US20110274648A1 - Hepatitis C Virus Inhibitors - Google Patents

Hepatitis C Virus Inhibitors Download PDF

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Publication number
US20110274648A1
US20110274648A1 US12/939,778 US93977810A US2011274648A1 US 20110274648 A1 US20110274648 A1 US 20110274648A1 US 93977810 A US93977810 A US 93977810A US 2011274648 A1 US2011274648 A1 US 2011274648A1
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United States
Prior art keywords
methyl
imidazol
amino
azabicyclo
methoxycarbonyl
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Abandoned
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US12/939,778
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English (en)
Inventor
Rico Lavoie
John A. Bender
Zhong Yang
Makonen Belema
Omar D. Lopez
Qi Chen
Gan Wang
Piyasena Hewawasam
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Bristol Myers Squibb Co
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Bristol Myers Squibb Co
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Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=43466793&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20110274648(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Bristol Myers Squibb Co filed Critical Bristol Myers Squibb Co
Priority to US12/939,778 priority Critical patent/US20110274648A1/en
Assigned to BRISTOL-MYERS SQUIBB COMPANY reassignment BRISTOL-MYERS SQUIBB COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LAVOIE, RICO, YANG, ZHONG, WANG, GAN, BENDER, JOHN A., CHEN, QI, HEWAWASAM, PIYASENA, LOPEZ, OMAR D., BELEMA, MAKONEN
Publication of US20110274648A1 publication Critical patent/US20110274648A1/en
Priority to US13/672,266 priority patent/US20130115193A1/en
Priority to US14/668,090 priority patent/US20150197499A1/en
Priority to US14/807,084 priority patent/US9776981B2/en
Priority to US14/806,964 priority patent/US9303007B2/en
Priority to US15/689,286 priority patent/US20170355689A1/en
Abandoned legal-status Critical Current

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    • C07D309/04—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having no double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
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    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/4164—1,3-Diazoles
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    • A61K31/4545—Non condensed piperidines, e.g. piperocaine containing further heterocyclic ring systems containing a six-membered ring with nitrogen as a ring hetero atom, e.g. pipamperone, anabasine
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    • A61K31/535—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines
    • A61K31/5375—1,4-Oxazines, e.g. morpholine
    • A61K31/5377—1,4-Oxazines, e.g. morpholine not condensed and containing further heterocyclic rings, e.g. timolol
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    • C07D401/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing three or more hetero rings
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Definitions

  • the present disclosure is generally directed to antiviral compounds, and more specifically directed to compounds which can inhibit the function of the NS5A protein encoded by Hepatitis C virus (HCV), compositions comprising such compounds, and methods for inhibiting the function of the NS5A protein.
  • HCV Hepatitis C virus
  • 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.
  • 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.
  • 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.
  • ORF open reading frame
  • 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 NS3 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 NS3 protease and assisting in the membrane localization of NS3 and other viral replicase components.
  • NS3-NS4A complex 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 with other HCV proteins, including NS5A, in a replicase complex.
  • HCV NS5A protein is described, for example, in the following references: Tan, S. L. et al., Virology, 284:1-12 (2001); Park, K.-J. et al., J. Biol. Chem., 30711-30718 (2003); Tellinghuisen, T. L. et al., Nature, 435:374 (2005); Love, R. A. et al., J. Virol., 83:4395 (2009); Appel, N. et al., J. Biol. Chem., 281:9833 (2006); Huang, L., J. Biol. Chem., 280:36417 (2005); Rice, C. et al., World Patent Application WO 2006/093867.
  • X and X′ are each independently selected from CH, CR 1 , and N;
  • Y and Y′ are each independently selected from CH, CR 2 , and N;
  • R 1 and R 2 are independently selected from
  • each R 3 is independently selected from hydrogen, cyano, and halo
  • each R 4 is independently selected from hydrogen, and alkyl, wherein the alkyl can optionally form a fused three- to five-membered ring with an adjacent carbon atom wherein said ring is optionally substituted with one or two methyl groups; or, R 4 and the carbon to which it is attached form an ethylene group;
  • each R 5 is independently selected from hydrogen and —C(O)R 6 ;
  • each R 6 is independently selected from alkoxy, alkyl, arylalkoxy, arylalkyl, cycloalkyl, heterocyclyl, heterocyclylalkyl, (NR c R d )alkenyl, and (NR c R d )alkyl; and
  • each R 7 and R 8 is independently selected from hydrogen and alkyl.
  • the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein:
  • X and X′ are independently selected from CH and CR 1 ;
  • Y, and Y′ are independently selected from CH and CR 2 .
  • X and X′ are independently selected from CH and CR 1 ;
  • Y and Y′ are each N.
  • the present disclosure provides a compound of Formula (I), or a pharmaceutically acceptable salt thereof, wherein:
  • Y and X′ are each N;
  • X is selected from CH and CR 1 ;
  • Y′ is selected from CH and CR 2 .
  • X′ is N
  • X is selected from CH and CR 1 ;
  • Y and Y′ are independently selected from CH and CR 2 .
  • the present disclosure provides a composition comprising a compound of Formula (I), or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
  • the composition further comprises at least one additional compound having anti-HCV activity.
  • at least one of the additional compounds is an interferon or a ribavirin.
  • the interferon is selected from interferon alpha 2B, pegylated interferon alpha, consensus interferon, interferon alpha 2A, and lymphoblastoid interferon tau.
  • the present disclosure provides a composition
  • 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.
  • the present disclosure provides a composition
  • 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.
  • 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.
  • 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.
  • 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), or a pharmaceutically acceptable salt thereof.
  • at least one of the additional compounds is an interferon or a ribavirin.
  • the interferon is selected from interferon alpha 2B, pegylated interferon alpha, consensus interferon, interferon alpha 2A, and lymphoblastoid interferon tau.
  • 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.
  • 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 NS5A protein, and IMPDH for the treatment of an HCV infection.
  • 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.
  • any substituent or variable at a particular location in a molecule be independent of its definitions elsewhere in that molecule.
  • R 1 and R 2 both contain an R 4 group, the two R 4 groups may be the same or different.
  • aryl, cycloalkyl, and heterocyclyl groups of the present disclosure may be substituted as described in each of their respective definitions.
  • aryl part of an arylalkyl group may be substituted as described in the definition of the term “aryl”.
  • alkenyl refers to a straight or branched chain group of two to six carbon atoms containing at least one carbon-carbon double bond.
  • alkenyloxy refers to an alkenyl group attached to the parent molecular moiety through an oxygen atom.
  • alkenyloxycarbonyl refers to an alkenyloxy group attached to the parent molecular moiety through a carbonyl group.
  • alkoxy refers to an alkyl group attached to the parent molecular moiety through an oxygen atom.
  • alkoxyalkyl refers to an alkyl group substituted with one, two, or three alkoxy groups.
  • alkoxyalkylcarbonyl refers to an alkoxyalkyl group attached to the parent molecular moiety through a carbonyl group.
  • alkoxycarbonyl refers to an alkoxy group attached to the parent molecular moiety through a carbonyl group.
  • alkylcarbonyloxy refers to an alkylcarbonyl group attached to the parent molecular moiety through an oxygen atom.
  • alkyl refers to a group derived from a straight or branched chain saturated hydrocarbon containing from one to six carbon atoms.
  • R 4 when R 4 is alkyl, the alkyl can optionally form a fused three-membered ring with an adjacent carbon atom to provide the structure shown below.
  • n is selected from 1 and 2.
  • alkylcarbonyl refers to an alkyl group attached to the parent molecular moiety through a carbonyl group.
  • alkylsulfanyl refers to an alkyl group attached to the parent molecular moiety through a sulfur atom.
  • alkylsulfonyl refers to an alkyl group attached to the parent molecular moiety through a sulfonyl group.
  • aryl refers to a phenyl group, or a bicyclic fused ring system wherein one or both of the rings is a phenyl group.
  • Bicyclic fused ring systems consist of a phenyl group fused to a four- to six-membered aromatic or non-aromatic carbocyclic ring.
  • the aryl groups of the present disclosure can be attached to the parent molecular moiety through any substitutable carbon atom in the group.
  • Representative examples of aryl groups include, but are not limited to, indanyl, indenyl, naphthyl, phenyl, and tetrahydronaphthyl.
  • the aryl groups of the present disclosure are optionally substituted with one, two, three, four, or five substituents independently selected from alkenyl, alkoxy, alkoxyalkyl, alkoxycarbonyl, alkyl, alkylcarbonyl, a second aryl group, arylalkoxy, arylalkyl, arylcarbonyl, cyano, halo, haloalkoxy, haloalkyl, heterocyclyl, heterocyclylalkyl, heterocyclylcarbonyl, hydroxy, hydroxyalkyl, nitro, —NR x R y , (NR x R y )alkyl, oxo, and —P(O)OR 2 , wherein each R is independently selected from hydrogen and alkyl; and wherein the alkyl part of the arylalkyl and the heterocyclylalkyl are unsubstituted and wherein the second aryl group, the aryl part of the aryl
  • arylalkoxy refers to an aryl group attached to the parent molecular moiety through an alkoxy group.
  • arylalkoxycarbonyl refers to an arylalkoxy group attached to the parent molecular moiety through a carbonyl group.
  • arylalkyl refers to an alkyl group substituted with one, two, or three aryl groups.
  • the alkyl part of the arylalkyl is further optionally substituted with one or two additional groups independently selected from alkoxy, alkylcarbonyloxy, halo, haloalkoxy, haloalkyl, heterocyclyl, hydroxy, and —NR c R d , wherein the heterocyclyl is further optionally substituted with one or two substituents independently selected from alkoxy, alkyl, unsubstituted aryl, unsubstituted arylalkoxy, unsubstituted arylalkoxycarbonyl, halo, haloalkoxy, haloalkyl, hydroxy, —NR x R y , and oxo.
  • arylcarbonyl refers to an aryl group attached to the parent molecular moiety through a carbonyl group.
  • cyano refers to —CN.
  • cycloalkyl refers to a saturated monocyclic or bicyclic hydrocarbon ring system having three to fourteen carbon atoms and zero heteroatoms.
  • Representative examples of cycloalkyl groups include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, bicyclo[3.1.1]heptyl, and adamantyl.
  • the cycloalkyl groups of the present disclosure are optionally substituted with one, two, three, four, or five substituents independently selected from alkoxy, alkyl, aryl, cyano, halo, haloalkoxy, haloalkyl, heterocyclyl, hydroxy, hydroxyalkyl, nitro, and —NR x R y , wherein the aryl and the heterocyclyl are further optionally substituted with one, two, or three substituents independently selected from alkoxy, alkyl, cyano, halo, haloalkoxy, haloalkyl, hydroxy, nitro, and oxo.
  • cycloalkyloxy refers to a cycloalkyl group attached to the parent molecular moiety through an oxygen atom.
  • cycloalkyloxycarbonyl refers to a cycloalkyloxy group attached to the parent molecular moiety through a carbonyl group.
  • cycloalkylsulfonyl refers to a cycloalkyl group attached to the parent molecular moiety through a sulfonyl group.
  • ethylene refers to ⁇ CH 2 .
  • halo and “halogen,” as used herein, refers to Cl, Br, F, or I.
  • haloalkoxy refers to a haloalkyl group attached to the parent molecular moiety through an oxygen atom.
  • haloalkoxycarbonyl refers to a haloalkoxy group attached to the parent molecular moiety through a carbonyl group.
  • haloalkyl refers to an alkyl group substituted with one, two, three, or four halogen atoms.
  • heterocyclyl refers to a four-, five-, six-, or seven-membered ring containing one, two, three, or four heteroatoms independently selected from nitrogen, oxygen, and sulfur.
  • the four-membered ring has zero double bonds, the five-membered ring has zero to two double bonds, and the six- and seven-membered rings have zero to three double bonds.
  • heterocyclyl also includes bicyclic groups in which the heterocyclyl ring is fused to another monocyclic heterocyclyl group or a three- to seven-membered aromatic or non-aromatic carbocyclic ring; bicyclic groups in which the heterocyclyl ring is substituted with a three- to seven-membered spirocyclic ring; as well as bridged bicyclic groups such as 7-azabicyclo[2.2.1]hept-7-yl, 2-azabicyclo[2.2.2]oct-2-yl, and 2-azabicyclo[2.2.2]oct-3-yl.
  • heterocyclyl groups of the present disclosure can be attached to the parent molecular moiety through any carbon atom or nitrogen atom in the group.
  • heterocyclyl groups include, but are not limited to, benzothienyl, furyl, imidazolyl, indolinyl, indolyl, isoquinolinyl, isothiazolyl, isoxazolyl, morpholinyl, oxazolyl, piperazinyl, piperidinyl, pyrazolyl, pyridinyl, pyrrolidinyl, pyrrolopyridinyl, pyrrolyl, quinolinyl, tetrahydropyranyl, thiazolyl, thienyl, and thiomorpholinyl.
  • heterocyclyl groups of the present disclosure are optionally substituted with one, two, three, four, or five substituents independently selected from alkenyl, alkoxy, alkoxyalkyl, alkoxycarbonyl, alkyl, alkylcarbonyl, aryl, arylalkoxycarbonyl, arylalkyl, arylcarbonyl, cyano, halo, haloalkoxy, haloalkyl, a second heterocyclyl group, heterocyclylalkyl, heterocyclylcarbonyl, hydroxy, hydroxyalkyl, nitro, —NR x R y , (NR x R y )alkyl, and oxo, wherein the alkyl part of the arylalkyl and the heterocyclylalkyl are unsubstituted and wherein the aryl, the aryl part of the arylalkyl, the aryl part of the arylcarbonyl, the second heterocyclyl
  • heterocyclylalkoxy refers to a heterocyclyl group attached to the parent molecular moiety through an alkoxy group.
  • heterocyclylalkoxycarbonyl refers to a heterocyclylalkoxy group attached to the parent molecular moiety through a carbonyl group.
  • heterocyclylalkyl refers to an alkyl group substituted with one, two, or three heterocyclyl groups.
  • the alkyl part of the heterocyclylalkyl is further optionally substituted with one or two additional groups independently selected from alkoxy, alkylcarbonyloxy, aryl, halo, haloalkoxy, haloalkyl, hydroxy, and —NR c R d , wherein the aryl is further optionally substituted with one or two substituents independently selected from alkoxy, alkyl, unsubstituted aryl, unsubstituted arylalkoxy, unsubstituted arylalkoxycarbonyl, halo, haloalkoxy, haloalkyl, hydroxy, and —NR x R y .
  • heterocyclylalkylcarbonyl refers to a heterocyclylalkyl group attached to the parent molecular moiety through a carbonyl group.
  • heterocyclylcarbonyl refers to a heterocyclyl group attached to the parent molecular moiety through a carbonyl group.
  • heterocyclyloxy refers to a heterocyclyl group attached to the parent molecular moiety through an oxygen atom.
  • heterocyclyloxycarbonyl refers to a heterocyclyloxy group attached to the parent molecular moiety through a carbonyl group.
  • hydroxy refers to —OH.
  • hydroxyalkyl refers to an alkyl group substituted with one, two, or three hydroxy groups.
  • hydroxyalkylcarbonyl refers to a hydroxyalkyl group attached to the parent molecular moiety through a carbonyl group.
  • nitro refers to —NO 2 .
  • R c and R d are independently selected from hydrogen, alkenyloxycarbonyl, alkoxyalkylcarbonyl, alkoxycarbonyl, alkyl, alkylcarbonyl, cycloalkyloxy, alkylsulfonyl, aryl, arylalkoxycarbonyl, arylalkyl, arylalkylcarbonyl, arylcarbonyl, aryloxycarbonyl, arylsulfonyl, cycloalkyl, cycloalkyloxycarbonyl, cycloalkylsulfonyl, formyl, haloalkoxycarbonyl, heterocyclyl, heterocyclylalkoxycarbonyl, heterocyclylalkyl, heterocyclylalkylcarbonyl, heterocyclylalkylcarbonyl, heterocyclylalkylcarbonyl, heterocyclylalkylcarbonyl, heterocyclylalkylcarbonyl, heterocyclylalky
  • R c and R d are as defined herein and each R q is independently hydrogen or C 1-3 alkyl.
  • (NR c R d )alkyl refers to an alkyl group substituted with one, two, or three —NR c R d groups.
  • the alkyl part of the (NR c R d )alkyl is further optionally substituted with one or two additional groups selected from alkoxy, alkoxyalkylcarbonyl, alkoxycarbonyl, alkylsulfanyl, C 2 alkynyl, arylalkoxycarbonyl, carboxy, cyano, cycloalkyl, halo, heterocyclyl, heterocyclylcarbonyl, hydroxy, and (NR e R f )carbonyl; wherein the heterocyclyl is further optionally substituted with one, two, three, four, or five substituents independently selected from alkoxy, alkyl, cyano, halo, haloalkoxy, haloalkyl, and nitro.
  • R e and R f refers to two groups, R e and R f , which are attached to the parent molecular moiety through a nitrogen atom.
  • R e and R f are independently selected from hydrogen, alkyl, unsubstituted aryl, unsubstituted arylalkyl, unsubstituted cycloalkyl, unsubstituted (cyclolalkyl)alkyl, unsubstituted heterocyclyl, unsubstituted heterocyclylalkyl, (NR x R y )alkyl, and (NR x R y )carbonyl.
  • (NR e R f )alkyl refers to an alkyl group substituted with one, two, or three —NR e R f groups.
  • (NR e R f )alkylcarbonyl refers to an (NR e R f )alkyl group attached to the parent molecular moiety through a carbonyl group.
  • (NR e R f )carbonyl refers to an —NR e R f group attached to the parent molecular moiety through a carbonyl group.
  • (NR e R f )sulfonyl refers to an —NR e R f group attached to the parent molecular moiety through a sulfonyl group.
  • —NR x R y refers to two groups, R x and R y , which are attached to the parent molecular moiety through a nitrogen atom.
  • R x and R y are independently selected from hydrogen, alkoxycarbonyl, alkyl, alkylcarbonyl, unsubstituted aryl, unsubstituted arylalkoxycarbonyl, unsubstituted arylalkyl, unsubstituted cycloalkyl, unsubstituted heterocyclyl, and (NR x′ R y′ )carbonyl, wherein R x′ and R y′ are independently selected from hydrogen and alkyl.
  • (NR x R y )alkyl refers to an alkyl group substituted with one, two, or three —NR x R y groups.
  • (NR x R y )carbonyl refers to an —NR x R y group attached to the parent molecular moiety through a carbonyl group.
  • —NR x R y refers to two groups, R x and R y , which are attached to the parent molecular moiety through a nitrogen atom.
  • R x and R y are independently selected from hydrogen and alkyl.
  • (NR x′ R y′ )carbonyl refers to an —NR x′ R y′ group attached to the parent molecular moiety through a carbonyl group.
  • oxo refers to ⁇ O.
  • sulfonyl refers to —SO 2 —.
  • Individual stereoisomers of compounds can be prepared synthetically from commercially available starting materials which contain chiral centers or by preparation of mixtures of stereoisomeric products followed by separation such as conversion to a mixture of diastereomers followed by separation or recrystallization, chromatographic techniques, or direct separation of stereoisomers 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 compounds of the present disclosure also exist as tautomers; therefore the present disclosure also encompasses all tautomeric forms.
  • isotopes include those atoms having the same atomic number but different mass numbers.
  • isotopes of hydrogen include deuterium and tritium.
  • isotopes of carbon include 13 C and 14 C.
  • 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.
  • pharmaceutically acceptable salt 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, methanesulfonate, naphthylenesulfonate, nicotinate, 2-naphthalenesulfonate, oxalate, palmoate, pectinate, persulfate, 3-phenylproprionate, picrate, pivalate, propionate, succinate, tartrate, trichloroacetate, trifluoroacetate, phosphate, glutamate, bicarbon
  • 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.
  • 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 amine cations such as ammonium, tetramethylammonium, tetraethylammonium, methylamine, 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.
  • compositions which include therapeutically effective amounts of compounds of Formula (I) or pharmaceutically acceptable salts thereof, and one or more pharmaceutically acceptable carriers, diluents, or excipients.
  • therapeutically effective amount 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.
  • 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.
  • 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 pharmaceutically acceptable carriers, diluents, or excipients.
  • pharmaceutically acceptable 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.
  • compositions 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.
  • mg/kg milligram per kilogram
  • 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.
  • 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.
  • 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.
  • 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.
  • compositions 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, intra-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.
  • compositions 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.
  • the active drug component can be combined with an oral, non-toxic pharmaceutically acceptable inert carrier such as ethanol, glycerol, water, and the like.
  • 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.
  • 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 carboxymethylcellulose, 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.
  • a binder such as carboxymethylcellulose, an aliginate, gelating, or polyvinyl pyrrolidone
  • a solution retardant such as paraffin
  • a resorption accelerator such as a quaternary salt and/or
  • 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.
  • a binder such as syrup, starch paste, acadia mucilage, or solutions of cellulosic or polymeric materials and forcing through a screen.
  • 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,
  • 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.
  • 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 phopholipids, such as cholesterol, stearylamine, or phophatidylcholines.
  • 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.
  • the compounds may be coupled to a class of biodegradable polymers useful in achieving controlled release of a drug, for example, polylactic acid, polepsilon caprolactone, polyhydroxy butyric acid, polyorthoesters, polyacetals, polydihydropyrans, polycyanoacrylates, and cross-linked or amphipathic block copolymers of hydrogels.
  • a class of biodegradable polymers useful in achieving controlled release of a drug, for example, polylactic acid, polepsilon caprolactone, polyhydroxy butyric acid, polyorthoesters, polyacetals, polydihydropyrans, polycyanoacrylates, and cross-linked or amphipathic block copolymers of hydrogels.
  • compositions 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.
  • the active ingredient may be delivered from the patch by iontophoresis as generally described in Pharmaceutical Research, 3(6):318 (1986).
  • compositions adapted for topical administration may be formulated as ointments, creams, suspensions, lotions, powders, solutions, pastes, gels, sprays, aerosols, or oils.
  • the formulations are preferably applied as a topical ointment or cream.
  • the active ingredient may be employed with either a paraffinic or a water-miscible ointment base.
  • the active ingredient may be formulated in a cream with an oil-in-water cream base or a water-in oil base.
  • compositions 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.
  • compositions adapted for topical administration in the mouth include lozenges, pastilles, and mouth washes.
  • compositions adapted for rectal administration may be presented as suppositories or as enemas.
  • compositions 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.
  • Fine particle dusts or mists which may be generated by means of various types of metered, dose pressurized aerosols, nebulizers, or insufflators.
  • compositions adapted for vaginal administration may be presented as pessaries, tampons, creams, gels, pastes, foams, or spray formulations.
  • compositions 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.
  • 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.
  • patient includes both human and other mammals.
  • 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 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-HCV activity compounds in combination therapy, either jointly or separately, or by combining the compounds into a composition.
  • 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.
  • 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.
  • Solvent A 0.1% TFA in 10% methanol/90% H 2 O
  • Solvent B 0.1% TFA in 90% methanol/10% H 2 O
  • Solvent A 0.1% TFA in 10% methanol/90% H 2 O
  • Solvent B 0.1% TFA in 90% methanol/10% H 2 O
  • Solvent A 0.1% TFA in 10% methanol/90% H 2 O
  • Solvent B 0.1% TFA in 90% methanol/10% H 2 O
  • Solvent A 0.1% TFA in 10% methanol/90% H 2 O
  • Solvent B 0.1% TFA in 90% methanol/10% H 2 O
  • Solvent A 0.1% TFA in 10% methanol/90% H 2 O
  • Solvent B 0.1% TFA in 90% methanol/10% H 2 O
  • Solvent A 0.1% TFA in 10% methanol/90% H 2 O
  • Solvent B 0.1% TFA in 90% methanol/10% H 2 O
  • Solvent A 0.1% TFA in 10% methanol/90% H 2 O
  • Solvent B 0.1% TFA in 90% methanol/10% H 2 O
  • Solvent A 0.1% TFA in 10% methanol/90% H 2 O
  • Solvent B 0.1% TFA in 90% methanol/10% H 2 O
  • Solvent A 0.1% TFA in 10% methanol/90% H 2 O
  • Solvent B 0.1% TFA in 90% methanol/10% H 2 O
  • 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.
  • Cap-8 and Cap-9 were conducted according to the synthesis of Cap-7 by using appropriate amines for the SN 2 displacement step (i.e., 4-hydroxypiperidine for Cap-8 and (S)-3-fluoropyrrolidine for Cap-9) and modified conditions for the separation of the respective stereoisomeric intermediates, as described below.
  • the stereoisomeric separation of the intermediate benzyl 2-(4-hydroxypiperidin-1-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 ⁇ 25 cm L, 10 ⁇ m) eluting with 80:20 heptane/ethanol at 10 mL/min, monitored at 220 nm, to provide 186.3 mg of stereoisomer-1 and 209.1 mg of stereoisomer-2 as light-yellow viscous oils.
  • the diastereomeric separation of the intermediate benzyl 2-((S)-3-fluoropyrrolidin-1-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 ⁇ 25 cm L, 5 ⁇ m) eluting with 95% CO 2 /5% methanol with 0.1% TFA, at 10 bar pressure, 70 mL/min flow rate, and a temperature of 35° C.
  • Cap-12 (Same as Cap-52)
  • Step 1 A mixture of (R)-( ⁇ )-D-phenylglycine tert-butyl ester (3.00 g, 12.3 mmol), NaBH 3 CN (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° C. 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.
  • 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 ⁇ 100 mm; CH 3 CN—H 2 O-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 ⁇ 6 g).
  • Step 1 (S)-1-Phenylethyl 2-bromo-2-phenylacetate.
  • ⁇ -bromophenylacetic acid 10.75 g, 0.050 mol
  • (S)-( ⁇ )-1-phenylethanol 7.94 g, 0.065 mol
  • DMAP 0.61 g, 5.0 mmol
  • solid EDCI (12.46 g, 0.065 mol) all at once.
  • Step 2 (S)-1-Phenylethyl (R)-2-(4-hydroxy-4-methylpiperidin-1-yl)-2-phenylacetate.
  • THF triethylamine
  • 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° C. (oil bath temperature) for 4 hours.
  • Step 3 (R)-2-(4-Hydroxy-4-methylpiperidin-1-yl)-2-phenylacetic acid.
  • (S)-1-phenylethyl (R)-2-(4-hydroxy-4-methylpiperidin-1-yl)-2-phenylacetate (0.185 g, 0.52 mmol) in dichloromethane (3 mL) was added trifluoroacetic acid (1 mL) and the mixture was stirred at room temperature for 2 hours.
  • Step 1 (S)-1-Phenylethyl 2-(2-fluorophenyl)acetate.
  • a mixture of 2-fluorophenylacetic acid (5.45 g, 35.4 mmol), (S)-1-phenylethanol (5.62 g, 46.0 mmol), EDCI (8.82 g, 46.0 mmol) and DMAP (0.561 g, 4.60 mmol) in CH 2 Cl 2 (100 mL) was stirred at room temperature for 12 hours. The solvent was then concentrated and the residue partitioned with H 2 O-ethyl acetate. The phases were separated and the aqueous layer back-extracted with ethyl acetate (2 ⁇ ).
  • Step 2 (R)—((S)-1-Phenylethyl) 2-(2-fluorophenyl)-2-(piperidin-1-yl)acetate.
  • Step 3 (R)-2-(2-Fluorophenyl)-2-(piperidin-1-yl)acetic acid.
  • a mixture of (R)—((S)-1-phenylethyl)2-(2-fluorophenyl)-2-(piperidin-1-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 (H 2 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%).
  • Step 1 (S)-1-Phenylethyl (R)-2-(4-hydroxy-4-phenylpiperidin-1-yl)-2-phenylacetate.
  • THF triethylamine
  • 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.
  • LC-MS Anal. Calcd. for: C 28 H 30 N 2 O 4 458.22; found: 459.44 (M + H) + .
  • LC-MS Anal. Calcd. for: C 21 H 26 N 2 O 2 338.20; found: 339.45 (M + H) + .
  • LC-MS Anal. Calcd. for: C 27 H 29 NO 2 399.22; found: 400.48 (M + H) + .
  • LC-MS Anal. Calcd. for: C 27 H 29 NO 2 399.22; found: 400.48 (M + H) + .
  • Step 1 (R,S)-Ethyl 2-(4-pyridyl)-2-bromoacetate.
  • DBU 0..99 mL, 6.66 mmol
  • CBr 4 2.21 g, 6.66 mmol
  • stirring was continued at ⁇ 78° C. for 2 hours.
  • the reaction mixture was then quenched with sat. aq. NH 4 Cl and the phases were separated.
  • Step 2 (R,S)-Ethyl 2-(4-pyridyl)-2-(N,N-dimethylamino)acetate.
  • DMF dimethylamine
  • Step 3 (R,S)-2-(4-Pyridyl)-2-(N,N-dimethylamino)acetic acid.
  • (R,S)-ethyl 2-(4-pyridyl)-2-(N,N-dimethylamino)acetate (0.200 g, 0.960 mmol) in a mixture of THF-methanol-H 2 O (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 1N HCl.
  • Cap-35 LC-MS Anal. Calcd. for C 12 H 13 NO 2 S: 235; found: 236 (M + H) + .
  • Cap-36 LC-MS Anal. Calcd. for C 12 H 14 N 2 O 2 S: 250; found: 251 (M + H) + .
  • Step 1 (R,S)-Ethyl 2-(quinolin-3-yl)-2-(N,N-dimethylamino)-acetate.
  • a mixture of ethyl N,N-dimethylaminoacetate (0.462 g, 3.54 mmol), K 3 PO 4 (1.90 g, 8.95 mmol), Pd(t-Bu 3 P) 2 (0.090 g, 0.176 mmol), 3-bromoquinoline and toluene (10 mL) was degassed with a stream of Ar bubbles for 15 minutes. The reaction mixture was then heated at 100° C. for 12 hours, after which it was cooled to room temperature and poured into H 2 O. The mixture was extracted with ethyl acetate (2 ⁇ ) and the combined organic phases were washed (H 2 O, brine), dried (Na 2 SO 4 ), filtered, and concentrated in vacuo.
  • Step 2 (R,S) 2-(Quinolin-3-yl)-2-(N,N-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° C. 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.
  • LC-MS Anal. Calcd. for C 13 H 14 N 2 O 2 : 230; found: 231 (M+H) + .
  • Step 1 (R)—((S)-1-Phenylethyl)2-(dimethylamino)-2-(2-fluorophenyl)acetate and (S)—((S)-1-Phenylethyl)2-(dimethylamino)-2-(2-fluorophenyl)acetate.
  • Step 2 (R)-2-(Dimethylamino)-2-(2-fluorophenyl)acetic acid.
  • a mixture of (R)—((S)-1-phenylethyl)2-(dimethylamino)-2-(2-fluorophenyl)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 (H 2 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%).
  • the S-isomer could be obtained from (S)—((S)-1-phenylethyl) 2-(dimethylamino)-2-(2-fluorophenyl)acetate TFA salt in similar fashion.
  • 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 CH 2 Cl 2 (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 H 2 O (5 mL) and the resulting precipitate was filtered, washed with H 2 O and n-hexanes, and dried under vacuum.
  • Step 1 (R)-tert-Butyl 2-(3,3-dimethylureido)-2-phenylacetate.
  • Step 2 (R)-2-(3,3-Dimethylureido)-2-phenylacetic acid.
  • TFA 15 mL
  • Step 1 (R)-tert-Butyl 2-(3-cyclopentylureido)-2-phenylacetate.
  • (R)-2-amino-2-phenylacetic acid hydrochloride 1.0 g, 4.10 mmol
  • Hunig's base 1.0 mL, 6.15 mmol
  • cyclopentyl isocyanate 0.46 mL, 4.10 mmol
  • Step 2 (R)-2-(3-Cyclopentylureido)-2-phenylacetic acid.
  • (R)-tert-butyl 2-(3-cyclopentylureido)-2-phenylacetate (1.31 g, 4.10 mmol) in CH 2 Cl 2 (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.
  • HPLC analytical conditions column, CHIRALPAK® AD-H (4.6 ⁇ 250 mm, 5 ⁇ m); solvent, 95% heptane/5% IPA (isocratic); flow rate, 1 mL/min; temperature, 35° C.; UV monitored at 205 nm.
  • Cap-51 could also be purchased from Flamm.
  • Cap-52 (Same as Cap-12)
  • 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(H 2 O/methanol/TFA) to afford Cap-52 as a colorless viscous oil.
  • 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.
  • Methyl chloroformate (0.65 mL, 8.39 mmol) was added dropwise over 5 min to a cooled (ice-water) mixture of Na 2 CO 3 (0.449 g, 4.23 mmol), NaOH (8.2 mL of 1M/H 2 O, 8.2 mmol) and (S)-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 CH 2 Cl 2 , and the aqueous phase was cooled with ice-water bath and acidified with concentrated HCl to a pH region of 1-2.
  • Cap-66 and Cap-67 were prepared from appropriate commercially available starting materials by employing the procedure described for the synthesis of Cap-65.
  • Methyl chloroformate (0.38 ml, 4.9 mmol) was added drop-wise to a mixture of 1N NaOH (aq) (9.0 ml, 9.0 mmol), 1M NaHCO 3 (aq) (9.0 ml, 9.0 mol), L-aspartic acid ⁇ -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 ⁇ ).
  • the aqueous layer was acidified with 12N HCl to a pH ⁇ 1-2, and extracted with ethyl acetate (3 ⁇ 50 ml).
  • NaCNBH 3 (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.
  • Cap-70 to Cap-74x were prepared according to the procedure described for the synthesis of Cap-69 by employing appropriate starting materials.
  • LC- MS Anal. Calcd. for [M + H] + C 9 H 20 NO 2 : 174.15; found 174.13.
  • LC-MS Anal. Calcd. for [M + H] + C 8 H 18 NO 2 : 160.13; found 160.06.
  • Methyl chloroformate (0.36 mL, 4.65 mmol) was added drop-wise over 11 min to a cooled (ice-water) mixture of Na 2 CO 3 (0.243 g, 2.29 mmol), NaOH (4.6 mL of 1M/H 2 O, 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 CH 2 Cl 2 (30 mL, 2 ⁇ ), and the aqueous phase was cooled with ice-water bath and acidified with concentrated HCl to a pH region of 2.
  • Cap-77 was conducted according to the procedure described for Cap-7 by using 7-azabicyclo[2.2.1]heptane for the SN 2 displacement step, and by effecting the stereoisomeric 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 ⁇ 250 mm, 5 um) eluting with 90% CO 2 -10% EtOH at 70 mL/min, and a temperature of 35° C. to provide 124.5 mg of stereoisomer-1 and 133.8 mg of stereoisomer-2.
  • a chiral HPLC column Chiracel AD-H column, 30 ⁇ 250 mm, 5 um
  • NaCNBH 3 (0.5828 g, 9.27 mmol) was added to a mixture of the HCl salt of (R)-2-(ethylamino)-2-phenylacetic acid (an intermediate in the synthesis of Cap-3; 0.9923 mg, 4.60 mmol) and (1-ethoxycyclopropoxy)trimethylsilane (1.640 g, 9.40 mmol) in MeOH (10 mL), and the semi-heterogeneous mixture was heated at 50° C. with an oil bath for 20 hr.
  • LiHMDS (9.2 mL of 1.0 M/THF, 9.2 mmol) was added drop-wise over 10 min to a cooled ( ⁇ 78° C.) THF (50 mL) solution of (S)-1-benzyl 4-methyl 2-(9-phenyl-9H-fluoren-9-ylamino)succinate (3.907 g, 8.18 mmol) and stirred for ⁇ 1 hr.
  • Met (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.
  • a balloon of hydrogen was attached to a mixture of (2S,3S)-benzyl 4-(tert-butyldimethylsilyloxy)-3-methyl-2-(9-phenyl-9H-fluoren-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 H 2 as necessary.
  • reaction mixture was diluted with CH 2 Cl 2 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).
  • EtOAc 200 mL
  • EtOAc/MeOH 1:1 mixture, 200 mL
  • 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/1-PrOH/H 2 O) to afford (2S,3S)-2-amino-4-(tert-butyldimethylsilyloxy)-3-methylbutanoic acid as a white fluffy solid (325 mg).
  • 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 stereoisomers (i.e., Cap-4, Cap-13, Cap-51 and Cap-52, respectively).
  • 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 H 2 O (200 mL), MeOH (200 mL), and then NH 3 (3M in MeOH, 2 ⁇ 200 mL).
  • the appropriate fractions was concentrated in vacuo and the residue (ca. 1.1 g) was dissolved in H 2 O, frozen and lyophyllized.
  • the title compound was obtained as a foam (1.02 g, 62%).
  • 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. LC-MS: Anal. Calcd. for C 11 H 15 NO 2 : 193; found: 192 (M ⁇ H) ⁇ .
  • Cap-106 Prepared from cis-4- aminocyclohexane carboxylic acid and acetaldehyde by employing a similar procedure described for the synthesis of Cap-2.
  • the crude HCl salt was passed through MCX (MeOH/H 2 O/CH 2 Cl 2 wash; 2 N NH 3 /MeOH elution) to afford an oil, which was dissolved in CH 3 CN/H 2 O and lyophilized to afford a tan solid.
  • Cap-122 1 H NMR profile is similar to that of its stereoisomer, Cap-121.
  • the hydrochloride salt of L-threonine tert-butyl ester was carbamoylated according to the procedure for Cap-51.
  • the crude reaction mixture was acidified with 1N HCl to pH-1 and the mixture was extracted with EtOAc (2 ⁇ 50 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—CH 2 Cl 2 -MeOH (1:1:0.1) and then the organic phase concentrated in vacuo to give a colorless oil which was shown by LC-MS to be the desired product. Both crops were combined to give 0.52 g of a solid.
  • Cap-127 was prepared according to the method for Cap-126 above starting from (S)-2-amino-3-(1-methyl-1H-imidazol-4-yl)propanoic acid (1.11 g, 6.56 mmol), NaHCO 3 (1.21 g, 14.4 mmol) and ClCO 2 Me (0.56 mL, 7.28 mmol). The title compound was obtained as its HCl salt (1.79 g, >100%) contaminated with inorganic salts. LC-MS and 1 H NMR showed the presence of ca. 5% of the methyl ester. The crude mixture was used as is without further purification.
  • 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).
  • 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 4 ), filtered, and concentrated under reduced pressure.
  • Step b To an 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 N 2 (3 ⁇ ) and placed under 1 atm of H 2 . 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.
  • Cap-132 was prepared from (S)-benzyl 2-aminopropanoate hydrochloride according to the method described for Cap-131.
  • LC (Cond. 1): RT 0.15 min; MS: Anal. Calcd. for [M+H] + C 6 H 13 N 2 O 3 : 161.09; found 161.00.
  • 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.
  • Cap-134 was prepared from (S)-diethyl alanine and methyl chloroformate according to the method described for Cap-51.
  • LC (Cond. 2): RT 0.66 min; LC-MS: Anal. Calcd. for [M+H] + C 9 H 18 NO 4 : 204.12; found 204.02.
  • step a 110 mg, 0.50 mmol 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). The mixture was stirred at 25° C. 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 over Na 2 SO 4 , filtered and concentrated.
  • step a (2.34 g, 14.7 mmol) in anhydrous dichloromethane (50 mL) at room temperature was added meta-chloroperbenzoic acid (77%, 3.42 g, 19.8 mmol) in one portion.
  • 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%).
  • step b To a stirred solution of Cap-138, step b (0.70 g, 4.00 mmol) and triethylamine (1.1 mL, 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 at 75° C. 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 over Na 2 SO 4 and solvent concentration.
  • 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 at 85° C. for 4 h, cooled to 25° C., diluted with dichloromethane and acidified with 1N hydrochloric acid. The organic phase was separated, washed with brine, dried over Na 2 SO 4 , concentrated to 1 ⁇ 4 volume and filtered to afford Cap-138 as a yellow solid (0.44 g, 88.9%).
  • Cap-139 was prepared from the basic hydrolysis of Cap-139, step a with 5N NaOH according to the procedure described for Cap-138.
  • Cap-140 was prepared by the acid hydrolysis of Cap-140, step a with 12N HCl as described in the procedure for the preparation of Cap-141, described below.
  • R t 2.24 min (Cond.-MS-W2); 90% homogenity index;
  • Cap-141 step a was prepared from 1-bromo-3-fluoroisoquinoline (prepared from 3-amino-1-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 supra).
  • Cap-141 step a (83 mg, 0.48 mmol) was treated with 12N HCl (3 mL) and the resulting slurry was heated at 80° C. for 16 h before it was cooled to room temperature and diluted with water (3 mL). 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 over Na 2 SO 4 , and concentrated to afford additional Cap-141 which was sufficiently pure to be carried forward directly (29.30 mg, 31.8%).
  • 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.
  • R t 1.45 min (Cond.-MS-W1); 90% homogenity index;
  • 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 mmol) in anhydrous toluene (1 mL) was added morpholine (61 ⁇ L, 0.70 mmol). The mixture was heated at 100° C. for 16 h, cooled to 25° C. and filtered through diatomaceous earth (CELITE®).
  • CELITE® diatomaceous earth
  • Cap-142 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.
  • R t 1.26 min (Cond.-MS-W1); 90% homogenity index;
  • Cap-142 was prepared from Cap-142, step b with 5N sodium hydroxide as described in the procedure for Cap-138.
  • R t 0.72 min (Cond.-MS-W1); 90% homogenity index;
  • step a 154 mg, 0.527 mmol
  • anhydrous tetrahydrofuran 5 mL
  • n-butyllithium in hexanes 2.5 M, 0.25 mL, 0.633 mmol
  • dry carbon dioxide was bubbled into the reaction mixture for 10 min before it was quenched with 1N HCl and allowed to warm to 25° C.
  • the mixture was then extracted with dichloromethane (3 ⁇ 30 mL) and the combined organic extracts were concentrated in vacuo. Purification of the residue by a reverse phase HPLC (MeOH/water/TFA) afforded Cap-143 (16 mg, 12%).
  • R t 1.10 min (Cond.-MS-W1); 90% homogenity index; LC-MS: Anal. Calc. for [M+H] + C 14 H 15 N 2 O 3 : 259.11; found: 259.08.
  • step a (0.30 g, 1.23 mmol) was taken up in methanol (60 mL) and treated with platinum oxide (30 mg), and the suspension was subjected to Parr hydrogenation at 7 psi H 2 for 1.5 h. Then formalin (5 mL) and additional platinum oxide (30 mg) were added, and the suspension was resubjected to Parr hydrogenation at 45 psi H 2 for 13 h. It was then suction-filtered through diatomaceous earth (CELITE®) and concentrated down to 1 ⁇ 4 volume.
  • CELITE® diatomaceous earth
  • Cap-144, step c was prepared from Cap-144, step b according to the procedure described for the preparation of Cap-139, step a.
  • R t 2.19 min (Cond.-D1); 95% homogenity index;
  • LC-MS Anal. Calc. for [M+H] + C 12 H 11 ClN 3 : 232.06; found: 232.03.
  • HRMS Anal. Calc. for [M+H] + C 12 H 11 ClN 3 : 232.0642; found: 232.0631.
  • Cap-145 to Cap-162 were prepared from the appropriate 1-chloroisoquinolines according to the procedure described for the preparation of Cap-138 (Method A) or Cap-139 (Method B) unless noted otherwise as outlined below.
  • Cap-147 Prepared from commercially available 1-chloro-4- hydroxyisoquinoline B 5N NaOH 0.87 min (Cond.- D1); 95%; LC- MS: Anal. Calc. for [M + H] + C 11 H 10 NO 3 : 204.07; found: 204.05.
  • Cap-148 Prepared from commercially available 7-hydroxyisoquinoline A 5N NaOH 0.70 min (Cond.- D1); 95%; LC- MS: Anal. Calc. for [M + H] + C 11 H 10 NO 3 : 204.07; found: 204.05.
  • Cap-149 Prepared from commercially available 5-hydroxyisoquinoline A 5N NaOH 0.70 min (Cond.- D1); 95%; LC- MS: Anal. Calc.
  • Cap-151 3-chloro-5- methoxyisoquinoline- 1-carboxylic acid Prepared from 5- methoxy-1,3- dichloroisoquinoline, which can be synthesized following the procedure in WO 2005/051410 B 12N HCl 1.78 min (Cond.- D1); 90%; LC- MS: Anal. Calc. for [M + H] + C 11 H 9 ClNO 3 : 238.03; found: 238.09.
  • Cap-152 Prepared from commercially available 6-methoxy-1,3- dichloroisoquinoline B 12N HCl 1.65 min (Cond.- D1); 95%; LC- MS: Anal. Calc.
  • Cap-155 Prepared from 1,7- dichloroisoquinoline, which can be synthesized following the procedure in WO 2003/099274 B 5N NaOH 0.59 min (Cond.- MS-W1); 90%; LC-MS: Anal. Calc. for [M + H] + C 10 H 7 ClNO 2 : 208.02; found: 208.00.
  • Cap-156 Prepared from 1,6- dichloroisoquinoline, which can be synthesized following the procedure in WO 2003/099274 B 5N NaOH 0.60 min (Cond.- MS-W1); 90%; LC-MS: Anal. Calc.
  • Cap-157 Prepared from 1,4- dichloroisoquinoline, which can be synthesized following the procedure in WO 2003/062241 B 12N HCl 1.49 min (Cond.- D1); 95%; LC- MS: Anal. Calc. for [M + H] + C 10 H 17 ClNO: 208.02; found: 208.00.
  • Cap-158 Prepared from 1,5- dichloroisoquinoline, which can be synthesized following the procedure in WO 2003/099274 B 5N NaOH 0.69 min (Cond.- MS-W1); 90%; LC-MS: Anal. Calc.
  • Cap-159 Prepared from 5-fluoro- 1-chloroisoquinoline, which can be synthesized following the procedure in WO 2003/099274 B 5N NaOH 0.41 min (Cond.- MS-W1); 90%; LC-MS: Anal. Calc. for [M + H] + C 10 H 7 FNO 2 : 192.05; found: 192.03.
  • Cap-160 Prepared from 6-fluoro- 1-chloroisoquinoline, which can be synthesized following the procedure in WO 2003/099274 B 5N NaOH 0.30 min (Cond.- MS-W1); 90%; LC-MS: Anal. Calc.
  • Cap-161 Prepared from 4- bromoquinoline-2- carboxylic acid and dimethylamine (DMSO, 100° C.) — -— 0.70 min (Cond. D1); 95%; LC- MS: Anal. Calc. for [M + H] + C 12 H 13 N 2 O 2 : 217.10; found: 217.06.
  • Cap-162 Prepared from m- anisidine following the procedure described in J. Hetero. Chem. , 17 (1993) and Heterocycles , 60:953 (2003). — — 0.65 min (Cond.- M3); 95%; LC- MS: Anal. Calc. for [M + H] + C 11 H 10 NO 3 : 204.07; found: 203.94.
  • Cap-166a and Cap-166b were prepared from (1S,4S)-(+)-2-methyl-2,5-diazabicyclo[2.2.1]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 ⁇ 250 mm, 10 ⁇ m eluting with 85:15 heptane/ethanol mixture at 10 mL/min elution rate for 25 min.
  • Racemic Cap-168 was prepared from racemic Boc-aminoindane-1-carboxylic acid according to the procedure described for the preparation of Cap-167. The crude material was employed as such.
  • Triflic anhydride (5.0 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 CH 2 Cl 2 (80 mL). The mixture was stirred at 0° C. for 1 h before it was allowed to warm up to room temperature where it stirred for an additional 1 h.
  • Ester Cap-176, step b was prepared from alkene Cap-176, step a according to the method of Burk, M. J. et al. ( J. Am. Chem. Soc., 117:9375-9376 (1995)) 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 of N 2 .
  • Methyl chloroformate (260.495 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 CH 2 Cl 2 (100 mL). The resulting solution was stirred at rt for 3 h and volatiles were removed under reduced pressure. The residue was purified via BIOTAGE® (0% to 20% EtOAc/Hex; 90 g column). A clear oil that solidified upon standing under vacuum and corresponding to carbamate Cap-176, step f (2.22 g) was recovered.
  • 1,1,3,3-Tetramethylguanidine (0.985 mL, 7.85 mmol) was added to a stirred solution of methyl 2-(benzyloxycarbonylamino)-2-(dimethoxyphosphoryl)acetate (2.0 g, 6.0 mmol) in EtOAc (40 mL) and the mixture was stirred at rt under N 2 for 10 min. Then dihydro-2H-pyran-3(4H)-one [23462-75-1] (0.604 g, 6.04 mmol) was added and the mixture was stirred at rt for 16 h. The reaction mixture was then cooled in freezer for 10 min and neutralized with aq. citric acid (1.5 g in 20 mL water).
  • the two phases were partitioned and the organic layer was washed with 0.25 N aq.HCl and brine, and then dried (MgSO 4 ) and concentrated to a colorless oil.
  • the crude material was purified by flash silica chromatography (loading solvent: DCM, eluted with EtOAc/Hexanes, gradient from 20% to 30% EtOAc) to yield two isomeric products:
  • the first eluted product was (Z)-methyl 2-(benzyloxycarbonylamino)-2-(2H-pyran-3(4H,5H,6H)-ylidene)acetate (490 mg) (white solid), and the second was (E)-methyl 2-(benzyloxycarbonylamino)-2-(2H-pyran-3(4H,5H,6H)-ylidene)acetate (433 mg) (white solid).
  • LC-MS retention time 1.398 min (for Z-isomer) and 1.378 min (for E-isomer); m/z 304.08 (for Z-isomer) and 304.16 (for E-isomer) (MH ⁇ ).
  • LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a PHENOMENEX® Luna 10u C18 3.0 ⁇ 50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM.
  • the elution conditions employed a flow rate of 4 mL/min, a gradient of 100% Solvent A/0% Solvent B to 0% Solvent A/100% Solvent B, a gradient time of 3 min, a hold time of 1 min, and an analysis time of 4 min where Solvent A was 5% MeOH/95% H 2 O/10 mM ammonium acetate and Solvent B was 5% H 2 O/95% MeOH/10 mM ammonium acetate.
  • MS data was determined using a MICROMASS® Platform for LC in electrospray mode. 1 H NMR (400 MHz, chloroform-d) (for Z-isomer) ⁇ ppm 7.30-7.44 (m, 5H), 6.18 (br.
  • the elution conditions employed a flow rate of 4 mL/min, a gradient of 100% Solvent A/0% Solvent B to 0% Solvent A/100% Solvent B, a gradient time of 3 min, a hold time of 1 min, and an analysis time of 4 min where Solvent A was 5% MeOH/95% H 2 O/10 mM ammonium acetate and Solvent B was 5% H 2 O/95% MeOH/10 mM ammonium acetate.
  • MS data was determined using a MICROMASS® Platform for LC in electrospray mode.
  • LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a PHENOMENEX® Luna 10u C18 3.0 ⁇ 50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM.
  • the elution conditions employed a flow rate of 4 mL/min, a gradient of 100% Solvent A/0% Solvent B to 0% Solvent A/100% Solvent B, a gradient time of 3 min, a hold time of 1 min, and an analysis time of 4 min where Solvent A was 5% MeOH/95% H 2 O/10 mM ammonium acetate and Solvent B was 5% H 2 O/95% MeOH/10 mM ammonium acetate.
  • LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a PHENOMENEX® Luna 10u C18 3.0 ⁇ 50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM.
  • the elution conditions employed a flow rate of 4 mL/min, a gradient of 100% Solvent A/0% Solvent B to 0% Solvent A/100% Solvent B, a gradient time of 3 min, a hold time of 1 min, and an analysis time of 4 min where Solvent A was 5% MeOH/95% H 2 O/10 mM ammonium acetate and Solvent B was 5% H 2 O/95% MeOH/10 mM ammonium acetate.
  • step a 5.0 g, 23 mmol
  • sodium methoxide 0.1 mL, 23.12 mmol
  • the solvent was then removed under vacuum. The residue was diluted with benzene and concentrated to afford the corresponding diol as a yellow solid.
  • step c To a mixture of Cap-178, step c (3.13 g, 9.59 mmol) and AIBN (120 mg, 0.731 mmol) in 40 mL of benzene at 80° C. was added tri-n-butyltin hydride (10.24 mL, 38.4 mmol). The resulting mixture was stirred at reflux temperature for 20 min then cooled to room temperature. The mixture was diluted with diethyl ether and 100 mL of KF (10 g) aqueous solution was added and the mixture was stirred vigorously for 30 min. The two layers were then separated and the aqueous phase was extracted with EtOAc (2 ⁇ ). The organic layer was dried with MgSO 4 and concentrated.
  • step d To a mixture of Cap-178, step d (1.9 g, 8.63 mmol) in 10 mL of MeOH was added sodium methoxide (2 mL, 4.00 mmol) (2 M in methanol). The resulting mixture was stirred at room temperature for 5 hours. The solvent was removed under vacuum. The mixture was neutralized with saturated NH 4 Cl solution and extracted with EtOAc (3 ⁇ ). The organic layers were dried with MgSO 4 and concentrated to afford Cap-178, step e (0.8 g) as clear oil. The product was used in the next step without further purification.
  • step f 1.6 g, 5.92 mmol
  • 10 mL of toluene was added.
  • the tube was sealed and LiHMDS (7.1 mL, 7.10 mmol) (1 N in toluene) was added dropwise under N 2 .
  • the resulting dark brown solution was heated at 100° C. under microwave radiation for 6 hours.
  • To the mixture was then added water and the mixture was extracted with EtOAc (3 ⁇ ).

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