Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
  • C07K5/04—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
  • C07K5/06—Dipeptides
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
  • C07K5/04—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
  • C07K5/08—Tripeptides
  • C07K5/0802—Tripeptides with the first amino acid being neutral
  • C07K5/0804—Tripeptides with the first amino acid being neutral and aliphatic
• • 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
• • 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
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
  • C07K5/02—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing at least one abnormal peptide link
  • C07K5/0202—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing at least one abnormal peptide link containing the structure -NH-X-X-C(=0)-, X being an optionally substituted carbon atom or a heteroatom, e.g. beta-amino acids
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
  • C07K5/04—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
  • C07K5/08—Tripeptides
  • C07K5/0802—Tripeptides with the first amino acid being neutral
  • C07K5/0812—Tripeptides with the first amino acid being neutral and aromatic or cycloaliphatic
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
  • C07K5/04—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
  • C07K5/08—Tripeptides
  • C07K5/0827—Tripeptides containing heteroatoms different from O, S, or N
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
  • C07K7/02—Linear peptides containing at least one abnormal peptide link
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K38/00—Medicinal preparations containing peptides

Definitions

• Novel Peptides as NS3-Serine Protease Inhibitors of Hepatitis C Virus
• the present invention relates to novel hepatitis C virus ("HCV”) protease inhibitors, pharmaceutical compositions containing one or more such inhibitors, methods of preparing such inhibitors and methods of using such inhibitors to treat hepatitis C and related disorders.
• HCV hepatitis C virus
• This invention specifically discloses novel peptide compounds as inhibitors of the HCV NS3/NS4a serine protease.
• Priority for the invention is based on U.S. patent applications Serial Number 60/220,108 filed July 21, 2000, and Serial Number 09/908,955 filed July 19, 2001.
• Hepatitis C virus is a (+)-sense single-stranded RNA virus that has been implicated as the major causative agent in non-A, non-B hepatitis (NANBH), particularly in blood-associated NANBH (BB-NANBH)(see, International Patent Application Publication No. WO 89/04669 and European Patent Application Publication No. EP 381 216).
• NANBH is to be distinguished from other types of viral-induced liver disease, such as hepatitis A virus (HAV), hepatitis B virus (HBV), delta hepatitis virus (HDV), cytomegalovirus (CMV) and Epstein-Barr virus (EBV), as well as from other forms of liver disease such as alcoholism and primary biliar cirrhosis.
• HAV hepatitis A virus
• HBV hepatitis B virus
• HDV delta hepatitis virus
• CMV cytomegalovirus
• EBV Epstein-Barr virus
• HCV protease necessary for polypeptide processing and viral replication has been identified, cloned and expressed; (see, e.g., U.S. Patent No. 5,712,145).
• This approximately 3000 amino acid polyprotein contains, from the amino terminus to the carboxy terminus, a nucleocapsid protein (C), envelope proteins (E1 and E2) and several non-structural proteins (NS1 , 2, 3, 4a, 5a and 5b).
• NS3 is an approximately 68 kda protein, encoded by approximately 1893 nucleotides of the HCV genome, and has two distinct domains: (a) a serine protease domain consisting of approximately 200 of the N-terminal amino acids; and (b) an RNA-dependent ATPase domain at the C-terminus of the protein.
• the NS3 protease is considered a member of the chymotrypsin family because of similarities in protein sequence, overall three-dimensional structure and mechanism of catalysis.
• Other chymotrypsin-like enzymes are elastase, factor Xa, thrombin, trypsin, plasmin, urokinase, tPA and PSA.
• the HCV NS3 serine protease is responsible for proteolysis of the polypeptide (polyprotein) at the NS3/NS4a, NS4a/NS4b, NS4b/NS5a and NS5a/NS5b junctions and is thus responsible for generating four viral proteins during viral replication. This has made the HCV NS3 serine protease an attractive target for antiviral chemotherapy.
• the NS4a protein an approximately 6 kda polypeptide, is a co-factor for the serine protease activity of NS3.
• Autocleavage of the NS3/NS4a junction by the NS3/NS4a serine protease occurs intramolecularly (Le., cis) while the other cleavage sites are processed intermoleculariy (i.e., trans).
• Analysis of the natural cleavage sites for HCV protease revealed the presence of cysteine at P1 and serine at P1' and that these residues are strictly conserved in the NS4a/NS4b, NS4b/NS5a and NS5a/NS5b junctions.
• the NS3/NS4a junction contains a threonine at P1 and a serine at P1'.
• the Cys ⁇ Thr substitution at NS3/NS4a is postulated to account for the requirement of cis rather than trans processing at this junction. See, e.g.. Pizzi et ai. (1994) Proc. Natl. Acad. Sci (USA) _91_:888-892, Failla et ai. (1996) Folding & Design 1:35-42.
• the NS3/NS4a cleavage site is also more tolerant of mutagenesis than the other sites. See, e ⁇ , Kollykhalov et ai. (1994) J. Virol. 68:7525-7533. It has also been found that acidic residues in the region upstream of the cleavage site are required for efficient cleavage. See, e ⁇ Komoda et ai. (1994) J. Virol. 68:7351-
• Inhibitors of HCV protease include antioxidants (see, International Patent Application Publication No. WO 98/14181), certain peptides and peptide analogs (see, International Patent Application Publication No. WO 98/17679, Landro et ai. (1997) Biochem. 36:9340-9348, Ingallinella et ai. (1998) Biochem. 37:8906-8914. Llinas-Brunet et al. (1998) Bioorg. Med. Chem. Lett. 8:1713-1718). inhibitors based on the 70-amino acid polypeptide eglin c (Martin et ai. (1998) Biochem.
• HCV has been implicated in cirrhosis of the liver and in induction of hepatocellular carcinoma.
• the prognosis for patients suffering from HCV infection is currently poor.
• HCV infection is more difficult to treat than other forms of hepatitis due to the lack of immunity or remission associated with HCV infection.
• Current data indicates a less than 50% survival rate at four years post cirrhosis diagnosis.
• Patients diagnosed with localized resectable hepatocellular carcinoma have a five-year survival rate of 10-30%, whereas those with localized unresectable hepatocellular carcinoma have a five-year survival rate of less than 1%.
• a still further object of the present invention is to provide methods for modulating the activity of serine proteases, particularly the HCV NS3/NS4a serine protease, using the compounds provided herein.
• Another object herein is to provide methods of modulating the processing of the HCV polypeptide using the compounds provided herein.
• the present invention provides a novel class of inhibitors of the HCV protease, pharmaceutical compositions containing one or more of the compounds, methods of preparing pharmaceutical formulations comprising one or more such compounds, and methods of treatment, prevention or amelioration or one or more of the symptoms of hepatitis C. Also provided are methods of modulating the interaction of an HCV polypeptide with HCV protease. Among the compounds provided herein, compounds that inhibit HCV NS3/NS4a serine protease activity are preferred.
• the present application discloses a , compound, or enantiomers, stereoisomers, rotamers, tautomers, racemates or prodrug of said compound, or pharmaceutically acceptable salts or solvates of said compound, or of said prodrug, said compound having the general structure shown in Formula I:
• Y is selected from the group consisting of alkyl, alkyl-aryl, heteroalkyl, heteroaryl, aryl-heteroaryl, alkyl-heteroaryl, cycloalkyl, alkyloxy, alkyl-aryloxy, aryloxy, heteroaryloxy, heterocycloalkyloxy, cycloalkyloxy, alkylamino, arylamino, alkyl- arylamino, arylamino, heteroarylamino, cycloalkylamino and heterocycloalkylamino, with the proviso that Y maybe optionally substituted with
• X 11 is alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkyl-alkyl, heterocyclyl, heterocyclylalkyl, aryl, alkylaryl, arylalkyl, heteroaryl, alkylheteroaryl, or
• X 12 is hydroxy, alkoxy, aryloxy, thio, alkylthio, arylthio, amino, alkylamino, arylamino, alkylsulfonyl, arylsulfonyl, alkylsulfonamido, arylsulfonamido, carboxy, carbalkoxy, carboxamido, alkoxycarbonylamino, alkoxycarbonyloxy, alkylureido, arylureido, halogen, cyano, or nitro, with the proviso that said alkyl, alkoxy, and aryl may be additionally optionally substituted with moieties independently selected from X 12 ;
• R 1 is -C(0)R 5 or -B(OR) 2 , wherein R 5 is H, -OH, -OR 8 , -NR 9 R 10 , -CF 3 , -C 2 F 5 ,
• R 7 is H, -OH, -OR 8 , -CHR 9 R 10 , or -NR 9 R 10
• R 6 , R 8 , R 9 and R 10 are independently selected from the group consisting of H, alkyl, aryl, heteroalkyl, heteroaryl, cycloalkyl, cycloalkyl, arylalkyl, heteroarylalkyl, -[CH(R )] p C(0)OR 11 , - [CH(R )]pC(0)NR 12 R 13 , -[CH(R )]pS(0 2 )R 11 , -[CH(R )] p C(0)R 11 , -[CH(R )] p CH(OH)R 11 , -CH(R )C(0)N(H)CH(R 2' )C(0)OR 11 , -CHCH(R )C(0)N(H)CH(R 2' )C(0)OR 11 , -CHCH(R )
• R 1' )C(O)N(H)CH(R 2' )C(O)N(H)CH(R 3' )C(O)N(H)CH(R 4' )C(O)N(H)CH(R 5' ) C(O)NR 12 R 13 wherein R , R 2' , R 3' , R 4' , R 5' , R 11 , R 12 , R 13 , and R" are independently selected from the group consisting of H, alkyl, aryl, heteroalkyl, heteroaryl, cycloalkyl, alkyl-aryl, alkyl-heteroaryl, aryl-alkyl and heteroaralkyl; Z is selected from O, N, C(H) or C(R);
• Q maybe present or absent, and when Q is present, Q is C(H), N, P, (CH 2 ) P , (CHR)p , (CRR')p , O, NR, S, or S0 2 ; and when Q is absent, M may be present or absent; when Q and M are absent, A is directly linked to L; A is O, CH 2 , (CHR)p , (CHR-CHR') P , (CRR') P , N(R), S, S(0 2 ) or a bond; E is CH, N, CR, or a double bond towards A, L or G;
• G may be present or absent, and when G is present, G is (CH 2 ) P , (CHR) P , or
• (CRR') P when G is absent, J is present and E is directly connected to the carbon atom in Formula I as G is linked to; J maybe present or absent, and when J is present, J is (CH 2 ) P , (CHR) P , or (CRR') P , S(0 2 ), N(H), N(R) or O; and when J is absent, G is present and E is directly linked to N shown in Formula I as linked to J; L may be present or absent, and when L is present, L is C(H), C(R), O, S or N(R); and when L is absent, then M may be present or absent; and if M is present with L being absent, then M is directly and independently linked to E, and J is directly and independently linked to E;
• M may be present or absent, and when M is present, M is O, NR, S, S(0 2 ), (CH 2 ) P , (CHR) p (CHR-CHR') P , or (CRR') P ; p is a number from 0 to 6; and
• R, R', R 2 , R 3 and R 4 can be the same or different and are independently from the group consisting of H; C 1 -C 10 alkyl; C 2 -C ⁇ 0 alkenyl; C 3 -C 8 cycloalkyl; C 3 -C 8 heterocycloalkyl, alkoxy, aryloxy, alkylthio, arylthio, amino, amido, ester, carboxylic acid, carbamate, urea, ketone, aldehyde, cyano, nitro, halogen; (cycloalkyl)alkyl and (heterocycloalkyl)alkyl, wherein said cycloalkyl is made of three to eight carbon atoms, and zero to six oxygen, nitrogen, sulfur, or phosphorus atoms, and said alkyl is of one to six carbon atoms; aryl; heteroaryl; alkyl-aryl; and alkyl-heteroaryl;
• alkyl, heteroalkyl, alkenyl, heteroalkenyl, aryl, heteroaryl, cycloalkyl and heterocycloalkyl moieties may be optionally and chemically-suitably substituted, with said term "substituted” referring to optional and chemically- suitable substitution with one or more moieties selected from the group consisting of alkyl, alkenyl, alkynyl, aryl, aralkyl, cycloalkyl, heterocyclic, halogen, hydroxy, thio, alkoxy, aryloxy, alkylthio, arylthio, amino, amido, ester, carboxylic acid, carbamate, urea, ketone, aldehyde, cyano, nitro, sulfonamido, sulfoxide, sulfone, sulfonyl urea, hydrazide, and hydroxamate; further wherein said unit N-C-G-
• R 1 is -C(0)R 5 with R 5 being H, -OH, -C(0)OR 8 or -C(0)NR 9 R 10 , where R 8 , R 9 and R 10 are defined above.
• R 1 is -C(0)C(0)NR 9 R 10 , where R 9 is H; and R 10 is H, -R 14 , -[CH(R 1' )] p C(0)OR 11 , -[CH(R 1' )] p C(0)NR 12 R 13 , -[CH(R 1' )] p S(0 2 )R 11 , -[CH(R )] p S(0 2 )NR 12 R 13 , -[CH(R 1' )] p C(0)R 11 , -CH(R 1' )C(0)N(H)CH(R 2' )C(0)OR 11 , -CH(R 1' )C(0)N(H)CH(R 2' )C(0)NR 12 R 13 , or -CH(R r )C(0)N(H)CH(R 2' )(R'), wherein R 14 is H, alkyl, aryl, heteroalkyl, heteroaryl, cyclo
• R preferred moieties for R are: H, -R 14 ,
• R 1' is H or alkyl
• R 2' is phenyl, substituted phenyl, hetero atom-substituted phenyl, thiophenyl, cycloalkyl, piperidyl or pyridyl.
• R is H
• R is H, methyl, ethyl, allyl, tert- butyl, benzyl, ⁇ -methylbenzyl, , ⁇ -dimethylbenzyl, 1 -methylcyclopropyl or 1- methylcyclopentyl
• R' is hydroxymethyl or -CH 2 C(0)NR 12 R 13
• NR 12 R 13 is selected from the group consisting of:
• U 6 is H, OH, or CH 2 OH
• R 14 is preferably selected from the group consisting of: H, Me, Et, n-propyl, methoxy, cyclopropyl, n-butyl, 1-but-3-ynyl, benzyl, ⁇ -methyl benzyl, phenethyl, allyl, 1-but-3-enyl, OMe and cyclopropyl methyl;
• R is preferably independently selected from the group consisting of:
• U 1 and U 2 maybe same or different and are selected from the group consisting of H, F, CH 2 COOH, CH 2 COOMe, CH 2 CONH 2 , CH . CONHMe, CH 2 CONMe 2 , azido, amino, hydroxyl, substituted amino and substituted hydroxyl;
• U 3 and U 4 maybe same or different and are selected from O and S;
• U 5 is selected from the moieties consisting of alkyl sulfonyl, aryl sulfonyl, heteroalkyl sulfonyl, heteroaryl sulfonyl, alkyl carbonyl, aryl carbonyl, heteroalkyl carbonyl, heteroaryl carbonyl, alkoxycarbonyl, aryloxycarbonyl, heteroaryloxycarbonyl, alkylaminocarbonyl, arylaminocarbonyl, heteroarylaminocarbonyl or a combination thereof.
• Preferred moieties for R 2 are:
• Preferred moieties for R 3 are:
• R 31 OH or O-alkyl
• Y 19 is selected from the following moieties:
• Y 20 is selected from the following moieties:
• Additional R 3 moieties include the following:
• R 51 H, -COCH 3 , -COOtBu or -CONHtBu.
• Most preferred moieties for R 3 are:
• Preferred moieties for Y are:
• Y 11 is selected from H, COOH, COOEt, OMe, Ph, OPh,
• Y 12 is selected from H, COOH, COOMe, OMe, F, Cl, or Br; Y 13 is selected from the following moieties:
• Y 14 is selected from MeS(0 2 ), Ac, Boc, iBoc, Cbz, or Alloc; Y 15 and Y 16 are independently selected from alkyl, aryl, heteroalkyl, and heteroaryl; Y 17 is -CF 3 , -N0 2 , -C(0)NH 2 , -OH, -C(0)OCH 3 , -OCH 3) -OC 6 H 5 , -C 6 H 5 , -C(0)C 6 H 5 ,
• Y 18 is -C(0)OCH 3 , -N0 2 , -N(CH 3 ) 2 , F, -OCH 3 , -CH 2 C(0)OH, -C(0)OH, -S(0 2 )NH 2 , or -NHCOCH 3 .
• Y may be more preferably represented by:
• cyclic ring structure which may be a five-membered or six- membered ring structure.
• that cyclic ring represents a five-membered ring, it is a requirement of this invention that that five-membered cyclic ring does not contain a carbonyl group as part of the cyclic ring structure.
• that five- membered ring is of the structure:
• R 20 is selected from the following moieties:
• five-membered ring along with its adjacent two exocyclic carbonyls, may be represented as follows:
• R 2 and R 22 may be the same or different and are independently selected from the following moieties:
• Formula 1 may be represented by the following structures b and c:
• G and J are independently selected from the group consisting of (CH 2 ) P , (CHR) p , (CHR-CHR') p , and (CRR') P ;
• a and M are independently selected from the group consisting of O, S, S0 2 , NR, (CH 2 ) P , (CHR) P , (CHR-CHR') P , and (CRR') P ;
• Q is CH 2 , CHR, CRR', NH, NR, O, S, S0 2 , NR, (CH 2 ) P , (CHR) P , and (CRR') P .
• Preferred definitions for c are:
• alkyl refers to a monovalent group derived from a straight or branched chain saturated hydrocarbon by the removal of a single atom having from 1 to 8 carbon atoms, preferably from 1 to 6; aryl - represents a carbocyclic group having from 6 to 14 carbon atoms and having at least one benzenoid ring, with all available substitutable aromatic carbon atoms of the carbocyclic group being intended as possible points of attachment.
• Preferred aryl groups include phenyl, 1-naphthyl, 2-naphthyl and indanyl, and especially phenyl and substituted phenyl; aralkyl - represents a moiety containing an aryl group linked vial a lower alkyl; alkylaryl - represents a moiety containing a lower alkyl linked via an aryl group; cycloalkyl - represents a saturated carbocyclic ring having from 3 to 8 carbon atoms, preferably 5 or 6, optionally substituted.
• heterocyclic - represents, in addition to the heteroaryl groups defined below, saturated and unsaturated cyclic organic groups having at least one O, S and/or N atom interrupting a carbocyclic ring structure that consists of one ring or two fused rings, wherein each ring is 5-, 6- or 7-membered and may or may not have double bonds that lack delocalized pi electrons, which ring structure has from 2 to 8, preferably from 3 to 6 carbon atoms, e.g., 2- or 3-piperidinyl, 2- or 3-piperazinyi, 2- or 3-morpholinyl, or 2- or 3-thiomorpholinyl; halogen - represents fluorine, chlorine, bromine and iodine; heteroaryl - represents a cyclic organic group having at least one O, S and/or N atom interrupting a carbocyclic ring structure and having a sufficient number of delocalized pi electrons to provide aromatic character, with the aromatic heterocyclyl group having from 2 to 14, preferably 4 or 5
• Preferred heteroaryl groups are 2-, 3- and 4-pyridyl; such heteroaryl groups may also be optionally substituted. Additionally, unless otherwise specifically defined, as stated above, the term “substituted or unsubstituted” or “optionally substituted” refers to the subject moiety being optionally and chemically-suitably substituted with a moiety belonging to R 12 or R 13 .
• prodrug means compounds that are drug precursors which, following administration to a patient, release the drug in vivo via some chemical or physiological process (e.g., a prodrug on being brought to the physiological pH or through enzyme action is converted to the desired drug form).
• compositions containing as active ingredient a compound of Formula I (or its salt, solvate or isomers) together with a pharmaceutically acceptable carrier or excipient.
• the invention also provides methods for preparing compounds of Formula I, as well as methods for treating diseases such as, for example, HCV, AIDS (Acquired Immune Deficiency Syndrome), and related disorders.
• the methods for treating comprise administering to a patient suffering from said disease or diseases a therapeutically effective amount of a compound of Formula I, or pharmaceutical compositions comprising a compound of Formula I.
• HCV hepatitis C virus
• HCV protease is the NS3 or NS4a protease.
• inventive compounds inhibit such protease. They also modulate the processing of hepatitis C virus (HCV) polypeptide.
• HCV protease especially the HCV NS3/NS4a serine protease, or a pharmaceutically acceptable derivative thereof, where the various definitions are given above.
• the compounds of the invention may form pharmaceutically acceptable salts with organic or inorganic acids, or organic or inorganic bases.
• suitable acids for such salt formation are hydrochloric, sulfuric, phosphoric, acetic, citric, malonic, salicylic, malic, fumaric, succinic, ascorbic, maleic, methanesulfonic and other mineral and carboxylic acids well known to those skilled in the art.
• suitable bases are, for example, NaOH, KOH, NH 4 OH, tetraalkylammonium hydroxide, and the like.
• this invention provides pharmaceutical compositions comprising the inventive peptides as an active ingredient.
• the pharmaceutical compositions generally additionally comprise a pharmaceutically acceptable carrier diluent, excipient or carrier (collectively referred to herein as carrier materials). Because of their HCV inhibitory activity, such pharmaceutical compositions possess utility in treating hepatitis C and related disorders.
• the present invention discloses methods for preparing pharmaceutical compositions comprising the inventive compounds as an active ingredient.
• the active ingredients will typically be administered in admixture with suitable carrier materials suitably selected with respect to the intended form of administration, i.e. oral tablets, capsules (either solid-filled, semi-solid filled or liquid filled), powders for constitution, oral gels, elixirs, dispersible granules, syrups, suspensions, and the like, and consistent with conventional pharmaceutical practices.
• the active drug component may be combined with any oral non-toxic pharmaceutically acceptable inert carrier, such as lactose, starch, sucrose, cellulose, magnesium stearate, dicalcium phosphate, calcium sulfate, talc, mannitol, ethyl alcohol (liquid forms) and the like.
• suitable binders, lubricants, disintegrating agents and coloring agents may also be incorporated in the mixture.
• Powders and tablets may be comprised of from about 5 to about 95 percent inventive composition.
• Suitable binders include starch, gelatin, natural sugars, corn sweeteners, natural and synthetic gums such as acacia, sodium alginate, carboxymethylcellulose, polyethylene glycol and waxes.
• lubricants there may be mentioned for use in these dosage forms, boric acid, sodium benzoate, sodium acetate, sodium chloride, and the like.
• Disintegrants include starch, methylcellulose, guar gum and the like. Sweetening and flavoring agents and preservatives may also be included where appropriate.
• compositions of the present invention may be formulated in sustained release form to provide the rate controlled release of any one or more of the components or active ingredients to optimize the therapeutic effects, i.e. HCV inhibitory activity and the like.
• Suitable dosage forms for sustained release include layered tablets containing layers of varying disintegration rates or controlled release polymeric matrices impregnated with the active components and shaped in tablet form or capsules containing such impregnated or encapsulated porous polymeric matrices.
• Liquid form preparations include solutions, suspensions and emulsions. As an example may be mentioned water or water-propylene glycol solutions for parenteral injections or addition of sweeteners and pacifiers for oral solutions, suspensions and emulsions. Liquid form preparations may also include solutions for intranasal administration.
• Aerosol preparations suitable for inhalation may include solutions and solids in powder form, which may be in combination with a pharmaceutically acceptable carrier such as inert compressed gas, e.g. nitrogen.
• a pharmaceutically acceptable carrier such as inert compressed gas, e.g. nitrogen.
• a low melting wax such as a mixture of fatty acid glycerides such as cocoa butter is first melted, and the active ingredient is dispersed homogeneously therein by stirring or similar mixing. The molten homogeneous mixture is then poured into convenient sized molds, allowed to cool and thereby solidify.
• solid form preparations which are intended to be converted, shortly before use, to liquid form preparations for either oral or parenteral administration.
• liquid forms include solutions, suspensions and emulsions.
• the compounds of the invention may also be deliverable transdermally.
• the transdermal compositions may take the form of creams, lotions, aerosols and/or emulsions and can be included in a transdermal patch of the matrix or reservoir type as are conventional in the art for this purpose.
• the compound is administered orally, intravenously or subcutaneously.
• the pharmaceutical preparation is in a unit dosage form. In such form, the preparation is subdivided into suitably sized unit doses containing appropriate quantities of the active components, e.g., an effective amount to achieve the desired purpose.
• the quantity of the inventive active composition in a unit dose of preparation may be generally varied or adjusted from about 1.0 milligram to about 1 ,000 milligrams, preferably from about 1.0 to about 950 milligrams, more preferably from about 1.0 to about 500 milligrams, and typically from about 1 to about 250 milligrams, according to the particular application.
• the actual dosage employed may be varied depending upon the patient's age, sex, weight and severity of the condition being treated. Such techniques are well known to those skilled in the art.
• the human oral dosage form containing the active ingredients can be administered 1 or 2 times per day.
• the amount and frequency of the administration will be regulated according to the judgment of the attending clinician.
• a generally recommended daily dosage regimen for oral administration may range from about 1.0 milligram to about 1 ,000 milligrams per day, in single or divided doses.
• Capsule - refers to a special container or enclosure made of methyl cellulose, polyvinyl alcohols, or denatured gelatins or starch for holding or containing compositions comprising the active ingredients.
• Hard shell capsules are typically made of blends of relatively high gel strength bone and pork skin gelatins. The capsule itself may contain small amounts of dyes, opaquing agents, plasticizers and preservatives.
• Tablet- refers to a compressed or molded solid dosage form containing the active ingredients with suitable diluents. The tablet can be prepared by compression of mixtures or granulations obtained by wet granulation, dry granulation or by compaction.
• Oral gel- refers to the active ingredients dispersed or solubilized in a hydrophillic semi-solid matrix.
• Powder for constitution refers to powder blends containing the active ingredients and suitable diluents which can be suspended in water or juices.
• Diluent - refers to substances that usually make up the major portion of the composition or dosage form. Suitable diluents include sugars such as lactose, sucrose, mannitol and sorbitol; starches derived from wheat, corn, rice and potato; and celluloses such as microcrystalline cellulose.
• the amount of diluent in the composition can range from about 10 to about 90% by weight of the total composition, preferably from about 25 to about 75%, more preferably from about 30 to about 60% by weight, even more preferably from about 12 to about 60%.
• Disintegrant - refers to materials added to the composition to help it break apart (disintegrate) and release the medicaments.
• Suitable disintegrants include starches; "cold water soluble” modified starches such as sodium carboxymethyl starch; natural and synthetic gums such as locust bean, karaya, guar, tragacanth and agar; cellulose derivatives such as methylcellulose and sodium carboxymethylcellulose; microcrystalline celluloses and cross-linked microcrystalline celluloses such as sodium croscarmellose; alginates such as alginic acid and sodium alginate; clays such as bentonites; and effervescent mixtures.
• the amount of disintegrant in the composition can range from about 2 to about 15% by weight of the composition, more preferably from about 4 to about 10% by weight.
• Binder - refers to substances that bind or "glue” powders together and make them cohesive by forming granules, thus serving as the "adhesive" in the formulation. Binders add cohesive strength already available in the diluent or bulking agent. Suitable binders include sugars such as sucrose; starches derived from wheat, corn rice and potato; natural gums such as acacia, gelatin and tragacanth; derivatives of seaweed such as alginic acid, sodium alginate and ammonium calcium alginate; cellulosic materials such as methylcellulose and sodium carboxymethylcellulose and hydroxypropylmethylcellulose; polyvinylpyrrolidone; and inorganics such as magnesium aluminum silicate.
• the amount of binder in the composition can range from about 2 to about 20% by weight of the composition, more preferably from about 3 to about 10% by weight, even more preferably from about 3 to about 6% by weight.
• Lubricant - refers to a substance added to the dosage form to enable the tablet, granules, etc. after it has been compressed, to release from the mold or die by reducing friction or wear.
• Suitable lubricants include metallic stearates such as magnesium stearate, calcium stearate or potassium stearate; stearic acid; high melting point waxes; and water soluble lubricants such as sodium chloride, sodium benzoate, sodium acetate, sodium oleate, polyethylene glycols and d'l- leucine. Lubricants are usually added at the very last step before compression, since they must be present on the surfaces of the granules and in between them and the parts of the tablet press.
• the amount of lubricant in the composition can range from about 0.2 to about 5% by weight of the composition, preferably from about 0.5 to about 2%, more preferably from about 0.3 to about 1.5% by weight.
• Glident - material that prevents caking and improve the flow characteristics of granulations, so that flow is smooth and uniform.
• Suitable glidents include silicon dioxide and talc.
• the amount of glident in the composition can range from about 0.1% to about 5% by weight of the total composition, preferably from about 0.5 to about 2% by weight.
• Coloring agents - excipients that provide coloration to the composition or the dosage form. Such excipients can include food grade dyes and food grade dyes adsorbed onto a suitable adsorbent such as clay or aluminum oxide.
• the amount of the coloring agent can vary from about 0.1 to about 5% by weight of the composition, preferably from about 0.1 to about 1 %.
• Bioavailability - refers to the rate and extent to which the active drug ingredient or therapeutic moiety is absorbed into the systemic circulation from an administered dosage form as compared to a standard or control.
• compositions disclosed above for treatment of diseases such as, for example, hepatitis C and the like.
• the method comprises administering a therapeutically effective amount of the inventive pharmaceutical composition to a patient having such a disease or diseases and in need of such a treatment.
• the compounds of the invention may be used for the treatment of HCV in humans in monotherapy mode or in a combination therapy (e.g., dual combination, triple combination etc.) mode such as, for example, in combination with antiviral and/or immunomodulatory agents.
• a combination therapy e.g., dual combination, triple combination etc.
• antiviral and/or immunomodulatory agents examples include Ribavirin (from Schering-Plough Corporation, Madison, New Jersey) and LevovirinTM (from ICN Pharmaceuticals, Costa Mesa, California), VP 50406TM (from Viropharma, Incorporated, Exton, Pennsylvania), ISIS 14803TM (from ISIS Pharmaceuticals, Carlsbad, California), HeptazymeTM (from Ribozyme Pharmaceuticals, Boulder, Colorado), VX 497TM (from Vertex Pharmaceuticals, Cambridge, Massachusetts), ThymosinTM (from SciClone Pharmaceuticals, San Mateo, California), MaxamineTM (Maxim Pharmaceuticals, San Diego, California), mycophenolate mofetil (from Hoffman-LaRoche, Nutley, New Jersey), interferon (such as, for example, interferon-alpha, PEG-interferon alpha conjugates) and the like.
• Ribavirin from Schering-Plough Corporation, Madison, New Jersey
• LevovirinTM from ICN Pharmaceuticals, Costa Mesa, California
• PEG- interferon alpha conjugates are interferon alpha molecules covalently attached to a PEG molecule.
• Illustrative PEG-interferon alpha conjugates include interferon alpha-2a (RoferonTM, from Hoffman La-Roche, Nutley, New Jersey) in the form of pegylated interferon alpha-2a (e.g., as sold under the trade name PegasysTM), interferon alpha-2b (IntronTM, from Schering-Plough Corporation) in the form of pegylated interferon alpha-2b (e.g., as sold under the trade name PEG-lntronTM), interferon alpha-2c (Berofor AlphaTM, from Boehringer Ingelheim, Ingelheim, Germany) or consensus interferon as defined by determination of a consensus sequence of naturally occurring interferon alphas (InfergenTM, from Amgen, Thousand Oaks, California).
• the invention includes tautomers, rotamers, enantiomers and other stereoisomers of the inventive compounds also.
• inventive compounds may exist in suitable isomeric forms. Such variations are contemplated to be within the scope of the invention.
• Another embodiment of the invention discloses a method of making the compounds disclosed herein.
• the compounds may be prepared by several techniques known in the art. Representative illustrative procedures are outlined in the following reaction schemes. It is to be understood that while the following illustrative schemes describe the preparation of a few representative inventive compounds, suitable substitution of any of both the natural and unnatural amino acids will result in the formation of the desired compounds based on such substitution. Such variations are contemplated to be within the scope of the invention.
• HOOBt 3-Hydroxy-1 ,2,3-benzotriazin-4(3H)-one
• EDCI 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride
• NMM N-Methylmorpholine
• ADDP 1 ,1'-(Azodicarbobyl)dipiperidine
• Phenyl iBoc isobutoxycarbonyl iPr: isopropyl *Bu or Bu': terf-Butyl
• HATU 0-(7-azabenzotriazol-1-yl)-1 ,1 ,3,3-tetramethyluronium hexafluorophosphate
• Step A Compound (1.3) from Preparative Example 2, Step A (3.0 g) was treated with 4 N HCI/dioxane (36 mL) and stirred at room temperature for 7 min. The mixture was poured into 1.5 L cold (5°C) hexane and stirred, then allowed to set cold for 0.5 hr.
• N-Cbz-hydroxyproline methyl ester available from Bachem Biosciences, Incorporated, King of Prussia, Pennsylvania
• compound 3.01
• toluene 30 mL
• ethyl acetate 30 mL
• the mixture was stirred vigorously, and then a solution of NaBr/water (1.28 g /5 mL) was added.
• TEMPO 2,2,6,6-tetramethyl-1-piperidinyloxy free radical
• Ethyl acetate 1000 mL was added to the lower acetonitrile layer, and then the layer was washed with 10% aqueous KH2PO4 (2 x 700 mL), and brine.
• the filtrate was evaporated under vacuum in a 25°C water bath, taken up in fresh ethyl acetate (1000 mL), and washed successively with 0.1 N HCl, 0.1 N NaOH, 10% aqueous KH2PO4, and brine.
• the organic solution was dried over anhydrous MgS04, filtered, and evaporated under vacuum.
• Step B Compound (3.7).
• Step A Compound (4.5) was prepared.
• Step B Compound (4.6)
• Step B Compound (4.6) was prepared.
• Step C Compound (4.7)
• the synthesis was done in a reaction vessel which was constructed from a polypropylene syringe cartridge fitted with a polypropylene frit at the bottom.
• the Fmoc-protected amino acids were coupled under standard solid-phase techniques.
• Each reaction vessel was loaded with 100 mg of the starting Fmoc- Sieber resin (approximately 0.03 mmol).
• the resin was washed with 2 mL portions of DMF (2 times).
• the Fmoc protecting group was removed by treatment with 2 mL of a 20 % v/v solution of piperidine in DMF for 20 min.
• the resin was washed with 2 mL portions of DMF (4 times).
• the coupling was done in DMF (2 mL), using 0.1 mmol of Fmoc-amino acid, 0.1 mmol of HATU [ 0-(7- azabenzotriazol-1-yl)-1 ,1 ,3,3-tetramethyluronium hexafluorophosphate ] and 0.2 mmol of DIPEA (N,N-diisopropylethylamine). After shaking for 2 h, the reaction vessel was drained and the resin was washed with 2 mL portions of DMF (4 times). The coupling cycle was repeated with the next Fmoc-amino acid or capping group.
• the synthesis was conducted in a reaction vessel which was constructed from a polypropylene syringe cartridge fitted with a polypropylene frit at the bottom.
• Resin-bound hydroxy compound (approximately 0.03 mmol) was treated with a solution of 0.12 mmol of Dess-Martin periodinane and 0.12 mmol of t-BuOH in 2 mL of DCM for 4 h.
• the resin was washed with 2 mL portions of a 20 % v/v solution of iPrOH in DCM, THF, a 50 % v/v solution of THF in water (4 times), THF
• Compound 901 B was dissolved in 10 % w/w aqueous sodium hydroxide solution (15 mL) and the resulting solution was heated under reflux for 24 h. Concentrated hydrochloric acid was added and the pH was adjusted to neutral (pH 7). The resulting solution containing compound 901 C was evaporated under reduced pressure. The residue was dissolved in 5 % w/w aqueous sodium bicarbonate solution (150 mL).
• N-Fmoc-phenylalanine 801 A (5 g, 12.9 mmol) in anhydrous DCM (22 mL) cooled to -30°C in a dry ice-acetone bath was added N- methylpyrrolidine (1.96 mL, 16.1 mmol) and methyl chloroformate (1.2 mL, 15.5 mmol) sequentially.
• the reaction mixture was stirred at -30°C for 1 h and a solution of N.O-dimethylhydroxylamine hydrochloride (1.51 g, 15.5 mol) and N- methylpyrrolidine (1.96 mL, 16.1 mmol) in anhydrous DCM (8 mL) was added.
• Resin-bound compound 301 B, 301 C, 301 D, 301 E, 301 F and 301 G were prepared according to the general procedure for solid-phase coupling reactions started with 100 mg of Fmoc-Sieber resin (0.03 mmol). Resin-bound compound 301 G was oxidized to resin-bound compound 301 H according to the general procedure for solid-phase Dess-Martin oxidation. The resin-bound compound 301 H was treated with 4 mL of a 2 % v/v solution of TFA in DCM for 5 min. The filtrate was added to 1 mL of AcOH and the solution was concentrated by vacuum centrifugation to provide compound 301 J (0.0069 g, 29 % yield). MS (LCMS-Electrospray) 771.2 MH + . Using the solid phase synthesis techniques detailed above, and the following moieties for the various functionalities in the compound of Formula 1 , the compounds in Table 3 were prepared:
• Step 1 Synthesis of tert-Butyl N-tert-butoxycarbonyl-4-methyl-L-pyroqlutamate ,Boc-PyroGlu.4-methyl.-QtBu _:
• the solution was stirred for 20 minutes at 0 °C, then the reaction mixture was concentrated in vacuo to remove the tefrahydrofuran.
• the aqueous solution was diluted with water (10 mL) and extracted with dichloromethane (3 x 40 mL). The organic layers were dried (Na 2 SO 4 ), filtered and concentrated. The residue was dissolved in dichloromethane (20 mL) and triethylsilane (310 ⁇ L, 2.0 mmol), then cooled to -78 °C and boron trifluoride diethyletherate (270 ⁇ L, 2.13 mmol) was added dropwise.
• Part a To a cooled (-78 °C) solution of Boc-PyroGlu(4,4-diallyl)-tert- butylester (2.13 g, 5.83 mmol) in tefrahydrofuran (14 ml) was added lithium triethylborohydride (1 M in tefrahydrofuran, 7.29 ml, 7.29 mmol) over five minutes. After two hours at -78 °C, the reaction was warmed-up to 0 °C and quenched by the slow addition of saturated sodium bicarbonate solution (20 ml) and 30% hydrogen peroxide (20 drops). Stirring continued for 20 minutes.
• the Boc-Pro(4-spirocyclopentane)-tert-butylester (1.26, 3.9 mmol) was treated with dichloromethane (10 ml) and trifluoroacetic acid (15 ml) for three hours.
• the reaction mixture was concentrated and the yellow oil obtained was dissolved in water (6 ml).
• Fluorenylmethyl succinyl carbonate (1.45 g, 4.3 mmol) dissolved in dioxane (6 ml) was added portionwise followed by the addition of potassium carbonate (2.16 g, 15.6 mmol). The reaction was stirred for 18 hours and concentrated.
• the oil was dissolved in water (53 mL) containing sodium carbonate (5.31 g, 50.1 mmol) and a solution of fluorenylmethyl succinyl carbonate (8.37 g, 29.8 mmol) in dioxane (60 mL) was added over 40 min.
• the reaction mixture was stirred at room temperature for 17 h, then concentrated to remove the dioxane and diluted with water (200 mL).
• the solution was washed with ether (3 x 100 mL).
• the pH of the aqueous solution was adjusted to 2 by the addition of citric acid (caution! foaming! and water (100 mL).
• the solution was washed with ether (3 x 75 mL).
• the pH of the aqueous solution was adjusted to 2 by the addition of citric acid (approx. 20 g, caution! foaming! and water (100 mL).
• the mixture was extracted with dichloromethane (4 x 100 mL), and the combined organic layers were dried (sodium sulfate), filtered and concentrated.
• the crude product contained a major impurity which necessitated a three step purification.
• the crude product was dissolved in dichloromethane (50 mL) and trifluoroacetic acid (50 mL) and stirred for 5 h before being concentrated.
• the residue was purified by preparatory reverse-phase HPLC.
• Step I Synthesis of iBoc-G(Chx)-P,4,4-dimethyl)-OMe:
• N-benzyloxycarbonyl-L-phenylglycine 25g, 88 mmols was dissolved in THF (800mL) and cooled to -10 °C.
• N-methylmorpholine 9.7 mL, 88 mmols
• isobutylchloroformate (11.4 mL, 88.0 mmols) were added and the mixture allowed to stir for 1 minute.
• Dimethylamine 100 mL, 2M in THF
• the mixture was filtered and the filtrate concentrated in vacuo to afford N-benzyloxycabonyl -L-phenylglycine dimethylamide (32.5 g) as a yellow oil.
• N-benzyloxycarbonyl-L-phenylglycine dimethylamide (32.5 g) obtained above was dissolved in methanol (750 ml) and 10% palladium on activated carbon (3.3 g) was added. This mixture was hydrogenated on a Parr apparatus under 35 psi hydrogen for 2 hours. The reaction mixture was filtered and the solvent removed in vacuo and the residue recrystallized from methanol-hexanes to afford phenylglycine dimethylamide (26g) as an off white solid. The ee of this material was determined to be >99% by HPLC analysis of the 2,3,4,6-tetra-O- acetylglucopyranosylthioisocyanate derivative.
• Step l
• Step 7 Synthesis of iBoc-G(Chx)-Pro.4,4-dimethyl )-Leu-.CO.-Glv-Phq- dimethylamide:
• reactors for the solid-phase synthesis of peptidyl ketoamides are comprised of a reactor vessel with at least one surface permeable to solvent and dissolved reagents, but not permeable to synthesis resin of the selected mesh size.
• Such reactors include glass solid phase reaction vessels with a sintered glass frit, polypropylene tubes or columns with frits, or reactor Kans ⁇ M made by Irori Inc., San Diego CA.
• the type of reactor chosen depends on volume of solid-phase resin needed, and different reactor types might be used at different stages of a synthesis. The following procedures will be referenced in the subsequent examples:
• Procedure A Coupling reaction: To the resin suspended in N-methylpyrrolidine (NMP) (10-15 mL/ gram resin) was added Fmoc-amino acid (2 eq), HOAt (2 eq), HATU (2 eq) and diisopropylethylamine (4 eq). The mixture was let to react for 4- 48 hours. The reactants were drained and the resin was washed successively with dimethylformamide, dichloromethane, methanol, dichloromethane and diethylether (use 10-15 mL solvent/ gram resin). The resin was then dried in vacuo.
• NMP N-methylpyrrolidine
• Procedure B Fmoc deprotection: The Fmoc-protected resin was treated with 20% piperidine in dimethylformamide (10 mL reagent/ g resin) for 30 minutes. The reagents were drained and the resin was washed successively with dimethylformamide, dichloromethane, methanol, dichloromethane and diethyl ether (10 mL solvent/ gram resin).
• Procedure C Boc deprotection: The Boc-protected resin was treated with a 1 :1 mixture of dichloromethane and trifluoroacetic acid for 20-60 minutes (10 mL solvent/ gram resin). The reagents were drained and the resin was washed successively with dichloromethane, dimethylformamide, 5% diisopropylethylamine in dimethylformamide, dimethylformamide, dichloromethane and dimethylformamide (10 mL solvent/ gram resin).
• Procedure D Semicarbazone hydrolysis: The resin was suspended in the cleavage cocktail (10 mL/ g resin) consisting of trifluoroacetic acid: pyruvic acid: dichloromethane: water 9:2:2:1 for 2 hours. The reactants were drained and the procedure was repeated three more times. The resin was washed successively with dichloromethane, water and dichloromethane and dried under vacuum.
• Procedure E HF cleavage: The dried peptide-nVal(CO)-G-0-PAM resin (50 mg) was placed in an HF vessel containing a small stir bar. Anisole (10% of total volume) was added as a scavenger. In the presence of glutamic acid and cysteine amino acids, thioanisole (10%) and 1 ,2-ethanedithiol (0.2%) were also added. The HF vessel was then hooked up to the HF apparatus (Immuno
• Example XXII Representative solid phase Synthesis of Hep C inhibitors: (iBoc- G(Chx)-P(4t-NHS02Ph.-nV-(CO.-G-G(Ph.-NH2)
• Step IB To a solution of Fmoc-nVal-CHO (Step IB) (5.47 g, 16.90 mmol) in dichloromethane (170 ml) was added allyl isocyanoacetate (Step IA) (2.46 ml, 20.28 mmol) and pyridine (5.47 ml, 67.61 mmol). The reaction mixture was cooled to 0°C and trifluoroacetic acid (3.38 ml, 33.80 mmol) was added dropwise. The reaction was stirred at 0°C for 1 h, and then at room temperature for 48 hours. TLC taken in ethylacetate confirmed the completion of the reaction.
• the commercially available MBHA resin (2.6 g, 1.12 mmol/g, 2.91 mmol) was transferred to a 250 mL fritted solid phase reaction vessel equipped with a nitrogen inlet. It was then washed thoroughly with 30 ml portions of dichloromethane, methanol, dimethylformamide and dichloromethane and coupled over 18 hours to the commercially available Fmoc-Phg-OH (2.17 g, 5.82 mmol) according Procedure A with 99.82% efficiency. The resin was then subjected to Fmoc deprotection according to procedure B. A qualitative ninhydrin assay on a small aliquot gave dark blue resin and solution, indicating a successful reaction.
• step II The resin obtained in step II (2.6 g, 0.8 mmol/g, 2.91 mmol) was reacted with Fmoc-nVal-(dpsc)-Gly-Oallyl (Step IG) (5.82 mmol, 3.77 g) according to Procedure A. After 18 hours, quantitative ninhydrin analysis indicated 99.91% coupling efficiency.
• the resin was subjected to Fmoc deprotection according to procedure B. A qualitative ninhydrin assay on a small aliquot gave dark blue resin and solution, indicating a successful reaction.
• Step 7 Synthesis of Fmoc-G(Chx)-Pro(4t-NHSO ? Bn)-nVal(dpsc.-Glv-Phq-MBHA resin:
• Step 8 Synthesis of iBoc-G(Chx)-Pro(4t-NHS02Bn)-nVal(dpsc.-Glv-Phq-MBHA resin:
• the resin obtained in the previous step (Fmoc-G(Chx)-Pro(4t-NHS02Bn)- nVal(dpsc)-Gly-Phg-MBHA resin) was subjected to Fmoc deprotection according to procedure B.
• a ninhydrin assay on a small aliquot gave dark blue resin and solution, indicating a successful reaction.
• To the resin (0.2 g, 0.22 mmol) suspended in 2 ml NMP was added isobutylchloroformate (0.12 ml, 0.90 mmol) followed by diisopropylethylamine (0.31 ml, 1.79 mmol), and the reaction mixture was shaken for 18 hours at room temperature.
• Step 9 Synthesis of iBoc-G(Chx)-Pro(4t-NHS02Bn)-nVal(CO.-Glv-Phq-MBHA resin:
• Step 10 Synthesis of Synthesis of iBoc-G(Chx)-Pro(4t-NHSQ2Bn)-nVal(CO)-Glv- Phq-NH?:
• the resin of the previous step (iBoc-G(Chx)-Pro(4t-NHS0 2 Bn)-nVal(CO)- Gly-Phg-MBHA resin) (100 mg) was subjected to HF cleavage condition (Procedure E) to yield the desired crude product.
• the material was purified by HPLC using a 2.2 x 25 cm reverse phase column, containing a C-18 resin comprised of 10 micron size gel particles with a 300 angstrom pore size, eluting with a gradient using 20-50% acetonitrile in water.
• XXIIIi can also be obtained directly by the reaction of XXIIIf (4.5 g, 17.7 mmol) with aq. H 2 0 2 (10 mL), LiOH-H 2 0 (820 mg, 20.8 mmol) at 0 °C in 50 mL of CH 3 OH for 0.5 h.) Step 9.
• the amino ester XXIIII was prepared following the method of R. Zhang and J. S. Madalengoitia (J. Org. Chem. 1999, 64, 330), with the exeception that the Boc group was cleved by the reaction of the Boc-protected amino acid with methanolic HCl.
• a solution of commercial amino acid Boc-Chg-OH, XXIIIk (Senn chemicals, 6.64 g, 24.1 mmol) and amine hydrochloride XXIIII (4.5 g, 22 mmol) in CH 2 CI 2 (100 mL) at 0 °C was treated with BOP reagent and stirred at rt. for 15 h.
• Step 1
• Step 1
• Step 2 The product of Step 2 (0.5g) was reacted with Dess-Martin reagent (1g) in the manner previously described in Example XX, Step 7. Purification by flash column chromatography (40% EtOAc, Hexane, silica) furnished 0.35g of product XXVIIIe. Mass spectrum (LCMS) 522 (M+H + ). Step 4:
• Step 4 The product of Step 4 (0.3g) was added a 1/1 H 2 0/MeOH solution (20 mL) and NaHC03 solid (242 mg, ⁇ equiv.). After being stirred for 18 hours at room temperature, the reaction was diluted with EtOAc and layers were separated. The aqueous layer was acidified to pH 2 with HCl 1.0 N and extracted with EtOAc. The EtOAc layer was washed with brine then dried over MgS0 , filtered and concentrated in vacuo to afford product XXVIIIf as a white powder (0.26g). Mass spectrum (LCMS) 508 (M+H + ). Step 5:
• Step l
• Step 1
• Step 1
• Step 1
• Step 1

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