9H, rotamers). LCMS: Anal. Calcd. for C30H36N6O4: 544; found: 545 (M+H)+.
EXAMPLE 20 teri-Butyl 6-(4-(2-((S)-l~(tert-butoxycarbonyl)-pyrrolidin-2-yl)-lH-imidazol-5- yl)phenyl)-3-((S)- 1 -(tør^butoxycarbonyl)pyrrolidine-2-carboxamido)- 1 H-indazole- 1 - carboxylate
Figure imgf000066_0001
To a solution (S)-l-(ter/-butoxycarbonyl)pyrrolidine-2-carboxylic acid (97.1 mg, 0.451 mmol) in CH2Cl2 (2 raL) was added ethyl 2-ethoxyquinoline-l(2H)- carboxylate (EEDQ, 181.2 mg, 0.733 mmol) followed by (S)-ferf-butyl 3-amino-6-(4- (2-(l-(tert-butoxycarbonyl)pyrrolidin-2"yl)-lH-imidazol-5-yl)ρhenyl)-lH-indazole-l- carboxylate (209.7 mg, 0.385 mmol) after about 5 min. The reaction mixture as allowed to stir at room temperature for 12 h and the solution was treated with EEDQ (79 mg, 0.365 mmol) and stirred for 48h. The solution was treated with (S)-I -(tert- butoxycarbonyl)pyrrolidine-2-carboxylic acid (60 mg, 0.279 mmol). After stirring a further 12 h the mixture was treated with MeOH (4 mL) followed by IPr2NEt (0.1 mL) and allowed to stir for 2h. The solvent was removed in vacuo and the residue was purified by prep HPLC (CH3CN-H2O-NH4OAc) to give the title compound (197.4 mg, 69%) as a light yellow glass. 1H NMR (400 MHz, DMSO-d6) δ 11.90 - 11.95 (m, IH), 11.13 - 11.20 (m, IH), 8.33 (s, IH), 8.09 (d, J - 8Hz, IH)9 7.88 (app d, J = 8 Hz, 2H), 7.65 - 7.78 (m, 3H), 7.55 - 7.58 (m, IH), 4.75 - 4.87 (m, 2H), 4.36 - 4.43 (m, IH), 4.06 - 4.12 (m, IH), 3.51 - 3.59 (m, IH), 3.42 - 3.47 (m, IH), 3.35 - 3.37 (m, 2H, partially obscured by H2O signal), 2.12 - 2.32 (m, 2H), 1.79 - 2.01 (m, 4H), 1.66 (s, 9H), 1.40 (s, 9H), 1.32 and 1.15 (s, 9H, rotamers). LCMS: Anal. Calcd. for C40H51N7O7: 741; found: 742 (M+H)+.
EXAMPLE 21
(S)-N-(6"(4-(2-((S)-Pyrrolidin-2-yl)-lH4midazol-5-yl)phenyl)-lH-indazoI-3- yl)pyrrolidine-2-carboxamide
Figure imgf000067_0001
A solution of tert-butyl 6-(4-(2-((S)-l-(i'ert-butoxycarboiiyl)-ρyrrolidin-2-yl)- 1 H-imidazol-5-yl)phenyl)-3-((S)- 1 -(ter?-butoxycarbonyl)pyrrolidine-2-carboxamido)- lH-indazole-l-carboxylate (0.187 g, 0.250 mmol) in CH2Cl2 (4 mL) was treated with
TFA (2 mL) and the solution was allowed to stir at rt for 3 h. The solvents were removed in vacuo and the residue was purified by prep HPLC (CH3CN-H2O-TFA) to give the TFA salt of the title compound (154.8 mg, 69%) as a colorless solid. 1H NMR (400 MHz, DMSO-d6) δ 12.91 (s, IH), 11.09 (s, IH), 9.49 - 9.58 (m, IH), 9.21 - 9.29 (m, IH), 8.91 - 9.06 (m, IH), 8.70 - 8.78 (m, IH), 7.89 (app d, J = 8.4 Hz, 2H), 7.77 (app d, J = 8.1 Hz, 2H), 7.69 (s, IH)5 7.44 (dd, J = 1.5, 8.6 Hz, IH), 4.72 - 4.77 (m, 2H), 4.42 - 4.49 (m, 2H), 3.27 - 3.37 (m, 4H), 1.95 - 2.25 (m, 6H). LCMS: Anal. Calcd. for C25H27N7O: 441 ; found: 442 (M+H)+. EXAMPLE 22
(S)-I -((S)-2-Methoxycarbonylaminopropanoyl)-N-(6-(4-(2-((S)-l-((S)-2- methoxycarbonylaminopropanoyl)pyrrolidm-2-yl)- 1 H-imidazol- 5 -yl)pheny I)- 1 H- indazol-3-yl)pyrrolidme-2-carboxamide
Figure imgf000068_0001
To a solution of the TFA salt of (S)-N-(6-(4-(2-((S)-pyrrolidin-2-yl)-lH- imidazol-5-yl)phenyl)-lH-indazol-3-yl)pyrrolidine-2-carboxamide (37.5 mg, 0.042 mmol), (S)-2-(methoxycarbonylamino)propanoic acid (14.8 mg, 0.10 mmol) and IPr2NEt (0.07 mL, 0.40 mmol) in DMF (5 niL) was added HATU (38.1 mg, 0.1 mmol) and the reaction was allowed to stir at rt for 2 h. The reaction mixture was purified by prep HPLC (CH3CN-H2O-NH4OAC) and then flash chromatography on silica gel eluting with 2% to 10% MeOH in CH2Cl2 and then lyophilized to give the title compound (15.4 mg, 53%) as a colorless solid. 1H NMR (400 MHz, DMSO-d6) δ 12.67 (s, IH), 12.05 - 12.21 (m, IH), 11.72 (s, IH), 10.41 (s, IH)5 7.75 - 7.87 (m, 3H)5 7.61 - 7.70 (m, 3H), 7.51 (d, J - 2.1 Hz, IH), 7.35 - 7.41 (m, 2H), 5.06 - 5.08 (m, IH), 4.57 (dd, J = 4.1 , 8.6 Hz, IH), 4.33 - 4.37 (m, 2H), 3.60 - 3.78 (m, 4H), 3.52 (s, 6H), 1.86 - 2.25 (m, 8H), 1.21 (d, J = 6.5 Hz, 6H). LCMS: Anal. Calcd. for C35H41N9O7: 699; found: 700 (M+H)÷.
EXAMPLES 23 TO 25
Examples 23 to 25 were prepared from Example 21 and the appropriate acids according to the procedure described for the preparation of Example 22.
Figure imgf000069_0001
Scheme 4 (used for the preparation of Examples 26 to 34)
Figure imgf000070_0001
2) TFA / CH2CI2
Figure imgf000070_0002
3 CF3CO2H
Figure imgf000070_0003
EXAMPLE 26
5-Bromo- 1 H-mdazol-3-amine 2
Figure imgf000071_0001
To a solution of 5-bromo-lH-indazol-3-aimne (5.00 g, 23.6 mmol) and THF (50 mL) at 25°C was added DMAP (0.288 g, 2.36 mmol). BoC2O (8.21 ml, 35.4 mmol) was then added in 3 portions over 2 h and then allowed to stir overnight. The mixture was partitioned between sat NH4CI and EtOAc and the phases were separated. The aqueous layer was extracted (X2) with EtOAc and the combined organic layers were dried (TS^SO^ and concentrated in vacuo. The crude product was purified, by flash chromatography (BIOTAGE®, eluting with a gradient of 0 to 60% EtOAc/Hexanes) to give a light yellow solid (6.28 g) which was used without further purification in subsequent steps. 1H NMR (500 MHz, CD3OD) δ 7.95 (d, J - 1.8 Hz, IH), 7.85 (s, br, IH), 7.60 (dd, J - 1.8, 8.9 Hz, IH), 1.65 (s, 9H). LCMS: Anal. Calcd. for C7H6BrN3: 210, 212; found: 211, 213 (M+H)+.
EXAMPLE 27
(S)-tert-Butyl 5-bromo-3-(l-(terϊ-butoxycarbonyl)-pyrrolidine-2-carboxamido)-lH- indazole- 1 -carboxylate
Figure imgf000071_0002
A solution of (S)-I -(terϊ-butoxycarbonyl)pyrrolidine-2-carboxylic acid (8.41 g,
39.1 mmol) and ethyl 2-ethoxyquinoline-l(2H)-carboxylate (EEDQ, 9.66 g, 39.1 mmol) in DCE (50 mL) was allowed to stir at rt for 10 min. To this solution was added a solution of tert-butyl S-amino-S-bromo-lH-indazole-l-carboxylate (6.1 g, 19.54 mmol) in DCE (50 mL) in one portion and the resulting mixture was heated at 700C overnight. The mixture was partitioned between sat NaHCO3 and EtOAc and the phases were separated. The aqueous layer was extracted (X2) with EtOAc and the combined organic layers were dried (Na2SO4) and concentrated in vacuo. The residue was purified on flash chromatography (BIOTAGE® eluting with a gradient of 0 to 100% Ether/Hexanes) to afford the title compound as yellow solid contaminated with quinoline. The material was dissolved in ether and washed several times with HCl (IM). The organic layer was dried (IN^SO,^) and concentrated in vacuo to give the title compound (4.8 g, 48% yield) as yellow solid. The material was used as is in subsequent steps. 1H NMR (500 MHz, CD3OD) δ 8.19 (app d, J = 11.3 Hz, IH), 8.03 (unresolved dd, J = 8.9, 11.0 Hz, IH), 7.67 - 7.70 (m, IH), 4.40 - 4.44 (m, IH), 3.57 - 3.61 (m, IH), 3.47 - 3.52 (m, IH), 2.33 - 2.42 (m, IH), 2.01- 2.13 (m, 2H), 1.91 - 1.98 (m, IH), 1.68 (s, 9H), 1.50, 1.42 (s, 9H, rotamers, 2:1 ratio). LCMS: Anal. Calcd. for C22H29BrN4O5: 508, 510; found: 509; 511 (M+H)+.
EXAMPLE 28
(S)-N<5-(4<2-((S)-PyπOlidin-2-yl)-lH-imidazol-5-yl)phenyl)-lH-indazol-3- yl)pyrrolidine-2-carboxamide
Figure imgf000072_0001
Step 1. (S)-terf-Butyl 2-(5-(4-(2-((S)-l-(te^butoxycarbonyl)-pyrrolidin-2-yl)- 1 H-imidazol-5-yl)ρhenyl)- 1 H-indazol-3-ylcarbamoyl)pyrrolidine- 1 -carboxylate was prepared by the method given in Step 1 of Example 11. Obtained as a yellow foam (363 mg, 36%). This material was used as is in the next step. LCMS: Anal. Calcd. for C40H51N7O7: 741; found: 742 (M+H)÷. Note that the indazole Boc group was cleaved under the reaction conditions. Step 2. (S)-fert-Butyl 2-(5-(4-(2-((S)-I -(fer^butoxycarbonyl>pyrrolidm-2-yl>
1 H-imidazol~5-yl)phenyl)-lH-indazol-3-ylcarbamoyl)pyrrolidine-l -carboxylate was deprotected with TFA by the method given in Step 2 of Example 1 1. Obtained a light yellow solid (183 mg, ca. 73%). 1H NMR (500 MHz, CD3OD) δ 8.16 (s, IH), 7.88
(app d, J - 8.2 Hz, 2H), 7.84 (s, IH), 7.76 - 7.79 (m, 3H), 7.59 (d, J - 8.9 Hz, IH), 5.10 (unresolved dd; J - 7.9, 8.9 Hz, IH), 4.63 (unresolved dd, J = 7.3, 8.2 Hz, IH), 3.51 - 3.62 (m, 3H), 3.43 - 3.48 (m, IH), 2.62 - 2.69 (m, 2H), 2.48 - 2.55 (m, IH), 2.15 - 2.40 (m, 1 H). LCMS: Anal. Calcd. for C25H27N7O: 441 ; found: 442 (M+H)+.
EXAMPLE 29
(S)4<(S)-2-Methoxycarbonylaminopropanoyl)-N-(5-(4-(2-((S)-l-((S)-2- methoxycarbonylaminopropanoyl)pyrrolidin-2-yl)-l H-itnidazol-5-yl)phenyl)- 1 H- indazol-3 -yl)pyrrolidine-2-carboxamide
Figure imgf000073_0001
The title compound was prepared by reaction of (S)-N-(5-(4-(2-((S)- ρynOlidin-2-yl)-lH-imidazol-5-yl)phenyl)-lH-indazol-3-yl)pyrrolidiiie-2- carboxamide with (S)-2-(methoxycarbonylamino)-propanoic acid as described in Example 5. The title compound (32.0 mg, 40%). 1H NMR (500 MHz, CD3OD) δ 8.04 (s, IH), 7.65 - 7.80 (m, 5H), 7.50 (d, J - 8.9 Hz, IH), 7.29 (s, IH), 5.19 (m, IH), 4.72 (m, IH), 4.48 (app pentet, J - 7.0 Hz, 2H), 3.85 - 3.88 (m, 2H), 3.71 - 3.76 (m, IH), 3.64 (s, 3H), 3.63 (s, 3H), 3.57 (s, IH), 2.28 - 2.42 (m, 2H), 2.03 - 2.21 (m, 6H), 1.36 (d, J = 7.0 Hz, 3H), 1.32 (d, J = 7.0 Hz, 3H). LCMS: Anal. Calcd. for C35H41N9O7: 699; found: 700 (M+H)+.
EXAMPLES 30 TO 34
Examples 30 to 34 were prepared from Example 28 and the appropriate acids according to the procedure described for the preparation of Example 29.
Figure imgf000074_0001
SYNTHESIS OF COMMON CAPS
Additional LC conditions applicable to the current section, unless noted otherwise.
Condition MS-Wl
Column = XTERRA® 3.0 X 50 mm S7
Start %B - 0
Final %B = 100
Gradient time = 2 min Stop time= 3 min
Flow Rate = 5 mL/min
Wavelength = 220 iim
Solvent A = 0.1% TFA in 10% methanol/90% H2O
Solvent B = 0.1% TFA in 90% methanol/10% H2O
Condition MS-W2
Column - XTERRA® 3.0 X 50 mm S7
Start %B = 0
Final %B = 100 Gradient time = 3 min
Stop time= 4 min
Flow Rate = 4 mL/min
Wavelength = 220 nm
Solvent A - 0.1% TFA in 10% methanol/90% H2O Solvent B = 0.1% TFA in 90% melhanol/10% H2O
Condition MS-W5
Column = XTERRA® 3.0 X 50 mm S7 Start %B = 0 Final %B - 30
Gradient time = 2 min Stop time= 3 min
Flow Rate = 5 mL/min
Wavelength = 220 nm
Solvent A - 0.1% TFA in 10% methanol/90% H2O Solvent B = 0.1% TFA in 90% methanol/10% H2O
Condition Dl
Column - XTERRA® Cl 8 3.0 X 50 mm S7
Start %B - 0 Final %B = 100
Gradient time = 3 min
Stop time= 4 min
Flow Rate = 4 mL/min
Wavelength = 220 nm Solvent A = 0.1 % TFA in 10% methanol/90% H2O
Solvent B - 0.1% TFA in 90% methanol/10% H2O
Condition D2
Column - PHENOMENEX®-Luna 4.6 X 50 mm SlO Start %B - 0
Final %B = 100
Gradient time = 3 min
Stop time= 4 min
Flow Rate = 4 mL/min Wavelength = 220 nm
Solvent A - 0.1% TFA in 10% methanol/90% H2O
Solvent B - 0.1% TFA in 90% methanol/10% H2O
Condition M3 Column = XTERRA® C18 3.0 X 50 mm S7 Start %B = 0 Final %B = 40 Gradient time = 2 min Stop time= 3 min Flow Rate = 5 mL/min Wavelength = 220 nm
Solvent A = 0.1% TFA in 10% methanol/90%H2O
Solvent B = 0.1% TFA in 90% methanol/10% H2O
Condition I Column = PHENOMENEX®-Luna 3.0 X 50 mm SlO
Start %B = 0
Final %B = 100
Gradient time - 2 min
Stop time= 3 min Flow Rate = 4 mL/min
Wavelength = 220 nm
Solvent A = 0.1% TFA in 10% methanol/90% H2O
Solvent B - 0.1% TFA in 90% methanol/10% H2O
Condition IJ
Column - PHENOMENEX®-Luna 4.6 X 50 mm SlO
Start %B - 0
Final %B = 100
Gradient time = 2 min Stop time- 3 min
Flow Rate = 5 mL/min
Wavelength = 220 nm
Solvent A = 0.1% TFA in 10% methanol/90% H2O
Solvent B = 0.1% TFA in 90% methanol/10% H2O Condition III
Column - XTERRA® C18 3.0 x 50mm S7 Start %B = O Final %B - 100 Gradient time = 3 min Stop time^ 4 min Flow Rate = 4 mL/min Wavelength - 220 nm Solvent A - 0.1% TFA in 10% methanol/90% H2O Solvent B = 0.1 % TFA in 90% methanol/10% H2O
Figure imgf000078_0001
A suspension of 10% Pd/C (2.0 g) in methanol (10 mL) was added to a mixture of (R)-2-phenylglycine (10 g, 66.2 mmol), formaldehyde (33 mL of 37% wt. in water), IN HCl (30 mL) and methanol (30 mL), and exposed to H2 (60 psi) for 3 hours. The reaction mixture was filtered through diatomaceous earth (CELITE®), and the filtrate was concentrated in vacuo. The resulting crude material was recrystallized from isopropanol to provide the HCl salt of Cap-1 as a white needle (4.0 g). Optical rotation: -117.1° [c=9.95 mg/niL in H2O; λ-589 nm], 1H NMR (DMSO- d6, δ - 2.5 ppm, 500 MHz): δ 7.43-7.34 (m, 5H), 4.14 (s, IH), 2.43 (s, 6H); LC (Cond. I): RT=0.25; LC/MS: Anal. Calcd. for [M+H]+ C10H14NO2 180.10; found 180.17; HRMS: Anal. Calcd. for [M+H]+ C10H14NO2 180.1025; found 180.1017.
Figure imgf000079_0001
NaBH3CN (6.22 g, 94 mmol) was added in portions over a few minutes to a cooled (ice/water) mixture of (R)-2-phenyl glycine (6.02 g, 39.8 mmol) and methanol (100 niL), and stirred for 5 minutes. Acetaldehyde (10 niL) was added dropwise over 10 minutes and stirring was continued at the same cooled temperature for 45 minutes and at ambient temperature for ~6.5 hours. The reaction mixture was cooled back with ice- water bath, treated with water (3 mL) and then quenched with a dropwise addition of concentrated HCl over - 45 minutes until the pH of the mixture was - 1.5 - 2.0. The cooling bath was removed and the stirring was continued while adding concentrated HCl in order to maintain the pH of the mixture around 1.5-2.0. The reaction mixture was stirred overnight, filtered to remove the white suspension, and the filtrate was concentrated in vacuo. The crude material was recrystallized from ethanol to afford the HCl salt of Cap-2 as a shining white solid in two crops (crop-1 : 4.16 g; crop-2: 2.19 g). 1H NMR (DMSOd6, δ = 2.5 ppm, 400 MHz): 10.44 (1.00, br s, IH), 7.66 (m, 2H), 7.51 (m, 3H), 5.30 (s, IH), 3.15 (br m, 2H), 2.98 (br m, 2H)5 1.20 (app br s, 6H). Crop-1 : [α]25 -102.21° (c=0.357, H2O); crop-2: [α]25 -99.7°
(c=0.357, H2O). LC (Cond. I): RT=0.43 min; LC/MS: Anal. Calcd. for [M+H]+ C12H18NO2: 208.13; found 208.26.
Figure imgf000079_0002
Acetaldehyde (5.0 mL, 89.1 mmol) and a suspension of 10% Pd/C (720 mg) in methanol/H2O (4 mL/1 mL) was sequentially added to a cooled (- 15 0C) mixture of (R)-2-phenylglycine (3.096 g, 20.48 mmol), IN HCl (30 mL) and methanol (40 mL). The cooling bath was removed and the reaction mixture was stirred under a balloon of H2 for 17 hours. An additional acetaldehyde (10 mL5 178.2 mmol) was added and stirring continued under H2 atmosphere for 24 hours [Note: the supply of B/j was replenished as needed throughout the reaction]. The reaction mixture was filtered through diatomaceous earth (CELITE®), and the filtrate was concentrated in vacuo. The resulting crude material was recrystallized from isopropanol to provide the HCl salt of (R)-2-(ethylamino)-2-phenylacetic acid as a shining white solid (2.846 g). 1H NMR (DMSOd6, δ - 2.5 ppm, 400 MHz): δ 14.15 (br s, IH), 9.55 (br s, 2H), 7.55- 7.48 (m, 5H), 2.88 (br m, IH), 2.73 (br m, IH), 1.20 (app t, J=7.2, 3H). LC (Cond. F): RT=O.39 mm; >95 % homogeneity index; LC/MS: Anal. Calcd. for [M+H]+ C10H14NO2: 180.10; found 180.18.
A suspension of 10% Pd/C (536 mg) in methanol/^O (3 mL/1 mL) was added to a mixture of (R)-2-(ethylamino)~2-phenylacetic acid/HCl (1.492 g, 6.918 mmol), formaldehyde (20 mL of 37% wt. in water), IN HCl (20 mL) and methanol (23 mL). The reaction mixture was stirred under a balloon of H2 for -72 hours, where the H2 supply was replenished as needed. The reaction mixture was filtered through diatomaceous earth (CELITE®) and the filtrate was concentrated in vacuo. The resulting crude material was recrystallized from isopropanol (50 mL) to provide the HCl salt of Cap-3 as a white solid (985 mg). 1H NMR (DMSOd6, δ - 2.5 ppm, 400
MHz): δ 10.48 (br s, IH), 7.59-7.51 (m, 5H), 5.26 (s, IH), 3.08 (app br s, 2H), 2.65 (br s, 3 H), 1.24 (br m, 3H). LC (Cond, T): RT-0.39 min; >95 % homogeneity index; LC/MS: Anal. Calcd. for [M+H]+ C1 1H16NO2: 194.12; found 194.18; HRMS: Anal. Calcd. for [M+H]+ C11H16NO2: 194.1180; found 194.1181.
Figure imgf000080_0001
ClCO2Me (3.2 mL, 41.4 mmol) was added dropwise to a cooled (ice/water)
THF (410 mL) semi-solution of (R)-terf-butyl 2-amino-2-phenylacetate/HCl (9.877 g, 40.52 mmol) and diisopropylethylamine (14.2 mL, 81.52 mmol) over 6 min, and stirred at similar temperature for 5.5 hours. The volatile component was removed in vacuo, and the residue was partitioned between water (100 mL) and ethyl acetate (200 mL). The organic layer was washed with IN HCl (25 mL) and saturated NaHCO^ solution (30 mL), dried (MgSO4), filtered, and concentrated in vacuo. The resultant colorless oil was triturated from hexanes, filtered and washed with hexanes (100 mL) to provide (R)-tert-buty\ 2-(methoxycarbonylamino)-2-phenylacetate as a white solid (7.7 g). 1H NMR (DMSOd6, δ = 2.5 ppm, 400 MHz): 7.98 (d, /=8.0, IH)5 7.37-7.29 (m, 5H), 5.09 (d, J=8, IH), 3.56 (s, 3H), 1.33 (s, 9H). LC (Conά. 7): RT-1.53 min; -90 % homogeneity index; LC/MS: Anal. Calcd. for [M+Na]+ C14H19NNaO4:
288.12; found 288.15.
TFA (16 mL) was added dropwise to a cooled (ice/water) CH2Cl2 (160 mL) solution of the above product over 7 minutes, and the cooling bath was removed and the reaction mixture was stirred for 20 hours. Since the deprotection was still not complete, an additional TFA (1.0 mL) was added and stirring continued for an additional 2 hours. The volatile component was removed in vacuo, and the resulting oil residue was treated with diethyl ether (15 mL) and hexanes (12 mL) to provide a precipitate. The precipitate was filtered and washed with diethyl ether/hexanes (~1 :3 ratio; 30 mL)-and dried in vacuo to provide Cap-4 as a fluffy white solid (5.57 g). Optical rotation: -176.9° [c=3.7 mg/mL in H2O; λ=589 nm]. 1H NMR (DMSO-d6, δ
= 2.5 ppm, 400 MHz): δ 12.84 (br s, IH), 7.96 (d, J=E 3, IH), 7.41-7.29 (m, 5H)5 5.14 (d, J=8.3, IH), 3.55 (s, 3H). LC (Cond. I): RT=LOl min; >95 % homogeneity index; LC/MS: Anal. Calcd. for [M+H]+ C10H12NO4 210.08; found 210.17; HRMS: Anal.
Calcd. for [M+H]+ C10H12NO4 210.0766; found 210.0756.
Figure imgf000082_0001
A mixture of (R)- 2-ρhenylglycine (1.0 g, 6.62 mmol), 1 ,4-dibromobutane (1.57 g, 7.27 mmol) and Na2CO3 (2.10 g, 19.8 mmol) in ethanol (40 niL) was heated at 100 0C for 21 hours. The reaction mixture was cooled to ambient temperature and filtered, and the filtrate was concentrated in vacuo. The residue was dissolved in ethanol and acidified with IN HCl to pH 3-4, and the volatile component was removed in vacuo. The resulting crude material was purified by a reverse phase HPLC (water/methanol/TFA) to provide the TFA salt of Cap-5 as a semi-viscous white foam (1.0 g). 1H NMR (DMSO-d6> δ - 2.5, 500 MHz) δ 10.68 (br s, IH), 7.51 (m, 5H), 5.23 (s, IH), 3.34 (app br s, 2H)5 3.05 (app br s, 2H), 1.95 (app br s, 4H); RT=0.30 minutes (Cond. I); >98% homogeneity index; LC/MS: Anal. Calcd. for [M+H]+ C12H16NO2: 206.12; found 206.25.
Figure imgf000082_0002
The TFA salt of Cap-6 was synthesized from (R)-2-phenylglycine and 1- bromo-2-(2-bromoethoxy)ethane by using the method of preparation of Cap-5. 1H NMR (DMSO-d6, 8 = 2.5, 500 MHz) δ 12.20 (br s, IH), 7.50 (m, 5H), 4.92 (s, IH), 3.78 (app br s, 4H), 3.08 (app br s, 2H), 2.81 (app br s, 2H); RT-0.32 minutes (Cond. T); >98%; LC/MS: Anal. Calcd. for [M+H]+ C12H16NO3: 222.1 1; found 222.20;
HRMS: Anal. Calcd. for [M+H]+ C12H16NO3: 222.1130; found 222.1121. Cap-7
Cap-7a: enantiomer-1 Cap-7b: enantiomer-2
Figure imgf000083_0001
A CH2Cl2 (200 mL) solution of p-toluenesulfonyl chloride (8.65 g, 45.4 mmol) was added dropwise to a cooled (-5 0C) CH2Cl2 (200 mL) solution of (S)- benzyl 2-hydroxy-2-phenylacetate (10.0 g, 41.3 mmol), triethylamine (5.75 mL, 41.3 mmol) and 4-dimethylaminopyridine (0.504 g, 4.13 mmol), while maintaining the temperature between -5 0C and 0 °C. The reaction was stirred at 0 0C for 9 hours, and then stored in a freezer (-25 0C) for 14 hours, It was allowed to thaw to ambient temperature and washed with water (200 mL), IN HCl (100 mL) and brine (100 mL), dried (MgSC^), filtered, and concentrated in vacuo to provide benzyl 2-phenyl-2-
(tosyloxy)acetate as a viscous oil which solidified upon standing (16.5 g). The chiral integrity of the product was not checked and that product was used for the next step without further purification. ^H NMR (DMSOd6, δ = 2.5, 500 MHz) 5 7.78 (d, J=
8.6, 2H), 7.43-7.29 (m} 10H), 7.20 (m, 2H), 6.12 (s, IH), 5.16 (d, J=12.5, IH), 5.10 (d, /=12.5, IH), 2.39 (s, 3H). RT=3.00 (Cond. Ill); >90% homogeneity index; LC/MS: Anal. Calcd. for [M+H]+ C22H20NaO5S: 419.09; found 419.04.
A THF (75 mL) solution of benzyl 2-phenyl-2-(tosyloxy)acetate (6.0 g, 15.1 mmol), 1 -methylpiperazine (3.36 mL, 30.3 mmol) and N,N-diisopropylethylamine (13.2 mL, 75.8 mmol) was heated at 65 0C for 7 hours. The reaction was allowed to cool to ambient temperature and the volatile component was removed in vacuo. The residue was partitioned between ethylacetate and water, and the organic layer was washed with water and brine, dried (MgSC^), filtered, and concentrated in vacuo.
The resulting crude material was purified by flash chromatography (silica gel, ethyl acetate) to provide benzyl 2-(4-methylpiperazin-l-yl)-2-phenylacetate as an orangish- brown viscous oil (4.56 g). Chiral HPLC analysis (CHIRALCEL® OD-H) indicated that the sample is a mixture of enantiomers in a 38.2 to 58.7 ratio. The separation of the enantiomers were effected as follow: the product was dissolved in 120 mL of ethanol/heptane (1:1) and injected (5 mL/injection) on chiral HPLC column (Chiracel OJ, 5 cm ID x 50 cm L, 20 μm) eluting with 85:15 Heptane/ethanol at 75 mL/min, and monitored at 220 nm. Enantiomer-1 (1.474 g) and enantiomer~2 (2.2149 g) were retrieved as viscous oil. 1H NMR (CDCl3, 6=7.26, 500 MHz) 7.44-7.40 (m, 2H), 733-7.24 (m, 6H), 7.21-7.16 (m, 2H), 5.13 (d, /=12.5, IH)5 5.08 (d, J=12.5, IH), 4.02 (s, IH), 2.65-238 (app br s, 8H), 2.25 (s, 3H). RT=2.10 (CW. Ill); >98% homogeneity index; LC/MS: Anal. Calcd. for [M+H]+ C20H25N2O2: 325.19; found
325.20. A methanol (10 mL) solution of either enantiomer of benzyl 2-(4- methylpiperazin-l-yl)-2-phenylacetate (1.0 g, 3.1 mmol) was added to a suspension of 10% Pd/C (120 mg) in methanol (5,0 mL). The reaction mixture was exposed to a balloon of hydrogen, under a careful monitoring, for <50 minutes. Immediately after the completion of the reaction, the catalyst was filtered through diatomaceous earth (CELITE®) and the filtrate was concentrated in vacuo to provide Caρ-7, contaminated with phenylacetic acid as a tan foam (867.6 mg; mass is above the theoretical yield). The product was used for the next step without further purification. 1H NMR (DMSO-d6, δ - 2.5, 500 MHz) δ 7.44-737 (m, 2H), 737-7.24 (m, 3H), 3.92 (s, IH), 2.63-2.48 (app. br s, 2H)5 2.48-2.32 (m, 6H), 2.19 (s, 3H); RT=0.31 (Cond. /Z); >90% homogeneity index; LC/MS: Anal. Calcd. for [M+H]+ C13H19N2O2: 235.14; found 235.15; HRMS: Anal. Calcd. for [M+H]+ C13H19N2O2: 235.1447; found 235.1440.
The synthesis of Cap-8 and Cap-9 was conducted according to the synthesis of Cap-7 by using appropriate amines for the SN2 displacement step (i.e., A- hydroxypiperidine for Cap-8 and (S)-3-fluoropyrrolidine for Cap-9) and modified conditions for the separation of the respective stereoisomers intermediates, as described below. Cap-8
8a: enantiomer-1 8b: eπantiomer-2
Figure imgf000085_0001
The enantiomeric separation of the intermediate benzyl 2-(4-hydroxypiperidin- l-yl)-2-phenyl acetate was effected by employing the following conditions: the compound (500 mg) was dissolved in ethanol/heptane (5 mL/45 mL). The resulting solution was injected (5 mL/injection) on a chiral HPLC column (Chiracel OJ, 2 cm ID x 25 cm L, 10 μm) eluting with 80:20 heptane/ethanol at 10 mL/min, monitored at 220 nm, to provide 186.3 mg of enantiomer-1 and 209.1 mg of enantiomer-2 as light- yellow viscous oils. These benzyl ester was hydrogenolysed according to the preparation of Cap-7 to provide Cap-8: 1H NMR (DMSO-d6, δ = 2.5 , 500 MHz) 7.40 (d, J=7, 2H), 7.28-7.20 (m, 3H), 3.78 (s IH), 3.46 (m, IH), 2.93 (m, IH), 2.62 (m, IH), 2.20 (m, 2H), 1.70 (m, 2H), 1.42 (m, 2H). RT=0.28 (Cond. IT); >98% homogeneity index; LC/MS: Anal. Calcd. for [MH-H]+ C13H18NO3: 236.13; found 236.07; HRMS: Calcd. for [M+H]+ C13H18NO3: 236.1287; found 236.1283.
diastereomeM diastereomer-2
Figure imgf000085_0002
The diastereomeric separation of the intermediate benzyl 2-((S)-3- fluoropyrrolidin-l-yl)-2-phenylacetate was effected by employing the following conditions: the ester (220 mg) was separated on a chiral HPLC column (Chiracel OJ- H, 0.46 cm ID x 25 cm L, 5 μm) eluting with 95% CO2/5% methanol with 0.1% TFA, at 10 bar pressure, 70 mL/min flow rate, and a temperature of 35 0C. The HPLC elute for the respective stereoisomers was concentrated, and the residue was dissolved in CH2CI2 (20 mL) and washed with an aqueous medium (10 mL water + 1 niL saturated NaHCO3 solution). The organic phase was dried (MgSO,^), filtered, and concentrated in vacuo to provide 92.5 mg of fraction- 1 and 59.6 mg of fraction-2. These benzyl esters were hydrogenolysed according to the preparation of Cap-7 to prepare Caρ-9a and Cap-9b. Cap-9a (diastereomer-1 ; the sample is a TFA salt as a result of purification on a reverse phase HPLC using H2O/methanol/TFA solvent): 1H NMR (DMSO-d6, δ = 2.5, 400 MHz) 7.55-7.48 (m, 5H), 5.38 (d of m, J=53.7, IH)9 5.09 (br s, IH), 3.84-2.82 (br m, 4H), 2.31-2.09 (m, 2H). RT-0.42 (Cond. T); >95% homogeneity index; LC/MS: Anal. Calcd. for [M+H]+ C12H15FNO2: 224.11 ; found 224.14; Cap-9b (diastereomer-2): *H NMR (DMSO-d6, 5 - 2.5, 400 MHz) 7.43-7.21 (m, 5H), 5.19 (d of m, J-55.9, IH), 3.97 (s, IH), 2.95-2.43 (m, 4H), 2.19-1.78 (m, 2H). RT=0.44 {Cond. I); LC/MS: Anal. Calcd. for [M+H]+ C12H15FNO2: 224.11; found 224.14.
Cap- 10
Figure imgf000086_0001
To a solution of D-proline (2.0 g, 17 mmol) and formaldehyde (2.0 mL of 37% wt. in H2O) in methanol (15 mL) was added a suspension of 10% Pd/C (500 mg) in methanol (5 mL). The mixture was stirred under a balloon of hydrogen for 23 hours. The reaction mixture was filtered through diatomaceous earth (CELITE®) and concentrated in vacuo to provide Cap- 10 as an off-white solid (2.15 g). ^H NMR (DMSO-d6, δ = 2.5, 500 MHz) 3.42 (m, IH), 3.37 (dd, /=9.4, 6.1, IH), 2.85-2.78 (m, IH), 2.66 (s, 3H), 2.21-2.13 (m, IH), 1.93-1.84 (m, 2H), 1.75-1.66 (m, IH). RT=0.28 (Cond. II); >98% homogeneity index; LC/MS: Anal. Calcd. for [M+H]+ C6H12NO2: 130.09; found 129.96.
Figure imgf000087_0001
A mixture of (2S,4R)-4-fluoropyuolidine~2~carboxylic acid (0.50 g} 3.8 mmol), formaldehyde (0.5 mL of 37% wt. in H2O), 12 N HCl (0.25 mL) and 10% Pd/C (50 mg) in methanol (20 mL) was stirred under a balloon of hydrogen for 19 hours. The reaction mixture was filtered through diatomaceous earth (CELITE®) and the filtrate was concentrated in vacuo. The residue was recrystallized from isopropanol to provide the HCl salt of Cap- 11 as a white solid (337.7 mg). 1H NMR (DMSOd6, δ = 2.5, 500 MHz) 5.39 (d m, J=53.7, IH), 4.30 (m, IH), 3.90 (ddd, /=31.5, 13.5, 4.5, IH), 3.33 (dd, J=25.6, 13.4, IH), 2.85 (s, 3H), 2.60-2.51 (m, IH), 2.39-2.26 (m, IH). RT=0.28 (Cond. II); >98% homogeneity index; LC/MS: Anal. Calcd. for [M+H)+ C6H11FNO2: 148.08; found 148.06.
Cap- 12 (same as Cap-52)
Figure imgf000087_0002
L- Alanine (2.0 g, 22.5 mmol) was dissolved in 10% aqueous sodium carbonate solution (50 mL), and a THF (50 mL) solution of methyl chloroformate (4.0 mL) was added to it. The reaction mixture was stirred under ambient conditions for 4.5 hours and concentrated in vacuo. The resulting white solid was dissolved in water and acidified with IN HCl to a pH ~ 2-3. The resulting solutions was extracted with ethyl acetate (3 x 100 mL), and the combined organic phase was dried (Na2SO4), filtered, and concentrated in vacuo to provide a colorless oil (2.58 g). 500 mg of this material was purified by a reverse phase HPLC (H2O/methanol/TFA) to provide 150 mg of Cap-12 as a colorless oil. 1H NMR (DMSO-d6, δ - 2.5, 500 MHz) 7.44 (d, J=7.3, 0.8H), 7.10 (br s, 0.2H), 3.97 (m, IH), 3.53 (s, 3H), 1.25 (d, /=7.3, 3H). Cap- 13
Figure imgf000088_0001
A mixture of L-alanine (2.5 g, 28 mmol), formaldehyde (8.4 g, 37 wt. %), IN HCl (30 mL) and 10% Pd/C (500 mg) in methanol (30 mL) was stirred under a hydrogen atmosphere (50 psi) for 5 hours. The reaction mixture was filtered through diatomaceous earth (CELITE®) and the filtrate was concentrated in vacuo to provide the HCl salt of Caρ-13 as an oil which solidified upon standing under vacuum (4.4 g; the mass is above theoretical yield). The product was used without further purification. 1H NMR (DMSO-d6> δ = 2.5, 500 MHz) δ 12.1 (br s, IH), 4.06 (q, /=7.4, IH)5 2.76 (s, 6H), 1.46 (d, J=7.3, 3H).
Cap- 14
Figure imgf000088_0002
Cap-14
Step 1. A mixture of (R)-(-)-D-phenylglycine tert-butyl ester (3.00 g, 12.3 mmol), NaBH3CN (0.773 g, 12.3 mmol), KOH (0.690 g, 12.3 mmol) and acetic acid
(0.352 mL, 6.15 mmol) were stirred in methanol at 0 0C. To this mixture was added glutaric dialdehyde (2.23 mL, 12.3 mmol) dropwise over 5 minutes. The reaction mixture was stirred as it was allowed to warm to ambient temperature and stirring was continued at the same temperature for 16 hours. The solvent was subsequently removed and the residue was partitioned with 10% aqueous NaOH and ethyl acetate, The organic phase was separated, dried (MgSO^, filtered and concentrated to dryness to provide a clear oil. This material was purified by reverse-phase preparative HPLC (Primesphere C-18, 30 x 100mm; CH3CN-H2O-0.1% TFA) to give the intermediate ester (2.70 g, 56%) as a clear oil. 1H NMR (400 MHz, CDCl3) δ 7.53-7.44 (m, 3H), 7.40-7.37 (m, 2H), 3.87 (d, 7=10.9 Hz, IH), 3.59 (d, 7=10.9 Hz, IH), 2.99 (t, 7=11.2 Hz, IH), 2.59 (t, 7=11.4 Hz, IH), 2.07-2.02 (m, 2H)5 1.82 (d, 7=1.82 Hz, 3H), 1.40 (s, 9H). LC/MS: Anal. Calcd. for CnH25NO2: 275; found: 276 (M+H)+.
Step 2. To a stirred solution of the intermediate ester (1.12 g, 2.88 mmol) in dichloromethane (10 mL) was added TFA (3 mL). The reaction mixture was stirred at ambient temperature for 4 hours and then it was concentrated to dryness to give a light yellow oil. The oil was purified using reverse-phase preparative HPLC (Primesphere C-18, 30 x 100mm; CH3CN-H2O-0.1% TFA). The appropriate fractions were combined and concentrated to dryness in vacuo. The residue was then dissolved in a minimum amount of methanol and applied to applied to MCX LP extraction cartridges (2 x 6 g). The cartridges were rinsed with methanol (40 mL) and then the desired compound was eluted using 2M ammonia in methanol (50 mL). Product- containing fractions were combined and concentrated and the residue was taken up in water. Lyophilization of this solution provided the title compound (0.492 g} 78%) as a light yellow solid. 1H NMR (DMSO^6) δ 7.50 (s, 5H), 5.13 (s, IH), 3.09 (br s, 2H)5 2,92-2.89 (m, 2H), 1.74 (m, 4H), 1.48 (br s, 2H). LC/MS: Anal. Calcd. for C13H17NO2: 219; found: 220 (M+H)+.
Cap- 15
Figure imgf000089_0001
Figure imgf000089_0002
Step 1. (S)-l-Phenylethyl 2-bromo-2-phenylacetate
To a mixture of α-bromophenylacetic acid (10.75 g, 0.050 mol), (S)-(-)-l- phenylethanol (7.94 g, 0.065 mol) and DMAP (0.61 g, 5.0 mmol) in dry dichloromethane (100 mL) was added solid EDCI (12.46 g, 0.065 mol) all at once. The resulting solution was stirred at room temperature under Ar for 18 hours and then it was diluted with ethyl acetate, washed (H2O x 2, brine), dried (Na2SO4), filtered, and concentrated to give a pale yellow oil. Flash chromatography (SiC^/hexane-ethyl acetate, 4:1) of this oil provided the title compound (11.64 g, 73%) as a white solid. lH NMR (400 MHz5 CDCl3) δ 7.53-7.17 (m, 10H), 5.95 (q, J^β.6 Hz, 0.5H), 5.94 (q, J=6.6 Hz, 0.5H), 5.41 (s, 0.5H), 5.39 (s, 0.5H), 1.58 (d, 7=6.6 Hz, 1.5H), 1.51 (d, /=6.6 Hz, 1.5H).
Step 2. (S)-l-Phenylethyl (R)-2-(4-hydroxy-4-rnethylρiperidin-l-yl)- 2-phenylacetate To a solution of (S)-I -phenylethyl 2-bromo-2-ρhenylacetate (0.464 g, 1.45 mmol) in THF (8 mL) was added triethylamine (0.61 mL, 4.35 mmol), followed by tetrabutylammonium iodide (0.215 g, 0.58 mmol). The reaction mixture was stirred at room temperature for 5 minutes and then a solution of 4-methyl-4-hydroxypiperidine (0.251 g, 2.18 mmol) in THF (2 mL) was added. The mixture was stirred for 1 hour at room temperature and then it was heated at 55-60 0C (oil bath temperature) for 4 hours. The cooled reaction mixture was then diluted with ethyl acetate (30 mL), washed (H2O x2, brine), dried (MgSO1^, filtered and concentrated. The residue was purified by silica gel chromatography (0-60% ethyl acetate-hexane) to provide first the (S,R)-isomer of the title compound (0.306 g, 60%) as a white solid and then the corresponding (S,S)-isomer (0.120 g, 23%), also as a white solid. (S,R)-isomer: *H NMR (CD3OD) δ 7.51-7.45 (m, 2H), 7.41-7.25 (m, 8H)5 5.85 (q, J=6.6 Hz, IH), 4.05 (s, IH), 2.56-2.45 (m, 2H), 2.41-2.29 (m, 2H), 1.71-1.49 (m, 4H), 1.38 (d, J=6.6 Hz, 3H), 1.18 (s, 3H). LCMS: Anal. Calcd. for C22H27NO3: 353; found: 354 (M+H)÷.
(S,S)-isomer: 1H NMR (CD3OD) 5 7.41-7.30 (m, 5H), 7.20-7.14 (m, 3H), 7.06-7.00 (m, 2H), 5.85 (q, J=6.6 Hz1 IH), 4.06 (s, IH)5 2.70-2.60 (m, IH), 2.51 (dt, /=6.6, 3.3 Hz, IH), 2.44-2.31 (m, 2H), 1.75-1.65 (m, IH), 1.65-1.54 (m, 3H), 1.50 (d, 7=6.8 Hz, 3H), 1.20 (s, 3H). LCMS: Anal. Calcd. for C22H27NO3: 353; found: 354 (M+H)+.
Step 3, (R)-2-(4-Hydroxy-4-methylpiperidin-l-yl)-2-phenylacetic acid To a solution of (S)- 1 -plienylethyl (R)-2-(4-hydroxy-4-methylpiperidin- 1 -yl)-
2-phenylacetate (0.185 g, 0.52 mmol) in dichloromethane (3 niL) was added trifluoroacetic acid (1 rnL) and the mixture was stirred at room temperature for 2 hours. The volatiles were subsequently removed in vacuo and the residue was purified by reverse-phase preparative HPLC (Primesphere C-18, 20 x 100mm; CH3CN-H2O-0.1 % TFA) to give the title compound (as TFA salt) as a pale bluish solid (0,128 g, 98%). LCMS: Anal. Calcd. for C14H19NO3: 249; found: 250 (M+H)+.
Figure imgf000091_0001
(R>Cap-16
Step 1. (S)-l-Phenylethyl 2-(2-fluorophenyl)acetate
A mixture of 2-fluorophenylacetic acid (5.45 g, 35.4 mmol), (S)-I- phenylethanol (5.62 g, 46.0 mmol), EDCI (8.82 g, 46.0 mmol) and DMAP (0.561 g, 4.60 mmol) in CH2CI2 (100 mL) was stirred at room temperature for 12 hours. The solvent was then concentrated and the residue partitioned with H2O-ethyl acetate.
The phases were separated and the aqueous layer back-extracted with ethyl acetate (2x), The combined organic phases were washed (H2O, brine), dried (TN^SO4), filtered, and concentrated in vacuo. The residue was purified by silica gel chromatography (BIOT AGE®/0-20% ethyl acetate-hexane) to provide the title compound as a colorless oil (8.38 g, 92%). 1H NMR (400 MHz, CD3OD) δ 7.32-7.23 (m, 7H), 7.10-7.04 (m, 2), 5.85 (q, J-6.5 Hz, IH), 3.71 (s, 2H), 1.48 (d, J=6.5 Hz, 3H).
Step 2. (R)-((S)-1 -Phenylethyl) 2-(2-fluorophenyl)-2~(piperidin-l-yl)acetate To a solution of (S) A -phenylethyl 2-(2-fluorophenyl)acetate (5.00 g, 19.4 mmol) in THF (1200 mL) at 0 0C was added DBU (6.19 g, 40.7 mmol) and the solution was allowed to warm to room temperature while stirring for 30 minutes. The solution was then cooled to -78 0C and a solution of CBr4 (13.5 g, 40.7 mmol) in THF
(100 mL) was added and the mixture was allowed to warm to -10 0C and stirred at this temperature for 2 hours. The reaction mixture was quenched with saturated aq. NH4CI and the layers were separated. The aqueous layer was back-extracted with ethyl acetate (2x) and the combined organic phases were washed (H2O, brine), dried (Na2SC>4), filtered, and concentrated in vacuo. To the residue was added piperidine (5.73 mL, 58.1 mmol) and the solution was stirred at room temperature for 24 hours. The volatiles were then concentrated in vacuo and the residue was purified by silica gel chromatography (BIOT AGE®/0- 30% diethyl ether-hexane) to provide a pure mixture of diastereomers (2: 1 ratio by 1H NMR) as a yellow oil (2,07 g, 31%), along with unreacted starting material (2.53 g, 51%). Further chromatography of the diastereomeric mixture (BIOTAGE®/0-10% diethyl ether-toluene) provided the title compound as a colorless oil (0.737 g, 11%). 1H NMR (400 MHz, CD3OD) δ 7.52
(ddd, /=9.4, 7.6, 1.8 Hz, IH), 7.33 - 7.40 (m, 1), 7.23 - 7.23 (ra, 4H), 7.02 - 7.23 (m, 4H), 5.86 (q, J-6.6 Hz, IH)5 4.45 (s, IH), 2.39 - 2.45 (m, 4H), 1.52 - 1.58 (m, 4H), 1.40 - 1.42 (m, IH), 1.38 (d, J=6.6 Hz5 3H). LCMS: Anal Calcd. for C2IH24FNO2:
341; found: 342 (M+H)+.
Step 3. (R)~2~(2-Fluorophenyl)-2-(piperidin-l-yl)acetic acid
A mixture of (R)-((S)-1 -phenylethyl) 2-(2-fluorophenyl)-2-(piperidm-l- yl)acetate (0.737 g, 2.16 mmol) and 20% Pd(OH)2/C (0.070 g) in ethanol (30 mL) was hydrogenated at room temperature and atmospheric pressure (H2 balloon) for 2 hours. The solution was then purged with Ar, filtered through diatomaceous earth (CELITE®), and concentrated in vacuo. This provided the title compound as a colorless solid (0.503 g, 98%). 1H NMR (400 MHz, CD3OD) δ 7.65 (ddd, /=9.1,
7.6, 1.5 Hz, IH), 7.47-7.53 (m, IH), 7.21-7.30 (m, 2H), 3.07-3.13 (m, 4H), 1.84 (br s, 4H), 1.62 (br s, 2H). LCMS: Anal. Calcd. for C13H16FNO2: 237; found: 238 (M+H)+
Figure imgf000093_0001
(R)-Cap-π
Step 1. (S)-l-Phenylethyl (R)-2-(4-hydroxy-4-phenylpiperidin-l-yl)- 2-phenylacetate To a solution of (S)-l-phenylethyl 2-bromo-2-phenylacetate (1.50 g, 4.70 mmol) in THF (25 mL) was added triethylamine (1.31 niL, 9.42 mmol), followed by tetrabutylammonium iodide (0.347 g, 0.94 mmol). The reaction mixture was stirred at room temperature for 5 minutes and then a solution of 4-phenyl-4-hydroxypiperidine (1.00 g, 5.64 mmol) in THF (5 mL) was added. The mixture was stirred for 16 hours and then it was diluted with ethyl acetate (100 mL), washed (H2O x2, brine), dried
(MgSO4), filtered and concentrated. The residue was purified on a silica gel column (0-60% ethyl acetate-hexane) to provide an approximately 2:1 mixture of diastereomers, as judged by 1H NMR. Separation of these isomers was performed using supercritical fluid chromatography (CHIRALCEL® OJ-H, 30 x 250mm; 20% ethanol in CO2 at 35 0C), to give first the (R)-isomer of the title compound (0.534 g, 27%) as a yellow oil and then the corresponding (S)-isomer (0.271 g, 14%), also as a yellow oil. (S,R)-isomer: 1HNMR (400 MHz, CD3OD) δ 7.55-7.47 (m, 4H), 7.44- 7.25 (m, 10H), 7.25-7.17 (m, IH), 5.88 (q, /=6.6 Hz, IH), 4.12 (s, IH), 2.82-2.72 (m, IH), 2.64 (dt, J=I 1.1, 2.5 Hz, IH), 2.58-2.52 (m, IH), 2.40 (dt, J=I 1.1, 2.5 Hz, IH), 2.20 (dt, /=12.1, 4.6 Hz, IH), 2.10 (dt, /=12.1, 4.6 Hz, IH), 1.72-1.57 (m, 2H), 1.53 (d, J=6.5 Hz, 3H). LCMS: Anal. Calcd. for C27H29NO3: 415; found: 416 (M+H)+; (S,S)-isomer: H1NMR (400 MHz, CD3OD) δ 7.55-7.48 (m, 2H)5 7.45-7.39 (m, 2H), 7.38-7.30 (m, 5H)5 7.25-7.13 (m, 4H), 7.08-7.00 (m, 2H), 5.88 (q, J=6.6 Hz, IH)5 4.12 (s, IH), 2.95-2.85 (m, IH), 2.68 (dt, J-I Ll5 2.5 Hz, IH), 2.57-2.52 (m, IH), 2.42 (dt, 7=11.1, 2.5 Hz, IH), 2.25 (dt, 7=12.1, 4.6 Hz, IH), 2.12 (dt, /=12.1, 4.6 Hz, IH), 1.73 ((1(1, 7=13.6, 3.0 Hz, IH), 1.64 (dd, J= 13.6, 3.0 Hz, IH), 1.40 (d, 7=6.6 Hz, 3H). LCMS: Anal. Calcd. for C27H29NO3: 415; found: 416 (M+H)+.
The following esters were prepared in similar fashion:
Figure imgf000094_0001
Figure imgf000095_0001
Chiral SFC Conditions for Determining Retention Time
Condition I
Column = Chiralpak AD-H Column, 4.62x50 mm, 5μm
Solvents = 90% CO2- 10% methanol with 0.1%DEA
Temp - 35 0C
Pressure - 150 bar
Flow rate - 2.0 mL/min.
UV monitored @ 220 nm
Injection = 1.0 mg/3 mL methanol
Condition II
Column = CHIRALCEL® OD-H Column, 4.62x50 mm, 5μm Solvents = 90% CO2-10% methanol with 0.1%DEA
Temp - 35 0C Pressure = 150 bar Flow rate = 2.0 mL/min. UV monitored @ 220 nm Injection = 1.0 mg/mL methanol Cap-17, Step 2; (R)~2-(4~Hydroxy-4-phenylpiperidin-l-yl)-2-phenylacetic acid: To a solution of (S)-l-phenylethyl (R)-2-(4-hydroxy-4-phenylpiperidin-l-yl)-2- phenylacetate (0.350 g, 0.84 mmol) in dichloromethane (5 roL) was added trifluoroacetic acid (1 mL) and the mixture was stirred at room temperature for 2 hours. The volatiles were subsequently removed in vacuo and the residue was purified by reverse-phase preparative HPLC (Primesphere C-18, 20 x 100mm; CH3CN-H2O-0.1% TFA) to give the title compound (as TFA salt) as a white solid
(0.230 g, 88%). LCMS: Anal Calcd. FOr C19H21NO3: 311.15; found: 312 (M+H)+.
The following carboxylic acids were prepared in optically pure form in a similar fashion:
Figure imgf000096_0001
LCMS Conditions for Determining Retention Time
Condition I Column = PHENOMENEX®-Luna 4.6 X 50 mm SlO Start % B - 0 Final % B - 100 Gradient Time - 4 mm Flow Rate = 4 mL/min Wavelength = 220
Solvent A - 10% methanol - 90% H2O - 0.1% TFA Solvent B = 90% methanol ~~ 10% H2O - 0.1% TFA
Condition II Column = Waters-Sunfire 4.6 X 50 mm S5
Start % B = 0
Final % B = 100
Gradient Time = 2 min
Flow Rate = 4 mL/min Wavelength = 220
Solvent A - 10% methanol - 90% H2O - 0.1% TFA
Solvent B = 90% methanol - 10% H2O - 0.1% TFA
Condition III Column - PHENOMENEX® 1 Oμ 3.0 X 50 mm
Start % B = 0
Finaϊ % B = 100
Gradient Time = 2 min
Flow Rate = 4 mL/min Wavelength - 220
Solvent A - 10% methanol - 90% H2O - 0.1% TFA Solvent B - 90% methanol - 10% H2O - 0.1% TFA
Cap- 18
Figure imgf000098_0001
cap-18
Step 1. (R,S)-Ethyl 2-(4-pyridyl>2-bromoacetate
To a solution of ethyl 4-pyridylacetate (1.00 g, 6.05 mmol) in dry THF (150 mL) at 0 0C under argon was added DBU (0.99 mL, 6.66 mmol). The reaction mixture was allowed to warm to room temperature over 30 minutes and then it was cooled to -78 0C. To this mixture was added CBr4 (2.21 g, 6.66 mmol) and stirring was continued at -78 0C for 2 hours. The reaction mixture was then quenched with sat. aq. NH4CI and the phases were separated. The organic phase was washed (brine), dried (Na2SO4), filtered, and concentrated in vacuo. The resulting yellow oil was immediately purified by flash chromatography (Siθ2/hexane-ethyl acetate, 1 :1) to provide the title compound (1.40 g, 95%) as a somewhat unstable yellow oil. 1H NMR (400 MHz, CDCl3) δ 8.62 (dd, J=4.6, 1.8 Hz, 2H), 7.45 (dd, J-4.6, 1.8 Hz, 2H), 5.24 (s, IH), 4.21-4.29 (m, 2H), 1.28 (t, J-7.1 Hz, 3H). LCMS: Anal. Calcd. for C9H10BrNO2: 242, 244; found: 243, 245 (M+H)+.
Step 2. (R,S)-Ethyl 2-(4-pyridyl)-2-(N,N-dimethylamino)acetate
To a solution of (R,S)-ethyl 2-(4-pyridyl)-2-bromoacetate (1.40 g, 8.48 mmol) in DMF (10 mL) at room temperature was added dimethylamme (2M in THF, 8.5 mL, 17.0 mmol). After completion of the reaction (as judged by thin layer chromatography) the volatiles were removed in vacuo and the residue was purified by flash chromatography (BIOT AGE®, 40+M SiO2 column; 50%-100% ethyl acetate- hexane) to provide the title compound (0.539 g, 31%) as a light yellow oil. 1H NMR (400 MHz, CDCl3) δ 8.58 (d, J=6.0 Hz, 2H), 7.36 (d, 7=6.0 Hz, 2H), 4.17 (m, 2H), 3.92 (s, IH), 2.27 (s, 6H), 1.22 (t, J=7.0 Hz). LCMS: Anal. Calcd. for CnHi6N2O2: 208; found: 209 (M+H)+.
Step 3. (R,S)-2~(4-Pyridyl)-2-(N,N-dimethylamino)acetic acid To a solution of (R,S)-ethyl 2-(4-pyridyl)~2-(N,N-dimethylamino)acetate
(0.200 g, 0.960 mmol) in a mixture of THF-methanol-H2O (1 :1 :1, 6 mL) was added powdered LiOH (0.120 g, 4.99 mmol) at room temperature. The solution was stirred for 3 hours and then it was acidified to pH 6 using IN HCl. The aqueous phase was washed with ethyl acetate and then it was lyophilized to give the dihydrochloride of the title compound as a yellow solid (containing LiCl). The product was used as such in subsequent steps. 1H NMR (400 MHz9 DMSO-d6) δ 8.49 (d, J=5.7 Hz, 2H), 7.34 (d, J=5.7 Hz, 2H), 3.56 (s, IH), 2.21 (s, 6H).
Cap-20 to Cap-36 The following examples were prepared in similar fashion using the method described above:
Figure imgf000099_0001
Figure imgf000100_0001
Figure imgf000101_0001
Cap-37
Figure imgf000102_0001
Step 1. (R,S)-Ethyl 2-(quinolin-3-yI)-2-(N,N-dimethylamino)-acetate A mixture of ethyl N,N-dimethylaminoacetate (0.462 g, 3.54 mmol), K3PO4
(1.90 g, 8.95 mmol), Pd(I-Bu3P)2 (0.090 g, 0.176 mmol) and toluene (10 mL) was degassed with a stream of Ar bubbles for 15 minutes. The reaction mixture was then heated at 100 0C for 12 hours, after which it was cooled to room temperature and poured into H2O. The mixture was extracted with ethyl acetate (2x) and the combined organic phases were washed (H2O, brine), dried (Na2SO^, filtered, and concentrated in vacuo. The residue was purified first by reverse-phase preparative HPLC (Primesphere C-18, 30 x 100mm; CH3CN-H2O-S mM NH4OAc) and then by flash chromatography (SiO2/hexane-ethyl acetate, 1 : 1 ) to provide the title compound (0.128 g, 17%) as an orange oil 1H NMR (400 MHz, CDCl3) δ 8.90 (d, ./=2.0 Hz, IH), 8.32 (d, J-2.0 Hz, IH), 8.03-8.01 (m, 2H), 7.77 (ddd, J-8.3, 6.8, 1.5 Hz, IH), 7.62 (ddd, 7=8.3, 6.8, 1.5 Hz, IH), 4.35 (s, IH)5 4.13 (m, 2H), 2.22 (s, 6H), 1.15 (t, J=7.0 Hz, 3H)/ LCMS: Anal. Calcd. for C15H18N2O2: 258; found: 259 (M+H)+.
Step 2. (R,S) 2-(Quinolin-3-yl)-2-(N5N-dimethylamino)-acetic acid A mixture of (R,S)-ethyl 2-(quinolin-3-yl)-2-(N,N-dimethylamino)acetate
(0.122 g, 0.472 mmol) and 6M HCl (3 mL) was heated at 100 0C for 12 hours. The solvent was removed in vacuo to provide the dihydrochloride of the title compound (0.169 g, > 100%) as a light yellow foam. The unpurified material was used in ■ subsequent steps without further purification. LCMS: Anal. Calcd. for C13Hj^N2O2: 230; found: 231 (M+H)+. Cap-38
Figure imgf000103_0001
B
Figure imgf000103_0002
Step 1. (R)-((S)- 1 -Phenylethyl) 2-(dimethylamino)-2-(2-fluorophenyl)acetate and (S)- ((S)- 1 -phenyl ethyl) 2-(dimethylamino)-2-(2-fluorophenyl)acetate
To a mixture of (RS)-2-(dimethylamino)-2-(2-fluorophenyl)acetic acid (2.60 g, 13.19 mmol), DMAP (0.209 g, 1.71 mmol) and (S)-l-phenylethanol (2.09 g, 17.15 mmol) in CH2Cl2 (40 mL) was added EDCI (3.29 g, 17.15 mmol) and the mixture was allowed to stir at room temperature for 12 hours. The solvent was then removed in vacuo and the residue partitioned with ethyl acetate-I^O. The layers were separated, the aqueous layer was back-extracted with ethyl acetate (2x) and the combined organic phases were washed (H2O, brine), dried (Na2 S 04), filtered, and concentrated in vacuo. The residue was purified by silica gel chromatography (BIOTAGE®/0-50% diethyl ether-hexane). The resulting pure diastereomeric mixture was then separated by reverse-phase preparative HPLC (Primesphere C-18, 30 x 100mm; CH3CN-H2O-0.1% TFA) to give first (S)-I -phenethyl (R)-2- (dimethylamino)-2-(2-fiuorophenyl)acetate (0.501 g, 13%) and then (S)-I -phenethyl (S)-2-(dimethylamino)-2-(2-fluorophenyl)-acetate (0.727 g. 18%), both as their TFA salts. (S,R)-isomer: 1H NMR ^OO MHZ1 CD3OD) O 7.65-7.70 (m, IH)5 7.55-7.60 (ddd, /=9.4, 8.1, 1.5 Hz5 IH), 7.36-7.41 (m» 2H), 7.28-7.34 (m, 5H), 6.04 (q, /=6.5 Hz, IH), 5.60 (s, IH), 2.84 (s, 6H)5 1.43 (d, /=6.5 Hz, 3H). LCMS: Anal. Calcd. for C18H20FNO2: 301; found: 302 (M+H)+; (S,S)-isomer: 1H NMR (400 MHz, CD3OD) δ 7.58-7.63 (m, IH)1 7.18-7.31 (m, 6H), 7.00 (dd, /=8.5, 1.5 Hz, 2H), 6.02 (q, /=6.5 Hz, IH), 5.60 (s, IH), 2.88 (s, 6H), 1.54 (d, J=6.5 Hz, 3H). LCMS: Anal. Calcd. for C18H20FNO2: 301; found: 302 (M+H)+.
Step 2. (R)-2-(Dimethylamino)-2-(2-fluorophenyl)acetic acid
A mixture of (R)-((S)-l-phenylethyl) 2-(dimethylamino)-2-(2- fluoroρhenyl)acetate TFA salt (1.25 g, 3.01 mmol) and 20% Pd(OH)2/C (0.125 g) in ethanol (30 mL) was hydrogenated at room temperature and atmospheric pressure (H2 balloon) for 4 hours. The solution was then purged with Ar, filtered through diatomaceous earth (CELITE®), and concentrated in vacuo. This gave the title compound as a colorless solid (0.503 g, 98%). 1H NMR (400 MHz, CD3OD) δ 7.53- 7.63 (m, 2H), 7.33-7.38 (m, 2H), 5.36 (s, IH), 2.86 (s, 6H). LCMS: Anal. Calcd. for C10H12FNO2: 197; found: 198 (M+H)+.
The S-isomer could be obtained from (S)-((S)-l-phenylethyl) 2- (dimethylamino)-2-(2-fluorophenyl)acetate TFA salt in similar fashion.
Cap-39
Figure imgf000104_0001
A mixture of (R)-(2-chlorophenyl)glycine (0.300 g, 1.62 mmol), formaldehyde (35% aqueous solution, 0.80 mL, 3.23 mmol) and 20% Pd(OH)2/C (0.050 g) was hydrogenated at room temperature and atmospheric pressure (H2 balloon) for 4 hours. The solution was then purged with Ar, filtered through diatomaceous earth (CELITE®) and concentrated in vacuo. The residue was purified by reverse-phase preparative HPLC (Primesphere C-18, 30 x 100mm; CH3CN-H2O-0.1% TFA) to give the TFA salt of the title compound (R)-2~(dimethylamino)-2-(2-chlorophenyl)acetic acid as a colorless oil (0.290 g, 55%). 1H NMR (400 MHz, CD3OD) δ 7.59-7.65 (m, 2H)5 7.45-7.53 (m, 2H), 5.40 (s, IH), 2.87 (s, 6H). LCMS: Anal. Calcd. for C10H12ClNO2: 213; found: 214 (M+H)+.
Cap-40
Figure imgf000105_0001
cap-40
To an ice-cold solution of (R)-(2-chlorophenyl)glycine (1.00 g, 5.38 mmol) and NaOH (0.862 g, 21.6 mmol) in H2O (5.5 mL) was added methyl chloroformate
(1.00 mL; 13.5 mmol) dropwise. The mixture was allowed to stir at 00C for 1 hour and then it was acidified by the addition of cone. HCl (2.5 mL). The mixture was extracted with ethyl acetate (2x) and the combined organic phase was washed (H2O, brine), dried (Na2SO^, filtered, and concentrated in vacuo to give the title compound (R)-2-(methoxycarbonylamino)-2-(2-chlorophenyl)acetic acid as a yellow-orange foam (1.31 g, 96%). 1H NMR (400 MHz5 CD3OD) δ 7.39 - 7.43 (m, 2H), 7.29 - 7.31 (m, 2H), 5.69 (s, IH), 3.65 (s, 3H). LCMS: Anal. Calcd. for C10H10ClNO4: 243; found: 244 (M+H)+. Cap-41
Figure imgf000106_0001
To a suspension of 2-(2-(chloromethyl)phenyl)acetic acid (2.00 g, 10.8 mmol) in THF (20 mL) was added morpholine (1.89 g, 21.7 mmol) and the solution was stirred at room temperature for 3 hours. The reaction mixture was then diluted with ethyl acetate and extracted with H2O (2x). The aqueous phase was lyophilized and the residue was purified by silica gel chromatography (BIOTAGE®/0-10% methanol- CH2Cl2) to give the title compound 2-(2-(Morpholinomethyl)ρhenyl)acetic acid as a colorless solid (2.22 g, 87%). 1H NMR (400 MHz, CD3OD) δ 7.37-7.44 (m, 3H), 7.29-7.33 (m, IH), 4.24 (s, 2H), 3.83 (br s, 4H), 3.68 (s, 2H)S 3.14 (br s, 4H). LCMS: Anal Calcd. for C13Hj 7NO3: 235; found: 236 (M+H)+.
Cap-43 to Caρ-45
The following examples were similarly prepared using the method described for Cap-41:
Figure imgf000106_0002
Figure imgf000107_0001
Cap-45a
Figure imgf000107_0002
Cap-45a
HMDS (1.85 mL, 8.77 mmol) was added to a suspension of (R)-2-amino-2- phenylacetic acid p-toluenesulfonate (2.83 g, 8.77 mmol) in CH2Cl2 (10 mL) and the mixture was stirred at room temperature for 30 minutes. Methyl isocyanate (0.5 g, 8.77 mmol) was added in one portion stirring continued for 30 minutes. The reaction was quenched by addition of H2O (5 mL) and the resulting precipitate was filtered, washed with H2O and n-hexanes? and dried under vacuum. (R)-2-(3-methylureido)-2- phenylacetic acid (1.5 g; 82 %).was recovered as a white solid and it was used without further purification. 1H NMR (500 MHz, DMSO-d6) δ ppm 2.54 (d, J-4.88 Hz, 3H) 5.17 (d, J=7.93 Hz, IH) 5.95 (q, J=4.48 Hz; IH) 6.66 (d, J=7.93 Hz, IH) 7.26-7.38 (m, 5H) 12.67 (s, IH). LCMS: Anal. Calcd. for C10H12N2O3 208.08 found 209.121
(M+H)+; HPLC PHENOMENEX® C-18 3.0 X 46 mm, 0 to 100% B over 2 minutes, 1 minute hold time, A=90% water, 10% methanol, 0.1% TFA, B=10% water, 90% methanol, 0.1%. TFA, RT=I.38 min, 90% homogeneity index. Cap-46
Figure imgf000108_0001
The desired product was prepared according to the method described for Cap- 45a. 1H NMR (500 MHz, DMSOd6) δ ppm 0.96 (t, /=7.17 Hz, 3H) 2.94-3.05 (m, 2H) 5.17 (d, 7=7.93 Hz, IH) 6.05 (t, 7=5.19 Hz, IH) 6.60 (d, 7=7.63 Hz, IH) 7.26- 7.38 (m} 5H) 12.68 (s, IH). LCMS: Anal. Calcd. for C11H14N2O3 222.10 found
223.15 (M+H)+. HPLC XTERRA® C-18 3.0 x 506 mm, 0 to 100% B over 2 minutes, 1 minute hold time, A-90% water, 10% methanol, 0.2% H3PO4, B=I 0% water, 90% methanol, 0.2% H3PO4, RT=0.87 min, 90% homogeneity index.
Cap-47
Figure imgf000108_0002
B Cap-47
Step 1. (R)-fert-Butyl 2-(3,3-dimethylureido)-2-phenylacetate To a stirred solution of (R)-tert-butyI-2-animo-2-phenylacetate ( 1.0 g, 4.10 mmol) and Hunig's base (1.79 mL, 10.25 mmol) in DMF (40 mL) was added dimethylcarbamoyl chloride (0.38 mL, 4.18 mmol) dropwise over 10 minutes. After stirring at room temperature for 3 hours, the reaction was concentrated under reduced pressure and the resulting residue was dissolved in ethyl acetate. The organic layer was washed with H2O, IN aq. HCl and brine, dried (MgSO^, filtered and concentrated under reduced pressure. (R)-feτt-butyl 2-(3,3-dimethylureido)-2- phenylacetate was obtained as a white solid (0.86 g; 75%) and used without further purification. 1H NMR (500 MHz, DMSOd6) δ ppm 1.33 (s, 9H) 2.82 (s, 6H) 5.17 (d, J=7.63 Hz, IH) 6.55 (d, J=7.32 Hz, IH) 7.24-7.41 (m, 5H). LCMS: Anal. Caϊcd. for C15H22N2O3 278.16 found 279.23 (M+H)÷; HPLC PHEN0MENEX® LUNA C-18 4.6 x 50 mm, 0 to 100% B over 4 minutes, 1 minute hold time, A-90% water, 10% methanol, 0.1% TFA, B=I 0% water, 90% methanol, 0.1% TFA, RT-2.26 mm, 97% homogeneity index.
Step 2. (R)-2-(3,3-Dimethylureido)-2-phenylacetic acid To a stirred solution of ((R)-ter/-butyl 2-(3,3-dimethylureido)-2~phenylacetate
(0.86 g, 3.10 mmol) in CH2Cl2 (250 mL) was added TFA (15 niL) dropwise and the resulting solution was stirred at rt for 3 hours. The desired compound was then precipitated out of solution with a mixture of EtOAC :Hexanes (5 :20), filtered off and dried under reduced pressure. (R)-2-(3,3-dimethylureido)-2-phenylacetic acid was isolated as a white solid (0.59 g, 86%) and used without further purification. 1H NMR (500 MHz, DMSO-d6) δ ppm 2.82 (s, 6H) 5.22 (d, /=7.32 Hz9 IH) 6.58 (d, J-7.32 Hz, IH) 7.28 (t, J=IAl Hz, IH) 7.33 (t, J=7.32 Hz, 2H) 7.38-7.43 (m, 2H) 12.65 (s, IH). LCMS: Anal. Calcd. for C11H14N2O3: 222.24; found: 223.21 (M+H)+.
HPLC XTERRA® C-18 3.0 x 50 mm, 0 to 100% B over 2 minutes, 1 minute hold time, A-90% water, 10% methanol, 0.2% H3PO4, B-10% water, 90% methanol, 0.2% H3PO4, RT=0.75 min, 93% homogeneity index.
Cap-48
Figure imgf000109_0001
Step 1, (R)-ter/-Butyl 2-(3-cyclopentylureido)-2-phenylacetate
To a stirred solution of (R)-2-amino-2-phenylacetic acid hydrochloride (1.0 g, 4.10 mmol) and Hunig's base (1.0 mL, 6.15 mmol) in DMF (15 mL) was added cyclopentyl isocyanate (0.46 mL, 4.10 mmol) dropwise and over 10 minutes. After stirring at room temperature for 3 hours, the reaction was concentrated under reduced pressure and the resulting residue was taken up in ethyl acetate. The organic layer was washed with H2O and brine, dried (MgSO4), filtered, and concentrated under reduced pressure. (R)-fcrt-butyϊ 2-(3-cyclopentylureido)-2-phenylacetate was obtained as an opaque oil (1.32 g; 100 %) and used without further purification. 1H NMR (500 MHz, CD3Cl-D) δ ppm 1.50-1.57 (m, 2H) 1.58-1.66 (m, 2H) 1.87-1.97 (m, 2H) 3.89-3.98 (m, IH) 5.37 (s, IH) 7.26-7.38 (m, 5H). LCMS: Anal. Calcd. for C18H26N2O3 318.19 found 319.21 (M+H)+; HPLC XTERRA® C-18 3.0 x 50 mm, 0 to 100% B over 4 minutes, 1 minute hold time, A=90% water, 10% methanol, 0.1% TFA, B=10% water, 90% methanol, 0.1% TFA, RT-2.82 min, 96% homogeneity index.
Step 2. (R)-2-(3-Cycloρentylureido)-2-phenylacetic acid
To a stirred
Figure imgf000110_0001
2-(3-cyclopentylureido)-2-phenylacetate (131 g, 4.10 mmol) in CH2Cl2 (25 mL) was added TFA (4 mL) and trietheylsilane (1.64 mL; 10.3 mmol) dropwise, and the resulting solution was stirred at room temperature for 6 hours. The volatile components were removed under reduced pressure and the crude product was recrystaUized in ethyl acetate/pentanes to yield (R)-2-(3-cyclopentylureido)-2-phenyIacetic acid as a white solid (0.69 g, 64%). 1H NMR (500 MHz, DMSOd6) δ ppm 1.17-1.35 (m, 2H) 1.424.52 (m, 2H) 1.53-1.64 (m, 2H) 1.67-1.80 (m, 2H) 3.75-3.89 (m, IH) 5.17 (d, J-7.93 Hz, IH) 6.12 (d, J=7.32 Hz, IH) 6.48 (d, J-7.93 Hz, IH) 7.24-7.40 (m, 5H) 12.73 (s, IH). LCMS: Anal Calcd. for C14H18N2O3: 262.31; found: 263.15 (M+H)+. HPLC XTERRA® C-18
3.0 x 50 mm, 0 to 100% B over 2 minutes, 1 minute hold time, A=90% water, 10% methanol, 0.2% H3PO4, B=I 0% water, 90% methanol, 0.2% H3PO4, RT-1.24 min, 100% homogeneity index. Cap-49
Figure imgf000111_0001
cap-49
To a stirred solution of 2-(benzylamino)acetic acid (2.0 g, 12.1 mmol) in formic acid (91 mL) was added formaldehyde (6.94 mL, 93.2 mmol). After five hours at 70 0C5 the reaction mixture was concentrated under reduced pressure to 20 mL and a white solid precipitated. Following filtration, the mother liquors were collected and further concentrated under reduced pressure providing the crude product. Purification by reverse-phase preparative HPLC (XTERRA® 30 X 100 mm, detection at 220 nm, flow rate 35 mL/rnin, 0 to 35% B over 8 min; A- 90% water, 10 % methanol, 0.1% TFA, B=I 0% water, 90 % methanol, 0.1% TFA) provided the title compound 2-
(benzyl(methyl)-amino)acetic acid as its TFA salt (723 mg, 33%) as a colorless wax. 1H NMR (300 MHz, DMSOd6) δ ppm 2.75 (s, 3H) 4.04 (s, 2H) 4.34 (s, 2H) 7.29- 7.68 (m, 5H). LCMS: Anal. Calcd. for: C10H13NO2 175.05; Found: 180.20 (M+H)+
Cap-50
Figure imgf000111_0002
Cap-50
To a stirred solution of 3-methyl-2-(methylamino)butanoic acid (0.50 g, 3.81 mmol) in water (30 mL) was added K2CO3 (2.63 g, 19.1 mmol) and benzyl chloride
(1.32 g, 11,4 mmol). The reaction mixture was stirred at ambient temperature for 18 hours. The reaction mixture was extracted with ethyl acetate (30 mL x 2) and the aqueous layer was concentrated under reduced pressure providing the crude product which was purified by reverse-phase preparative HPLC (XTERRA® 30 x 100mm, detection at 220 run, flow rate 40 mL/min, 20 to 80% B over 6 min; A= 90% water, 10 % methanol, 0.1% TFA, B=I 0% water, 90 % methanol, 0.1% TFA) to provide 2- (benzyl(methyl)amino)-3-methylbutanoic acid, TFA salt (126 mg, 19%) as a colorless wax. IR NMR (500 MHz, DMSOd6) 5 ppm 0.98 (d, 3H) 1.07 (d, 3H) 2.33-2.48 (m, IH) 2.54-2.78 (m, 3H) 3.69 (s, IH) 4.24 (s, 2H) 7.29-7.65 (m, 5H). LCMS: Anal. Calcd. for; C13H19NO2 221.14; Found: 222.28 (M+H)+.
Cap-51
Figure imgf000112_0001
Na2CO3 (1.83 g, 17.2 mmol) was added to NaOH (33 mL of 1M/H2O, 33 mmol) solution of L-valine (3.9 g, 33.29 mmol) and the resulting solution was cooled with ice- water bath. Methyl chloroformate (2.8 mL, 36.1 mmol) was added dropwise over 15 mm, the cooling bath was removed and the reaction mixture was stirred at ambient temperature for 3.25 hr. The reaction mixture was washed with ether (50 mL, 3x), and the aqueous phase was cooled with ice-water bath and acidified with concentrated HCl to a pH region of 1-2, and extracted with CH2Cl2 (50 mL, 3x). The organic phase was dried (MgSO4) and evaporated in vacuo to afford Cap-51 as a white solid (6 g). 1H NMR for the dominant rotamer (DMSO~d6, δ = 2.5 ppm, 500 MHz): 12.54 (s, IH), 7.33 (d, /=8.6, IH), 3.84 (dd, /=8.4, 6.0, IH), 3.54 (s, 3H), 2.03 (m, IH), 0.87 (m, 6H). HRMS: Anal. Calcd. for [M+H]÷ C7H14NO4: 176.0923; found 176.0922
Cap 51 (alternate route)
Figure imgf000112_0002
DlEA (137.5 mL, 0.766 mol) was added to a suspension of (S)-tert~butyl 2- amino-3-methylbutanoate hydrochloride (75.0 g, 0.357 mol) in THF (900 mL), and the mixture was cooled to 0 0C (ice/water bath). Methyl chloroformate (29.0 mL, 0.375 mol) was added dropwise over 45 min, the cooling bath was removed and the heterogeneous mixture was stirred at ambient temperature for 3 h. The solvent was removed under diminished pressure and the residue partitioned between EtOAc and water (I L each). The organic layer was washed with H2O (1 L) and brine (I L), dried (MgSO4), filtered and concentrated under diminished pressure. The crude material was passed through a plug of silica gel (1 kg), eluting with hexanes (4 L) and 15:85 EtOAc/hexanes (4 L) to afford (S)-tert-butyl 2-(methoxycarbonylamino)~3- methylbutanoate as a clear oil (82.0 g, 99% yield). 1H-NMR (500 MHz, DMSO-4, δ - 2.5 ppm) 7.34 (d, J= 8.6, 1 H), 3.77 (dd, J= 8.6, 6.1, 1 H), 3.53 (s, 3 H), 1.94 - 2.05 (m, 1 H), 1.39 (s, 9 H), 0.83 - 0.92 (m, 6 H). 13C-NMR (126 MHz, DMSO-^6, δ = 39.2 ppm) 170.92, 156.84, 80.38, 60.00, 51.34, 29.76, 27.62, 18.92, 17.95. LC/MS: [M+Na]+ 254.17.
Trifluoroacetic acid (343 niL, 4.62 mol) and Et3SiH (142 mL, 0.887 mol) were added sequentially to a solution of (S)-tert-butyl 2-(methoxycarbonylamino)~3- methylbutanoate (82.0 g, 0.355 mol) in CH2Cl2 (675 mL), and the mixture was stirred at ambient temperature for 4 h. The volatile component was removed under diminished pressure and the resultant oil triturated with petroleum ether (600 mL) to afford a white solid, which was filtered and washed with hexanes (500 mL) and petroleum ether (500 mL). Recrystallization from EtO Ac/petroleum ether afforded Cap-51 as white flaky crystals (54.8 g, 88 % yield). MP = 108.5-109.5 0C. 1H NMR (500 MHz, DMSO-J6, δ = 2.5 ppm) 12.52 (s, 1 H), 7.31 (d, J= 8.6, 1 H), 3.83 (dd, J = 8.6, 6.1, 1 H), 3.53 (s, 3 H), 1.94 - 2.07 (m, 1 H), 0.86 (dd, J- 8.9, 7.0, 6 H). 13C NMR (126 MHz, DMSO-J6, 5 = 39.2 ppm) 173.30, 156.94, 59.48, 51.37, 29.52, 19.15, 17.98. LC/MS: [MH-H]+ = 176.1 1. Anal. Calcd. for C7HnNO4: C, 47.99; H, 7.48; N, 7.99. Found: C, 48.17; H, 7.55; N, 7.99. Optical Rotation: [D] D = -4.16 (12.02 mg/mL; MeOH). Optical purity: >99.5 % ee. Note: the optical purity assessment was made on the methyl ester derivative of Cap-51, which was prepared under a standard TMSCHN2 (benzene/MeOH) esterification protocol. HPLC analytical conditions: column, ChiralPak AD-H (4.6 x 250mm, 5μm); solvent, 95% heptane / 5% IPA (isocratic); flow rate, 1 mL/min; temperature, 35 0C; UV monitored at 205 nm. [Note: Cap 51 can also be purchased from Flamm.]. Cap-52
Figure imgf000114_0001
Cap-52 was synthesized from L-alanine according to the procedure described for the synthesis of Cap-51. For characterization purposes, a portion of the crude material was purified by a reverse phase HPLC (^O/methanol/TFA) to afford Cap- 52 as a colorless viscous oil. 1H NMR (DMSOd6, 6 - 2.5 ppm, 500 MHz): 12.49 (br s, IH), 7.43 (d, J=I.31 0.88H), 7.09 (app br s, 0.12H), 3.97 (m, IH), 3.53 (s, 3H), 1.25 (d, J=7.3, 3H).
Cap-53 to Cap-64
Cap- 53 to Cap-64 were prepared from appropriate starting materials according to the procedure described for the synthesis of Cap-51, with noted modifications if any.
:
Figure imgf000114_0002
Figure imgf000115_0001
Figure imgf000116_0001
Figure imgf000117_0001
Figure imgf000118_0002
Cap-65
Figure imgf000118_0001
Methyl chloroformate (0.65 mL, 8.39 mmol) was added dropwise over 5 min to a cooled (ice-water) mixture OfNa2CO3 (0.449 g, 4,23 mmol), NaOH (8.2 mL of
1M/H2O, 8.2 mmol) and (5)-2-amino-3-hydroxy~3-methylbutanoic acid (1.04 g. 7.81 mmol). The reaction mixture was stirred for 45 min, and then the cooling bath was removed and stirring was continued for an additional 3.75 hr. The reaction mixture was washed with CH2Cl2, and the aqueous phase was cooled with ice-water bath and acidified with concentrated HCl to a pH region of 1-2. The volatile component was removed in vacuo and the residue was taken up in a 2: 1 mixture of MeOH/CH2Cl2 (15 mL) and filtered, and the filterate was rotervaped to afford Cap-65 as a white semi-viscous foam (1.236 g). *H NMR (DMSO-d6, δ = 2.5 ppm, 400 MHz): δ 6.94 (d, J - 8.5, 0.9 H), 6.53 (br s, 0.1H), 3.89 (d, / = 8.8, IH), 2.94 (s, 3H), 1.15 (s, 3H), 1.13 (s, 3H).
Cap- 66 and Cap-67 were prepared from appropriate commercially available starting materials by employing the procedure described for the synthesis of Cap-65.
Cap-66
Figure imgf000119_0001
1H NMR (DMSOd6, δ = 2.5 ppm, 400 MHz): δ 12.58 (br s, IH), 7.07 (d, J =
8.35 0.13H), 6.81 (d, J = 8.8, 0.67H), 4.10-4.02 (m, 1.15H), 3.91 (dd, J = 9.1, 3.5, 0.85H), 3.56 (s, 3H), 1.09 (d, J = 6.2, 3H). [Note: only the dominant signals of NH were noted].
Cap-67
Figure imgf000119_0002
1H NMR (DMSOd6, δ = 2.5 ppm, 400 MHz): 12.51 (br s, IH), 7.25 (d, J = 8.4, 0.75H), 7.12 (br d, J = 0.4, 0.05H), 6.86 (br s; 0.08H), 3.95-3.85 (m, 2H), 3.54 (s, 3H)5 1.08 (d, J - 6.3, 3H). [Note: only the dominant signals of NH were noted].
Cap-68
Figure imgf000119_0003
Methyl chloroformate (0.38 ml, 4.9 mmol) was added drop-wise to a mixture of IN NaOH (aq) (9.0 ml, 9.0 mmol), IM NaHCO3 (aq) (9.0 ml, 9.0 mol), L-aspartic acid β-benzyl ester (1.0 g, 4.5 mmol) and Dioxane (9 ml). The reaction mixture was stirred at ambient conditions for 3 hr, and then washed with Ethyl acetate (50 ml, 3 x). The aqueous layer was acidified with 12N HCl to a pH ~ 1-2, and extracted with ethyl acetate (3 x 50 ml). The combined organic layers were washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo to afford Cap-68 as a light yellow oil (1.37 g; mass is above theoretical yield, and the product was used without further purification). 1H NMR (DMSO-d6, δ - 2.5 ppm, 500 MHz): δ 12.88 (br s, IH), 7.55 (d, J = 8.5, IH), 7.40-7.32 (m, 5H), 5.13 (d, J = 12.8, IH), 5.10 (d, J = 12.9, IH), 4.42-4.38 (m, IH), 3.55 (s, 3H), 2.87 (dd, J = 16.2, 5.5, IH), 2.71 (dd, J=16.2, 8.3, IH). LC (Cond. 2): RT = 1.90 min; LC/MS: Anal. Calcd. For [M+H]+ C13H16NO6: 282.10; found 282.12.
Cap-69a and Cap-69b
Cap-69a: (R)-enantiomer Cap-69b: (S)-enantiomer
Figure imgf000120_0001
NaCNBH3 (2.416 g, 36.5 mmol) was added in batches to a chilled (~15°C) water (17 mL)/MeOH (10 mL) solution of alanine (1.338 g, 15.0 mmol). A few minutes later acetaldehyde (4.0 mL, 71.3 mmol) was added drop-wise over 4 min, the cooling bath was removed, and the reaction mixture was stirred at ambient condition for 6 hr. An additional acetaldehyde (4.0 mL) was added and the reaction was stirred for 2 hr. Concentrated HCl was added slowly to the reaction mixture until the pH reached ~ 1.5, and the resulting mixture was heated for 1 hr at 40 0C. Most of the volatile component was removed in vacuo and the residue was purified with a DOWEX® 50WX8- 100 ion-exchange resin (column was washed with water, and the compound was eluted with dilute NH4OH, prepared by mixing 18 ml OfNH4OH and
282 ml of water) to afford Cap-69 (2.0 g) as an off-white soft hygroscopic solid. 1H NMR (DMSO-d6, δ = 2.5 ppm, 400 MHz): δ 3.44 (q, J = 7.1 , IH), 2.99-2.90 (m, 2H),
2.89-2.80 (m, 2H), 1.23 (d> J - 7.1 , 3H), 1.13 (t, J = 7.3, 6H). Cap-70 to Cap-74x
Cap-70 to Cap-74x were prepared according to the procedure described for the synthesis of Cap-69 by employing appropriate starting materials.
Figure imgf000121_0001
Cap-75
Figure imgf000122_0001
Cap-75, step a
Figure imgf000122_0002
NaBH3CN (1.6 g, 25.5 mmol) was added to a cooled (ice/water bath) water
(25 miymethanol (15 ml) solution of H-D-Ser-OBzl HCl (2.0 g, 8.6 mmol). Acetaldehyde (1.5 ml, 12.5 mmol) was added drop-wise over 5 min, the cooling bath was removed, and the reaction mixture was stirred at ambient condition for 2 hr. The reaction was carefully quenched with 12N HCl and concentrated in vacuo. The residue was dissolved in water and purified with a reverse phase HPLC (MeOH/H2O/TFA) to afford the TFA salt of (R)-benzyl 2-(diethylammo)-3- hydroxypropanoate as a colorless viscous oil (1.9 g). 1H NMR (DMS0-d6> δ = 2.5 ppm, 500 MHz): δ 9.73 (br s, IH), 7.52-7.36 (m, 5H)9 5.32 (d, J = 12.2, IH), 5.27 (d, J = 12.5, IH), 4.54-4.32 (m, IH), 4.05-3.97 (m, 2H), 3.43-3.21 (m, 4H), 1.23 (t, J = 7.2, 6H). LC/MS (Cond. 2): RT - 1.38 min; LC/MS: Anal. Calcd. for [M+H]+ C14H22NO3: 252.16; found 252.19. Cap-75
NaH (0.0727 g, 1.82 mmol5 60%) was added to a cooled (ice-water) THF (3.0 mL) solution of the TFA salt (R)-benzyl 2-(diethylamino)-3-hydroxypropanoate (0.3019 g, 0.8264 mmol) prepared above, and the mixture was stirred for 15 min. Methyl iodide (56 μL, 0.90 mmol) was added and stirring was continued for 18 hr while allowing the bath to thaw to ambient condition. The reaction was quenched with water and loaded onto a MeOH pre-conditioned MCX (6 g) cartridge, and washed with methanol followed by compound elution with 2N N^/Methanol. Removal of the volatile component in vacuo afforded Cap-75, contaminated with (R)- 2-(diethylamino)-3-hydroxypropanoic acid, as a yellow semi-solid (100 mg). The product was used as is without further purification.
Cap-76
Figure imgf000123_0001
NaCNBH3 ( 1.60 g, 24.2 mmol) was added in batches to a chilled (-15 0C) water/MeOH (12 mL each) solution of (S)-4-ammo-2-(terf-butoxycarbonylamino) butanoic acid (2.17 g, 9.94 mmol). A few minutes later acetaldehyde (2.7 mL, 48.1 mmol) was added drop-wise over 2 min, the cooling bath was removed, and the reaction mixture was stirred at ambient condition for 3.5 hr. An additional acetaldehyde (2.7 mL, 48.1 mmol) was added and the reaction was stirred for 20.5 hr. Most of the MeOH component was removed in vacuo, and the remaining mixture was treated with concentrated HCl until its pH reached - 1.0 and then heated for 2 hr at 400C. The volatile component was removed in vacuo, and the residue was treated with 4 M HCl/dioxane (20 mL) and stirred at ambient condition for 7.5 hr. The volatile component was removed in vacuo and the residue was purified with
DOWEX® 50WX8-100 ion-exchange resin (column was washed with water and the compound was eluted with dilute NH4OH, prepared from 18 ml OfNH4OH and 282 ml of water) to afford intermediate (S)-2-amino~4-(diethylamino)butanoic acid as an off-white solid (1.73 g).
Methyl chloroformate (0.36 mL, 4.65 mmol) was added drop-wise over 11 min to a cooled (ice-water) mixture OfNa2CO3 (0.243 g, 2.29 mmol), NaOH (4.6 mL of 1M/H2O, 4.6 mmol) and the above product (802.4 mg). The reaction mixture was stirred for 55 min, and then the cooling bath was removed and stirring was continued for an additional 5.25 hr. The reaction mixture was diluted with equal volume of water and washed with CH2Cl2 (30 mL, 2x), and the aqueous phase was cooled with ice-water bath and acidified with concentrated HCl to a pH region of 2. The volatile component was then removed in vacuo and the crude material was free-based with MCX resin (6.0 g; column was washed with water, and sample was eluted with 2.0 M NH3MeOH) to afford impure Cap-76 as an off-white solid (704 mg). 1H NMR (MeOH-(J4, δ = 3.29 ppm, 400 MHz): δ 3.99 (dd, J - 7.5, 4.7, IH), 3.62 (s, 3H)5 3.25- 3.06 (m, 6H), 2.18-2.09 (m, IH), 2.04-1.96 (m, IH), 1.28 (t, J = 7.3, 6H). LC/MS: Anal. Calcd. for [M+H]+ C10H2IN2O4: 233.15; found 233.24.
Cap-77a and Cap-77b
Cap-77a: enantiomer-1 Cap-77b: enantiomer-2
Figure imgf000124_0001
The synthesis of Caρ-77 was conducted according to the procedure described for Cap-7 by using 7-azabicyclo[2,2.1]heptane for the SN2 displacement step, and by effecting the enantiomeric separation of the intermediate benzyl 2-(7- azabicyclo[2.2.1]heptan-7-yl)~2-phenylacetate using the following condition: the intermediate (303.7 mg) was dissolved in ethanol, and the resulting solution was injected on a chiral HPLC column (Chiracel AD-H column, 30 x 250 mm, 5 um) eluting with 90% CO2-10% EtOH at 70 mL/min, and a temperature of 35 0C to provide 124.5 mg of enantiomer-1 and 133.8 mg of enantiomer-2. These benzyl esters were hydrogenolysed according to the preparation of Cap-7 to provide Caρ-77: 1H NMR (DMSO-Ci6, δ = 2.5 ppm, 400 MHz): δ 7.55 (m, 2H), 7.38-7.30 (m, 3H), 4.16 (s, IH), 3.54 (app br s, 2H), 2.08-1.88 (m, 4 H), 1.57-1.46 (m, 4H). LC (Cond. 1): RT - 0.67 min; LC/MS: Anal. Calcd. for [M+H]+ C14H18NO2: 232.13; found 232.18. HRMS: Anal. Calcd. for [M+H]+ C14H18NO2: 232.1338; found 232.1340.
Figure imgf000125_0001
NaCNBH3 (0.5828 g, 9.27 mmol) was added to a mixture of the HCl salt of
(/?)-2-(ethylamino)-2-phenylacetic acid (an intermediate in the synthesis of Cap-3; 0.9923 mg, 4.60 rnmol) and (l-ethoxycyclopropoxy^rimethylsilane (1.640 g, 9.40 mmol) in MeOH (10 mL), and the semi-heterogeneous mixture was heated at 50 0C with an oil bath for 20 hr. More (l-ethoxycyclopropoxy)trimethylsilane (150 mg, 0.86 mmol) and NaCNBH3 (52 mg, 0,827 mmol) were added and the reaction mixture was heated for an additional 3.5 hr. It was then allowed to cool to ambient temperature and acidified to a ~ pH region of 2 with concentrated HCl, and the mixture was filtered and the filtrate was rotervaped. The resulting crude material was taken up in ϊ-PrOH (6 mL) and heated to effect dissolution, and the non-dissolved part was filtered off and the filtrate concentrated in vacuo. About 1/3 of the resultant crude material was purified with a reverse phase HPLC (H2O/MeOH/TFA) to afford the TFA salt of Cap-78 as a colorless viscous oil (353 mg). 1H NMR (DMSO-d6, δ = 2.5 ppm, 400 MHz; after D2O exchange): δ 7.56-7.49 (m, 5H), 5.35 (S, IH), 3.35 (m, IH), 3.06 (app br s, IH), 2.66 (m, IH), 1.26 (t, J - 7.3, 3H), 0.92 (m, IH), 0.83-0.44 (m, 3H). LC (Cond. 1): RT = 0.64 min; LC/MS: Anal. Calcd. for [M+H]+ C13H18NO2: 220.13; found 220.21. HRMS: Anal. Calcd. for [MH-H]+ C13H18NO2: 220.1338; found 220.1343.
Figure imgf000126_0001
Ozone was bubbled through a cooled (-78 0C) CH2Cl2 (5.0 mL) solution Cap- 55 (369 mgj 2.13 mmol) for about 50 min until the reaction mixture attained a tint of blue color. Me2S (10 pipet drops) was added, and the reaction mixture was stirred for 35 min. The -78 0C bath was replaced with a -10 0C bath and stirring continued for an additional 30 min, and then the volatile component was removed in vacuo to afford a colorless viscous oil.
NaBH3CN (149 mg, 2.25 mmol) was added to a MeOH (5.0 mL) solution of the above crude material and morpholine (500 μL, 5.72 mmol) and the mixture was stirred at ambient condition for 4 hr. It was cooled to ice- water temperature and treated with concentrated HCl to bring its pH to -2.0, and then stirred for 2.5 hr. The volatile component was removed in vacuo, and the residue was purified with a combination of MCX resin (MeOH wash; 2.0 N NH3MeOH elution) and a reverse phase HPLC (H2O/MeOH/TFA) to afford Cap-79 containing unknown amount of morpholine.
In order to consume the morpholine contaminant, the above material was dissolved in CH2Cl2 (1.5 mL) and treated with Et3N (0.27 mL, 1.94 mmol) followed by acetic anhydride (0.10 mL, 1.06 mmol) and stirred at ambient condition for 18 hr. THF ( 1.0 mL) and H2O (0.5 mL) were added and stirring continued for 1.5 hr. The volatile component was removed in vacuo, and the resultant residue was passed through MCX resin (MeOH wash; 2.0 N NH3/MeOH elution) to afford impure Cap- 79 as a brown viscous oil, which was used for the next step without further purification. Cap-80a and Cap-80b
Cap-SOa: S/S-diastereomer Cap~80b: S/R-diastereomer
Figure imgf000127_0001
SOCI2 (6.60 mL, 90.5 mmol) was added drop-wise over 15 mm to a cooled (ice-water) mixture of (S)-3-amino-4-(benzyloxy)-4-oxobutanoic acid (10.04 g, 44.98 mmol) and MeOH (300 mL), the cooling bath was removed and the reaction mixture was stirred at ambient condition for 29 hr. Most of the volatile component was removed in vacuo and the residue was carefully partitioned between EtOAc (150 mL) and saturated NaHCO3 solution. The aqueous phase was extracted with EtOAc (150 mL, 2x), and the combined organic phase was dried (MgSO4), filtered, and concentrated in vacuo to afford (S)-I -benzyl 4-methyl 2-aminosuccinate as a colorless oil (9.706 g). 1H NMR (DMSO-d6, δ = 2.5 ppm, 400 MHz): δ 7.40-7.32 (m, 5H), 5.11 (s, 2H), 3.72 (app t, J - 6.6, IH), 3.55 (s, 3H), 2.68 (dd, J = 15.9, 6.3, IH), 2.58 (dd, J - 15.9, 6.8, IH), 1.96 (s, 2H). LC (Cond. 1): RT - 0.90 min; LCMS: Anal. Calcd. for [M+H]+ C12H16NO4: 238.11 ; found 238.22. Pb(NO3)2 (6.06 g, 18.3 mmol) was added over 1 min to a CH2Cl2 (80 mL) solution of (S)-I -benzyl 4-melhyl 2-aminosuccinate (4.50 g, 19.0 mmol), 9-bromo-9- phenyl-9H-fluorene (6.44 g, 20.0 mmol) and Et3N (3.0 mL, 21.5 mmol), and the heterogeneous mixture was stirred at ambient condition for 48 hr. The mixture was filtered and the filtrate was treated with MgSO4 and filtered again, and the final filtrate was concentrated. The resulting crude material was submitted to a
BIOTAGE® purification (350 g silica gel, CH2Cl2 elution) to afford (S)-I -benzyl 4- methyl 2-(9-phenyl-9H-fluoren-9-ylamino)succinate as highly viscous colorless oil (7.93 g). 1H NMR (DMSO-O6, δ = 2.5 ppm, 400 MHz): δ 7.82 (m, 2H), 7.39-7.13 (m, 16H), 4.71 (d, J = 12.4, IH), 4.51 (d, J = 12.6, IH), 3.78 (d, J - 9.1, NH), 3.50 (s, 3H), 2.99 (m, IH), 2.50-2.41 (m, 2H, partially overlapped with solvent). LC (Cond, 1): RT = 2.16 min; LC/MS: Anal. Calcd. for [M+H]+ C31H2SNO4: 478.20; found 478.19.
LiHMDS (9.2 mL of 1.0 M/THF, 9.2 mmol) was added drop-wise over 10 min to a cooled (-78 0C) THF (50 mL) solution of (S)-I -benzyl 4-methyl 2-(9-phenyl-9H- fluoren-9-ylamino)succinate (3.907 g, 8.18 mmol) and stirred for ~1 hr. MeI (0.57 mL, 9.2 mmol) was added drop-wise over 8 min to the mixture, and stirring was continued for 16.5 hr while allowing the cooling bath to thaw to room temperature. After quenching with saturated NH4Cl solution (5 mL), most of the organic component was removed in vacuo and the residue was partitioned between CH2CI2 (100 mL) and water (40 mL). The organic layer was dried (MgSO4), filtered, and concentrated in vacuo, and the resulting crude material was purified with a BIOTAGE® (350 g silica gel; 25% EtOAc/hexanes) to afford 3.65 g of a 2S/3S and 2S/3R diastereomeric mixtures of 1 -benzyl 4-methyl 3-methyl-2-(9-phenyl-9H- fluoren-9-ylammo)succinate in —1.0:0.65 ratio (1H NMR). The stereochemistry of the dominant isomer was not determined at this juncture, and the mixture was submitted to the next step without separation. Partial 1H NMR data (DMSO-d6, δ = 2.5 ppm, 400 MHz): major diastereomer, δ 4.39 (d, J = 12.3, IH Of CH2), 3.33 (s, 3H5 overlapped with H2O signal), 3.50 (d, J = 10.9, NH), 1.13 (d, J - 7.1, 3H); minor diastereomer, δ 4.27 (d, J = 12.3, IH of CH2), 3.76 (d, J - 10.9, NH), 3.64 (s, 3H), 0.77 (d, J = 7.0, 3H). LC (Cond. I): RT - 2.19 min; LC/MS: Anal. Calcd. for [M+H]+ C32H30NO4: 492.22; found 492.15.
Diisobutylaluminum hydride (20.57 ml of 1.0 M in hexanes, 20.57 mmol) was added drop-wise over 10 min to a cooled (-78 0C) THF (120 mL) solution of (2S)-I- benzyl 4-methyl 3-methyl-2-(9-phenyl-9H-fluoren-9-ylamino)succinate (3.37 g, 6.86 mmol) prepared above, and stirred at -78 0C for 20 hr. The reaction mixture was removed from the cooling bath and rapidly poured into ~1M H3PO4ZH2O (250 mL) with stirring, and the mixture was extracted with ether (100 mL, 2x). The combined organic phase was washed with brine, dried (MgSO4), filtered and concentrated in vacuo. A silica gel mesh of the crude material was prepared and submitted to chromatography (25% EtOAc/hexanes; gravity elution) to afford 1.1 g of (2S,3S)- benzyl 4-hydroxy~3-methyl-2-(9-phenyl-9H-fluoren-9-ylamino)butanoate, contaminated with benzyl alcohol, as a colorless viscous oil and (2S,3R)-benzyl 4- hydroxy-3-methyl-2-(9-phenyl-9H-fluoren-9-ylamino)-butanoate containing the (2S,3R) stereoisomer as an impurity. The later sample was resubmitted to the same column chromatography purification conditions to afford 750 mg of purified material as a white foam. [Note: the (2S3 3S) isomer elutes before the (2S,3R) isomer under the above condition]. (2S, 3S) isomer: 1H NMR (DMSOd6, δ = 2.5 ppm, 400 MHz): 7.81 (m, 2H), 7.39-7.08 (m, 16H), 4.67 (d, / = 12.3, IH), 4,43 (d, J = 12.4, IH)5 4.21 (app t, J - 5.2, OH), 3.22 (d, J = 10.1, NH), 3.17 (m, IH), 3.08 (m, IH), -2.5 (m, IH, overlapped with the solvent signal), 1.58 (m, IH), 0.88 (d, J - 6.8, 3H). LC (Cond. 1): RT = 2.00 min; LC/MS: Anal. Calcd. for [M+H]+ C3 iH30NO3: 464.45; found 464.22. (2S, 3R) isomer: 1H NMR (DMSOd6, δ - 2.5 ppm, 400 MHz): 7.81 (d, J -
7.5, 2H), 7.39-7.10 (m, 16H), 4.63 (d, J= 12.1 , IH), 4.50 (app t, J = 4.9, IH), 4.32 (d, J - 12.1, IH), 3.59-3.53 (m, 2H), 3.23 (m, IH), 2.44 (dd, J = 9.0, 8.3, IH), 1.70 (m, IH), 0.57 (d, J - 6.8, 3H). LC (Cond. 1): RT - 1.92 min; LC/MS: Anal. Calcd. for [M+H]+ C31H30NO3: 464.45; found 464.52.
The relative stereochemical assignments of the DIBAL-reduction products were made based on NOE studies conducted on lactone derivatives prepared from each isomer by employing the following protocol: LiHMDS (50 μL of 1.0 M/THF, 0.05 mmol) was added to a cooled (ice-water) THF (2.0 mL) solution of (2S,3S)- benzyl 4-hydroxy-3-methyl-2-(9-phenyl-9H'-fluoren-9-ylamino)-butanoate (62.7 mg, 0.135 mmol), and the reaction mixture was stirred at similar temperature for ~2 hr. The volatile component was removed in vacuo and the residue was partitioned between CΗ2CI2 (30 mL), water (20 mL) and saturated aqueous NH4CI solution (1 mL). The organic layer was dried (MgSO^, filtered, and concentrated in vacuo, and the resulting crude material was submitted to a BIOTAGE® purification (40 g silica gel; 10-15% EtOAc/hexanes) to afford (3S,4S)-4-methyl-3-(9-phenyl-9i/-fluoren-9- ylamino)dihydrofuran-2(3/f)-one as a colorless film of solid (28.1 mg). (2S,3R)- benzyl 4-hydroxy-3-methyl-2-(9-ρhenyl-9i:f-fiuoren-9-ylammo)butanoate was elaborated similarly to (3S,4R)-4-methyl-3-(9-ρhenyl-9/f-fiuoren-9- ylamino)dihydrofuran-2(3H)-one. (3S,4S)~lactone isomer: 1H NMR (DMSO-d6, δ = 2.5 ppm, 400 MHz), 7.83 (d, J = 7.5, 2H)5 7.46-7.17 (m, HH), 4.14 (app t, J = 8.3, IH), 3.60 (d, J - 5.8, NH), 3.45 (app t, J = 9.2, IH), -2.47 (m, IH, partially overlapped with solvent signal), 2.16 (m, IH), 0.27 (d, J = 6.6, 3H). LC (Cond. J): RT = 1.98 mm; LC/MS: Anal Calcd. for [M+Na]+ C24H21NNaO2: 378.15; found 378.42. (3S,4R)-lactone isomer: 1H NMR (DMSO-d6, δ = 2.5 ppm, 400 MHz), 7.89 (U1 J = 7.6, IH), 7.85 (d, J = 7.3, IH), 7.46-7.20 (m, 1 IH), 3.95 (dd, J - 9.1, 4.8, IH), 3.76 (d, J = 8.8, IH), 2.96 (d} J = 3.0, NH), 2.92 (dd, J = 6.8, 3, NCH), 1.55 (m, IH), 0.97 (d, ,/ - 7.0, 3H). LC (Cond. 1): RT = 2.03 min; LC/MS: Anal. Calcd. for [M+Na]+ C24H2INNaO2: 378.15; found 378.49. BDMS-Cl (48 mg, 0.312 mmol) followed by imidazole (28.8 nig, 0.423 mmol) were added to a CH2Cl2 (3 ml) solution of (2S,3S)-benzyl 4-hydroxy-3- methyl-2-(9-phenyl-9H-fluoren-9-ylamino)butanoate (119.5 mg, 0.258 mmol), and the mixture was stirred at ambient condition for 14.25 hr, The reaction mixture was then diluted with CH2Cl2 (30 mL) and washed with water (15 mL), and the organic layer was dried (MgSO4), filtered, and concentrated in vacuo. The resultant crude material was purified with a BIOT AGE® (40 g silica gel; 5% EtOAc/hexanes) to afford (2S,3S)-benzyl 4-(ter?-butyldimethylsilyloxy)-3-methyl-2-(9-phenyl-9H- fluoren-9-ylaraino)butanoate, contaminated with TBDMS based impurities, as a colorless viscous oil (124.4 mg). (2S,3R)-benzyl 4-hydroxy-3 -methyl- 2- (9-phenyl- 9H-fluoren-9-ylamino)butanoate was elaborated similarly to (2S,3R)-benzyl 4-(fer^- butyldimethylsilyloxy)-3-methyl-2-(9-phenyl-9H-fluoren-9-ylamino)butanoate. (2S,3S)-siIyl ether isomer: ^H NMR (DMSO-d6, δ - 2.5 ppm, 400 MHz), 7.82 (d, J - 4.1, IH), 7.80 (d, J - 4.0, IH), 7.38-7.07 (m, 16 H)5 4.70 (d, J = 12.4, IH), 4.42 (d, J = 12.3, IH), 3.28-3.19 (m, 3H), 2.56 (dd, J = 10.1, 5.5, IH), 1.61 (no, IH), 0.90 (d, J - 6.8, 3H), 0.70 (s, 9H), -0.13 (s, 3H), -0.16 (s, 3H). LC (Cond. 1, where the run time was extended to 4 min): RT = 3.26 min; LC/MS: Anal. Calcd. for [M+H]+ C37H44NO3Si: 578.31 ; found 578.40. (2S,3R)-silyl ether isomer: 1H NMR (DMSO- d6, δ = 2.5 ppm, 400 MHz), 7.82 (d5 J = 3.0, IH), 7.80 (d, J = 3.1, IH), 7.39-7.10 (m, 16H), 4.66 (d, J = 12.4, IH), 4.39 (d, J - 12.4, IH), 3.61 (dd, J = 9.9, 5.6, IH), 3.45 (d, J = 9.5, IH), 3.41 (dd, J = 10, 6.2, IH)5 2.55 (del, J - 9.5, 7.3, IH), 1.74 (m, IH), 0.77 (s; 9H), 0.61 (d, J = 7.1, 3H), -0.06 (s, 3H), -0.08 (s, 3H).
A balloon of hydrogen was attached to a mixture of (2S,3S)-benzyl 4-(ter^- butyldimethylsilyloxy)-3"methyl-2-(9-phenyl-9Jϊ-flxιoren-9-ylamino)butanoate (836 mg, 1.447 mmol) and 10% Pd/C (213 mg) in EtOAc ( 16 mL) and the mixture was stirred at room temperature for ~ 21 hr, where the balloon was recharged with H2 as necessary, The reaction mixture was diluted with CH2Cl2 and filtered through a pad of diatomaceous earth (CELITE®-545), and the pad was washed with EtOAc (200 mL), EtOAc/MeOH (1 :1 mixture, 200 mL) and MeOH (750 mL). The combined organic phase was concentrated, and a silica gel mesh was prepared from the resulting crude material and submitted to a flash chromatography (8:2:1 mixture of EtOAc/i- PrOH/H2O) to afford (2S,3S)-2-amino-4-(tert-butyldimethylsilyloxy)-3- methylbutanoic acid as a white fluffy solid (325 mg). (2S,3R)-benzyl 4-(terϊ- butyldimethylsilyloxy)-3-methyl-2-(9-phenyl-9H-fluoren-9-ylamino)butanoate was similarly elaborated to (2S ,3R)-2-amino-4-(tert-butyldimethylsilyloxy)-3- methylbutanoic acid. (2S,3S)-amino acid isomer: 1H NMR (Methanol-d4, δ = 3.29 ppm, 400 MHz)5 3.76 (dd, J = 10.5, 5.2, IH), 3.73 (d, J = 3.0, IH), 3.67 (dd, J = 10.5, 7.0, IH), 2.37 (m, IH)5 0.97 (d, J = 7.0, 3H), 0.92 (s, 9H), 0.10 (s, 6H). LC/MS: Anal. Calcd. for [M-KH]+ C11H26NO3Si: 248.17; found 248.44. (2S,3R)~amino acid isomer: ^H NMR (Methanol^, δ = 3.29 ppm, 400 MHz), 3.76-3.75 (m, 2H), 3.60 (d, J - 4.15 IH), 2.16 (m5 IH), 1.06 (<_, ./ = 7.3, 3H)5 0.91 (s, 9H), 0.09 (s, 6H). Anal. Calcd. for [M+H]+ C1 5H26NO3Si: 248.17; found 248.44.
Water (1 mL) and NaOH (0.18 mL of 1.0 M/H2O, 0.18 mmol) were added to a mixture of (2S,3S)-2-amino-4-(tert-butyIdimethylsilyloxy)-3-methylbutanoic acid (41.9 mg, 0.169 mmol) and Na2CO3 (11.9 mg5 0.112 mmol), and sonicated for about
1 min to effect dissolution of reactants. The mixture was then cooled with an ice- water bath, methyl chloroformate (0.02 mL, 0.259 mmol) was added over 30 S5 and vigorous stirring was continued at similar temperature for 40 min and then at ambient temperature for 2.7 hr. The reaction mixture was diluted with water (5 mL), cooled with ice-water bath and treated drop-wise with 1.0 N HCl aqueous solution (-0.23 HiL). The mixture was further diluted with water (10 mL) and extracted with CH2Cl2 (15 mL, 2x). The combined organic phase was dried (MgSO^, filtered, and concentrated in vacuo to afford Cap-80a as an off-white solid. (2S,3R)-2-ammo-4- (ferf-butyldimethylsilyloxy)-3-methylbutanoic acid was similarly elaborated to Cap- 80b. Cap~80a: *H NMR (DMSOd6, δ = 2.5 ppm, 400 MHz), 12.57 (br s, IH)5 7.64 (d, J - 8.3, 0.3H), 7.19 (d, J = 8.8, 0.7H), 4.44 (M, J = 8.1, 4.6, 03H)5 4.23 (M, J = 8.7, 4.4, 0.7H), 3.56/3.53 (two singlets, 3H), 3.48-3.40 (m, 2H), 2.22-2.10 (m, IH), 0.85 (s, 9H), -0.84 (d, 0.9H, overlapped with t-Bu signal), 0.79 (d, J = 7, 2. IH), 0.02/0.01/0.00 (three overlapping singlets, 6H). LC/MS: Anal. Calcd. for [M+Na]+ C13H27NNaO5Si: 328.16; found 328.46. Cap-80b: 1H NMR (CDCl3, δ - 7.24 ppm, 400 MHz), 6.00 (br d, J - 6.8, IH), 4.36 (dd, J = 7.1, 3.1, IH), 3.87 (dd, J = 10.5, 3.0} IH), 3.67 (s, 3H), 3.58 (M, J = 10.6, 4.8, IH), 2.35 (m, IH), 1.03 (d, J - 7.1 , 3H), 0.90 (s, 9H), 0.08 (s, 6H). LC/MS: Anal. Calcd. for [M+Na]+ C13H27NNaO5Si: 328.16; found 328.53. The crude products were utilized without further purification.
Cap-81
Figure imgf000132_0001
Prepared according to the protocol described by FaIb et al, Synthetic Comm., 23:2839 (1993).
Cap-82 to Cap-85
Cap-82 to Cap-85 were synthesized from appropriate starting materials according to the procedure described for Cap-51 or Cap-13. The samples exhibited similar spectral profiles as that of their enantiomers (i.e., Cap-4, Cap-13, Cap-51 and Cap-52, respectively).
Figure imgf000133_0001
Cap-82 Cap-83 Cap-84 Cap-85
Cap-86
Figure imgf000133_0002
To a mixture of O-methyl~L-threonine (3.0 g, 22.55 mmol), NaOH (0.902 g,
22.55 mmol) in H2O (15 mL) was added ClCO2Me (1.74 mL, 22.55 mmol) dropwise at 00C. The mixture was allowed to stir for 12 h and acidified to pH 1 using IN HCl. The aqueous phase was extracted with EtOAc and (2x250 mL) and 10% MeOH in CH2Cl2 (250 mL) and the combined organic phases were concentrated under in vacuo to afford a colorless oil (4.18 g? 97%) which was of sufficient purity for use in subsequent steps. 1H NMR (400 MHz, CDCl3) δ 4.19 (s, IH), 3.92-3.97 (m, IH)5 3.66 (s, 3H), 1.17 (d, J = 7.7 Hz, 3H). LCMS: Anal. Calcd. for C7H13NO5: 191; found: 190 (M-H)".
Cap-87
Figure imgf000133_0003
To a mixture of L-homoserine (2.0 g, 9.79 rnmol), Na2CO3 (2.08 g, 19.59 mmol) in H2O (15 mL) was added ClCO2Me (0.76 mL, 9.79 mmol) dropwise at 00C.
The mixture was allowed to stir for 48 h and acidified to pH 1 using IN HCl. The aqueous phase was extracted with EtOAc and (2X250 mL) and the combined organic phases were concentrated under in vacuo to afford a colorless solid (0.719 g, 28%) which was of sufficient purity for use in subsequent steps. 1H NMR (400 MHz, CDCl3) δ 4.23. (dd, J = 4.5, 9.1 Hz, IH), 3.66 (s, 3H), 3.43-3.49 (m, 2H), 2.08 - 2.14 (m, IH), 1.82 - 1.89 (m, IH). LCMS: Anal. Calcd. for C7H13NO5: 191; found: 192 (M+H)+.
Cap-88
Figure imgf000134_0001
A mixture of L-valine (1.0 g, 8.54 mrnol), 3-bromoρyridine (1.8 mL, 18.7 mmol), K2CO3 (2.45 g, 17.7 iranol) and CuI (169 mg, 0.887 mmol) in DMSO (10 mL) was heated at 1000C for 12h. The reaction mixture was cooled to rt, poured into H2O (ca. 150 mL) and washed with EtOAc (x2). The organic layers were extracted with a small amount of H2O and the combined aq phases were acidified to ca. pH 2 with 6N HCl. The volume was reduced to about one-third and 20 g of cation exchange resin (Strata) was added. The slurry was allowed to stand for 20 min and loaded onto a pad of cation exchange resin (Strata) (ca. 25 g). The pad was washed with H2O (200 mL), MeOH (200 mL), and then NH3 (3M in MeOH5 2X200 mL). The appropriate fractions was concentrated in vacuo and the residue (ca. 1.1 g) was dissolved in H2O, frozen and lyophyllized. The title compound was obtained as a foam (1.02 g, 62%). 1H NMR (400 MHz, DMSO-d6) δ 8.00 (s, br5 IH), 7.68 - 7.71 (m, IH), 7.01 (s, br, IH)5 6.88 (d, J - 7.5 Hz, IH), 5.75 (s, br, IH), 3.54 (s, IH), 2.04 - 2.06 (m, IH), 0.95 (d, J = 6.0 Hz, 3H), 0.91 (d, J = 6.6 Hz, 3H). LCMS: Anal. Calcd. for C10H14N2O2: 194; found: 195 (M+H)+.
Cap-89
Figure imgf000134_0002
A mixture of L- valine (LO g, 8.54 mmol), 5-bromopyrimidine (4.03 g, 17.0 mmol), K2CO3 (2.40 g, 17.4 mmol) and CuI (179 mg, 0.94 mmol) in DMSO (10 mL) was heated at 1000C for 12h. The reaction mixture was cooled to RT, poured into H2O (ca. 150 mL) and washed with EtOAc (x2). The organic layers were extracted with a small amount OfH2O and the combined aq phases were acidified to ca. pH 2 with 6N HCl. The volume was reduced to about one- third and 20 g of cation exchange resin (Strata) was added. The slurry was allowed to stand for 20 min and loaded onto a pad of cation exchange resin (Strata) (ca. 25 g). The pad was washed with H2O (200 mL), MeOH (200 mL), and then NH3 (3M in MeOH, 2x200 mL). The appropriate fractions was concentrated in vacuo and the residue (ca. 1.1 g) was dissolved in H2O, frozen and lyophyllized. The title compound was obtained as a foam (1.02 g, 62%). 1H NMR (400 MHz, CD3OD) showed the mixture to contain valine and the purity could not be estimated. The material was used as is in subsequent reactions. LCMS: Anal. Calcd. for CgH]3N3O2: 195; found: 196 (M+H)+.
Cap-90
Figure imgf000135_0001
Cap-90 was prepared according to the method described for the preparation of Cap-1. The crude material was used as is in subsequent steps. LCMS: Anal Calcd. for CnH15NO2:. 193; found: 192 (M-H)".
Cap-91 to Cap-116
The following caps were prepared according to the method used for preparation of Cap-51 unless noted otherwise:
Figure imgf000136_0001
Figure imgf000137_0001
Figure imgf000138_0001
Cap Structure Analytical Data
Cap- 108 LCMS: Anal. Calcd. IOr C15H17N3O4: 303; found: 304 (M+H)+.
Cap- 109 LCMS: Anal. Calcd. for C10H12N2O4: 224; found: 225 (M+H)+.
Cap-110 LCMS: Anal. Calcd. for Ci0H12N2O4: 224; found: 225 (M+H)+.
Figure imgf000139_0001
Cap-I l l O LCMS: Anal. Calcd. for C12H16NO8P:
1 \r "NH 333; found: 334 (M+H)+.
Figure imgf000139_0002
Cap-112 O LCMS: Anal. Calcd. for C13H14N2O4: TT ^ NH 262; found: 263 (M+H)+.
Figure imgf000139_0003
Figure imgf000140_0001
Cap-117 to Cap~123
For the preparation of Cap-117 to Cap- 123 the Boc amino acids were commercially available and were deprotected by treatment with 25% TFA in CH2CI2. After complete reaction as judged by LCMS the solvents were removed in vacuo and the corresponding TFA salt of the amino acid was carbamoylated with methyl chloroformate according to the procedure for Cap-51.
Figure imgf000141_0001
Figure imgf000142_0002
Cap- 124
Preparation of (4S35R)-5-methyl-2-oxooxazolidine-4-carboxylic acid
Figure imgf000142_0001
cap-124
The hydrochloride salt of L-threonine tert-bntyl ester was carbamoylated according to the procedure for Cap-51. The crude reaction mixture was acidified with IN HCl to pH~l and the mixture was extracted with EtOAc (2X50 mL). The combined organic phases were concentrated in vacuo to give a colorless oil which solidified on standing. The aqueous layer was concentrated in vacuo and the resulting mixture of product and inorganic salts was triturated with EtOAc-CH2Cl2-MeOH
(1:1:0.1) and then the organic phase concentrated in vacuo to give a colorless oil which was shown by LCMS to be the desired product. Both crops were combined to give 0.52 g of a solid. 1H NMR (400 MHz, CD3OD) δ 4.60 (m, IH), 4.04 (d, J = 5.0 Hz, IH), 1.49 (d, J = 6.3 Hz5 3H). LCMS: Anal. Calcd. for C5H7NO4: 145; found: 146 (M+H)÷ Cap- 125
Preparation of (S)-2-(terf-butoxycarbonylamino)-4-(dimethylamino)butanoic acid
Figure imgf000143_0001
cap-125
To a suspension Of Pd(OH)2, (20%, 100 mg), aqueous formaldehyde (37% wt, 4 ml), acetic acid, (0,5 mL) in methanol (15 mL) was added (S)-4-amino-2~(tert- butoxycarbonylamino)butanoic acid (1 g, 4.48 mmol). The reaction was purged several times with hydrogen and was stirred overnight with an hydrogen balloon room temp. The reaction mixture was filtered through a pad of diatomaceous earth (CELITE®), and the volatile component was removed in vacuo. The resulting crude material was used as is for the next step. LC/MS: Anal Calcd. for C j 1H22N2O4: 246; found: 247 (M+H)+.
Cap- 126 Preparation of 3-methyl-7V-[(methyloxy)carbonyl]-L-histidine
Figure imgf000143_0002
cj-25 cap-126
This procedure is a modification of that used to prepare Cap-51. To a suspension of 3-methyl-L-histidine (0.80 g, 4.70 mmol) in THF (10 mL) and H2O (10 mL) at 00C was added NaHCθ3 (0.88 g, 10.5 mmol). The resulting mixture was treated with ClCO2Me (0.40 mL, 5.20 mmol) and the mixture allowed to stir at 00C. After stirring for ca. 2h LCMS showed no starting material remaining. The reaction was acidified to pH 2 with 6 N HCl.
The solvents were removed in vacuo and the residue was suspended in 20 mL of 20% MeOH in CH2CI2. The mixture was filtered and concentrated to give a light yellow foam (1.21 g,). LCMS and 1H NMR showed the material to be a 9:1 mixture of the methyl ester and the desired product. This material was taken up in THF (10 mL) and H2O (10 mL), cooled to 00C and LiOH (249.1 mg, 10.4 mmol) was added. After stirring ca. Ih LCMS showed no ester remaining. Therefore the mixture was acidified with 6N HCl and the solvents removed in vacuo. LCMS and 1H NMR confirm the absence of the ester. The title compound was obtained as its HCl salt contaminated with inorganic salts (1.91 g, >100%). The compound was used as is in subsequent steps without further purification. 1H NMR (400 MHz, CD3OD) δ 8.84,
(s, IH), 7.35 (s, IH), 4.52 (dd, J = 5.0, 9.1 Hz, IH), 3.89 (s, 3H), 3.62 (s, 3H)5 3.35 (dd, J - 4.5, 15.6 Hz, IH, partially obscured by solvent), 3.12 (dd, J = 9.0, 15.6 Hz, IH)XCMS: Anal. Calcd. for C9H13N3O4: 227.09; found: 228.09 (M+H)+.
Cap- 127
Preparation of (S)-2-(methoxycarbonylamino)-3-(l -methyl- 1 H-imidazol-4- yl)propanoic acid
Figure imgf000144_0001
cj-26 cap-127
Cap- 127 was prepared according to the method for Cap- 126 above starting from ( S)-2-amino~3 -(I -methyl- lH-imidazol-4-yl)propanoic acid (1,11 g, 6.56 mmol), NaHCO3 (1.21 g, 14.4 mmol) and ClCO2Me (0.56 mL, 7.28 mmol). The title compound was obtained as its HCl salt (1.79 g, >100%) contaminated with inorganic salts. LCMS and 1H NMR showed the presence of ca. 5% of the methyl ester. The crude mixture was used as is without further purification. 1H NMR (400 MHz, CD3OD) δ 8.90 (s, IH), 7.35 (s, IH), 4.48 (dd, J = 5.0, 8.6 Hz5 IH)5 3.89 (s, 3H), 3.62
(s, 3H)5 3.35 (m, IH), 3.08 (m, IH); LCMS: Anal Calcd. for C9H13N3O4: 227.09; found: 228 (M+H)+. Cap- 128 Preparation of (S)-2-(methoxycarbonylamino)-3-( 1 H- 1 ,2,3-triazol-4-yl)propanoic acid
Ph
Figure imgf000145_0001
cj'28
Figure imgf000145_0003
Figure imgf000145_0002
cj-29 cap-128
Step 1. Preparation of (S)-benzyl 2-(tert-butoxycarbonylamino)pent-4~ynoate (cj-27b)
Figure imgf000145_0004
cj-27b
To a solution of cj~27a (1.01 g, 4.74 mmol), DMAP (58 mg, 0.475 mniol) and IPr2NEt (1.7 rnL, 9.8 mmol) in CH2Cl2 (100 mL) at 00C was added Cbz-Cl (0.68 niL,
4.83 mmol). The solution was allowed to stir for 4 h at 00C, washed (IN KHSO4, brine), dried (Na2SO^, filtered, and concentrated in vacuo. The residue was purified by flash column chromatography (TLC 6:1 hex:EtOAc) to give the title compound (1.30 g, 91%) as a colorless oil. 1H NMR (400 MHz, CDCl3) δ 7.35 (s, 5H), 5.35 (d, br> Jr = 8.1 Hz, IH), 5.23 (d, J = 12.2 Hz, IH), 5.17 (d, 7 = 12.2 Hz, IH), 4.48 - 4.53
(m, IH), 2.68 - 2.81 (m, 2H), 2.00 (t, J = 2.5 Hz, IH), 1.44 (s, 9H). LCMS: Anal. Calcd. for C17H21NO4: 303; found: 304 (M+H)+. Step 2. Preparation of (S)-benzyl 3-(l-benzyl-lH-l,2,3-triazol-4-yl)-2-(terf~ butoxycarbonylamino)propanoate (cj-28)
Figure imgf000146_0001
cj-28
To a mixture of (S)-benzyl 2-(terf-butoxycarbonylamino)pent-4-ynoate (0.50 g, 1.65 mmol), sodium ascorbate (0.036 g, 0.18 mmoi), CuSO4-SH2O (0.022 g, 0.09 mmol) and NaN3 (0.13 g, 2.1 mmol) in DMF-H2O (5 mL, 4: 1) at rt was added BnBr
(0.24 mL, 2.02 mmol) and the mixture was warmed to 65°C . After 5h LCMS indicated low conversion. A further portion of NaN3 (100 mg) was added and heating was continued for 12h. The reaction was poured into EtOAc and H2O and shaken. The layers were separated and the aqueous layer extracted 3x with EtOAc and the combined organic phases washed (H2O x3, brine), dried (Na2SO4), filtered, and concentrated. The residue was purified by flash (BIOTAGE®, 40+M 0-5% MeOH in CH2Cl2; TLC 3% MeOH in CH2Cl2) to afford a light yellow oil which solidified on standing (748.3 mg, 104%). The NMR was consistent with the desired product but suggests the presence of DMF. The material was used as is without further purification. 1H NMR (400 MHz, DMSO-d6) δ 7.84 (s, IH), 7.27 - 7.32 (m, 10H),
5.54 (s, 2H), 5.07 (s, 2H), 4.25 (m, IH), 3.16 (dd, J = 1.0, 5.3 Hz, IH), 3.06 (dd, J = 5.3, 14.7 Hz), 2.96 (dd, J = 9.1, 14.7 Hz, IH), 1.31 (s, 9H). LCMS: Anal. Calcd. for C24H28N4O4: 436; found; 437 (M+H)+.
Step 3. Preparation of (S)-benzyl 3-(l-benzyl-lH-l,2,3-triazol-4-yl)-2- (methoxycarbonylamino)propanoate (cj -29)
Figure imgf000147_0001
cj-29
A solution of (S)-benzyl 3-(l-benzyl~lH-l,2,3-triazol-4-yl)-2-(tert- butoxycarbonylamino)propanoate (0.52 g, 1.15 mmol) in CH2Cl2 was added TFA (4 niL). The mixture was allowed to stir at room temperature for 2h. The mixture was concentrated in vacuo to give a colorless oil which solidified on standing. This material was dissolved in THF-H2O and cooled to 00C. Solid NaHCO3 (0.25 g, 3.00 mmol) was added followed by ClCO2Me (0.25 ml, 3.25 mmol). After stirring for 1.5h the mixture was acidified to ρH~2 with 6N HCl and then poured into H2O- EtOAc. The layers were separated and the aq phase extracted 2x with EtOAc. The combined org layers were washed (H2O, brine), dried (Na2SO4), filtered, and concentrated in vacuo to give a colorless oil (505.8 mg, 111%, NMR suggested the presence of an unidentified impurity) which solidified while standing on the pump. The material was used as is without further purification. 1H NMR (400 MHz,
DMSO-d6) δ 7.87 (s, IH), 7.70 (d, J - 8.1 Hz, IH), 7.27 - 7.32 (m, 10H), 5.54 (s, 2H), 5.10 (d, J = 12.7 Hz, IH), 5.06 (d, J = 12.7 Hz, IH)9 4.32 - 4.37 (m, IH), 3.49 (s, 3H), 3.09 (dd, J - 5.6, 14.7 Hz, IH), 2.98 (dd, J - 9.6, 14.7 Hz, IH). LCMS: Anal. Calcd. for C21H22N4O4: 394; found: 395 (M+H)+.
Step 4. Preparation of (S)-2-(methoxycarbonylamino)-3~(lH- 1 ,2,3-triazol-4- yl)propanoic acid (Cap- 128)
Figure imgf000147_0002
Cap-128 (S)-Benzyl 3-(l-benzyl-l H-1 ,2,3-triazoI-4-yI)-2-
(methoxycarbonylamino)propanoate (502 mg, 1.11 mmol) was hydrogenated in the presence of Pd-C (82 mg) in MeOH (5 mL) at atmospheric pressure for 12h. The mixture was filtered through, diatomaceous earth (CELϊTE®) and concentrated in vacuo. (S)"2-(methoxycarbonylamino)-3-(lH-l,2,3-triazol-4-yl)propanoic acid was obtained as a colorless gum (266 mg, 111%) which was contaminated with ca. 10% of the methyl ester. The material was used as is without further purification. *H NMR (400 MHz, DMSOd6) δ 12.78 (s, br, IH), 7.59 (s, IH), 7.50 (d, J = 8.0 Hz, IH), 4.19 - 4.24 (m, IH), 3.49 (s, 3H), 3.12 (dd, / = 4.8 Hz, 14.9 Hz1 IH), 2.96 (dd, J - 9.9, 15.0 Hz, IH). LCMS: Anal Calcd. for C7H10N4O4: 214; found: 215 (M+H)+.
Cap- 129 Preparation of (S)-2-(rnethoxycarbonylamino)-3-(lH-pyrazol-l-yl)propanoic acid
Figure imgf000148_0001
Step 1. Preparation of (S)-2-(benzyloxycarbonylamino)-3-(lH-pyrazol-l~ yl)propanoic acid (cj-31)
Figure imgf000148_0002
cj-31
A suspension of (S)-benzyl 2-oxooxetan-3-ylcarbamate (0.67 g, 3.03 mmol), and pyrazole (0.22 g, 3.29 mmol) in CH3CN (12 mL) was heated at 500C for 24h.
The mixture was cooled to rt overnight and the solid filtered to afford (S)~2- (benzyloxycarbonyIamino)-3-(lH-pyrazol-l-yl)propanoic acid (330.1 mg). The filtrate was concentrated in vacuo and then triturated with a small amount of CH3CN (ca. 4 mL) to afford a second crop (43.5 mg). Total yield 370.4 mg (44%). m.p. 165.5 - 1680C. lit m.p. 168.5 - 169.5 [Vederas et al., J. Am. Chem. Soc, 107:7105 (1985)]. 1H NMR (400 MHz, CD3OD) δ 7.51 (d, J - 2.0, IH), 7.48 (s, J = 1.5 Hz,
IH), 7.24 - 7.34 (m, 5H)3 6.23 m, IH), 5.05 (d, 12.7 H, IH), 5.03 (d, J = 12.7 Hz, IH), 4.59 - 4.66 (m, 2H), 4.42 - 4.49 (m, IH). LCMS: Anal. Calcd. for C14H15N3O4: 289; found: 290 (M+H)+.
Step 2. Preparation of (S )-2- (methoxycarbonylamino)-3 -( 1 H-pyrazol- 1 -yl)propanoic acid (Cap- 129)
Figure imgf000149_0001
cap-129
(S)-2-(Benzyloxycarbonylamino)-3-(l H-pyrazol- l-yl)propanoic acid (0.20 g, 0.70 mmol) was hydrogenated in the presence of Pd-C (45 mg) in MeOH (5 mL) at atmospheric pressure for 2h. The product appeared to be insoluble in MeOH, therefore the reaction mixture was diluted with 5 mL H2O and a few drops of 6N HCl.
The homogeneous solution was filtered through diatomaceous earth (CELITE®), and the MeOH removed in vacuo. The remaining solution was frozen and lyophyllized to give a yellow foam (188.9 mg). This material was suspended in THF-H2O (1 :1, 10 mL) and then cooled to O0C. To the cold mixture was added NaHCθ3 (146.0 mg, 1.74 mmol) carefully (evolution of CO2). After gas evolution had ceased (ca. 15 min) ClCO2Me (0.06 mL, 0.78 mmol) was added dropwise. The mixture was allowed to stir for 2h and was acidified to pH~2 with 6N HCl and poured into EtOAc. The layers were separated and the aqueous phase extracted with EtOAC (x5). The combined organic layers were washed (brine), dried (Na2SO4), filtered, and concentrated to give the title compound as a colorless solid (117.8 mg, 79%). 1H NMR (400 MHz, DMS0-d6) δ 13.04 (s, IH), 7.63 (d, J - 2.6 Hz, IH)5 7.48 (d, J =
8.1 Hz, IH), 7.44 (d, J - 1.5 Hz, IH), 6.19 (app t} J = 2.0 Hz, IH), 4.47 (dd, J = 3.0, 12.9 Hz, IH), 4.29 - 4.41 (m, 2H), 3.48 (s, 3H). LCMS: Anal. Calcd. for C8HnN3O4: 213; found: 214 (M+H)+. Cap- 130 N- Acetyl-(R) -phenylglycine
Figure imgf000150_0001
AcHN CO2H cap-130
Cap-130 was prepared by acylation of commercially available (R)- phenylglycine analogous to the procedure given in: Calmes, M. et al, Tetrahedron, 43(10):2285 (1987).
Caρ-131
Figure imgf000150_0002
Step a. Dimethylcarbamoyl chloride (0.92 mL, 10 mmol) was added slowly to a solution of (S)-benzyl 2-amino-3-methylbutanoate hydrochloride (2.44 g; 10 mmol) and Hunig's base (3.67 mL, 21 mmol) in THF (50 mL). The resulting white suspension was stirred at room temperature overnight (16 hours) and concentrated under reduced pressure. The residue was partitioned between ethyl acetate and water. The organic layer was washed with brine, dried (MgSO^5 filtered, and concentrated under reduced pressure. The resulting yellow oil was purified by flash chromatography, eluting with ethyl acetate:hexanes (1:1). Collected fractions were concentrated under vacuum providing 2.35 g (85%) of clear oil. 1H NMR (300 MHz, DMSO-d6) δ ppm 0.84 (d, J=6.95 Hz, 3H) 0.89 (d, J=6.59 Hz, 3H) 1.98-2.15 (m, IH) 2.80 (s, 6H) 5,01-5.09 (m, J=12.44 Hz, IH) 5.13 (d, J=12.44 Hz, IH) 6.22 (d, J=8.05 Hz, IH) 7.26-7.42 (m, 5H). LC (Cond. 1): RT = 1.76 mm; MS: Anal. Calcd. for [M+H]+ C16H22N2O3: 279.17; found 279.03.
Step b. To a MeOH (50 mL) solution of the intermediate prepared above (2.35 g; 8.45 mmol) was added Pd/C (10%;200 mg) and the resulting black suspension was flushed with N2 (3x) and placed under 1 atm of H2. The mixture was stirred at room temperature overnight and filtered though a microfiber filter to remove the catalyst. The resulting clear solution was then concentrated under reduced pressure to obtain 1.43 g (89%) of Cap-131 as a white foam, which was used without further purification. ] H NMR (500 MHz, DMSO-d6) δ ppm 0.87 (d, J-4.27 Hz, 3H)
0.88 (d, J=3.97 Hz, 3H) 1.93-2.11 (m, IH) 2.80 (s, 6H) 3.90 (dd, J=8.39, 6.87 Hz, IH) 5.93 (d, J=8.54 Hz, IH) 12.36 (s, IH).). LC (Cond. 1): RT - 0.33 min; MS: Anal. Calcd. for [M+H]+ C8H17N2O3: 1898.12; found 189.04.
Cap-132
Figure imgf000151_0001
Cap-132 was prepared from (S)-benzyl 2-aminopropanoate hydrochloride according to the method described for Cap-131. 1H NMR (500 MHz, DMSO-d6) δ ppm 1.27 (d, J-7.32 Hz, 3H) 2.80 (s, 6H) 4.06 (qt, IH) 6.36 (d, J=7.32 Hz, IH) 12.27 (s, IH). LC (Cond. 1): RT - 0.15 min; MS: Anal. Calcd. for [M+H]+ C6H13N2O3: 161.09; found 161.00.
Cap-133
Figure imgf000151_0002
Cap-133 was prepared from (S)-tert-butyl 2-amino-3-methylbutanoate hydrochloride and 2-fluoroethyl chloroformate according to the method described for Cap-47. 1H NMR (500 MHz, DMSO-d6) δ ppm 0.87 (t, J = 6.71 Hz, 6H) 1.97-2.10 (m, IH) 3.83 (dd, 7=8.39, 5.95 Hz, IH) 4.14-4.18 (m, IH) 4.20-4.25 (m, IH) 4.50- 4.54 (m, IH) 4.59-4.65 (m, IH) 7.51 (d, J = 8.54 Hz, IH) 12.54 (s, IH). Cap- 134
Figure imgf000152_0001
Cap- 134 was prepared from (S)-diethyl alanine and methyl chloroformate according to the method described for Cap-5 L 1H NMR (500 MHz, DMSO-d6) δ ppm 0.72-0.89 (m, 6H) 1.15-1.38 (m, 4H) 1.54-1.66 (m, IH) 3.46-3.63 (m, 3H) 4.09 (dd, J - 8.85, 5.19 Hz, IH) 7.24 (d, J = 8.85 Hz, IH) 12.55 (s, IH). LC (Cond. 2): RT = 0.66 min; LC/MS: Anal. Calcd. for [M+H]+ C9H18NO4: 204.12; found 204.02.
Cap- 135
Figure imgf000152_0002
A solution of D-2-ammo-(4-fiuorophenyl)acetic acid (338 mg, 2.00 mmol), IiVHCl in ether (2.0 niL, 2.0 mmol) and formalin (37%, 1 mL) in methanol (5 mL) was subjected to balloon hydrogenation over 10% palladium on carbon (60 mg) for 16 h at 25 0C. The mixture was then filtered through CELITE® to afford Cap-135 as a white foam (316 mg, 80%). 1H NMR (300 MHz, MeOH-d4) δ 7.59 (dd, J= 8.80, 5.10 Hz5 2H), 7.29 (t, J= 8.6 Hz, 2H), 5.17 (s, IH), 3.05 (v br s, 3H), 2.63 (v br s, 3H); Rt = 0.19 min (Cond. MS-W5); 95% homogenity index; LRMS: Anal. CaIc. for
[M+H]+ C10H13FNO2: 198.09; found: 198.10.
Cap- 136
Figure imgf000152_0003
To a cold (-500C) suspension of 1 -benzyl- liϊ-imidazole (1,58 g, 10.0 mmol) in anhydrous diethyl ether (50 mL) under nitrogen was added n-butyl lithium (2.5 M in hexanes, 4.0 mL, 10.0 mmol) dropwise. After being stirred for 20 min at -50 °C, dry carbon dioxide (passed through Drierite) was bubbled into the reaction mixture for 10 min before it was allowed to warm up to 25 0C. The heavy precipitate which formed on addition of carbon dioxide to the reaction mixture was filtered to yield a hygroscopic, white solid which was taken up in water (7 mL), acidified to pH = 3, cooled, and induced to crystallize with scratching. Filtration of the precipitate gave a white solid which was suspended in methanol, treated with IN HCl/diethyl ether (4 mL) and concentrated in vacuo. Lyophilization of the residue from water (5 mL) afforded Cap- 136 as a white solid (817 mg, 40%). 1H NMR (300 MHz, DMSOd6) δ 7.94 (d, J= 1.5 Hz, IH), 7.71 (d, J= 1.5 Hz, IH), 7.50-7.31 (m, 5H), 5.77 (s, 2H); Rt
= 0.51 min (Cond. MS-WS); 95% homogenity index; LRMS: Anal CaIc. for [M+H]+ C1 1H12N2O2: 203.08; found: 203.11.
Cap- 137
Figure imgf000153_0001
Cap- 137, step a
Figure imgf000153_0002
A suspension of 1 -chloro-3-cyanoisoquinoHne (prepared according to the procedure in WO 2003/099274) (18S mg, 1.00 mmol), cesium fluoride (303.8 mg, 2.00 mmol), bis(tri-tert-butylphosphine)palladium dichloride (10 mg, 0.02 mmol) and 2-(tributylstannyl)furan (378 μL, 1.20 mmol) in anhydrous dioxane (10 mL) under nitrogen was heated at 80 0C for 16 h before it was cooled to 25 0C and treated with saturated, aqueous potassium fluoride solution with vigorous stirring for 1 h. The mixture was partitioned between ethyl acetate and water and the organic phase was separated, washed with brine, dried with Na2SO4, filtered and concentrated.
Purification of the residue on silica gel eluting with 0% to 30% ethyl acetate/hexanes afforded Cap- 137, step a as a white solid which was used as is (230 mg, 105%). Rt =
1.95 min (Cond. MS-W2); 90% homogeneity index; LRMS: Anal. CaIc. for [M+H]+ C14H8N2O: 221.07; found: 221.12.
Figure imgf000154_0001
To a suspension of Cap-137, step a, (1 10 mg, 0.50 mrnol) and sodium periodate (438 mg, 2.05 mmol) in carbon tetrachloride (1 mL), acetonitrile (1 mL) and water (1.5 mL) was added ruthenium trichloride hydrate (2 mg, 0.011 mmol) in one portion. The mixture was stirred at 25 0C for 2 h and then partitioned between dichloromethane and water. The aqueous layer was separated, extracted twice more with dichloromethane and the combined dichloromethane extracts were dried with Na2SO4^ filtered and concentrated. Trituration of the residue with hexanes afforded
Caρ-137 (55 mg, 55%) as a grayish-colored solid. R1 = 1.10 min {Cond, MS-W2); 90% homogeneity index; LCMS: Anal. CaIc. for [M+H]+ C1 1H8N2O2: 200.08; found: 200.08. .
Cap-138toCap-158
Synthetic Strategy. Method A.
Figure imgf000155_0001
BMCLlQOi,
11, 1885-1888.
Figure imgf000155_0002
Figure imgf000155_0003
Cap- 138, step a
Figure imgf000155_0004
To a stirred suspension of 5-hydroxisoquinoline (prepared according to the procedure in WO 2003/099274) (2.0 g, 13.8 mmol) and triphenylphosphine (4.3 g, 16.5 mmol) in dry tetrahydrofuran (20 rnL) was added dry methanol (0.8 niL) and diethyl azodicarboxylate (3.0 mL, 16.50 mmol) portion wise. The mixture was stirred at room temperature for 20 h before it was diluted with ethyl acetate and washed with brine, dried with Na2SO,^ filtered and concentrated. The residue was preabsorbed onto silica gel and purified, eluting with 40% ethyl acetate/hexanes to afford Cap-138, step a as a light yellow solid (1.00 g, 45%). 1H NMR (CDCl3, 500 MHz) δ 9.19 (s, IH), 8.51 (d, J- 6.0 Hz, IH), 7.99 (d, J= 6.0 Hz, IH), 7.52-7.50 (m, 2H), 7.00-6.99 (m, IH), 4.01 (s, 3H); R1= 0.66 min (Cond. D 2); 95% homogeneity index; LCMS:
Anal. CaIc. for [M+H]+ C10H10NO: 160.08; found 160.1.
Cap- 138, step b
Figure imgf000156_0001
To a stirred solution of Cap-138, step a (2.34 g, 14.7 mmol) in anhydrous dichloromethane (50 mL) at room temperature was added metø-chloroperbenzoic acid (77%, 3.42 g, 19.8 mmol) in one portion. After being stirred for 20 h, powdered potassium carbonate (2.0 g) was added and the mixture was stirred for 1 h at room temperature before it was filtered and concentrated to afford Cap-138, step b as a pale, yellow solid which was sufficiently pure to carry forward (2.15 g, 83.3%). 1H NMR (CDCl3, 400 MHz) 5 8.73 (d, J- 1.5 Hz, IH), 8.11 (dd, J = 7.3, 1.7 Hz, IH), 8.04 (d, /=7.1 Hz, IH), 7.52 (t, J= 8.1 Hz, IH)5 7.28 (d, J = 8.3 Hz, IH), 6.91 (d, /= 7.8 Hz, IH), 4.00 (s, 3H); R4= 0.92 min, (Cond. Dl); 90% homogenity index; LCMS: Anal.
CaIc. for [M+H]+ C10Hi0NO2: 176.07; found: 176.0. Cap- 138, step c
Figure imgf000157_0001
To a stirred solution of Cap-138, step b (0.70 g, 4.00 mmol) and triethylamine (1.1 inL, 8.00 mmol) in dry acetonitrile (20 mL) at room temperature under nitrogen was added trimethylsilylcyanide (1.60 mL, 12.00 mmol). The mixture was heated to 75 0C for 20 h before it was cooled to room temperature, diluted with ethyl acetate and washed with saturated sodium bicarbonate solution and brine prior to drying with Na2SC>4 and solvent concentration. The residue was flash chromatographed on silica gel eluting with 5% ethyl acetate/hexanes to 25% ethyl acetate/hexanes to afford Cap- 138, step c (498.7 mg) as a white, crystalline solid along with 223 mg of additional Cap-138, step c recovered from the filtrate; 1H NMR (CDCl3, 500 MHz) δ 8.63 (d, J = 5.5 Hz, IH), 8.26 (d, J= 5.5 Hz9 IH), 7.88 (d, J- 8.5 Hz, IH), 7.69 (t, J= 8.0 Hz, IH), 7.08 (d, J- 7.5 Hz, IH), 4.04 (s, 3H); R4= 1.75 min, iCond. Dl); 90% homogeneity index; LCMS: Anal. CaIc. for [M+H]+ C1 1H9N2O: 185.07; found; 185.10.
Figure imgf000157_0002
Cap-138, step c (0.45 g, 2.44 mmol) was treated with 5N sodium hydroxide solution (10 mL) and the resulting suspension was heated to 85 0C for 4 h, cooled to 25 0C, diluted with dichlorome thane and acidified with IiV hydrochloric acid. The organic phase was separated, washed with brine, dried, concentrated to 1A volume and filtered to afford Cap-138 as a yellow solid (0.44 g, 88.9%). 1H NMR (DMSOd6, 400 MHz) δ 13.6 (br s, IH)5 8.56 (d, J- 6.0 Hz, IH), 8.16 (d, J - 6.0 Hz, IH), 8.06 (d, J= 8.8 Hz5 IH), 7.71-7.67 (m, IH)5 7.30 (d, J- 8.0 Hz, IH), 4.02 (s, 3H); R4 =
0.70 min (Con d. Dl); 95% homogenity index; LCMS: Anal. CaIc. for [M+H]+ C1 1H10NO3: 204.07; found: 204.05.
Synthetic Strategy. Method B (derived from Tetrahedron Letters, 42:6707 (2001)).
Figure imgf000158_0001
WO 2003/ 099274
Figure imgf000158_0002
Cap- 139
Figure imgf000158_0003
Cap- 139, step a
Figure imgf000158_0004
To a thick- walled, screw-top vial containing an argon-degassed suspension of l-chloro-6-methoxyisoquinolme (prepared according to the procedure in WO 2003/099274) (1.2 g, 6.2 mmol), potassium cyanide (0.40 g, 6.2 mmol), 1.5- bis(diphenylphosphino)pentane (0.27 g, 0.62 mmol) and palladium (II) acetate (70 mg, 0.31 mmol) in anhydrous toluene (6 mL) was added N,N,N',N'- tetramethylethylenediamine (0.29 mL, 2.48 mmol). The test tube was sealed and heated to 150 0C for 22 h, and then allowed to cool to 25 0C. The reaction was diluted with ethyl acetate, washed with water and brine, dried with N^SOφ filtered and concentrated. The residue was purified on silica gel eluting with 5% ethyl acetate/hexanes to 25% ethyl acetate/hexanes to afford Cap-139, step a as a white solid (669.7 mg). 1H NMR (CDCl3, 500 MHz) δ 8.54 (d, J- 6.0 Hz5 IH), 8.22 (d, J - 9.0 Hz5 IH)9 7.76 (d, J= 5.5 Hz5 IH)5 7.41-7.39 (m, IH), 7.13 (d, J= 2.0 Hz, IH), 3.98 (s, 3H); R1 = 1.66 min (Cond. Dl); 90% homogenity index; LCMS: Anal. CaIc. for [MH-H]+ C1 1H9N2O: 185.07; found: 185.2.
Figure imgf000159_0001
Cap-139 was prepared from the basic hydrolysis of Cap-1395 step a with 57V NaOH according to the procedure described for Cap- 138. 1H NMR (400 MHz, DMSO-d6) δ 13.63 (v br s, IH)5 8.60 (d, J= 9.3 Hz, IH), 8.45 (d, J= 5.6 Hz, IH), 7.95 (d, J= 5.9 Hz, IH), 7.49 (d, J= 2.2 Hz, IH), 7.44 (dd, J- 9.3, 2.5 Hz, IH)5 3.95 (s, 3H); Rt - 0.64 min {Cond. Dl); 90% homogenity index; LCMS: Anal. CaIc. for
[M-HH]+ C11H10NO3: 204.07; found: 204.05.
Figure imgf000159_0002
Cap- 140, step a
Figure imgf000160_0001
To a vigorously-stirred mixture of l,3-dichloiO-5-ethoxyisoquinoline (prepared according to the procedure in WO 2005/051410) (482 mg, 2.00 mmol), palladium (H) acetate (9 mg, 0.04 mmol), sodium carbonate (223 mg, 2.10 mmol) and l>5-bis(diphenylphosphino)pentane (35 mg, 0.08 mmol) in dry dimethylacetamide (2 mL) at 25 0C under nitrogen was added N,N,N',N'-tetramethylethyϊenediamme (60 niL, 0.40 mmol). After 10 min, the mixture was heated to 150 0C. A stock solution of acetone cyanohydrin (prepared from 457 fxL of acetone cyanohydrin in 4.34 mL DMA) was added in 1 mL portions over 18 h using a syringe pump. The mixture was then partitioned between ethyl acetate and water and the organic layer was separated, washed with brine, dried with Na2SO^,, filtered and concentrated. The residue was purified on silica gel eluting with 10% ethyl acetate/hexanes to 40% ethyl acetate/hexanes to afford Cap-101, step a as a yellow solid (160 mg, 34%). Rt = 2.46 min (Cond. MS-W2)\ 90% homogenity index; LCMS: Anal. CaIc. for [M+H]+ C12H9ClN2O: 233.05; found: 233.08.
Figure imgf000160_0002
Cap-140 was prepared by the acid hydrolysis of Cap-140, step a with 127VHC1 as described in the procedure for the preparation of Caρ-141. Rt = 2.24 min {Cond.
MS-W2); 90% homogenity index; LCMS: Anal. CaIc. for [M+H]+ C12H11ClNO3: 252.04; found; 252.02. Cap-141
Figure imgf000161_0001
Cap- 141 , step a
Figure imgf000161_0002
Cap-141, step a was prepared from l-bromo-3-fluoroisoquinoline (prepared from 3-amino-l-bromoisoquinoline using the procedure outlined in J, Med, Chem., 13:613 (1970)) as described in the procedure for the preparation of Cap-140, step a vide infra. *H NMR (500 MHz, CDCl3) 6 8.35 (d, J- 8.5 Hz, IH), 7.93 (d, J- 8.5 Hz, IH), 7.83 (t, J= 7.63 Hz5 IH), 7.77-7.73 (m, IH), 7.55 (s, IH); Rt = 1.60 min (CW. Dl); 90% homogenity index; LCMS: Anal. CaIc. for [M+H]+ C10H6FN2: 173.05; found: 172.99.
Cap-141
Figure imgf000161_0003
Cap-141, step a (83 mg, 0.48 mmol) was treated with 12N HCl (3 raL) and the resulting slurry was heated to 80 0C for 16 h before it was cooled to room temperature and diluted with water (3 rnL). The mixture was stirred for 10 min., and then filtered to afford Cap-141 as an off-white solid (44.1 mg, 47.8%). The filtrate was diluted with dichloromethane and washed with brine, dried and concentrated to afford additional Cap-141 which was sufficiently pure to be carried forward directly (29.30 mg, 31.8%). 1H NMR (DMSOd6, 500 MHz) δ 14.0 (br S5 IH), 8.59-8.57 (m, IH), 8.10 (ά, J= 8.5 Hz5 IH)5 7.88-7.85 (m, 2H), 7.74-7.71 (m, IH); R4 = 1.33 min (Cond. Dl); 90% homogenity index; LCMS: Anal. CaIc. for [M+H]+ C10H7FNO2: 192.05; found: 191.97.
Figure imgf000162_0001
Cap- 142, step a
Figure imgf000162_0002
Cap- 142 step a was prepared from 4-bromoisoquinoline N-oxide as described in the two-step procedure for the preparation of Cap-138 steps b and c. Rt = 1 ,45 min
(CW. MS-Wl); 90% homogenity index; LCMS: Anal. CaIc. for [M+H]+ C10H6BrN2: 232.97; found: 233.00.
Cap- 142, step b
Figure imgf000162_0003
To an argon-degassed suspension of Cap-142, step a (116 mg, 0.50 mmol), potassium phosphate tribasic (170 mg, 0.80 mmol), palladium (II) acetate (3.4 mg, 0.015 mmol) and 2-(dicyclohexylphosphino)biphenyl (11 mg, 0.03 mraol) in anhydrous toluene (1 mL) was added morpholine (61 μL, 0.70 mmol). The mixture was heated to 100 0C for 16 h> cooled to 25 0C and filtered through diatomaceous earth (CELΪTE®). Purification of the residue on silica gel, eluting with 10% to 70% ethyl acetate/hexanes afforded Cap- 142, step b (38 mg, 32%) as a yellow solid, which was carried forward directly. Rt - 1.26 rm'n (Cond. MS-Wl); 90% homogenity index;
LCMS: Anal. CaIc. for [M+H]+ Cj4H14N3O: 240.11; found: 240.13.
Figure imgf000163_0001
Cap- 142 was prepared from Cap- 142, step b with 57V sodium hydroxide as described in the procedure for Cap-138. Rt = 0.72 mm {Cond. MS-Wl); 90% homogenity index; LCMS: Anal. CaIc. for (M+H]+ C14H15N2O3: 259.11; found: 259.08.
Cap- 143
Figure imgf000163_0002
Cap- 143, step a
Figure imgf000164_0001
To a stirred solution of 3-amino-l-bromoisoquinolirie (444 mg, 2,00 mmol) in anhydrous dimethylformamide (10 mL) was added sodium hydride (60%, unwashed, 96 mg, 2.4 mmol) in one portion. The mixture was stirred at 25 0C for 5 min before 2-bromoethyl ether (90%, 250 μL, 2.00 mmol) was added. The mixture was stirred at 25 0C for 5 h and at 75 0C for 72 h before it was cooled to 25 0C, quenched with saturated ammonium chloride solution and diluted with ethyl acetate. The organic layer was separated, washed with water and brine, dried with Na2SC>4, filtered and concentrated. Purification of the residue on silica gel eluting with 0% to 70% ethyl acetate/hexanes afforded Cap-143, step a as a yellow solid (180 mg, 31%). Rt = 1.75 min (Cond. MS-Wl); 90% homogenity index; LCMS: Anal. CaIc. for [M+H]+ C13H14BrN2O: 293.03; found: 293.04.
Cap-143
Figure imgf000164_0002
To a cold (-60 0C) solution of Cap-143? step a (154 mg, 0.527 mmol) in anhydrous tetrahydrofuran (5 mL) was added a solution of n -butyl lithium in hexanes (2.5 M, 0.25 mL, 0.633 mmol). After 10 min, dry carbon dioxide was bubbled into the reaction mixture for 10 min before it was quenched with IiV HCl and allowed to warm to 25 0C. The mixture was then extracted with dichloromethane (3 x 30 mL) and the combined organic extracts were concentrated in vacuo. The residue was purified by a reverse phase HPLC (MeOH/water/TFA) to afford Cap-143 (16 mg, 12%). Rt - 1.10 min (Cond MS-W1)\ 90% homogenity index; LCMS: Anal. CaIc. for [M+H]÷ C14H15N2O3: 259.11; found: 259.08.
Cap- 144
Figure imgf000165_0001
Cap- 144, step a
Figure imgf000165_0002
1,3-Dichloroisoquinoline (2.75 g, 13.89 mmol) was added in small portions to a cold (0 0C) solution of fuming nitric acid (10 mL) and concentrated sulfuric acid (10 mL). The mixture was allowed to stir at 0 0C for 0.5h before it was gradually warmed to 25 0C where it stirred for 16 h. The mixture was then poured into a beaker containing chopped ice and water and the resulting suspension was stirred for Ih at 0 0C before it was filtered to afford Cap- 144, step a (2.73 g, 81%) as a yellow solid which was used as is. Rt - 2.01 min. {Cond. DJ); 95% homogenity index; LCMS:
Anal. CaIc. for [M+H]+ C9H5Cl2N2O2: 242.97; found: 242.92.
Figure imgf000165_0003
Cap-144, step a (030 g, 1.23 mmol) was taken up in methanol (60 mL) and treated with platinum oxide (30 mg). The suspension was subjected to Parr hydrogenation (7 psi H2) for 1.5 h before formalin (5 mL) and additional platinum oxide (30 mg) were added. The suspension was resubjected to Parr hydrogenation at 45 psi H2 for 13 h before it was suction- filtered through diatomaceous earth
(CELITE®) and concentrated down to 1A volume. Suction-filtration of the ensuing precipitate afforded the title compound as a yellow solid which was flash chromatographed on silica gel eluting with 5% ethyl acetate in hexanes to 25% ethyl acetate in hexanes to afford Cap-144, step b (231 mg, 78%) as a pale yellow solid, Rt = 2.36 min (Cond. Dl); 95% homogenity index; 1H NMR (400 MHz5 CDCl3) 8.02 (s, IH), 7.95 (d, J- 8.6 Hz5 IH)5 7.57-7.53 (m, IH), 7.30 (d, J- 7.3 Hz, IH), 2.88 (s, 6H); LCMS: Anal. CaIc. for [M+H]+ C11H11Cl2N2: 241.03; found: 241.02. HRMS: Anal. CaIc. for [M+H]+ C11H11Cl2N2: 241.0299; found: 241.0296.
Cap-1445 step c
Figure imgf000166_0001
Cap-144, step c was prepared from Cap-144, step b according to the procedure described for the preparation of Cap- 139, step a. Rt= 2.19 min. (Cond. Dl); 95% homogenity index; LCMS: Anal. CaIc. for [M+H]+ C12H11ClN3: 232.06; found: 232.03. HRMS: Anal. CaIc. for [M+H]+ C12H11ClN3: 232.0642; found: 232.0631. Cap- 144
Figure imgf000167_0001
Cap- 144 was prepared according to the procedure described for Cap- 141. Rt=2.36 min (Cond. Dl); 90%; LCMS: Anal. CaIc. for [M+H]+ C12H12ClN2O2: 238.01 ; found: 238.09.
Cap- 145 to Cap- 162
Cap- 145 to Cap- 162 were prepared from the appropriate 1 -chloroisoquinoHn.es according to the procedure described for the preparation of Cap-138 (Method A) or Cap- 139 (Method B) unless noted otherwise as outlined below.
Figure imgf000167_0002
Figure imgf000168_0001
Figure imgf000169_0001
Figure imgf000170_0001
Figure imgf000171_0001
Figure imgf000172_0001
Figure imgf000173_0001
Figure imgf000174_0002
Cap- 163
Figure imgf000174_0001
To a solution of 2-ketobutyric acid (1.0 g, 9.8 mmol) in diethylether (25 ml) was added phenylmagnesium bromide (22 ml, IM in THF) dropwise. The reaction was stirred at -25 0C under nitrogen for 17.5h. The reaction was acidified with IN HCl and the product was extracted with ethyl acetate (3 x 100 ml). The combined organic layer was washed with water followed by brine and dried over MgS O4. After concentration in vacuo, a white solid was obtained. The solid was recrystallized from hexanes/ethyl acetate to afford Cap-163 as white needles (883.5 mg). 1H NMR (DMSO-d6, δ = 2.5 ppm, 500 MHz): 12.71 (br s, 1 H), 7.54-7.52 (m, 2H), 7.34-7.31 (m, 2H), 7.26-7.23 (m, IH), 5.52-5.39 (br s, IH), 2.11 (m, IH), 1.88 (m, IH), 0.79 (app t, J = 7.4 Hz, 3H).
Figure imgf000175_0001
A mixture of 2-amino-2-phenylbutyric acid (1.5 g, 8.4 mmol), formaldehyde
(14 mL, 37% in water), IN HCl (10 mL) and 10% Pd/C (0.5 mg) in MeOH (40 mL) was exposed to H2 at 50 psi in a Parr bottle for 42 h. The reaction was filtered over CELITE® and concentrated in vacuo, the residue was taken up in MeOH (36 mL) and the product was purified with a reverse phase HPLC (MeOH/^O/TFA) to afford the TFA salt of Cap-164 as a white solid (1.7 g). 3H NMR (DMSO-d6, δ - 2.5 ppm, 500
MHz) 7.54-7.47 (m, 5H), 2.63 (m, IH), 2.55 (s, 6H), 2.31 (m, IH)5 0.95 (app t, J = 7.3 Hz, 3H).
Figure imgf000175_0002
To a mixture of 2-amino-2-indanecarboxylic acid (258.6 mg, 1.46 mmol) and formic acid (0.6 ml, 15.9 mmol) in 1,2-dichloroethane (7 ml) was added formaldehyde (0.6 ml, 37% in water). The mixture was stirred at -25 0C for 15 min then heated at 70 0C for 8h, The volatile component was removed in vacuo, and the residue was dissolved in DMF (14 mL) and purified by a reverse phase HPLC
(MeOH/H2O/TFA) to afford the TFA salt of Cap- 165 as a viscous oil (120.2 mg). 1H NMR (DMSOd6, δ = 2.5 ppm, 500 MHz): 7.29-7.21 (m, 4 H), 3.61 (d, J = 17.4 Hz,
2H), 3.50 (d, J = 17.4 Hz, 2H), 2.75 (s, 6H). LC/MS: Anal. Calcd. for [M+H]+ C12H16NO2: 206.12; found: 206.07.
Cap-166a and Cap-166b
Cap-166a: Diastereomer-1 Cap-166b: Diastereomer-2
Figure imgf000176_0001
Cap-166a and Cap-166b were prepared from (IS, 4S)-(+)-2~methyl-2,5- diazabicyclo[2.2, l]heptane (2HBr) according to the method described for the synthesis of Cap-7a and Cap-7b, with the exception that the benzyl ester intermediate was separated using a semi-prep Chrialcel OJ column, 20 x 250 mm, 10 μm eluting with 85:15 heptane/ethanol mixture at 10 mIVmin elution rate for 25 min. Cap- 166b: 1H NMR (DMSO-d6, δ - 2.5 ppm, 500 MHz): 7.45 (d, J = 7.3 Hz, 2H), 7.27-7.19 (m, 3H), 4.09 (s, IH), 3.34 (app br s, IH), 3.16 (app br s, IH), 2.83 (d, .7=10.1 Hz, IH), 2.71 (m, 2H), 2.46 (m, IH), 2.27 (s, 3H), 1.77 (d, J = 9.8 Hz5 IH)1 1.63 (d, J - 9.8 Hz, IH). LC/MS: Anal. Calcd. for [M+H]+ C14H19N2O2: 247.14; found: 247.11.
Figure imgf000176_0002
A solution of racemic Boc-l,3-dihydro-2H-isoindole carboxylic acid (1.0 g, 3.8 mmol) in 20% TFA/CH2C12 was stirred at -25 0C for 4h. All the volatile component was removed in vacuo. A mixture of the resultant crude material, formaldehyde (15 mL, 37% in water), IN HCl (10 mL) and 10% Pd/C (10 mg) in MeOH was exposed to H2 (40 PSI) in a Parr bottle for 23 h. The reaction mixture was filtered over CELITE® and concentrated in vacuo to afford Cap- 167 as a yellow foam (873.5 mg). 1H NMR (DMSO-d6, δ = 2.5 ppm, 500 MHz) 7.59-7.38 (m, 4H), 5.59 (s, IH), 4.84 (d, J = 14 Hz5 IH), 4.50 (d, J = 14.1 Hz, IH), 3.07 (s, 3H). LC/MS: Anal. Calcd. for [M+H]+ C10H12NO2: 178.09; found: 178.65.
Figure imgf000177_0001
Racemic Cap- 168 was prepared from racemic Boc-aminoindane-l-carboxylic acid according to the procedure described for the preparation of Cap-167. The crude material was employed as such.
Figure imgf000177_0002
A mixture of 2-amino-2-phenylpropanoic acid hydrochloride (5.0 g, 2.5 mmol), formaldehyde (15 ml, 37% in water), IN HCl (15 ml), and 10% Pd/C (1,32 g) in MeOH (60 mL) was placed in a Parr bottle and shaken under hydrogen (55 PSI) for 4 days, The reaction mixture was filtered over CELITE® and concentrated in vacuo, The residue was taken up in MeOH and purified by reverse phase prep-HPLC (MeOH/water/TFA) to afford the TFA salt of Cap- 169 as a viscous semi-solid (2.1 g). 1H NMR (CDCl3, δ = 7.26 ppm, 500 MHz): 7.58-7.52 (m, 2 H), 7.39-7.33 (m, 3H),
2.86 (br s, 3H), 2.47 (br s, 3H), 1.93 (s, 3H). LC/MS: Anal. Calcd. for [M+H]+ C1 1H16NO2: 194.12; found: 194.12.
Figure imgf000178_0001
To (5>2~amino-2~(tetrahydro-2/f-pyran-4-yl)acetic acid (505mg; 3.18 ramol; obtained from Astatech) in water (15 mL) was added sodium carbonate (673 mg; 6.35 mmol) and the resultant mixture was cooled to O 0C at which time methyl chlorofcrmate (0.26 mL; 3.33 mmol) was added dropwise over 5 minutes. The reaction was- allowed to stir for 18 hours slowly coming to ambient temperature as the ice bath melted. The reaction mixture was then partitioned between IN HCl and ethyl acetate. The organic layer was removed and the aqueous layer was further extracted with 2 additional portions ethyl acetate. The combined organic layers were washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuo to a colorless residue. 1H NMR (500 MHz, DMSOd6) 8 ppm 12.65 (1 H5 br. s.), 7.44 (1 H, d, J=8.24 Hz), 3.77 - 3.95 (3 H, m), 3.54 (3 H, s), 3.11 - 3.26 (2 H9 m), 1.82 - 1.95 (1 H, m), 1.41 - 1.55 (2 H, m), 1.21 - 1.39 (2 H, m); LC/MS: Anal. Calcd. for [M+H]+ C9H16NO5: 218.1; found 218.1.
Cap- 171
Figure imgf000178_0002
A solution of methyl 2-(benzyloxycarbonylamino)-2-(oxetan-3-ylidene)acetate (200 mg, 0.721 mmol; // Farmaco, 56:609-613 (2001)) in ethyl acetate (7 ml) and CH2CI2 (4.00 ml) was degassed by bubbling nitrogen for lOmin. Dimethyl dicarbonate (0.1 16 ml, 1.082 mmol) and Pd/C (20 mg, 0.019 mmol) were then added, the reaction mixture was fitted with a hydrogen balloon and allowed to stir at ambient temperature overnight at which time TLC (95:5 CH2C^MeOH: visualized with stain made from 1 g Ce(NH^SO4, 6 g ammonium molybdate, 6 mL sulfuric acid, and 100 mL water) indicated complete conversion. The reaction was filtered through CELITE® and concentrated. The residue was purified via BΪOTAGE® (load with dichlorome thane on 25 samplet; elute on 25 S column with dichloromethane for 3CV then 0 to 5% MeOH/dichloromethane over 250 mL then hold at 5%
MeOH/dichloromethane for 250 mL; 9 mL fractions). Collected fractions containing desired material and concentrated to 120 mg (81%) of methyl 2- (methoxycarbonylamino)-2-(oxetan-3-yl)acetate as a colorless oil. 1H NMR (500 MHz, CHLOROFORM-d) δ ppm 3.29 - 3.40 (m, /=6.71 Hz, 1 H) 3.70 (s, 3 H) 3.74 (s, 3 H) 4.55 (t, /=6.41 Hz, 1 H) 4.58 - 4.68 (m, 2 H) 4.67 - 4.78 (m, 2 H) 5.31 (br s, 1 H). LC/MS: Anal. Calcd. for [M+H]+ C8H14NO5: 204.2; found 204.0.
To methyl 2-(methoxycarbonylamino)-2-(oxetan-3-yl)acetate (50 mg, 0.246 mmol) in THF (2 mL) and water (0.5 mL) was added lithium hydroxide monohydrate (10.33 mg, 0,246 mmol), The resultant solution was allowed to stir overnight at ambient temperature. TLC (1 :1 EA/Hex; Hanessian stain [1 g Ce(NH4^SO4, 6 g ammonium molybdate, 6 mL sulfuric acid, and 100 mL water]) indicated -10% starting material remaining. Added an additional 3 mg LiOH and allowed to stir overnight at which time TLC showed no starting material remaining. Concentrated in vacuo and placed on high vac overnight providing 55mg lithium 2- (methoxycarbonylamino)-2~(oxetan-3-yl)acetate as a colorless solid. 1H NMR (500 MHz, MeOD) δ ppm 3.39 - 3.47 (m, 1 H) 3.67 (s, 3 H) 4.28 (d, /=7.93 Hz, 1 H) 4.64 (t, J-6.26 Hz, 1 H) 4.68 (t, J-7.02 Hz, 1 H) 4.73 (d, J=7.63 Hz, 2 H).
Cap-172
Figure imgf000179_0001
Cap-172, step a
Figure imgf000180_0001
The following diazotization step was adapted from Barton, A.; Breukelman, S. P.; Kaye, P. T.; Mealdns, G. D.; Morgan, D. J. J C. S. PeMn Trans I 1982, 159- 164: A solution OfNaNO2 (166 mg, 2,4 mmol) in water (0.6 mL) was added slowly to a stirred, cold (0 0C) solution of methyl 2-ammo-5-ethyl-l53-tb.iazole-4-carboxylate (186 mg, 1.0 mmol), CuSO4-SH2O (330 mg, 1.32 mmol), NaCl (260 mg, 4.45 mmol) and H2SO4 (5.5 mL) in water (7,5 mL). The mixture was stirred at 00C for 45 min and allowed to warm up to room temperature where it stirred further for 1 h before CuCl (118 mg) was added. This mixture was stirred further at room temperature for 16 h before it was diluted with brine and extracted with ether twice. The organic layers were combined, dried over MgSO4 and concentrated to give methyl 2-chloro-5- ethylthiazole-4-carboxylate (i.e. Cap-172, step a) (175 mg, 85%) as an orange oil (80% pure) which was used directly in the next reaction. Rt = 1.99 min (Cond.- MDl); LC/MS: Anal. Calcd. for [M+H]+ C7H9ClNO2S: 206.01; found: 206.05.
Cap-172
To a solution of methyl 2-chloro-5-ethylthiazole-4-carboxylate (175 mg) in THF/H2O/Me0H (20 mL/ 3 mL/ 12 mL) was added LiOH (305 mg, 12.76 mmol). The mixture was stirred at room temperature overnight before it was concentrated down and neutralized with IN HCl in ether (25 mL). The residue was extracted twice with ethyl acetate and the organic layers were combined, dried over MgSO4 and evaporated to yield Cap-172 (60 mg, 74%) as a red solid which was used without further purification. 1H NMR (300 MHz, DMSO-d6) δ ppm 13.03-13.42 (1 H, m), 3.16 (2 H, q, J= 7.4 Hz), 1.23 (3 H, t, J- 7.5 Hz). Rt = 1.78 min (Cond.-MDl); LC/MS: Anal. Calcd. for [M+H]+ C6H7ClNO2S: 191.99; found: 191.99. Cap-173
Figure imgf000181_0001
Cap- 173, step a
Figure imgf000181_0002
The following diazotization step was adapted from Barton, A.; Breukelman, S. P.; Kaye, P. T.; Meakins, G. D.; Morgan, D. J. J. C. S. Perkin Trans I 1982, 159- 164: A solution OfNaNO2 (150 mg, 2.17 mmol) in water (1.0 raL) was added dropwise to a stirred, cold (0 0C) solution of methyl 2-amino-5 -ethyl- l,3-thiazole-4- carboxylate (186 mg, 1.0 mmol) in 50% H3PO2 (3.2 mL). The mixture was stirred at 0 0C for 1 h and allowed to warm up to room temperature where it stirred further for 2h. After recooling to 0 0C5 the mixture was treated slowly with a solution of NaOH (85 mg) in wateV(10 mL). The mixture was then diluted with saturated NaHCO3 solution and extracted twice with ether. The organic layers were combined, dried over MgSO4 and concentrated to give methyl 5-ethylthiazole-4-carboxylate (i.e. Cap- 173, step a) (134 mg, 78%) as an orange oil (85% pure) which was used directly in the next reaction. R4 = 1.58 min (Cond.-MDl); LC/MS: Anal. Calcd. for [M+H]+ C7Hi0NO2S: 172.05; found: 172.05.
Cap-173
To a solution of methyl 5-ethyithiazole-4-carboxylate (134 mg) in THF/H2O/MeOH (18 mL/ 2.7 mL/ 11 mL) was added LiOH (281 mg, 11.74 mmol). The mixture was stirred at room temperature overnight before it was concentrated down and neutralized with IiV HCl in ether (25 mL). The residue was extracted twice with ethyl acetate and the organic layers were combined, dried over MgSθ4 and evaporated to yield Cap- 173 (90 mg, 73%) as an orange solid which was used without further purification. 1H NMR (300 MHz, DMSO-d6) δ ppm 12.74-13.04 (1 H, m), 3.20 (2 H, q, J- 7.3 Hz), 1.25 (3 H5 X, J= 7.5 Hz). Rt - 1.27 min (Cond.-MDl); LC/MS: Anal. Calcd. for [M+Hf C6H8NO2S: 158.03; found: 158.04.
Cap- 174
Figure imgf000182_0001
Cap-174, step a
Figure imgf000182_0002
Triflic anhydride (5.O g, 18.0 mmol) was added dropwise to a cold (0 °C) solution of methyl 3-hydroxypicolinate (2.5 g, 16.3 mmol) and TEA (2.5 mL, 18.0 mmol) in CH2Cl2 (80 mL). The mixture was stirred at 0 0C for Ih before it was allowed to warm up to room temperature where it stirred for an additional 1 h. The mixture was then quenched with saturated NaHCO3 solution (40 mL) and the organic layer was separated, washed with brine, dried over MgSO4 and concentrated to give methyl 3-(trifluoromethylsulfonyloxy)picolinate {i.e. Cap-174, step a) (3.38 g, 73%) as a dark brown oil (>95% pure) which was used directly without further purification. 1H NMR (300 MHz, CDCl3) δ ppm 8.72-8.79 (1 H, m), 7.71 (1 H, d, J= 1.5 Hz)5 7.58-7.65 (1 H, m), 4.04 (3 H, s). R4 - 1.93 min (Cond.-MDl); LC/MS: Anal. Calcd. for [M+H]+ C8H7F3NO5S: 286.00; found: 286.08.
Cap-174
To a solution of methyl 3-(trifIuoromethylsulfonyloxy)picolinate (570 mg, 2.0 mmol) in DMF (20 mL) was added LiCl (254 mg, 6.0 mmol), tributyl(vmyl)starmane (761 mg, 2,4 mmol) and bis(triphenylphosphine)palladiurn dichloride (42 mg, 0.06 mmol). The mixture was heated at 1000C overnight before a saturated solution of KF (20 mL) was added to the reaction mixture at room temperature. This mixture was stirred for 4 h before it was filtered through diatomaceous earth (Celite®) and the pad was washed with ethyl acetate. The aqueous phase of the filtrate was then separated and concentrated down in vacuo. The residue was treated with 4NHCl in dioxanes (5 mL) and the resulting mixture was extracted with methanol, filtered and evaporated to afford Cap-174 (260 mg) as a green solid which was slightly contaminated with inorganic salts but was used without further purification. 1H NMR (300 MHz, DMSCMi6) δ ppm 8.21 (1 H5 d, J= 3.7 Hz), 7.81-7.90 (1 H, m), 7.09 (1 H, dd, J= 7.7, 4.8 Hz), 6.98 (1 H, dd, J= 17.9, 11.3 Hz), 5.74 (1 H, dd, J= 17.9, 1.5 Hz), 5.20 (1 H, d, J- 11.0 Hz). Rt = 0.39 min (Cond.-MDl); LC/MS: Anal. Calcd. for [M+H]+ C8H8NO2: 150.06; found: 150.07.
Cap- J 75
Figure imgf000183_0001
Cap- 175, step a
Figure imgf000183_0002
To a solution of methyl 3-(trifluoromethylsulfonyloxy)picolinate (i.e. Cap 173, step a) (570 mg, 2.0 mmol), an intermediate in the preparation of Cap-174, in DMF (20 mL) was added LiCl (254 mg, 6.0 mmol), tributyl(vinyl)stannane (761 mg, 2.4 mmol) and bis(triphenylphosphine)palladium dichloride (42 mg, 0.06 mmol). The mixture was heated at 100 0C for 4 h before the solvent was removed in vacuo. The residue was taken up in acetonitrile (50 mL) and hexanes (50 mL) and the resulting mixture was washed twice with hexanes. The acetonitrile layer was then separated, filtered through Celite, and evaporated. Purification of the residue by flash chromatography on a Horizon instrument (gradient elution with 25% ethyl acetate in hexanes to 65% ethyl acetate in hexanes) afforded methyl 3-vinylpicolinate (i.e, Cap- 175, step a) (130 mg, 40%) as a yellow oil. 1H NMR (300 MHz, CDCl3) δ ppm 8.60 (1 H, dd, J= 4.6, 1.7 Hz), 7.94 (1 H, d, J= 7.7 Hz), 7.33-7.51 (2 H, m), 5.72 (1 H, d, J= 17.2 Hz), 5.47 (1 H, d, J- 11.0 Hz), 3.99 (3 H, s). Rt = 1.29 min (Cond.-MDl); LC/MS: Anal. Calcd. for [M+H]+ C9H!0NO2: 164.07; found: 164.06.
Cap- 175, step b
Figure imgf000184_0001
Palladium on carbon (10%, 25 mg) was added to a solution of methyl 3- vinylpicolinate (120 mg, 0.74 mmol) in ethanol (10 rnL). The suspension was stirred at room temperature under an atmosphere of hydrogen for 1 h before it was filtered through Celite and the pad of diatomaceous earth (Celite®) was washed with methanol. The filtrate was concentrated down to dryness to yield methyl 3- ethylpicolinate (i.e. Cap-175, step b) which was taken directly into the next reaction. Rt - 1.15 min (Cond.-MDl); LC/MS: Anal. Calcd. for [M+H]+ C9H)2NO2: 166.09; found: 166.09.
Cap-175
To a solution of methyl 3-ethylpicolinate in THF/H2O/MeOH (5 mL/ 0.75 mL/ 3 mL) was added LiOH (35 mg, 1.47 mmol). The mixture was stirred at room temperature for 2 d before additional LiOH (80 mg) was added. After an additional 24 h at room temperature, the mixture was filtered and the solvent was removed in vacuo. The residue was then treated with 4N HCl in dioxanes (5 mL) and the resulting suspension was concentrated down to dryness to yield Cap~l 75 as a yellow solid which was used without further purification. 1H NMR (300 MHz, DMSO-d6) 6 ppm 8.47 (1 H, dd; J- 4.8, 1.5 Hz), 7.82-7.89 (1 H, m), 7.53 (1 H, dd, J= 7.7, 4.8 Hz), 2.82 (2 H, q, J= 7.3 Hz), 1.17 (3 H9 1, J= 7.5 Hz). Rt - 0.36 min (Cond.-MDl); LC/MS: Anal. Calcd. for [M÷Hf C8H10NO2: 152.07; found: 152.10.
Figure imgf000185_0001
Figure imgf000185_0002
A solution of l,4-dioxaspiro[4.5]decan-8-one (15 g, 96 mmol) in EtOAc (150 mL) was added to a solution of methyl 2-(benzyloxycarbonylamino)-2- (dimethoxyphosphoryl)acetate (21.21 g, 64,0 mmol) in 1,1,3,3-tetramethylguanidine (10.45 mL, 83 mmol) and EtOAc (150 mL). The resulting solution was the stirred at ambient temperature for 72 h and then it was diluted with EtOAc (25 mL). The organic layer was washed with IN HCl (75 mL), H2O (100 mL) and brine (100 mL), dried (MgSθ4), filtered and concentrated. The residue was purified via Biotage (5% to 25 % EtOAc/Hexanes; 30Og column). The combined fractions containing the product were then concentrated under vacuum and the residue was re-crystallized from hexanes/EtOAc to give white crystals that corresponded to methyl 2-
(benzyIoxycarbonyIamino)-2-(l)4-dioxaspiro[4.5]decan-8-ylidene)acetate (6.2 g) 1H NMR (400 MHz5 CDCl3-^ δ ppm 7.30 - 7.44 (5 H, m), 6.02 (1 H, br. s.), 5.15 (2 H, s), 3.97 (4 H, s), 3.76 (3 H, br. s.), 2.84 - 2.92 (2 H, m), 2.47 (2 H, t, J=6.40 Hz), 1.74 - 1.83 (4 H, m). LC (Cond. OLl): Rt = 2.89 min, LC/MS: Anal. Calcd. For [M+Na]+ C19H23NNaO6: 745.21; found; 745.47.
Figure imgf000185_0003
Ester Cap 176, step b was prepared from alkene Cap 176, step a according to the method of Burk, M. J.; Gross, M, F. and Martinez J. P. (J Am. Chem. Soc, 1995, 117, 9375-9376 and references therein): A 500 mL high-pressure bottle was charged with alkene Cap 176, step a (3.5 g, 9.68 mmol) in degassed MeOH (200 mL) under a blanket OfN2. The solution was then charged with (-)-l,2-Bis((2S,5S)-2,5- dimethylphosρholano)ethane(cyclooctadiene)rhodium (I) tetrafluoroborate (0.108 g? 0.194 mmol) and the resulting mixture was flushed with N2 (3x) and charged with H2 (3x). The solution was shaken vigorously under 70 psi of H2 at ambient temperature for 72 h. The solvent was removed under reduced pressure and the remaining residue was taken up in EtOAc. The brownish solution was then filtered through a plug of Silica Gel and eluted with EtOAc. The solvent was concentrated under vacuum to afford a clear oil corresponding to ester Cap 176, step b (3.4 g) .1H NMR (500 MHz, CDCh-d) δ ppm 7.28 - 7.43 (5 H, m), 5.32 (1 H, d, J-9.16 Hz), 5.06 - 5.16 (2 H5 m), 4.37 (1 H, dd, J-9.00, 5.04 Hz), 3.92 (4 H, t, J=3.05 Hz)> 3.75 (3 H, s), 1.64 - 1.92 (4 H, m), 1.37 - 1.60 (5 H, m). LC (Cond. OLl): Rt = 1.95 min. LC/MS: Anal. Calcd. For [M+H]+ Ci9H26NO6: 364.18; found: 364.27.
Cap 176, step c
Figure imgf000186_0001
Ester Cap 176, step b (4.78 g, 13.15 mmol) was dissolved in THF (15 mL) followed by sequential addition of water (10 mL), glacial acetic acid (26.4 mL, 460 mmol) and dichloroacetic acid (5.44 mL, 65.8 mmol). The resulting mixture was stirred for 72 h at ambient temperature, and the reaction was quenched by slow addition of solid Na2CO3 with vigorous stirring until the release of gas was no longer visible. Crude product was extracted into 10% ethyl acetate-dichloromethane and the organic layers were combined, dried (MgSθ4) filtered and concentrated. The resulting residue was purified via Biotage (0 to 30% EtO Ac/Hex; 25 g column) to afford ketone Cap 176, step c (3.86g) as a clear oil. 1H NMR (400 MHz, CDCl3-^l δ ppm 7.28 - 7.41 (5 H, m), 5.55 (1 H, d, J-8.28 Hz), 5.09 (2 H, s), 4.46 (1 H, dd, J-8.16, 5.14 Hz), 3.74 (3 H, s), 2.18 - 2.46 (5 H, m), 1.96 - 2.06 (1 H, m), 1.90 (1 H, ddd, J=12.99, 5.96, 2.89 Hz), 1.44 - 1.68 (2 H5 m, /=12.36, 12.36, 12.36, 12.36, 4.77 Hz). LC (Cond. OLl); R1 = 1.66 min. LC/MS: Anal. Calcd. For [M+Naf CnH2INNaO5: 342.13; found: 342.10.
Cap 176, step d
Figure imgf000187_0001
Deoxo-Fluor® (3.13 mL, 16.97 mmol) was added to a solution of ketone Cap 176, step c (2.71 g, 8.49 mmol) in CH2Cl2 (50 mL) followed by addition of a catalytic ammount of EtOH (0.149 mL, 2.55 mmol). The resulting yellowish solution was stirred at rt overnight. The reaction was quenched by addition of sat. aq, NaHCO3 (25 mL) and the mixture was extracted with EtOAc (3X75 mL)). The combined organic layers were dried (MgSO4), filtered and dried to give a yellowish oil. The residue was purified via Biotage chromatography (2% to 15% EtO Ac/Hex; 9Og column) and a white solid corresponding to the difiuoro amino acid dilforide Cap
176, step d (1.5 g) was recovered. 1H NMR (400 MHz, , CDCl3-^ δ ppm 7.29 - 7.46 (5 H, m), 5.34 (1 H5 d, J=8.28 Hz), 5.12 (2 H5 s), 4.41 (1 H, dd, J=8,66, 4.89 Hz)9 3.77 (3 H5 s), 2.06 - 2.20 (2 H, m), 1.83 - 1.98 (1 H, m), 1.60 - 1.81 (4 H, m), 1.38 - 1.55 (2 H, m). 19F NMR (376 MHz, COClyd) 6 ppm -92.15 (1 F, d, J=237.55 Hz)5 -102.44 (1 F, d, J=235.82 Hz). LC (Cond. OLl): Rt = 1.66 min. LC/MS: Anal. Calcd. For [2MH-Na]+ C34H42F4N2NaO8: 705.28; found: 705.18.
Cap 176, step e
Figure imgf000187_0002
Difluoride Cap 176, step d (4 g, 11.72 mmol) was dissolved in MeOH ( 120 mL) and charged with Pd/C (1.247 g, 1.172 mmol). The suspension was flushed with N2 (3x) and the reaction mixture was placed under 1 atm of H2 (balloon). The mixture was stirred at ambient temperature for 48 h. The suspension was then filtered though a plug of Celite and concentrated under vacuum to give an oil that corresponded to amino acid Cap 176, step e (2.04 g) and that was used without further purification. 1B. NMR (400 MHz, DMSO-d6) δ ppm 3.62 (3 H, s), 3.20 (1 H, d,
/=5.77 Hz)5 1.91 - 2.09 (2 H, m), 1.50 - 1.88 (7 H, m), 1.20 - 1.45 (2 H, m). 19F NMR (376 MHz, DMSO-d6) δ ppm -89.39 (1 F, d, /=232.35 Hz), -100.07 (1 F, d, J=232.35 Hz). 13C NMR (101 MHz, DMSO~d6) δ ppm 175.51 (1 C, s), 124.10 (1 C, t, /=241.21, 238.90 Hz), 57.74 (1 C, s), 51.39 (1 C, s), 39.23 (1 C, br. s.), 32.02 - 33.83 (2 C, m), 25.36 (1 C, d, /-10.02 Hz)5 23.74 (1 C, d, J-9.25 Hz). LC (Cond. OL2): Rt == 0.95 min. LC/MS: Anal. Calcd. For [2M+H]+ Cj8H31F4N2O2: 415.22; found: 415.40.
Cap 176, step f
Figure imgf000188_0001
Methyl chloroformate (1.495 mL, 19.30 mmol) was added to a solution of amino acid Cap 176, step e (2 g, 9.65 mmol) and DIEA (6,74 mL, 38.6 mmol) in CH2Cl2 (100 mL). The resulting solution was stirred at it for 3 h and volatiles were removed under reduced pressure. The residue was purified via Biotage (0% to 20% EtOAc/Hex; 9Og column). A clear oil that solidified upon standing under vacuum and corresponding to carbamate Cap- 176, step j '(2.22 g) was recovered. 1H NMR (500 MHz, COCh-d) δ ppm 5.27 (1 H, d, J=8.55 Hz), 4.39 (1 H, dd, J=8.85, 4.88 Hz), 3.77 (3 H9 s), 3.70 (3 H, s), 2.07 - 2.20 (2 H3 m), 1.84 - 1.96 (1 H, m), 1.64 - 1.82 (4 H, m), 1.39 - 1.51 (2 H, m). 59F NMR (471 MHz, CDCl3O δ ppm -92.55 (1 F, d, J-237.13 Hz), -102.93 (1 F, d, J-237.12 Hz). 13C NMR (126 MHz, CDCl3-^ δ ppm 171.97 (1 C, s), 156.69 (1 C, s), 119.77 - 125.59 (1 C, m), 57.24 (1 C, br. s.), 52.48 (1 C, br. s.)f 52.43 (1 C9 s), 39.15 (1 C, s), 32.50 - 33.48 (2 C, m), 25.30 (1 C, d, J=9.60 Hz), 24.03 (1 C, d, J=9.60 Hz). LC (Cond. OLl): R4 = 1.49 min. LC/MS: Anal. Calcd. For [M+Na]+ Cj IHi7F2NNaO4: 288.10; found: 288.03.
Cap- 176 A solution of LiOH (0.379 g, 15.83 mmol) in Water (25 mL) was added to a solution of carbamate Cap-176, step/ '(2.1 g, 7.92 mmol) in THF (75 mL) and the resulting mixture was stirred at ambient temperature for 4 h. THF was removed under vacuum and the remaining aqueous phase was acidified with IN HCl solution (2 mL) and then extracted with EtOAc (2 X 50 mL). The combined organic layers were dried (MgSO4), filtered and concentrated to give a white foam corresponding to Cap- 176 (1.92 g). 1H NMR (400 MHz, DMSO-d6) δ ppm 12.73 (1 H5 s), 7.50 (1 H, d, J=8.78 Hz)5 3.97 (1 H, dd, J=8.535 6.02 Hz), 3.54 (3 H, s), 1.92 - 2.08 (2 H, m), 1.57 - 1.90 (5 H5 m), 1.34 - 1.48 (1 H5 m), 1.27 (1 H, qd, /=12.72, 3.26 Hz). 19F NMR (376 MHz5 DMSO-d6) δ ppm -89.62 (1 F, d5 J=232.35 Hz)1 -99.93 (1 F, d5 J=232.35 Hz). LC (Cond. OL2): R1 = 0.76 min. LC/MS: Anal Calcd. FOr [M-H]+ Ci0Hi4F2NO4: 250.09; found: 250.10.
BIOLOGICAL ACTIVITY
An HCV Replion assay was utilized in the present disclosure, and was prepared, conducted and validated as described in commonly owned
PCT/US2006/022197 and in O'Boyle et. al. Λntimicrob Agents Chemother. 2005 Apr; 49(4): 1346-53. Assay methods incorporating luciferase reporters have also been used as described (Apath.com).
HCV-neo replicon cells and HCV replicon cells containing mutations in the NS5A region were used to test the currently described family of compounds. The compounds were determined to have more than 10-fold less inhibitory activity on cells containing mutations than wild-type cells. Thus, the compounds of the present disclosure can be effective in inhibiting the function of the HCV NS 5 A protein and are understood to be as effective in combinations as previously described in application PCT/US2006/022197 and commonly owned WO/O4014852. Further, the compounds of the present disclosure can be effective against the HCV Ib genotype. It should also be understood that the compounds of the present disclosure can inhibit multiple genotypes of HCV. Table 2 shows the EC50 (Effective 50% inhibitory concentration) values of representative compounds of the present disclosure against the HCV Ib genotype, In one embodiment, compounds of the present disclosure are inhibitory versus Ia, Ib, 2a, 2b5 3a, 4a, and 5a genotypes. Activity ranges are as follows: A - >100 nM; B = 1-100 nM; C - 101-999 pM; and D = 1-100 pM.
Table 2
Figure imgf000190_0001
The compounds of the present disclosure may inhibit HCV by mechanisms in addition to or other than NS5A inhibition. In one embodiment the compounds of the present disclosure inhibit HCV replicon and in another embodiment the compounds of the present disclosure inhibit NS5A.
It will be evident to one skilled in the art that the present disclosure is not limited to the foregoing illustrative examples, and that it can be embodied in other specific forms without departing from the essential attributes thereof. It is therefore desired that the examples be considered in all respects as illustrative and not restrictive, reference being made to the appended claims, rather than to the foregoing examples, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

CLAIMSWHAT IS CLAIMED IS:
1. A compound of Formula (I):
Figure imgf000192_0001
(I) or a pharmaceutically acceptable salt thereof, wherein:
Z is oxygen (O) or N-H; R1 is hydrogen (H) or ~~C(O)RX;
R2 is hydrogen (H) or -C(O)RV;
Rx and Ry are independently selected from cycloalkyl, heteroaryl, heterocyclyl, alkoxy, and alkyl, said alkyl being substituted by one or more substituents independently selected from aryl, alkenyl, cycloalkyl, heterocyclyl, heteroaryl, -OR3, -C(O)OR4, -NRaRb, and -C(0)NRcRd, wherein any said aryl and heteroaryl may optionally be substituted with one or more substituents independently selected from alkyl, haloalkyl, arylalkyl, heterocyclyl, heterocyclylalkyl, halogen, cyano, nitro, -C(O)OR4, -OR5, -NRaRb, (NRaRb)alkyl, and (MeO)(HO)P(O)O-, and wherein any said cycloalkyl and heterocyclyl may optionally be fused onto an aromatic ring and may optionally be substituted with one or more substituents independently selected from alkyl, hydroxyl, halogen, aryl, -NRaRb, oxo, and -C(O)OR4;
R^ is hydrogen, alkyl, or arylalkyl; R4 is alkyl or arylalkyl;
R5 is hydrogen, alkyl, or arylalkyl; Ra and Rb are independently selected from hydrogen, alkyl, cycloalkyl, arylalkyl, heteroaryl, -C(O)R6, -C(O)OR7, -C(0)NRcRd, and (NRcRd)alkyl, or alternatively, Ra and Rb, together with the nitrogen atom to which they are attached, form a five- or six-membered ring or bridged bicyclic ring structure, wherein said five- or six-membered ring or bridged bicyclic ring structure optionally may contain one or two additional heteroatoms independently selected from nitrogen, oxygen, and sulfur and may contain one, two, or three substituents independently selected from C] to Cg alkyl, C1 to C4 haloalkyl, aryl, hydroxyl, C] to Cg alkoxy, C] to C4 haloalkoxy, and halogen; R6 is alkyl;
R7 is alkyl, arylalkyl, cycloalkyl, or haloalkyl;
R30 and R31 are independently selected from hydrogen and alkyl; wherein the alkyl can optionally form a fused three- to six-membered ring with an adjacent carbon atom or optionally form a spirocyclic three- to six-membered ring with the carbon to which it is attached; and
Rc and Rd are independently selected from hydrogen, alkyl, arylalkyl, and cycloalkyl.
2. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein Z is oxygen.
3. The compound according to claim 1, or a pharmaceutically acceptable salt thereof, wherein Z is NH.
4. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein:
R1 is -C(O)RX;
R2 is -C(O)RY; and
Rx and Ry are independently alkyl substituted by at least one -NRaRb, characterized by Formula (A) :
Figure imgf000194_0001
(A) wherein: m is 0 or 1 ; R8 is hydrogen or alkyl;
R9 is selected from hydrogen, cycloalkyl, aryl, heteroaryl, heterocyclyl, and alkyl optionally substituted with a substituent selected from aryl, alkenyl, cycloalkyl, heterocyclyl, heteroaryl, heterobicyclyl, -OR3, -C(O)OR4, -NRaRb, and -C(0)NRcRd, wherein any said aryl and heteroaryl may optionally be substituted with one or more substituents independently selected from alkyl, haloalkyl, arylalkyl, heterocyclyl, heterocyclylalkyl, halogen, cyano, nitro, -C(O)OR4, -OR5, -NRaRb, (NRaRb)alkyl, and (MeO)(HO)P(O)O-, and wherein any said cycloalkyl and heterocyclyl may optionally be fused onto an aromatic ring and may optionally be substituted with one or more substituents independently selected from alkyl, hydroxyl, halogen, aryl, -NRaRb, oxo, and -C(O)OR4; and
R3, R4, R5, Ra, Rb, Rc, and Rd are defined as in claim 1.
5. The compound of claim 4, or a pharmaceutically acceptable salt thereof, wherein: m is O;
R8 is hydrogen or Ci to C4 alkyl;
R9 is selected from hydrogen, Cj to C5 alkyl optionally substituted with -OR12, C3 to C6 cycloalkyl, allyl, -CH2C(O)NRcRd, (NRcRd)alkyl>
Figure imgf000195_0001
wherein: j is O or 1 ; k is 1, 2, or 3; n is 0 or an integer selected from 1 through 4; each R10 is independently hydrogen, C1 to C4 alkyl, C1 to C4 haloalkyl, halogen, nitro, -OBn, or (MeO)(OH)P(O)Os
R1 1 is hydrogen, Cj to C4 alkyl, or benzyl; R12 is hydrogen, C1 to C4 alkyl, or benzyl; Ra is hydrogen or C^ to C4 alkyl; Rb is C1 to C4 alkyl, C3 to C6 cycloalkyl, benzyl, 3-pyridyl, pyrimidin-5-yl, acetyl, -C(O)OR7, or -C(0)NRcRd; R7 is C1 to C4 alkyl or C1 to C4 haloalkyl;
Rc is hydrogen or C1 to C4 alkyl; and
Rd is hydrogen, C1 to C4 alkyl, or C3 to Cg cycloalkyl.
6. The compound of claim 4, or a pharmaceutically acceptable salt thereof, wherein: m is O;
R8 is hydrogen;
R9 is phenyl optionally substituted with one up to five substituents independently selected from C1 to Cg alkyl, C1 to C4 haloalkyl, halogen, C1 to Cg alkoxy, hydroxyl, cyano, and nitro; and
NRaRb is a heterocyclyl or heterobicyclyl group selected from:
Figure imgf000196_0001
wherein; n is O, l, or 2; each Rl3 is independently selected from C1 to C^ alkyl, phenyl, trifluoromethyl, halogen, hydroxyl, raethoxy, and oxo; and
R14 is C1 to C6 alkyl, phenyl, benzyl, or -C(O)OR15 group, wherein R15 is C1 to C4 alkylj phenyl, or benzyl
7, The compound of claim 4, or a pharmaceutically acceptable salt thereof, wherein: m is 1;
R^ is hydrogen;
R9 is Cj to Cg alkyl, arylalkyl, or heteroarylalkyl;
Ra is hydrogen; and
Rb is -C(O)OR7, wherein R7 is C1 to C6 alkyl
8. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein:
RUs -C(O)R*;
R2 is -C(O)Ry; and
Rx and Ry are heteroaryl or heterocyclyl independently selected from:
Figure imgf000197_0001
Figure imgf000198_0001
wherein: n is 0 or art integer selected from 1 through 4; each R13 is independently selected from hydrogen, C1 to C^ alley!,, Cj to C4 haloalkyl, phenyl, benzyl, Cj to Cg alkoxy, Ci to C4 haloalkoxy, heterocyclyl, halogen, NRcRd, hydroxyl, cyano, and oxo} where Rc and Rd are independently hydrogen or C] to C4 alkyl; and
R14 is hydrogen (H)5 C1 to C6 alkyl, benzyl, or -C(O)OR4, wherein R4 is C1 to C6 alkyl.
9. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein:
R1 is -C(O)RX; R2 is -C(O)Ry; and
Rx and Ry are cycloalkyl independently selected from:
Figure imgf000198_0002
wherein: j is O, 1, 2, or 3; k is 0, 1, or 2; n is 0 or an integer selected from 1 though 4; each R13 is independently selected from hydrogen, Cj to Cg alkyl, Cj to C4 haloalkyl, Cj to C6 alkoxy, halogen, hydroxyl, cyano, and nitro; and
Ra and Rb are independently hydrogen, Cj to C6 alkyl, or -C(O)OR7, wherein R7 is C1 to C6 alkyl.
10. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein:
R1 is -C(O)RX;
R2 is -C(O)Ry; and Rx and Ry are independently arylalkyl optionally substituted with
(NRaRb)alkyl, wherein Ra and Rb are independently hydrogen, Cj to C6 alkyl, or benzyl, or alternatively, Ra and Rb, together with the nitrogen atom to which they are
attached, form a five- or six-membered ring selected from
Figure imgf000199_0001
Figure imgf000199_0002
wherein R15 is hydrogen, Cj to C6 alkyl, or benzyl.
11. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein R1 and R2 are the same and are selected from the group consisting of:
Figure imgf000200_0001
wherein a squiggle bond ( ιΛΛ/v ) in the structure indicates that a stereogenic center to which the bond is attached can take either (R)- or (S)- configuration so long as chemical bonding principles are not violated.
12. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein:
R1 is -C(O)R*; R2 is -C(O)RV; and Rx and Ry are both t-butoxy.
13. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein R1 and R2 are both hydrogen.
14. A compound of Formula (II) :
Figure imgf000201_0001
(II) or a pharmaceutically acceptable salt thereof, wherein:
Z is oxygen (O) or N-H; RUs hydrogen (H) or -C(O)R*;
R2 is hydrogen (H) or -C(O)Ry;
Rx and Ry are independently selected from cycloalkyl, heteroaryl, heterocyclyl, alkoxy, and alkyl, said alkyl being substituted by one or more substituents independently selected from aryl, alkenyl, cycloalkyl, heterocyclyl,, heteroaryl, -OR3, -C(O)OR4, -NRaRb, and -C(0)NRcRd, wherein any said aryl and heteroaryl may optionally be substituted with one or more substituents independently selected from alkyl, haloalkyl, arylalkyl, heterocyclyl, heterocyclylalkyl, halogen, cyano, nitro, -C(O)OR4, -OR5, -NRaRb, (NRaRb)alkyl, and (MeO)(HO)P(O)O-, and wherein any said cycloalkyl and heterocyclyl may optionally be fused onto an aromatic ring and may optionally be substituted with one or more substituents independently selected from alkyl, hydroxy!, halogen, aryl, -NRsRb, oxo5 and -C(O)OR4;
R3 is hydrogen, alkyl, or arylalkyl;
R4 is alkyl or arylalkyl; R5 is hydrogen, alkyl, or arylalkyl;
Ra and Rb are independently selected from hydrogen, alkyl, cycloalkyl, arylalkyl, heteroaryl, -C(O)Ro, -C(O)OR7, -C(0)NRcRd, and (NRcRd)alkyl, or alternatively, Ra and Rb, together with the nitrogen atom to which they are attached, form a five- or six-membered ring or bridged bicyclic ring structure, wherein said five- or six-membered ring or bridged bicyclic ring structure optionally may contain one or two additional heteroatoms independently selected from nitrogen, oxygen, and sulfur and may contain one, two, or three substituents independently selected from Cj to C6 alkyl, C1 to C4 haloalkyl, aryl, hydroxyl, C1 to C6 alkoxy, C1 to C4 haloalkoxy, and halogen; R6 is alkyl;
R7 is alkyl, arylalkyl, or haloalkyl; and
Rc and Rd are independently selected from hydrogen, alkyl, arylalkyl, and cycloalkyl.
15. A compound, or a pharmaceutically acceptable salt thereof, selected from the group consisting of:
(S)-ført-butyl 2-(6-(4-(2-((S)- 1 -(terϊ-butoxycarbonyl)pyrrolidin-2-yl)- 1 H- imidazol-5-yl)phenyl)benzo[d]isoxazol-3-ylcarbamoyl)pyrrolidine-l-carboxylate;
(S)-N-(6-(4-(2-((S)-pyrrolidin-2-yl)-lH-imidazol-5- yl)phenyl)benzo[d]isoxazol-3-yl)pyrrolidine-2-carboxamide;
(S)-l-((S)-2-methoxycarbonyl-3-me1hylbutanoyl)-N-(6-(4-(2-((S)-l-((S)-2- methoxycarbonyl-3-methylbutanoyl)pyrrolidin-2-yl)-lH-imidazol-5- yl)phenyl)benzo[d]isoxazol-3-yl)pyrrolidine-2-carboxamide;
(S)-N-(5-(4-(2-((S>pyπOlidin-2-yl)-lH-imidazol-5- yl)phenyl)benzo[d]isoxazol-3-yl)pyrrolidine-2-carboxamide; (S)-l-((S)-2-methoxycarbonylaminopropanoyl)-N-(6-(4-(2-((S)-l-((S)-2- methoxycarbonylaminopropanoyl)pyrroHdin-2-yl)~ 1 H-imidazol-5- yl)phenyl)benzo[d]isoxazol-3-yl)pyrrolidine-2-carboxamide; tert-butyl 6-(4-(2-((S)-I -(ferf-butoxycarbonyl)pyrrolidin-2-yl)- 1 H-imidazol~5- yl)phenyl)-3-((S)-l-(ϊerϊ-butoxycarbonyl)pyrrolidine-2-carboxamido)~lH-indazole-l- carboxylate;
(S)-N-(6-(4-(2-((S)-pyπolidin-2-yl)- 1 H-imidazol-5-yl)phenyl)- 1 H-indazol-3- yl)pyrrolidine-2-carboxamide;
(S)-I -((S)-2-methoxycarbonylaminopropanoyl)-N-(6-(4-(2-((S)-l-((S)-2- methoxycarbonylaminopropanoyl)pyrrolidin-2-yl)- 1 H-imidazol~5-yl)phenyl)- 1 H- indazol-3-yl)pyrrolidine-2-carboxamide;
(S)~N-(5-(4-(2-((S)-pyrrolidin-2-yl)-lH-imidazol-5-yl)phenyl)-lH~indazol-3- yl)pyrrolidine-2-carboxamide;
(S)-l-((S)-2-methoxycarbonylaminopiopanoyl)-N-(5-(4-(2-((S)-l-((S)-2- methoxycarbonylaminopropanoyl)pyrτoIidm-2-yl)- 1 H-imidazol-5-yl)phenyl)~ 1 H- mdazol-3-yl)pyrrolidine-2-carboxamide; and corresponding stereoisomers and taυtomers thereof,
16, A compound, or a pharmaceutically acceptable salt thereof, selected from the group consisting of:
Figure imgf000203_0001
Figure imgf000203_0002
Figure imgf000204_0001
Figure imgf000204_0002
Figure imgf000204_0003
Figure imgf000204_0004
Figure imgf000205_0001
Figure imgf000205_0002
Figure imgf000205_0003
Figure imgf000205_0004
Figure imgf000206_0001
Figure imgf000206_0002
Figure imgf000206_0003
Figure imgf000206_0004
Figure imgf000207_0001
Figure imgf000207_0002
corresponding stereoisomers and tautomers thereof.
17. A composition comprising a compound of claim 1 , or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier,
18. A method of treating an HCV infection in a patient, comprising administering to the patient a therapeutically effective amount of a compound of claim 1 , or a pharmaceutically acceptable salt thereof.
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US20110130433A1 (en) 2011-06-02
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JP5615352B2 (en) 2014-10-29

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