WO2003035057A1 - Inhibitors of dipeptidyl peptidase iv - Google Patents

Inhibitors of dipeptidyl peptidase iv Download PDF

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Publication number
WO2003035057A1
WO2003035057A1 PCT/GB2002/004764 GB0204764W WO03035057A1 WO 2003035057 A1 WO2003035057 A1 WO 2003035057A1 GB 0204764 W GB0204764 W GB 0204764W WO 03035057 A1 WO03035057 A1 WO 03035057A1
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WO
WIPO (PCT)
Prior art keywords
alkyl
compound according
butyloxycarbonyl
vacuo
residue
Prior art date
Application number
PCT/GB2002/004764
Other languages
French (fr)
Inventor
David Michael Evans
Doreen Mary Ashworth
Original Assignee
Ferring B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2003537624A priority Critical patent/JP2005511541A/en
Application filed by Ferring B.V. filed Critical Ferring B.V.
Priority to HU0401738A priority patent/HUP0401738A2/en
Priority to AU2002336190A priority patent/AU2002336190B2/en
Priority to US10/491,794 priority patent/US7335677B2/en
Priority to NZ532048A priority patent/NZ532048A/en
Priority to CA002464254A priority patent/CA2464254A1/en
Priority to IL16119102A priority patent/IL161191A0/en
Priority to EP02770089A priority patent/EP1446116A1/en
Priority to KR10-2004-7005918A priority patent/KR20040047943A/en
Priority to MXPA04003829A priority patent/MXPA04003829A/en
Publication of WO2003035057A1 publication Critical patent/WO2003035057A1/en
Priority to NO20042080A priority patent/NO20042080L/en
Priority to US12/004,054 priority patent/US20080255126A1/en

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    • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
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    • C07D207/30—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members
    • C07D207/32—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two 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
    • C07D207/33—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two 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 with substituted hydrocarbon radicals, directly attached to ring carbon atoms
    • C07D207/335—Radicals substituted by nitrogen atoms not forming part of a nitro radical
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    • A61P3/00—Drugs for disorders of the metabolism
    • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
    • A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
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    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing three or more hetero rings

Definitions

  • the present invention relates to novel compounds that are inhibitors of post-proline aminopeptidases.
  • the compounds are useful as antiproliferative agents and in the treatment of, inter alia, type 2 diabetes and impaired glucose tolerance.
  • X 3 , X 4 and X 5 are either nitrogen N or CH, provided that at least two of X 3 , X 4 and X 5 are N.
  • X 6 is either O or NH.
  • R 2 is either H or alkyl.
  • R 3 is selected from H, CI, OH, O- alkyl, NH 2 , NH-alkyl and N(alkyl) 2 .
  • R 4 , R 5 , R 6 , R 7 and R 8 are selected from H, Br, CI, F, CF 3 , alkyl, acyl, OH, O-alkyl, NH 2 , NH-alkyl, N(alkyl) 2 , N0 2 , NH-acyl, C0 2 H, C0 2 -alkyl, CONH 2 , CONH-alkyl, CON(alkyl) 2 and CN.
  • X 7 is CH 2 , O, S or NH.
  • R 9 is either H or alkyl.
  • R 18 is H, alkyl, aryl, OH, O-alkyl, NH 2 , NH-alkyl or N(alkyl) 2
  • R 19 is H, alkyl, aryl, F, CI, Br, CF 3 , OH, O-alkyl, NH 2 , NH-alkyl or N(alkyl) 2
  • the integers d and e are 0, 1 , 2 or 3 such that d+e is 3, 4 or 5, and f is 1 , 2 or 3.
  • X 1 may not be S or CH 2 if b is 1.
  • Preferred compositions are inhibitors of non-membrane associated post-proline cleaving proteases. The most preferred compositions are selective for non-membrane associated proteases (e.g. for example inhibitors of one or more of QPP, DPP-8 and/or DPP-9).
  • the group R 1 is either a hydrogen atom H or a nitrile group CN.
  • the group X 1 is selected from an oxygen atom O, a sulphur atom S, a methylene group CH 2 , a monofluoromethylene group CHF.a difluoromethylene group CF 2 , an ethylidene group CH(CH 3 ), a 2-propylidene group C(CH 3 ) 2 and a cyanomethylene group CH(CN).
  • the integer b is either 1 or 2, such that the nitrogen-containing ring has 5 or 6 members.
  • the group G 3 is selected from a group according to general formula 2, a group according to general formula 3 and a group according to general formula 4.
  • R 4 , R 5 , R 6 , R 7 and R 8 are independently selected from H, Br, CI, F, CF 3 , alkyl, acyl, OH, 0- alkyl, NH 2 , NH-alkyl, N(alkyl) 2 , N0 2 , NH-acyl, C0 2 H, C0 2 -alkyl, CONH 2 , CONH-alkyl, CON(alkyl) 2 and CN.
  • alkenyl denotes monounsaturated hydrocarbon groups with between 2 and 10 carbon atoms, including straight-chain, branched and mono- and polycycloalkenyl groups, such as vinyl, allyl, methallyl, cyclohex-3-enyl and the like.
  • aryl groups may optionally be substituted with up to three groups independently selected from alkyl, OH, O-alkyl, CI, F, Br, NH 2 , NH-alkyl, N(alkyl) 2 , C0 2 H, C0 2 -alkyl, CONH 2 , CONH-alkyl, CON(alkyl) 2 , N0 2 and CN.
  • aralkyl denotes alkyl groups that are substituted by, or fused to, one or more aryl groups, including benzyl, phenethyl, indanyl, fluorenyl and the like.
  • polyfluoroalkyl denotes an alkyl group wherein all the hydrogen atoms on one or more of the carbon atoms are replaced by fluorine atoms, including trifluoromethyl, 2,2,2-trifluoroethyl and the like.
  • R 1 is H.
  • R 1 is CN
  • X 1 is CH 2 .
  • X 1 is S.
  • b is 2.
  • a is 0.
  • a is 1.
  • a is 1 and X 2 is CH 2 .
  • a is 2 and X 2 is CH 2 .
  • the compound is a compound according to general formula 10.
  • the compound is a compound according to general formula 11.
  • the compound is a compound according to general formula 12.
  • the compound is a compound according to general formula 13.
  • the compounds of the present invention can be prepared by methods generally known in the art and illustrated in the following non-limiting examples.
  • (2S)-1-( / ⁇ -(terf-Butyloxycarbonyl)- ⁇ / ⁇ , ⁇ -(dicinnamyl)-L-lysinyl)pyrrolidine-2- carbonitrile (32mg, 0.057mmol) was dissolved in 4M HCI/dioxan (20mL). After 1 h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as (2S)-1-[/ ⁇ f,/ ⁇ T-(dicinnamyl)-L- lysinyl]pyrrolidine-2-carbonitrile dihydrochloride (37mg, 0.053mmol, 93%).
  • (2S)-1-( ⁇ / ⁇ -(tert-Butyloxycarbonyl)- ⁇ / ⁇ ,/ ⁇ -(dicinnamyl)-L-ornithinyl)pyrrolidine-2- carbonitrile (67mg, 0.12mmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as (2S)-1-[/ ⁇ T,/ ⁇ T-(dicinnamyl)-L- ornithinyl]pyrrolidine-2-carbonitrile dihydrochloride (82mg, 0.12mmol, 100%).
  • (2S)-1-( ⁇ / ⁇ -(tert-Butyloxycarbonyl)- ⁇ / ⁇ -(cinnamyl)-L-ornithinyl)pyrrolidine-2-carbonitrile (71mg, 0.17mmol). was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as (2S)-1-[ ⁇ T-(cinnamyl)-L-ornithinyl]pyrrolidine-2- carbonitrile dihydrochloride (91mg, 0.16mmol, 100%).
  • 3-( ⁇ /°-(tert-Butyloxycarbonyl)-L-lysinyl)thiomorpholine (150mg, 0.45mmol) was dissolved in methanol (25mL). To this solution was added 3- cyclohexenecarboxaldehyde (400mg, 0.45mmol). After 30mins sodium triacetoxyborohydride (150mg, 0.71 mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL).
  • 3-Chloroaniline was dissolved in xylene. 2-Aminonicotinic acid was added. The reaction mixture was heated at 150 °C for 18 hours after which time the reaction mixture was diluted with ethyl acetate giving an off-white solid identified as 3- chloroanilinonicotinic acid.
  • Cyanuric chloride (1.844g, 10mmol) was dissolved in acetonitrile (20mL). The solution was cooled to -20 °C. A solution of 2,5-dichloroaniline (1.62g, 10mmol) and triethylamine (1.0g, 10mmol) was slowly added. After 1 hour at -20 °C the solvent was removed in vacuo and the residue was taken up in ethyl acetate (150mL). The solution was washed with water (1 x 50mL) and brine (1 x 50mL), dried (Na 2 S0 4 ) and evaporated in vacuo.
  • N-(fert-Butyloxycarbonyl)-3-hydroxypyrrolidine (21.0g, 10.7mmol) was dissolved in CH 2 CI 2 (30ml).
  • (Diethylamino)sulphur trifluoride (1.72g, 10.7mmol) was added to this solution at -78 °C.
  • the mixture was stirred for 18 hours at -78 °C to room temperature then the reaction mixture was carefully poured into sat. NaHC0 3 (100ml) and stirred for 15min and extracted with CH 2 CI 2 .
  • the organic extract was washed with water and brine, dried (Na 2 S0 4 ) and evaporated in vacuo to give an orange oil.
  • N-2 ' -(fert-Butyloxycarbonyl)-N-(2 " -(9-fluorenylmethyloxycarbonyI aminoethyl)-glycine (2. ⁇ g, ⁇ .7mmol) was dissolved in CH 2 Cl 2 /DMF (9:1 , 100mL). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (1. ⁇ g, 11.1 mmol), water-soluble carbodiimide (1.3g, 6.8mmoI), piperidine (484mg, ⁇ .69mmol) and N-methylmorpholine (800mg, ⁇ mmol).
  • N-2 x -(terf-Butyloxycarbonyl)-N-(2"-(9-fIuorenylmethyloxycarbonyl aminoethyl)-glycine (1.0g, 2.27mmoI) was dissolved in CH 2 CI 2 /DMF (9:1 , 10OmL).
  • 1-hydroxybenzotriazole hydrate (620mg, 4.6mmol)
  • water-soluble carbodiimide ⁇ 60mg, 2.8mmol
  • 3,3-difluoropyrrolidine hydrochloride 360mg, 2. ⁇ mmol
  • N-methylmorpholine ⁇ OOmg, ⁇ mmol
  • Cyanuric chloride (1. ⁇ 44g, 10mmol) was dissolved in acetonitrile (20mL). The solution was cooled to -20 °C. A solution of 4-fluoroaniline (1.1g, 10mmol) and triethylamine (1.0g, 10mmol) was slowly added. After 1 hour at -20 °C the solvent was removed in vacuo and the residue was taken up in ethyl acetate (1 ⁇ 0mL). The solution was washed with water (1 x ⁇ OmL) and brine (1 x ⁇ OmL), dried (Na 2 S0 4 ) and evaporated in vacuo.

Abstract

Novel compounds that are inhibitors of one or most post-proline cleaving proteases, e.g. dipeptidyl peptidase IV, according to general formula (1). R1 is H or CN, X1 is O, S, CH¿2?, CHF, CF2, CH(CH3), C(CH3)2 or CH(CN), and b is 1 or 2. G?1¿ is H or a group according to the formula -CH¿2?-X?2-(CH¿2)a-G?3 and G2¿ is H or a group according to the formula -CH¿2?-(CH29a-G?3¿, provided that one of G?1 and G2¿ is H and the other is not H. X2 is O, S, or CH¿2?, and a is 0, 1 or 2, provided that when a is 1 then X2 is CH2. G?3¿ is a group according to one of general formulae 2-4., where the variables have meaning given in the description. The compounds are useful in the treatment of i.a. type 2 diabetes and impaired glucose tolerance.

Description

INHIBITORS OF DIPEPTIDY PEPTIDASE IV
The present invention relates to novel compounds that are inhibitors of post-proline aminopeptidases. The compounds are useful as antiproliferative agents and in the treatment of, inter alia, type 2 diabetes and impaired glucose tolerance.
BACKGROUND
The enzyme dipeptidyl peptidase IV, herein abbreviated DP-IV (and elsewhere as DAP-IV or DPP-1V) and also known by the classification EC.3.4.14.5, is a serine protease that cleaves the N-terminal dipeptide from peptides that begin with the sequence H-Xaa-Pro (where Xaa is any amino acid, although preferably a lipophilic one, and Pro is proline). It will also accept as substrates peptides that begin with the sequence H-Xaa-Ala (where Ala is alanine). DP-IV was first identified as a membrane-bound protein. More recently a soluble form has been identified.
Initial interest in DP-IV focussed on its role in the activation of T lymphocytes. DP-IV is identical to the T cell protein CD26. It was proposed that inhibitors of DP-IV would be capable of modulating T cell responsiveness, and so could be developed as novel immunomodulators. It was further suggested that CD26 was a necessary co-receptor for HIV, and thus that DP-IV inhibitors could be useful in the treatment of AIDS.
Attention was given to the role of DP-IV outside the immune system. It was recognised that DP-IV has a key role in the degradation of several peptide hormones, including growth hormone releasing hormone (GHRH) and glucagon-like peptide-1 and -2 (GLP-1 and GLP-2). Since GLP-1 is known to have a potentiating effect on the action of insulin in the control of post-prandial blood glucose levels it is clear that DP-IV inhibitors might also be usefully employed in the treatment of type II diabetes and impaired glucose tolerance. At least two DP-IV inhibitors are currently undergoing clinical trials to explore this possibility.
Several groups have disclosed inhibitors of DP-IV. While some leads have been found from random screening programs, the majority of the work in this field has been directed towards the investigation of substrate analogues. Inhibitors of DP-IV that are substrate analogues are disclosed in, for example, US 5,462,928, US 5,543,396, WO95/15309 (equivalent to US 5,939,560 and EP 0731789), W098/19998 (equivalent to US 6,011,155), W099/46272 and W099/61431.
More recently a number of proteins have been found that share some of the enzymatic properties of DP-IV. Some, such as FAP and DPP-8, have sequence homology with DP-IV, while others, such as QPP, have no such homology but nevertheless mimic the aminodipeptidase activity of DP-IV. The physiological function of these newer proteases is still being investigated. FAP has been implicated in invasive processes such as cancer metastasis and endometriosis, and QPP appears to be involved in immune-cell apoptosis. It is also possible that some of these proteases share a common function. This redundancy would allow continuing normal physiological function in the event of a failure in the expression or function of one of the proteases.
In order to further define the roles of these newer proteases it is important to have the tools to manipulate selectively each one or the whole class. Therefore there exists a need for specific and potent inhibitors of each of these proteases, and also for potent non-specific inhibitors of the class of post-proline cleaving aminodipeptidases.
SUMMARY OF THE INVENTION
We disclose herein a series of novel compounds that are inhibitors of one or more post-proline cleaving proteases, and specifically compounds according to general formula 1.
Figure imgf000004_0001
1
In general formula 1, R1 is H or CN, X1 is O, S, CH2, CHF, CF2, CH(CH3), C(CH3)2 or CH(CN), and b is 1 or 2. G1 is H or a group according to the formula -CH2-X2-(CH2)a- G3 and G2 is H or a group according to the formula -CH2-(CH2)a-G3, provided that one of G1 and G2 is H and the other is not H. X2 is O, S or CH2, and a is 0, 1 or 2, provided that when a is 1 then X2 is CH2. G3 is a group according to one of general formulae 2- 4.
Figure imgf000005_0001
X3, X4 and X5 are either nitrogen N or CH, provided that at least two of X3, X4 and X5 are N. X6 is either O or NH. R2 is either H or alkyl. R3 is selected from H, CI, OH, O- alkyl, NH2, NH-alkyl and N(alkyl)2. R4, R5, R6, R7 and R8 are selected from H, Br, CI, F, CF3, alkyl, acyl, OH, O-alkyl, NH2, NH-alkyl, N(alkyl)2, N02, NH-acyl, C02H, C02-alkyl, CONH2, CONH-alkyl, CON(alkyl)2 and CN. X7 is CH2, O, S or NH. R9 is either H or alkyl. R10, R11, R12, R13 and R14 are selected from H, Br, CI, F, CF3, alkyl, acyl, OH, O- alkyl, NH2, NH-alkyl, N(alkyl)2, N02, NH-acyl, C02H, C02-alkyl, CONH2, CONH-alkyl, CON(alkyl)2 and CN. R15 and R 6 are each independently H, alkyl, alkenyl, polyfluoroalkyl, aralkyl, aryl or CH2- -R17, where L is a covalent bond, CH=CH, C≡C or - C6H4-, and R 7 is H, alkyl or aryl, or R15 and R16 together are a group according to one of general formulae 5-7.
Figure imgf000005_0002
R18 is H, alkyl, aryl, OH, O-alkyl, NH2, NH-alkyl or N(alkyl)2, and R19 is H, alkyl, aryl, F, CI, Br, CF3, OH, O-alkyl, NH2, NH-alkyl or N(alkyl)2. The integers d and e are 0, 1 , 2 or 3 such that d+e is 3, 4 or 5, and f is 1 , 2 or 3. When R15 and R16 are both H then X1 may not be S or CH2 if b is 1. Preferred compositions are inhibitors of non-membrane associated post-proline cleaving proteases. The most preferred compositions are selective for non-membrane associated proteases (e.g. for example inhibitors of one or more of QPP, DPP-8 and/or DPP-9).
DETAILED DESCRIPTION OF THE INVENTION
In a first aspect, the present invention relates to a series of novel α-amino acyl derivatives of saturated nitrogen-containing heterocycles according to general formula 1.
Figure imgf000006_0001
1
In general formula 1, the group R1 is either a hydrogen atom H or a nitrile group CN. The group X1 is selected from an oxygen atom O, a sulphur atom S, a methylene group CH2, a monofluoromethylene group CHF.a difluoromethylene group CF2, an ethylidene group CH(CH3), a 2-propylidene group C(CH3)2 and a cyanomethylene group CH(CN). The integer b is either 1 or 2, such that the nitrogen-containing ring has 5 or 6 members.
The group G1 is either H or a group according to the formula -CH2-X2-(CH2)a-G3 and the group G2 is either H or a group according to the formula -CH2-(CH2)a-G3, provided that one of G1 and G2 is H and the other is not H. The group X2 is selected from 0, S and CH2. The integer a is 0, 1 or 2, provided that when a is 1 then X2 is CH2.
The group G3 is selected from a group according to general formula 2, a group according to general formula 3 and a group according to general formula 4.
Figure imgf000007_0001
In general formula 2, the groups X3, X4 and X5 are selected from nitrogen N and methine CH, provided that at least two of X3, X4 and X5 are nitrogen. Preferably X3, X4 and X5 are ail nitrogen. The group X6 is selected from O and NH. R2 is selected from H and alkyl. R3 is selected from H, CI, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2. R4, R5, R6, R7 and R8 are independently selected from H, Br, CI, F, CF3, alkyl, acyl, OH, 0- alkyl, NH2, NH-alkyl, N(alkyl)2, N02, NH-acyl, C02H, C02-alkyl, CONH2, CONH-alkyl, CON(alkyl)2 and CN.
In general formula 3, the group X7 is selected from CH2, O, S and NH. R9 is selected from H and alkyl. R10, R11, R12, R13 and R14 are independently selected from H, Br, CI, F, CF3, alkyl, acyl, OH, O-alkyl, NH2, NH-alkyl, N(alkyl)2, N02, NH-acyl, C02H, C02- alkyl, CONH2, CONH-alkyl, CON(alkyl)2 and CN.
In general formula 4, R15 and R 6 are each independently selected from H, alkyl, alkenyl, polyfluoroalkyl, aralkyl, aryl and CH2-L-R17, where L is selected from a covalent bond, CH=CH, C≡C and -C6H4- and R 7 is selected from H, alkyl and aryl, or R15 and R16 together are a group selected from general formula 5, general formula 6 and general formula 7.
Figure imgf000007_0002
In these general formulae, the group R18 is selected from H, alkyl, aryl, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2, and the group R19 is selected from H, alkyl, aryl, F, CI, Br, CF3, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2. The integers d and e are selected from 0, 1, 2 and 3 such that d+e is 3, 4 or 5, and the integer f is selected from 1 , 2 and 3.
When R15 and R16 are both H then X1 may not be S or CH2 if b is 1.
The term alkyl, as used herein, denotes saturated hydrocarbon groups with between 1 and 10 carbon atoms, including straight-chain, branched and mono- and polycycloalkyl groups, such as methyl, ethyl, propyl, isopropyl, n-butyl, tert-butyl, cyclopentyl, cyclohexylmethyi, 2-cyclohexyl-2-propyl, bicyclo[2.2.2]octyl and the like.
The term alkenyl, as used herein, denotes monounsaturated hydrocarbon groups with between 2 and 10 carbon atoms, including straight-chain, branched and mono- and polycycloalkenyl groups, such as vinyl, allyl, methallyl, cyclohex-3-enyl and the like.
The term aryl, as used herein, denotes monocyclic and fused bicyclic aromatic groups, including carbocyclic groups, such as phenyl and naphthyl, and heteroaryl groups with up to three heteroatoms selected from nitrogen, oxygen and sulphur, such as pyrrolyl, furyl, thienyl, pyrazolyl, imidazolyl, oxazolyl, isothiazolyl, pyridyl, pyrimidinyl, indolyl, quinolinyl and the like. Unless otherwise specified, aryl groups may optionally be substituted with up to three groups independently selected from alkyl, OH, O-alkyl, CI, F, Br, NH2, NH-alkyl, N(alkyl)2, C02H, C02-alkyl, CONH2, CONH-alkyl, CON(alkyl)2, N02 and CN.
The term aralkyl, as used herein, denotes alkyl groups that are substituted by, or fused to, one or more aryl groups, including benzyl, phenethyl, indanyl, fluorenyl and the like.
The term acyl, as used herein, denotes a group selected from H-CO, alkyl-CO, aryl-CO and aralkyl-CO, including formyl, acetyl, benzoyl, phenylacetyl and the like.
The term polyfluoroalkyl, as used herein, denotes an alkyl group wherein all the hydrogen atoms on one or more of the carbon atoms are replaced by fluorine atoms, including trifluoromethyl, 2,2,2-trifluoroethyl and the like. In one preferred embodiment of the invention R1 is H.
In another preferred embodiment of the invention R1 is CN.
In another preferred embodiment of the invention X1 is CH2.
ln another preferred embodiment of the invention X1 is S.
In another preferred embodiment of the invention b is 1.
In another preferred embodiment of the invention b is 2.
In another preferred embodiment of the invention a is 0.
In another preferred embodiment of the invention a is 0 and X2 is CH2.
In another preferred embodiment of the invention a is 1.
In another preferred embodiment of the invention a is 1 and X2 is CH2.
In another preferred embodiment of the invention a is 2 and X2 is CH2.
In another preferred embodiment of the invention the compound is a compound according to general formula 8.
Figure imgf000009_0001
In another preferred embodiment of the invention the compound is a compound according to general formula 9.
Figure imgf000010_0001
In another preferred embodiment of the invention the compound is a compound according to general formula 10.
Figure imgf000010_0002
In another preferred embodiment of the invention the compound is a compound according to general formula 11.
Figure imgf000011_0001
In another preferred embodiment of the invention the compound is a compound according to general formula 12.
Figure imgf000011_0002
12
In another preferred embodiment of the invention the compound is a compound according to general formula 13.
Figure imgf000011_0003
13
It will be recognised that certain of the compounds within the scope of the present invention are capable of forming salts with suitable acids or bases. To the extent that such salts are pharmaceutically acceptable they are included within the scope of this invention It will further be recognised that certain of the compounds within the scope of the present invention are capable of existing as optical isomers, such as enantiomers and diastereomers. All such optical isomers and mixtures thereof, including but not limited to racemates, are included within the scope of the invention.
The compounds of the present invention are inhibitors of post-proline cleaving proteases such as DPP-1V, QPP, FAP, DPP-8 (DPRP-1) and DPP-9 (DPRP-2). As such they may be useful in the treatment of diseases in which dysregulation of these enzymes or their endogenous substrates plays a role or the disease is ameliorated by inhibition of such enzymes. Accordingly, in further aspects, the present invention provides for the use of compounds according to the present invention in the preparation of pharmaceutical compositions, and for the use of such compositions a therapeutic agents.
Preferred compositions which are inhibitors for QPP may have G2=H, b = 1 or 2 and/or a = 0 or 1. Further preferred compositions having b=2 include G1 groups having a=0 or 1 and X2 is CH2. Further preferred compositions having b=2 have X =CH2 or S, for example Example 38 of Table 2. Further preferred compositions having b=1 include G1 groups having a=0 or 1 and X2 is CH2. . Further preferred compositions having b=1 have X = S or CH2 or CF2 , for example, Example 42 of Table 2.
The compounds of the present invention can be prepared by methods generally known in the art and illustrated in the following non-limiting examples.
EXAMPLES
EXAMPLE 1
(2S)-1-[Nω,Λ/ω-(Dicinnamyl)-L-lysinyl]pyrrolidine-2-carbonitrile dihydrochloride
Figure imgf000012_0001
A. (ΛP-ffert-Butyloxycarbony -Λ -tθ-fluorenylmethyloxycarbony -L-lysiny -L- prolinamide
Λ/α-(tert-ButyloxycarbonyI)-ΛT-(9-fluorenylmethyloxycarbonyl)-L-lysine (5g, 10Jmmol) was dissolved in CH2CI2 (100mL). The solution was cooled to 0°C, L-prolinamide (1.78g, 11.7mmol) and PyBOP® (6.7g, 12.8mmol) were added, and the pH adjusted to pH9 with triethylamine. After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (200mL). The solution was washed with 0.3M KHS04 (2 x 50mL), sat. NaHC03 (2 x 50mL), water (2 x 50mL) and brine (1 x 50mL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 2% methanol, 98% chloroform) to give a colourless oil identified as (Λ/α-(tert-butyloxycarbonyl)-Λ/t0-(9- fluorenylmethyloxycarbonyl)-L-lysinyl)-L-prolinamide (4.05g, 7.2mmol, 67%).
B. (2S)-1-(Λ/"-(tert-Butyloxycarbonyl)-Λ/ω-(9-fluorenylmethyloxycarbonyl)-L- lysinyl)pyrrolidine-2-carbonitrile
(Λ/α-(terf-Butyloxycarbonyl)-/Vn-(9-fluorenylmethyloxycarbonyl)-L-lysinyl)-L-prolinamide (3.95g, 7.02mmol) was dissolved in dry THF (100mL). The solution was cooled to 0°C, triethylamine (1.4g, 14mmol) was added followed by the slow addition of trifluoroacetic anhydride (2.97g, 14.1mmol). The pH was adjusted to pH9 with triethylamine. After 30min the reaction mixture was diluted with ethyl acetate (1 OOmL), washed with water (1 x 50mL) and brine (1 x 50mL), dried (Na2S04) and evaporated in vacuo to give an orange oil. The residue was purified by flash chromatography on silica gel (eluant: 60% pet ether, 40% ethyl acetate) to give a colourless oil identified as (2S)- 1-(Λ/α-(tert-butyloxycarbonyl)-ΛT-(9-fluorenylmethyloxycarbonyl)-L-lysinyl)pyrrolidine-2- carbonitrile (3.3g, 6.11 mmol, 87%).
C. (2S)-1-(ΛT'-(fert-Butyloxycarbonyl)-L-lysinyl)pyrrolidine-2-carbonϊtrile
(2S)-1-(Λ/α-(tert-Butyloxycarbonyl)-Λ/ω-(9-fluorenylmethyloxycarbonyl)-L-lysinyl)- pyrroIidine-2-carbonitrile (3.1g, 5.7mmol) was dissolved in THF (80mL). Diethylamine (20mL) was added. After 2h at room temperature the solvent was removed in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 90% chloroform, 7% methanol, 3% triethylamine) to give a colourless oil identified as (2S)-1~ (/^-(tert-butyloxycarbony -L-lysiny pyrrolidine^-carbonitrile (1.63g, 5.03mmol, 89%). D. (2S)-1-(Λ/α-(tert-Butyloxycarbonyl)-Λ/t0,Λω-(dicinnamyl)-L-lysinyl)pyrrolidine-2- carbonitrile
(2S)-1-(Λ/α-(terf-Butyloxycarbonyl)-L-lysinyl)pyrrolidine-2-carbonitrile (100mg,
0.31 mmol) was dissolved in methanol (25mL). To this solution was added trans- cinnamaldehyde (170mg, 1.18mmol). After 30mins sodium triacetoxyborohydride (330mg, 1.56mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 2% methanol, 98% chloroform) to give a colourless oil identified as (2S)-1-(/\f-(ferf-butyIoxycarbonyl)-/ /<o,/VC0-(dicinnamyl)-L- lysinyl)pyrrolidine-2-carbonitrile (38mg, 0.068mmol, 11%). Further elution with 9% methanol, 90% chloroform and 1 % acetic acid gave a colourless oil identified as (2S)- 1-(Λ/α-(tert-butyloxycarbonyl)-Λ/ω-(cinnamyl)-L-lysinyl)pyrrolidine-2-carbonitrile (32mg, 0.073mmol, 12%)
E. (2S)-1-[ ΛT.ΛT-tDicinnamy -L-lysinyllpyrrolidine^-carbonitrile dihydrochloride
(2S)-1-( /α-(terf-Butyloxycarbonyl)-Λ/ω,Λ -(dicinnamyl)-L-lysinyl)pyrrolidine-2- carbonitrile (32mg, 0.057mmol) was dissolved in 4M HCI/dioxan (20mL). After 1 h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as (2S)-1-[/\f,/\T-(dicinnamyl)-L- lysinyl]pyrrolidine-2-carbonitrile dihydrochloride (37mg, 0.053mmol, 93%).
[M+H]+ = 457.3
1H NMR (CD3OD): δ 1.35-1.55 (2H, m), 1.75-2.00 (2H, m), 2.05-2.23 (6H, m), 3.10-3.29 (4H, m), 3.61-3.68 (2H, m), 4.00-4.03 (4H, m), 4.20-4.30 (1H, m), 4.82-4.93 (1H, m), 6.34-6.39 (2H, m), 6.94 (2H, d, J = 5.8Hz), 7.31-7.37 (6H, m), 7.39-7.53 (4H, m) ppm.
EXAMPLE 2
(2S)-1-[ΛT-(Cinnamyl)-L-lysinyl]pyrrolidine-2-carbonitrile dihydrochloride
Figure imgf000015_0001
A. (2S)-1-[Wω-(Cinnamyl)-L-lysinyl]pyrrolidine-2-carbonitrile dihydrochloride
(2S)-1-(Λ/α-(tert-Butyloxycarbonyl)-ΛT-(cinnamyl)-L-lysinyl)pyrrolidine-2-carbonitrile (32mg, 0.057mmol). was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as (2S)-1-[/\T-(cinnamyl)-L-lysinyl]pyrrolidine-2- carbonitrile dihydrochloride (37mg, 0.053mmol, 93%).
[M+H]+ = 341.5
1H NMR (CD3OD): δ 1.29-1.55 (2H, m), 1.72-1.80 (2H, m), 1.90-2.11 (2H, m), 2.16-2.29 (6H, m), 3.02-3.09 (2H, m), 3.65-3.69 (2H, m), 3.78-3.82 (2H, m), 4.23-4.27 (1H, m), 4.81-4.82 (1H, m), 4.91-4.99 (1H, m), 6.21-6.32 (1H, m), 6.86 (1H, d, J=6.1Hz), 7.26- 7.35 (3H, m), 7.37-7.40 (2H, m) ppm.
EXAMPLE 3
(2S)-1-[Λ/ω,Λ/ω-(Dicinnamyl)-L-ornithinyl]pyrrolidine-2-carbonitrile dihydrochloride
Figure imgf000015_0002
A. (2S)-1-(Λ/α-(fert-Butyloxycarbonyl)-L-ornithyl)pyrrolidϊne-2-carbonitrile
(2S)-1-(Λ/α-(tert-Butyloxycarbonyl)-L-omithyl)pyrrolidine-2-carbonitrile was prepared by the method described for the lysine derivative in Example 1.
B. (2S)-1-(Λ/α-(tert-Butyloxycarbonyl)-ΛfD,Λr-(dicinnamyl)-L-ornithinyl)pyrrolidine- 2-carbonitrile
(2S)-1-(Λ/α-(tert-Butyloxycarbonyl)-L-ornithinyl)pyrrolidine-2-carbonitrile (200mg,
0.65mmol) was dissolved in methanol (25mL). To this solution was added trans- cinnamaldehyde (180mg, 1.25mmol). After 30mins sodium triacetoxyborohydride (343mg, 1.63mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography (eluant: 2% methanol, 98% chloroform) to give a colourless oil identified as (2S)-1 -(Λ/α-(tert-butyloxycarbonyl)-Λ ,/Vco-(dicinnamyl)-L-ornithinyl)- pyrrolidine-2-carbonitrile (77mg, 0.14mmol, 22%). Further elution with 9% methanol, 90% chloroform and 1% acetic acid gave a colourless oil identified as (2S)-1-(Λ/α-(tert- butyloxycarbonyl)-Λ/ω-(cinnamyl)-L-omithinyl)pyrrolidine-2-carbonitriIe (78mg,
0.18mmol, 28%).
C. (2S)-1-[ΛfB,/Vω-(Dicinnamyl)-L-ornithinyl]pyrrolidine-2-carbonitrile dihydrochloride
(2S)-1-(Λ/α-(tert-Butyloxycarbonyl)-Λ/ω,/\ -(dicinnamyl)-L-ornithinyl)pyrrolidine-2- carbonitrile (67mg, 0.12mmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as (2S)-1-[/\T,/\T-(dicinnamyl)-L- ornithinyl]pyrrolidine-2-carbonitrile dihydrochloride (82mg, 0.12mmol, 100%).
[M+H]+ = 443.3
1H NMR (CD3OD): δ 1.98-2.12 (4H, m), 2.22-2.29 (4H, m), 3.27-3.31 (4H, m), 3.62-3.67 (2H, m), 3.96 (4H, d, J=7.5Hz), 4.30-4.40 (1H, m), 4.80-4.83 (1H, m), 6.34-6.41 (2H, m), 6.96 (2H, d, J=15.6Hz), 7.31-7.39 (6H, m), 7.49-7.53 (4H, m) ppm. EXAMPLE 4
(2S)-1-[Λ/a>-(Cinnamyl)-L-ornithinyl]pyrrolidine-2-carbonitrile dihydrochloride
Figure imgf000017_0001
A. (2S)-1 -[AT°-(Cinnamyl)-L-ornithinyl]pyrrolidine-2-carbonitrile dihydrochloride
(2S)-1-(Λ/α-(tert-Butyloxycarbonyl)-Λ/ω-(cinnamyl)-L-ornithinyl)pyrrolidine-2-carbonitrile (71mg, 0.17mmol). was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as (2S)-1-[ΛT-(cinnamyl)-L-ornithinyl]pyrrolidine-2- carbonitrile dihydrochloride (91mg, 0.16mmol, 100%).
[M+H]+ = 327.5
1H NMR (CD3OD): δ 1.70-1.88 (2H, m), 1.97-2.01 (2H, m), 2.14-2.32 (4H, m), 3.08-3.13 (2H, m), 3.29-3.31 (3H, m), 3.68-3.71 (2H, m), 3.79-3.82 (2H, m), 4.29-4.31 (1H, m), 4.87-4.91 (1H, m), 6.29-6.31 (1H, m), 6.86 (1H, d, J=15.8Hz), 7.29-7.30 (3H, m), 7.44- 7.48 (2H, m) ppm.
EXAMPLE 5
3-[ΛP-ΛP-(Dicinnamyl)-L-lysinyl]thiazolidine dihydrochloride
Figure imgf000017_0002
A. S-tΛP-ttert-ButyloxycarbonylJ-Λ -tθ-fluorenylmethyloxycarbony -L-lysinyl]- thiazolidine
Λ/α-(tert-Butyloxycarbonyl)-ΛT-(9-fluorenylmethyloxycarbonyl)-L-lysine (2.73g, 6mmol) was dissolved in CH2CI2 /DMF (9:1, 100mL). To this solution at 0°C were added 1 -hydroxy benzotriazole hydrate (1.53g, 10mmol), water-soluble carbodiimide (1.34g, 7mmol), thiazolidine (1.28g, 18mmol) and N-methylmorpholine (1.0g, 10mmol). After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (100mL). The solution was washed with 0.3M KHS04 (2 x 25mL), sat. NaHC03 (2 x 25mL), water (2 x 25mL) and brine (1 x 25mL), dried (Na2S0 ) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 75% ethyl acetate, 25% pet. ether) to give a white solid identified as 3-[Λ/α-(tert-butyloxycarbonyl)-ΛT-(9-fluorenylmethyIoxycarbonyI)-L-lysinyl]thiazolidine (2.55g, 4.85mmol, 81%).
B. 3-[Λ/"-(terf-Butyloxycarbonyl)-L-lysinyl]thiazolidine
3-[Λ/α-(ferf-Butyloxycarbonyl)-/\ -(9-fluorenylmethyloxycarbonyl)-L-Iysinyl]thiazolidine (1.15g, 2.13mmol) was dissolved in acetonitrile (20mL). Diethylamine (5mL) was added. After 90min at room temperature the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel (eluant: 90% chloroform, 7% methanol, 3% triethylamine) to give a pale yellow oil identified as 3-[Λ/"-(tert- butyloxycarbonyl)-L-lysinyl]thiazolidine (530mg, 1.67mmol, 78%).
C. S^ΛT-Jtert-Butyloxycarbony -Λ ^-tdicinnamy -L-lysiny thiazolidine
3-(Λ/α-(tert-Butyloxycarbonyl)-L-Iysinyl)thiazolidine (200mg, 0.6mmol) was dissolved in methanol (25mL). To this solution was added trans-cinnamaldehyde (400mg, 3.0mmol). After 30mins sodium triacetoxyborohydride (534mg, 2.54mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 2% methanol, 98% chloroform) to give a colourless oil identified as 3-(Λ/α-(tert-butyIoxycarbonyl)-/\T,Λ/ω-(di- cinnamyl)-L-lysinyl)thiazolidine (139mg, 0.25mmol, 40%). D. 3-tΛr,ΛT-(Dicinnamyl)-L-lysinyl]thiazolidine dihydrochloride
3-(Λ/α-(tert-Butyloxycarbonyl)-Λ/ω,Λ/ω-(di-cinnamyl)-L-lysinyl)thiazolidine (139mg,
0.25mmol). was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a pale brown solid identified as 3-[Λ/ω,Λ/ω-(dicinnamyl)-L-lysinyl]thiazolidine dihydrochloride (127mg, 0.24mmol, 96%).
[M+H]+ = 450.2
1H NMR (CD3OD): δ 1.49-1.55 (2H,m), 1.89-1.98 (4H, m), 3.01-3.30 (4H, m), 3.4-3.5 (4H, m), 3.7-3.9 (3H, m), 4.0-4.2 (3H, m), 4.2-4.8 (2H, br m), 6.38-6.44 (2H, m), 6.99- 6.93 (2H, m), 7.34-7.37 (5H, m), 7.51-7.60 (4H, m) ppm.
EXAMPLE 6
3 ^,ΛT-(Cinnamyl)-L-lysinyl]thiazolidine dihydrochloride
Figure imgf000019_0001
A. 3-(Λ/α-(fe_rt-Butyloxycarbonyl)-Λω,Λ/0>-(cinnamyl)-L-lysinyl)thiazolidine
3-(Λ/α-(tert-Butyloxycarbonyl)-L-lysinyl)thiazolidine (200mg, 0.6mmol) was dissolved in methanol (25mL). To this solution was added trans-cinnamaldehyde (400mg, 3.0mmol). After 30mins sodium triacetoxyborohydride (534mg, 2.54mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1 % triethylamine, 5% methanol, 94% chloroform) to give a colourless oil identified as 3-(Λ/α-(tert- butyloxycarbonyl)-AT,/\T-(cinnamyl)-L-lysinyl)thiazolidine (215mg, 0.50mmol, 83%). B. 3-[ Λr,/^-(Cinnamyl)-L-lysinyl]thiazolidine dihydrochloride
3-(Λ/α-(tert-Butyloxycarbonyl)-/\ ,ΛT-(cinnamyl)-L-lysinyl)thiazolidine (215mg,
O.δmmol). was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a pale brown solid identified as 3-[/\T,/\T-(cinnamyl)-L-lysinyl]thiazolidine dihydrochloride (160mg, 0.40mmol, 79%).
[M+H]+ = 334.4
1H NMR (CD3OD): δ 1.28-1.30 (1H, m), 1.51-1.53 (1H, m), 1.79-1.78 (1 H, m), 1.93-1.98 (2H, m), 2.9-3.3 (5H, m), 3.6-3.8 (5H, m), 4.30-4.70 (5H, m), 6.2-6.3 (1H, m), 6.85- 6.91(1H, m), 7.1-7.7 (5H, m) ppm.
EXAMPLE 7
1-[AP-(Cyclohexylmethyl)-L-ornithinyl]pyrolidine dihydrochloride
Figure imgf000020_0001
A. 1-[Wω-(Benzyloxycarbonyl)-Λα-(tert-butyloxycarbonyl)-L-ornithinyl]pyrrolidine
/\T-(Benzyloxycarbonyl)-/\/a-(fert-butyloxycarbonyl)-L-omithine (5.49g, 15mmol) was dissolved in CH2CI2 /DMF (9:1 , 100mL). To this solution at 0°C was added 1-hydroxybenzotriazole hydrate (3.37g, 22mmol), water-soluble carbodiimide (3.46g, 18mmol), pyrrolidine (1.28g, 18mmol) and N-methylmorpholine (2.0g, 20mmol). After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (200mL). The solution was washed with 0.3M KHS04 (2 x 50mL), sat. NaHC03 (2 x 50mL), water (2 x 50mL) and brine (1 x 50mL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 90% ethyl acetate, 10% pet. ether) to give a colourless oil identified as 1 -[ΛT-(benzyloxycarbonyl)-Λ/α-(tert-butyloxycarbonyl)-L- omithinyljpyrrolidine (5.15g, 12.3mmol, 82%). B. l-IΛ -fterf-ButyloxycarbonyO-L-ornithinyllpyrrolidine
1-[Λ/ω-(Benzyloxycarbonyl)-Λ/t-(terf-butyloxycarbonyl)-L-ornithinyl]pyrrolidine (2.15g, 5.13mmol) was dissolved in methanol (80mL). This solution was hydrogenated over 10% Pd/C (400mg). After 2h the catalyst was filtered off and washed with methanol (50mL). The combined filtrates were evaporated in vacuo to give an off white solid identified as ^[/^-(tert-butyloxycarbony -L-ornithinyljpyrrolidine (1.35g, 4.74mmol, 94%).
C. l-tAT-ttert-Butyloxycarbony -AT-tcyclohexylmethy -L-ornithiny pyrrolidine 1-[Λf-(tert-Butyloxycarbonyl)-L-ornithinyl]pyrrolidine (100mg, 0.35mmol) was dissolved in methanol (25mL). To this solution was added cyclohexanecarboxaldehyde (44mg, 0.39mmol). After 30mins sodium triacetoxyborohydride (148mg, 0.70mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1% triethylamine, 5% methanol, 94% chloroform) to give a colourless oil identified as
Figure imgf000021_0001
Butyloxycarbonyl)-ΛT-(cyclohexylmethyl)-L-ornithinyl)pyrrolidine (51 mg, 0.18mmol, 52%).
D. l-IΛT- Cyclohexylmethy -L-ornithinyllpyrrolidine dihydrochloride
1 -(Λ/α-(tert-Butyloxycarbonyl)-Λ/ω-(cyclohexylmethyl)-L-ornithinyl)pyrrolidine (215mg, O.δmmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[/\ -(cyclohexylmethyl)-L-ornithinyl]pyrrolidine dihydrochloride (160mg, 0.40mmol, 79%).
[M+H]+ = 282.3
1H NMR (CD3OD): δ 0.93-1.24 (3H, m), 1.66-1.81 (15H, m), 2.50-2.70 (2H, m), 2.71-
2.88 (2H, m), 3.2-3.48 (6H, m), 4.08 (1H, m), 8.35-8.38 (1H, m), 8.80-8.85 (1H, m) ppm. EXAMPLE 8
3-[/ B-Me-/\T°-(2-napthylmethyl)-L-lysinyl]thiazolidine dihydrochloride
Figure imgf000022_0001
A. ΛT-ftert-Butyloxycarbonyl- T-benzyl-L-lysine methyl ester
N tert-Butyloxycarbonyl-L-lysine methyl ester (6.1g, 22.2mmol) was dissolved in methanol (100mL). To this solution was added benzaldehyde (1.9g, 17.5mmol). After 2 hours sodium triacetoxyborohydride (5.8g, 27.3mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (200mL). This solution was washed with sat Na HC03 (1 x 50mL), water (12 x 50mL) and brine (1 x 50mL), dried (Na2S0 ) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1 % acetic acid, 5% methanol, 94% chloroform) to give a colourless oil identified as lT-(teιi- butyloxycarbonyl-Λf- benzyl-L-lysine methyl ester (5.2g, 14.2mmol, 82%).
B. ΛP-tert-Butyloxycarbonyl-ΛT-benzyl-ΛT-rnethyl-L-lysine methyl ester
Λf-fert-Butyloxycarbonyl-ΛT-benzyl-L-lysine methyl ester (5.0g, 14.2mmol) was dissolved in methanol (100mL). To this solution was added formaldehyde (37% solution in water, 10mL). After 2 hours sodium triacetoxyborohydride (3.9g, 18.4mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (200mL). This solution was washed with sat. Na HCOs (1 x 50mL), water (12 x 50mL) and brine (1 x 50mL), dried (Na2S04) and evaporated in vacuo to give a . colourless oil identified as
Figure imgf000022_0002
ΛT- benzyl-/V0-methyl-L-lysine methyl ester (5.2g, 14.2mmol, 100%).
C. ΛP-ferf-Butyloxycarbonyl-ΛT-methyl-L-lysine methyl ester
Λ -fert-Butyloxycarbonyl-ΛT-benzyl-Λ -methyl-L-lysine methyl ester (5.0g, 14.2mmol) was dissolved in methanol/water (9:1 , 100mL). To this solution was added ammonium formate (1.6, 19.3mmol) and 10% palladium on charcoal (2g) . After 3 hours at 60 °C the catalyst was filtered off through celite and the residue washed with methanol (50mL). The combined filtrates were evaporated in vacuo and the residue was taken up in chloroform (200mL). This solution was washed with sat Na HC03 (1 x 50mL), water (12 x 50mL) and brine (1 x 50mL), dried (Na2S04) and evaporated in vacuo to give a colourless oil identified as /^-(tert-butyloxycarbonyl-N^-methyl-L-lysine methyl ester (3.48g, 12.5mmol, 93%).
D. Λ/α-fert-Butyloxycarbonyl-Nm-(1 ,1 -dimethyl-2,2,2-trichloroethoxycarbonyl)-ΛT- methyl-L-lysine methyl ester
Nα-terf-Butyloxycarbonyl-Nω-methyl-L-lysine methyl ester (3.1g, 11.1 mmol) was dissolved in dichloromethane (100mL). To this solution was added 1 ,1-dimethyl-2,2,2- trichloroethyl chloroformate (3.0g, 12.5mmol) and triethylamine (2.3g, 23mmol) . After 18 hours at room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (200mL). This solution was washed with 0.3M KHS04 (1x 50mL),sat NaHC03 (1 x 50mL), water (1 x 50mL) and brine (1 x 50mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil purified by flash chromatography on silica gel (eluant: 30% ethyl acetate, 70% pet. ether) to give colourless oil identified as Nα- (tert-butyloxycarbonyl-NC0-(1,1-dimethyl-2,2,2-trichloroethoxycarbonyl)-Nω-methyl-L- lysine methyl ester (3.28g, 6.98mmol, 63%).
E. Wα-terf-Butyloxycarbonyl-Nω-(1 ,1 -dimethyl-2,2,2-trichloroethoxycarbonyl)-ΛfB- methyl-L-lysine
Nα-(tert-Butyloxycarbonyl-Nω-(1 , 1 -dimethyl^^^-trichloroethoxycarbony -N^methyl-L- lysine methyl ester (3.1g, 6.6mmol) was dissolved in tetrahydrofuran (100mL). 1M Lithium hydroxide (7mL, 7.0mmol) was added. After 3 hours at room temperature the reaction mixture was diluted with ethyl acetate (150mL), washed with 1M HCI (1 x 50mL), water (1 x 50mL) and brine (1 x 50mL), dried (Na2S04) and evaporated in vacuo to give colourless oil identified as Nα-(fert-butyloxycarbonyl-Nω-(1,1-dimethyl- 2,2,2-trichloroethoxycarbonyl)-Nω-methyl-L-lysine (2.94g, 6.45mmol, 98%).
F. 3-(N -fert-Butyloxycarbonyl-Nω-(1,1-dimethyl-2,2,2-trϊchloroethoxycarbonyl)- ΛT-methyl-L-lysiny thiazolidine
Nα-(tert-Butyloxycarbonyl-Nω-(1,1-dimethyl-2,2,2-trichloroethoxycarbonyl)-Nω-methyl-L- lysine (700mg, 1.51 mmol) was dissolved in CH2CI2 /DMF (9:1 , 20mL). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (410mg, 3.0mmol), water-soluble carbodiimide (250mg, 1.3mmol), thiazolidine (170mg, 1.9mmol) and N- methylmorpholine (1.0g, 10mmol). After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (70mL). The solution was washed with 0.3M KHS0 (1 x 25mL), sat. NaHC03 (1 x 25mL), water (1 x 25mL) and brine (1 x 25mL), dried (Na2S0 ) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 50% ethyl acetate, 50% pet. ether) to give a white solid identified as 3-(Nα-fert-butyloxycarbonyl-Nω-(1 ,1-dimethyl- 2,2,2-trichloroethoxycarbonyl)-Λ/ω-methyl-L-lysinyl)thiazolidine (758mg, 1.42mmol, 94%).
G. 3-(N -terf-Butyloxycarbonyl-Nω-methyl-L-lysinyl)thiazolidine
3-(Nα-tert-Butyloxycarbonyl-Nω-(1 , 1 -dimethyl-2,2,2-trichloroethoxycarbonyl)-ΛT-methyl- L-lysinyl)thiazolidine (730mg, 1.36mmol) was dissolved in acetic acid (30mL). Zinc powder (200mg) was added. After stirring at room temperature for 18 hours the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). The solution was washed with sat. NaHC03 (1 x 25mL), water (1 x 25mL) and brine (1 x 25mL), dried (Na2S0 ) and evaporated in vacuo to give a colourless oil identified as 3- (Nα-tert-butyloxycarbonyl-Nω-methyl-L-lysinyl)thiazolidine (438mg, 1.32mmol, 97%).
H. 3-[Nα-fert-Butyloxycarbonyl-Λr-methyl-Nm-(2-napthylmethyl)-L- lysinyl]thiazolidine
3-(Nα-tert-Butyloxycarbonyl-Nω-methyl-L-lysinyl)thiazolidine (50mg, 0.15mmol) was dissolved in 1 ,2-dichloroethane (20mL). To this solution was added 2-naphthaldehyde (26mg, 0.17mmol). After 2 hours sodium triacetoxyborohydride (36mg, 0.17mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 4% methanol, 96% chloroform) to give a colourless oil identified as 3-[Nα-tert- butyloxycarbonyl-Nω-methyl-/Vω-(2-napthylmethyl)-L-lysinyl]thiazolidine (51 mg,
0.11 mmol, 72%).
I. 3-[Λr°-Methyl-Λ -(2-napthylmethyl)-L-lysinyl]thiazolidine dihydrochloride
3-[N -terf-Butyloxycarbonyl-Nω-methyl-ΛT-(2-napthylmethyl)-L-lysinyl]thiazolidine (44mg, 0.093mmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a pale brown solid identified as 3-[Λ/ω-methyl-Λ/t0-(2-napthylmethyl)-L- lysinyljthiazolidine dihydrochloride (37mg, 0.083mmol, 89%).
[M+Hf = 372.2
1H NMR (CD3OD): δ 1.50-1.53 (2H,m), 1.91-1.98 (4H,m), 2.82 (3H,s), 3.08-3.19
(4H,m), 3.36-3.75 (5H,m), 4.32-4.47 (2H,m), 4.60-4.71 (2H,m), 7.55-7.59 (2H,m), 7.65-
7.68 (1 H,m), 7.90-8.00 (3H,m), 8.10-8.12 (1H,m) ppm.
EXAMPLE 9
S-IΛT-Methyl-Λ ^l-Napthylmethy -L-ornithyllthiazolidine dihydrochloride
Figure imgf000025_0001
A. 3-[Λ-(fert-Butyloxycarbonyl)-Oω-methyl-L-glutamyl]thiazolidine
Λ/-(fert-Butyloxycarbonyl)-Oω-methyl-L-glutamic acid (6.28g, 24mmol) was dissolved in CH2CI2/DMF (9:1, 100ml). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (5.5g, 36mmol), water-soluble carbodiimide (5.38g, 28mmol), thiazolidine (2.48g, 28mmol) and N-methylmorpholine (3.0g, 30mmol). The mixture was stirred for 18h at 0°C to room temperature then the solvent was removed in vacuo and the residue was taken up in ethyl acetate (150ml). The solution was washed with 0.3M KHS04 (2 x 30ml), sat. NaHC03 (2 x 30ml), water (2 x 30ml) and brine (1 x 30ml), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 70% ethyl acetate, 30% pet. ether 60-80) to give a brown oil identified as 3-[Λ/-(tert-butyloxycarbonyl)-Oω-methyl-L-glutamyl]thiazolidine (4.0g, 12mmol, 50%).
B. 3-[ V,W-Di-(tert-butyloxycarbonyl)-Oω-methyl-L-glutamyl]thiazolidine
3-[Λ/-(tert-Butyloxycarbonyl)-Oω-methyl-L-glutamyl]thiazolidine (3.2g, 9.6mmol) was dissolved in acetonitrile (20mL). Di-tert-butyl dicarbonate (3.14g, 14.4mmol) and 4- dimethylaminopyridine (235mg, 1.93mmol) were added. After 18 hours at room temperature further di-tert-butyl dicarbonate (3.14g, 14.4mmol) was added. After a further 3 days at room temperature the solvent was evaporated in vacuo the residue was purified by flash chromatography on silica gel (eluant: 70% ethyl acetate, 30% pet. ether 60-80) to give a colourless oil identified as 3-[Λ/,Λ/-di-(tert-butyloxycarbonyl)-Oω- methyl-L-glutamylJthiazolidine (2.0g, 4.63mmol, 48%).
C. 3-[Λ/,W-Di-(fert-butyloxycarbonyl)-L-glutamyl]thiazolidine
3-[Λ/,Λ/-di-(tert-butyloxycarbonyl)-Oω-methyl-L-glutamyl]thiazolidine (950mg, 2.22mmol) was dissolved in THF (50ml). 1M Lithium hydroxide (5.5ml, 5.5mmol) was added. The mixture was stirred for 1 hour at room temperature then the solvent was removed in vacuo and the residue was taken up in ethyl acetate (70ml). The solution was washed with 0.3M KHS04 (2 x 20ml), water (2 x 20ml) and brine (1 x 20ml), dried (Na2S04) and evaporated in vacuo to give a colourless oil identified as 3-[Λ/,/V-di-(tert- butyloxycarbonyl)-L-glutamyl]thiazolidine (912mg, 2.2mmol, 98%).
D. 3-[2-(W,N-Di-(fert-butyloxycarbonyl)amino)-5-hydroxypentanoyl]thiazolidine
3-[Λ/,Λ/-Di-(tert-butyloxycarbonyl)-L-glutamyl]thiazolidine (912mg, 2.2mmol) was dissolved in tetrahydrofuran (30 mL). This solution was cooled to -20 °C, N- methylmorpholine (300mg, 2.96mmol) and isobutyl chloroformate (387mg, 2.83mmol) were added. After 20 mins at -20 °C the reaction mixture was added to a solution of sodium borohydride (182mg, 4.8mmol) in water (5mL) at 0°C. After 1 hour the reaction mixture was diluted with ethyl acetate (150 mL). This solution was washed with water (1 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a colourless oil identified as 3-[2-(Λ/,Λ/-di-(tert-butyloxycarbonyl)amino)-5-hydroxy- pentanoyljthiazolidine (800mg, 2.0mmol, 92%).
E. 3-[2-(Λ,Λ/-Di-(terf-butyloxycarbonyl)amino-5-oxopentanoyl]thiazolidine
3-[2-Λ/,Λ/-( (Di-terf-butyloxycarbonyl)amino)-5-hydroxypentanoyl]thiazolidine (800mg, 2.0mmol) was dissolved in dichloromethane (50 mL). Dess-Martin periodinane (933mg,2.2mmol) was added. After 1 hour at room temperature the reaction mixture was diluted with ethyl acetate (150 mL). This solution was washed with water (1 x 20ml) and brine (1 x 20ml), dried (Na2S04) and evaporated in vacuo to give a colourless oil. Purified by flash chromatography on silica gel (eluant: 50% ethyl acetate, 50% pet. ether 60-80) to give a colourless oil identified as 3-[2-(Λ/,Λ/-di-(tert- butyloxycarbonyl)amino-5-oxopentanoyl]thiazolidine (210mg, 0.52mmol, 26%). F. 3-[W,W-Di-(fert-butyloxycarbonyl-ΛfO-methyl-Λ ω-(1-napthylmethyl)-L-ornithyl]- thiazolidine
3-[Λ/,Λ/-Di-(tert-butyloxycarbonyl)amino-5-oxopentanoyl]thiazolidine was dissolved in 1 ,2-dichloroethane (20mL). To this solution was added N-methyl-1- napthylmethylamine. After 2 hours sodium triacetoxyborohydride was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel to give a colourless oil identified as 3-[Λ/,Λ/-di-(tert-butyloxycarbonyl-ΛT-methyl-/\/ω-(1-napthylmethyl)-L-ornithyl]thiazolidine.
G. S-ΪΛ -Methyl-ΛT-fl-NapthylmethylJ-L-ornithyllthiazolidine dihydrochloride
3-[Λ/,Λ/-Di-(tert-butyloxycarbonyl-Λ/<B-methyl-Λ/ω-(1-napthylmethyl)-L-ornithyl]thiazolidine was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a pale brown solid identified as 3-[Λ -Me,ΛT-(1-napthylmethyl)-L-ornithyl]thiazolidine dihydrochloride.
EXAMPLE 10
3,3-Difluoro-1-[ΛfB-(2-methylbutyl)-L-lysinyl]pyrrolidine dihydrochloride
Figure imgf000027_0001
A. 1 -(te/t-ButyIoxycarbonyl)-3-pyrrolidone
(3f?)-1-(tert-Butyloxycarbonyl)-3-hydroxypyrrolidine (980mg, 5.3mmol) was dissolved in CH2Cl2 (40ml). Dess-Martin periodinane (2.5g, 5.8mmol) was added. The mixture was stirred for 3 hours at room temperature then the solvent was removed in vacuo and the residue was taken up in ethyl acetate (300ml). The solution was washed with sat. NaHC03, water and brine, dried (Na2S0 ) and evaporated in vacuo to give a colourless oil. The residue was purified by flash chromatography on silica gel (eluant: 20% ethyl acetate, 80% pet. ether 60-80) to give a colourless oil identified as 1-(tert- butyloxycarbonyl)-3-pyrrolidone (842mg, 4.6mmol, 87%).
B. 1-(terf-Butyloxycarbonyl)-3,3-difluoropyrrolidine
1-(tert-Butyloxycarbonyl)-3-pyrrolidone (810mg, 4.4mmol) was dissolved in CH2CI2 (30ml). (Diethylamino)sulphur trifluoride (2.2g, 13.7mmol) was added to this solution at 0°C. The mixture was stirred for 18 hours at 0°C to room temperature then carefully poured into sat. NaHC03 (100ml). The mixture was stirred for 15min then extracted with CH2CI2. The organic extract was washed with water and brine, dried (Na2S0 ) and evaporated in vacuo to give an orange oil. The residue was purified by flash chromatography (eluant: 10% ethyl acetate, 90% pet. ether 60-80) to give a colourless oil identified as 1-(tert-butyloxycarbonyl)-3,3-difluoropyrrolidine (580mg, 2.8mmol, 64%).
C. 3,3-Difluoropyrrolidine hydrochloride
1-(tert-Butyloxycarbonyl)-3,3-difluoropyrrolidine (540mg, 2.6mmol) was dissolved in 4M HCI/dioxan (30ml). The solution was stirred for 1 hour at room temperature then the solvent was removed in vacuo to give an off white solid identified as 3,3- difluoropyrrolidine hydrochloride (370mg, 2.6mmol, 100%).
D. l-IΛf-ttert-ButyloxycarbonyO-Λf-tS-fluorenylmethyloxycarbony -L-lysinyll-S.S- difluoropyrrolidine
Λ/α-(fert-Butyloxycarbonyl)-ΛT-(9-fluorenylmethyloxycarbonyl)-L-lysine (1.14g, 2.4mmol) was dissolved in CH CI2 /DMF (9:1, 100ml). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (394mg, 2.9mmol), water-soluble carbodiimide (680mg, 3.4mmol), 3,3-difluoropyrrolidine hydrochloride (380mg, 2.43mmol) and N- methylmorpholine (400mg, 4mmol). The mixture was stirred for 18h at 0°C to room temperature then the solvent was removed in vacuo and the residue was taken up in ethyl acetate (200ml). The solution was washed with 0.3M KHS04, sat. NaHC03, water and brine, dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 65% ethyl acetate, 35% pet. ether 60-80) to give a white solid identified as 1-[Λ/ct-(fert-butyloxycarbonyl)-Λ/ω-(9- fluorenylmethyloxycarbonyl)-L-lysinyl]-3,3-difluoropyrrolidine (1.0g, 1.8mmol, 75%). E. l-JΛP-tfe/t-Butyloxycarbony -L-lysinyll-S.S-difluoropyrrolidine
1-[/\Tx-(tert-ButyloxycarbonyI)-/Vn-(9-fluorenylmethyloxycarbonyl)-L-lysinyl]-3,3-difluoro- pyrrolidine (1.01g, 1.8mmol) was dissolved in THF (20ml). Diethylamine (5ml) was added. The mixture was stirred for 3 hours at room temperature then the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel (eluant: 90% chloroform, 7% methanol, 3% triethylamine) to give a pale yellow oil identified as HΛ/^terf-butyloxycarbony -L-lysinylj-S.S-difluoropyrrolidine (598mg, 1.78mmol, 99%).
F. 1-[Wα-(tert-Butyloxycarbonyl)-Nω-(2-methylbutyl)-L-lysinyl]-3,3-difluoro- pyrrolidine
^[^-(ferf-Butyloxycarbony -L-Iysinylj-S.S-difluoropyrrolidine was dissolved in 1,2- dichloroethane (20mL). To this solution was added 2-methylbutanal. After 2 hours sodium triacetoxyborohydride was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S0 ) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel to give a colourless oil identified as ^[/^-(tert- butyloxycarbonyl)-ΛT-(2-methylbutyl)-L-lysinyl]-3,3-difluoropyrrolidine.
G. 3,3-Difluoro -l-ΪW00 -(2-methyl butyl)-L-lysinyl] pyrrolidine dihydrochloride
1-[Λ/ -(tert-ButyIoxycarbonyl)-Λ/<n-(2-methylbutyl)-L-lysinyl]-3,3-difluoropyrrolidine was dissolved in 4M HCI/dioxan (20ml). The mixture was stirred for 1 hour at room temperature then the solvent was removed in vacuo to give a colourless oil identified as 3,3-difluoro-1-[Λ/ω-(2-methylbutyl)-L-lysinyl]pyrrolidine dihydrochloride.
EXAMPLE 11
1-[Λf°-(3-Cyclohexenylmethyl)-L-lysinyl]thiomorpholine dihydrochloride
Figure imgf000029_0001
A. S-IΛT-tfert-Butyloxycarbony -Λr-tθ-fluorenylmethyloxycarbonylJ-L- lysinyl]thiomorpholine
/Va-(tert-Butyloxycarbonyl)-/\T-(9-fluorenylmethyloxycarbonyl)-L-lysine (2.5g, 5.34mmol) was dissolved in CH2CI2 /DMF (9:1, 100mL). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (1.44g, 10.6mmol), water-soluble carbodiimide (1.35g, 6.5mmol), thiomorpholine (710mg, 6.9mmol) and N-methylmorpholine (800mg, 8mmol). After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (100mL). The solution was washed with 0.3M KHS04 (2 x 25mL), sat. NaHC03 (2 x 25mL), water (2 x 25mL) and brine (1 x 25mL), dried (Na2S0 ) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 75% ethyl acetate, 25% pet. ether) to give a white solid identified as 3-[Λ/α-(tert-butyloxycarbonyl)-ΛT-(9-fluorenylmethyloxycarbonyl)-L- lysinyljthiomorpholine (2.70g, 4.88mmol, 91%).
B. S-ΪΛ/ tert-ButyloxycarbonylJ-L-lysinylJthiomorpholine
3-[Λ/α-(tert-Butyloxycarbonyl)-Λ/ω-(9-fluorenylmethyloxycarbonyl)-L- lysinyljthiomorpholine (2.6g, 4.7mmol) was dissolved in tetrahydrofuran (20mL). Diethylamine (5mL) was added. After 90min at room temperature the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel (eluant: 90% chloroform, 7% methanol, 3% triethylamine) to give a pale yellow oil identified as 3-[Λf-(tert-butyloxycarbonyl)-L-lysinyl]thiomorpholine (1.2g, 3.637mmol, 77%).
C. S-ΪΛ ^fert-Butyloxycarbony -ΛT-tS-cyclohexenylmethy -L-lysinyl]- thiomorpholine
3-(Λ/°-(tert-Butyloxycarbonyl)-L-lysinyl)thiomorpholine (150mg, 0.45mmol) was dissolved in methanol (25mL). To this solution was added 3- cyclohexenecarboxaldehyde (400mg, 0.45mmol). After 30mins sodium triacetoxyborohydride (150mg, 0.71 mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL).
This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1% acetic acid, 9% methanol, 90% chloroform) to give a colourless oil identified as 3-(Λ/α-(tert-butyloxycarbonyl)-Λ/ω-(3- cyclohexenyImethyI)-L-lysinyl)thiomorpholine (66mg, 0.12mmol, 26%). D. 1-[ΛP-(3-CyclohexenyImethyl)-L-lysinyl]thiomorpholine dihydrochloride
3-(Λ/α-(tert-Butyloxycarbonyl)-ΛT-(3-cyclohexenylmethyl)-L-lysinyI)thiomorpholine (66mg, 0.12mmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[ΛT-(3-cyclohexenylmethyl)-L- lysinyljthiomorpholine dihydrochloride (62mg, 0.12mmol, 100%).
[M+H]+ = 326.2
EXAMPLE 12
(2S)-1-[Nω-(2-(3'-trifluoromethylanilino)pyridyl-3-carbonyl)-L-ornithyl]thiazolidϊne dihydrochloride
Figure imgf000031_0001
A. 3-[Nα-fert-Butyloxycarbonyl-Nω-(1 ,1 -dimethyl-2,2,2-trichloroethoxycarbonyl)-L- ornithyl]thiazolidine
Nα-(tert-Butyloxycarbonyl-Nω-(1 ,1-dimethyl-2,2,2-trichloroethoxycarbonyl)-L-ornithine (2.5g, 5.9mmol) was dissolved in CH2CI2 /DMF (9:1, 30mL). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (1.6g, 11.9mmol), water-soluble carbodiimide (1.4g, 7.6mmol), thiazolidine (650mg, 7.3mmol) and N-methylmorpholine (2.0g, 20mmol). After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (70mL). The solution was washed with 0.3M KHS04 (1 x 25mL), sat. NaHC03 (1 x 25mL), water (1 x 25mL) and brine (1 x 25mL), dried (Na S0 ) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 70% ethyl acetate, 30% pet. ether) to give a colourless oil identified as 3-[Nα-tert-butyloxycarbonyl-Nω-(1,1-dimethyl-2,2,2- trichloroethoxycarbonyl)-L-ornithyl]thiazolidine (758mg, 1.42mmol, 94%).
B. 3-(Nα-terf-Butyloxycarbonyl- L-ornithinyl)thiazoIidine
3-[Nα-fert-Butyloxycarbonyl-Nω-(1 ,1-dimethyl-2,2,2-trichloroethoxycarbonyl)-L- ornithyljthiazolidine (130mg, 0.26mmol) was dissolved in acetic acid (30mL). Zinc powder (100mg) was added. After stirring at room temperature for 18 hours the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). The solution was washed with sat. NaHC03 (1 x 25mL), water (1 x 25mL) and brine (1 x 25mL), dried (Na2S04) and evaporated in vacuo to give a colourless oil identified as 3- (Nα-tert-butyloxycarbonyl-L-ornithinyl)thiazolidine (80mg, 0.26mmol, 100%).
C. 3-[Nα-tert-Butyloxycarbonyl-Λω-(2-(3'-trifluoromethylanilino)pyridyl-3- carbonyl)-L-ornithinyl]thiazolidine
3-(Nα-terf-Butyloxycarbonyl-L-ornithinyl)thiazolidine (80mg, 0.26mmol) was dissolved in CH2CI2 /DMF (9:1 , 20mL). To this solution at 0°C was added 1-hydroxybenzotriazole hydrate (80mg, 0.6mmol), water-soluble carbodiimide (65mg, 0.32mmol), niflumic acid (82mg, 0.29mmol) and N-methylmorpholine (100mg, LOmmol). After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (70mL). The solution was washed with 0.3M KHS04 (1 x 20mL), sat. NaHC03 (1 x 20mL), water (1 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 75% ethyl acetate, 25% pet. ether) to give a yellow oil identified as 3-[Nα-tert- butyloxycarbonyl-/\ -(2-(3'-trifluoromethylanilino)pyridyl-3-carbonyl)-L-ornithinyl]- thiazolidine (60mg, 0.12mmol, 45%).
D. (2S)-1-[Λ/ω-(2-(3'-Trifluoromethylanilino)pyridyl-3-carbonyl)-L-ornithyl]- thiazolidine dihydrochloride
3-[Nα-tert-Butyloxycarbonyl-Λ/ω-(2-(3'-trifluoromethylanilino)pyridyl-3-carbonyl)-L- ornithinyljthiazolidine (54mg, O.IOmmol) was dissolved in 4M HCI/dioxan (20mL). After 1 h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a pale brown solid identified as (2S)-1-[Λ/ω-(2-(3'- trifluoromethylanilino)pyridyl-3-carbonyl)-L-ornithyl]thiazolidine dihydrochloride (47mg, O.IOmmol, 100%). [M+H]+ = 468.0
1H NMR (CD3OD): δ1.77-1.82 (2H, m), 1.84-2.00 (2H, m), 3.03-3.15 (4H, m), 3.41-3.51 (2H, m), 3.65-3.71 (2H, m), 3.80-3.87 (1H, m), 4.46-4.49 (2H, m), 4.65-4.72 (2H, m), 7.06-7.11 (1H, m), 7.61-7.11 (3H, m), 7.95 (1H, s), 8.09 (1H, d, J=4.7Hz), 8.49 (1H, d, J= 4.2Hz) ppm.
EXAMPLE 13
3,3-Difluoro-1-[Wt0-(2-(3'-chloroanilino)pyridyl-3-carbonyl)-L-ornithyl]pyrrolidine dihydrochloride
Figure imgf000033_0001
A. l-IΛP-ttert-Butyloxycarbony -L-ornithyll-S^-difluoropyrrolidine
^[/^-(tert-Butyloxycarbony -L-ornithylj-S.S-difluoropyrrolidine was prepared as described for the lysine derivative in Example 9.
B. 3-Chloroanilinonicotinic acid
3-Chloroaniline was dissolved in xylene. 2-Aminonicotinic acid was added. The reaction mixture was heated at 150 °C for 18 hours after which time the reaction mixture was diluted with ethyl acetate giving an off-white solid identified as 3- chloroanilinonicotinic acid.
C. 3,3-Difluoro-[Nα-tert-butyloxycarbonyl-Λf°-(2-(3'-chloroanilino)pyridyl-3- carbonyl)-L-ornithinyI]pyrrolidine
^[/^-(tert-Butyloxycarbony -L-ornithylj-S.S-difluoropyrrolidine was dissolved in CH2CI2 /DMF (9:1 , 20mL). To this solution at 0°C was added 1-hydroxybenzotriazole hydrate, water-soluble carbodiimide, 3-chloroanilinonicotinic acid and N-methylmorpholine. After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (70mL). The solution was washed with 0.3M KHS04 (1 x 20mL), sat. NaHC03 (1 x 20mL), water (1 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 75% ethyl acetate, 25% pet. ether) to give a yellow oil identified as 3,3-difluoro-[Nα-tert-butyloxycarbonyl-ΛT-(2-(3'- chloroanilino)pyridyl-3-carbonyl)]-L-ornithinyl)pyrrolidine.
D. 3,3-Difluoro-1-[ΛT-(2-(3'-chloroanilino)pyridyl-3-carbonyl)-L- ornithyljpyrrolidine dihydrochloride
3,3-Difluoro-[Na-tert-butyloxycarbonyl-/\T-(2-(3'-chloroanilino)pyridyl-3-carbonyl)]-L- ornithinyl)pyrrolidine was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a pale brown solid identified as 3,3-difluoro-1-[Λ/ω-(2-(3'- chloroanilino)pyridyl-3-carbonyl)-L-omithyl]pyrrolidine dihydrochloride.
EXAMPLE 14
3-[Neo-6-Chloro-4-(2',5'-dichloroanilino)-1,3,5-triazinyl)-L-lysinyl]thiazolidine dihydrochloride
Figure imgf000034_0001
A. 4,6-Dichloro-2-(2',5'-dichloroanilino)-1 ,3,5-triazine
Cyanuric chloride (1.844g, 10mmol) was dissolved in acetonitrile (20mL). The solution was cooled to -20 °C. A solution of 2,5-dichloroaniline (1.62g, 10mmol) and triethylamine (1.0g, 10mmol) was slowly added. After 1 hour at -20 °C the solvent was removed in vacuo and the residue was taken up in ethyl acetate (150mL). The solution was washed with water (1 x 50mL) and brine (1 x 50mL), dried (Na2S04) and evaporated in vacuo. The residue was recrystallised from ethyl acetate/ hexane to give an off white solid identified as 4,6-dichloro-2-(2',5'-dichloroanilino)-1 ,3,5-triazine (1.86mg, 6.0mmol, 60%).
B. S-CN^tert-Butyloxycarbonyl-Λ -β-chloro^^'.δ'-dichloroanilinoJ-I.S.δ- triazinyl)-L-lysinyl]thiazolidine
3-(Λ/ct-(tert-Butyloxycarbonyl)-L-lysinyl)thiazolidine (800mg, 2.58mmol) was dissolved in dichloromethane (30mL). To this solution was added 4,6-dichloro-2-(2',5'- dichloroanilino)-1 ,3,5-triazine (810mg, 2.6mmol) and triethylamine (300mg, 3.0mmol). After 2 hours at room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (150mL). This solution was washed with water (2 x 30mL) and brine (1 x 30mL), dried (Na2S0 ) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography (eluant: 60% ethyl acetate, 40% pet. ether) to give a white solid identified as 3-[Nα-tert-butyloxycarbonyl-Λ/ω-6-chloro-4- (2',δ'-dichloroanilino)-1 ,3,δ-triazinyl)-L-lysinyl]thiazolidine (1.33g, 2.23mmol, 86%).
C. 3-[ΛT>>-6-Chloro-4-(2',δ'-dichloroanilino)-1,3,5-triazinyl)-L-lysinyl]thiazolidine dihydrochloride
3-[Nα-fert-Butyloxycarbonyl-Λ/ω-6-chIoro-4-(2',δ'-dichloroanilino)-1,3,δ-triazinyl)-L- lysinyljthiazolidine (59mg, O.IOmmol) was dissolved in 4M HCI/dioxan (20mL). After
1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 3-[Λ/ω-6-chloro-4-(2',5'- dichloroanilino)-1,3,5-triazinyl)-L-lysinyl]thiazolidine dihydrochloride (55mg, 0.098mmol,
98%).
[M+Hf = 492.2, 494.4
1H NMR (CD3OD): δ1.46-1.51 (2H,m), 1.65-1.67 (2H,m), 1.80-1.96 (2H,m), 3.05-3.14
(2H,m), 3.38-3.42 (2H,m), 3.56-3.75 (4H,m), 4.31-4.36 (2H,mO, 4.40-4.52 (1H,m), 4.63-
4.95 (2H,m), 7.15-7.18 (1H,m), 7.40-7.45 (1H,m), 8.15-8.25 (1H,m) ppm.
EXAMPLE 15
3-[Λ/ω-4-(2',5'-Dichloroanilino)-6-hydroxy-1,3,5-triazinyl)-L-lysinyl]thiazolidine bis(trif I uoroacetate)
Figure imgf000036_0001
A. S-ΪΛP^^'jδ'-DichloroanilinoJ-e-hydroxy-I.Sjδ-triaziny -L-lysinyllthiazolidine bis(trifluoroacetate)
3-[Nα-tert-Butyloxycarbonyl-Λ/ω-6-chloro-4-(2',5'-dichIoroanilino)-1 ,3,5-triazinyl)]-L- ornithinyl)thiazolidine (54mg, 0.09mmol) was dissolved in trifluoroacetic acid (20mL) and water (2mL). After 2 hours at 70 °C the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 3-[ΛT-4-(2',5'- dichloroaniIino)-6-hydroxy-1 ,3,δ-triazinyl)-L-lysinyI]thiazolidine bis(trifluoroacetate)
(63mg, 0.089mmol, 97%).
[M+H]+ = 472.1 , 474.2
1H NMR (CD3OD): δ1.42-1.47 (2H,m), 1.62-1.67 (2H,m), 1.82-1.89 (2H,m), 3.04-3.16
(4H,m), 3.70-3.75 (2H,m), 3.84-3.91 (1H,m), 4.25-4.32 (2H,m), 4.45-4.54 (2H,m), 4.64-
4.70 (2H,m), 7.05-7.15 (1H,m), 7.34-7.38 (1H,m), 7.49-7.55 (1H,m), 7.80-7.92 (1H,m) ppm.
EXAMPLE 16
3-[ΛfB-4-(2',5'-Dichloroanilino)-6-methylamino-1,3,5-triazinyl)-L-lysinylJthiazolidine dihydrochloride
Figure imgf000037_0001
A. S-IN^tert-Butyloxycarbonyl-Λf^^ δ'-dichloroanilinoJ-δ-dimethylamino-I.S.δ- triazinyl)-L-lysinyl]thiazolidine
3-[Nα-tert-Butyloxycarbonyl-ΛT-3-chloro-5-(2',5'-dichloroanilino)-2,4,6-triazinyl)]-L- omithinyl)thiazolidine (120mg, 0.20mmo_) was dissolved in 1M dimethylamine in tetrahydrofuran (25mL). After 18 hours at room temperature the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel (eluant: 70% ethyl acetate, 30% pet. ether) to give a white solid identified as 3-[Nα-ferf- butyloxycarbonyl-Λ/ω-4-(2',5'-dichloroanilino)-6-dimethylamino-1,3,5-triazinyl)-L- lysinyljthiazolidine (110mg, 0.18mmol, 90%).
B. 3-[ W°-4-(2',5'-Dichloroanilino)-6-dimethylamino-1 ,3,δ-triazinyl)-L-lysinyl]- thiazolidine dihydrochloride
3-[Nα-tert-Butyloxycarbonyl-ΛT-4-(2',5'-dichloroanilino)-6-dimethylamino-1 ,3,5-triazinyl)- L-lysinyl]thiazolidine (110mg, 0.18mmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 3-[A -4-(2',5'-dichloroanilino)-6- dimethylamino-1 ,3,5-triazinyl)-L-lysinyl]thiazolidine dihydrochloride (105mg, 0.18mmol, 100%).
[M+H]+ = 499.1 , 501.1 1H NMR (CD3OD): δ1.52-1.55 (2H,m), 1.69-1.71 (2H,m), 1.90-1.98 (2H,m), 3.13-3.22 (8H,m), 3.48-3.62 (2H,m), 3.65-3.69 (4H,m), 4.37-4.39 (2H,m), 4.46-4.49 (1H,m), 4.57- 4.77 (2H,m), 7.20-7.22 (1H,m), 7.45-7.50 (1 H,m), 8.09-8.12 (1H,m) ppm.
The following compounds were prepared by analogous methods.
Figure imgf000038_0001
Figure imgf000038_0003
TABLE 2
Figure imgf000038_0002
Figure imgf000039_0002
TABLE 3
Figure imgf000039_0001
Figure imgf000039_0003
Figure imgf000040_0001
Figure imgf000041_0001
Figure imgf000042_0001
Figure imgf000043_0001
Figure imgf000044_0001
Figure imgf000045_0001
Figure imgf000046_0001
Figure imgf000047_0001
Figure imgf000048_0001
Figure imgf000049_0001
Figure imgf000050_0001
Figure imgf000051_0001
Figure imgf000052_0001
Figure imgf000053_0001
Figure imgf000053_0002
Figure imgf000054_0001
Figure imgf000055_0001
Figure imgf000056_0001
Figure imgf000057_0001
Figure imgf000058_0001
Figure imgf000059_0001
Figure imgf000060_0001
Figure imgf000061_0002
TABLE 4
Figure imgf000061_0001
Figure imgf000062_0001
Figure imgf000063_0002
TABLE 5
Figure imgf000063_0001
Figure imgf000063_0003
Figure imgf000064_0001
TABLE 6
Figure imgf000065_0001
Figure imgf000065_0002
Figure imgf000066_0002
Figure imgf000066_0001
Figure imgf000067_0001
Figure imgf000068_0002
TABLE 8
HO
Figure imgf000068_0001
Figure imgf000068_0003
Figure imgf000069_0002
EXAMPLE 1277
1-[2-(S)-Amino-4-(cyclohexylmethylamino)butanoyl]thiomorpholine dihydrochloride
A. 1 -[2-(S)-N-(ferf-Butyloxycarbonyl)amino-4-(9- fluorenylmethyloxycarbonylamino)-butanoyl]thiomorpholine
1-[2-(S)-N-(tert-Butyloxycarbonyl)amino-4-(9-fluorenylmethyloxycarbonylamino)- butanoic acid (1.0g, 2.27mmol) was dissolved in CH2CI2 /DMF (9:1 , 20mL). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (461 mg, 3.41 mmol), water- soluble carbodiimide (521 mg, 2.72mmol), thiomorpholine (281 mg, 2.72mmol) and triethylamine (340mg, 3.4mmol). After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (100mL). The solution was washed with 0.3M KHS04 (2 x 25mL), sat. NaHC03 (2 x 25mL), water (2 x 25mL) and brine (1 x 25mL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 75% ethyl acetate, 25% pet. ether) to give a white solid identified as 1-[2-(S)-N-(fert-butyloxycarbonyl)amino- 4-(9- fluorenylmethyloxycarbonylamino)-butanoyl]thiomorpholine (516mg, 0.98mmol, 43%).
B. 1-[2-(S)-/V-(fert-Butyloxycarbonyl)-4-amino)-butanoyl]thϊomorpholine
1-[2-(S)-N-(te/f-Butyloxycarbonyl)amino- 4-(9-fluorenylmethyloxycarbonylamino)- butanoyl thiomorpholine (500mg, 0.95mmol) was dissolved in tetrahydrofuran (20mL). Diethylamine (5mL) was added. After 90min at room temperature the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel (eluant: 90% chloroform, 7% methanol, 3% triethylamine) to give a pale yellow oil identified as 1 -[2-(Sj-N-(ferf-butyloxycarbonyl)-4-amino)-butanoyl]thiomorpholine (162mg, 0.54mmol, 56%).
C. 1-[2-(S)-N-(fert-Butyloxycarbonyl)-amino-4-(cyclohexylmethylamino)butanoyl] thiomorpholine
1-[2-(S)-N-(fert-Butyloxycarbonyl)-4-amino)-butanoyl]thiomorpholine (41mg, 0.135mmol) was dissolved in dichloroethane (10mL). To this solution was added cyclohexanecarboxaldehyde (1δmg, 0.135mmol). After 30mins sodium triacetoxyborohydride (32mg, 0.15mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S0 ) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1% acetic acid, 9% methanol, 90% chloroform) to give a colourless oil identified as 1-[2-(S)-N-(terf-butyloxycarbonyl)-amino-4- (cyclohexylmethylamino)butanoyl] thiomorpholine (25mg, 0.063mmol, 47%).
D. 1-[2-(S)-Amino-4-(cyclohexylmethylamino)butanoyl]thiomorpholine dihydrochloride
1-[2-(S)-N-(terf-Butyloxycarbonyl)-amino-4-
(cyclohexylmethylamino)butanoyl]thiomorpholine (25mg, 0.063mmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[2- (S)-amino-4-(cyclohexylmethylamino)butanoyl]thiomorpholine dihydrochloride (23mg, 0.063mmol, 100%).
[M+H]* = 300.3
EXAMPLE 1278
1-[2-(S)-Amino-4-((quinolin-2-ylmethyl)amino)butanoyl]thiomorpholine dihydrochloride
Figure imgf000071_0001
A. 1 -[2-(S)-N-(teιt-Butyloxycarbonyl)-amino-4-((quinolin-2- ylmethyl)amino)butanoyl thiomorpholine
1-[2-(S)-N-(terf-Butyloxycarbonyl)-4-amino)-butanoyl]thiomorpholine (41 mg, 0.135mmol) was dissolved in 1 ,2-dichloroethane (10mL). To this solution was added 2-quinolinecarboxaldehyde (32mg, O.lδmmol). After 30mins sodium triacetoxyborohydride (36mg, 0.17mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S0 ) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1% acetic acid, 9% methanol, 90% chloroform) to give a colourless oil identified as 1-[2-(S)-N-(te/f-butyloxycarbonyl)-amino-4-((quinolin- 2-ylmethyl)amino)butanoyl thiomorpholine (32mg, 0.072mmol, 53%).
B. l-[2-(S)-Amino-4-((quinolin-2-ylmethyl)amino)butanoyl]thiomorpholine dihydrochloride
1-[2-(S)-N-(terf-Butyloxycarbonyl)-amino-4-((quinolin-2-ylmethyl)amino)butanoyl] thiomorpholine (12mg, 0.027mmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[2-(S)-amino-4-((quinolin-2- ylmethyl)amino)butanoyl]thiomorpholine dihydrochloride (11.3mg, 0.027mmol, 100%).
[M+H]+ = 345.3
EXAMPLE 1279 1-[2-(S)-Amino-4-(cyclohexylmethylamino)butanoyl]piperidine dihydrochloride
Figure imgf000072_0001
A. 1 -[2-(S)-N-(terf-Butyloxycarbonyl)amino-4-(9- fluorenylmethyloxycarbonylamino)-butanoyl] piperidine
1-[2-(S)-N-(fert-Butyloxycarbonyl)amino-4-(9-fluorenylmethyIoxycarbonylamino)- butanoic acid (947mg, 2.154mmol) was dissolved in CH2CI2 /DMF (9:1 , 20mL). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (436mg, 3.2mmol), water- soluble carbodiimide (495g, 2.58mmol), piperidine (220g, 2.58mmol) and triethylamine (320mg, 3.2mmol). After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (100mL). The solution was washed with 0.3M KHS04 (2 x 25mL), sat. NaHC03 (2 x 25mL), water (2 x 25mL) and brine (1 x 25mL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 75% ethyl acetate, 25% pet. ether) to give a white solid identified as 1-[2-(S)-N-(fert-butyIoxycarbonyl)amino- 4-(9- fluorenylmethyloxycarbonylamino)-butanoyl]piperidine (556mg, 1.1 mmol, 51%).
B. 1-[2-(S W-(tert-Butyloxycarbonyl)-4-amino)-butanoyl]piperidine
1-[2-(S)-N-(terf-Butyloxycarbonyl)amino- 4-(9-fluorenylmethyloxycarbonylamino)- butanoyl] piperidine (540g, 1.1 mmol) was dissolved in tetrahydrofuran (20mL). Diethylamine (5mL) was added. After 90min at room temperature the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel (eluant: 90% chloroform, 7% methanol, 3% triethylamine) to give a pale yellow oil identified as 1-[2-(S)-N-(terf-butyloxycarbonyl)-4-amino)-butanoyl] piperidine (171mg, O.δmmol, 57%).
C. 1-[2-(S)-N-(fe/ -Butyloxycarbonyl)-amino-4-(cyclohexylmethylamino)butanoyl] piperidine
1-[2-(S)-N-(terf-Butyloxycarbonyl)-4-amino)-butanoyl] piperidine (43mg, 0.15mmol) was dissolved in 1 ,2-dichloroethane (20mL). To this solution was added cyclohexanecarboxaldehyde (17mg, 0.15mmol). After 30mins sodium triacetoxyborohydride (36mg, 0.17mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1% acetic acid, 9% methanol, 90% chloroform) to give a colourless oil identified as 1-[2-(S)-N-(ferf-butyloxycarbonyl)-amino-4- (cyclohexylmethylamino)butanoyl]piperidine (38mg, 0.1 mmol, 66%).
D. 1-[2-(S)-Amino-4-(cyclohexylmethylamino)butanoyl] piperidine dihydrochloride
1-[2-(S)-N-(ferf-Butyloxycarbonyl)-amino-4-(cycIohexylmethylamino)butanoyl]pipehdine (38mg, 0.1 mmol) was dissolved in 4M HCI/dioxan (2mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[2-(S)-amino-4- (cyclohexylmethylamino)butanoyl] piperidine dihydrochloride (33mg, 0.093mmol, 93%).
[M+H]+ = 282.3
EXAMPLE 1280
1-[2-(S)-Amino-4-((quinolin-2-ylmethyl)amino)butanoyl]piperidine dihydrochloride
Figure imgf000074_0001
A. 1 -[2-(S)-N-(terf-Butyloxycarbonyl)-amino-4-((quinolin-2- ylmethyl)amino)butanoyl] piperidine
1-[2-(S)-N-(ferf-Butyloxycarbonyl)-4-amino)-butanoyl] piperidine (24mg, 0.15mmol) was dissolved in 1 ,2-dichloroethane (25mL). To this solution was added 2- quinolinecarboxaldehyde (24mg, 0.15mmol). After 30mins sodium triacetoxyborohydride (36mg, 0.17mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1% acetic acid, 9% methanol, 90% chloroform) to give a colourless oil identified as 1-[2-(S)-N-(ferf-butyloxycarbonyl)-amino-4-((quinolin- 2-ylmethyl)amino)butanoyl] piperidine (35mg, 0.082mmol, 56%).
B. l-[2-(S)-Amino-4-((quinolin-2-ylmethyl)amino)butanoyl] piperidine dihydrochloride
1-[2-(S)-N-(fetf-Butyloxycarbonyl)-amino-4-((quinolin-2-ylmethyI)amino)butanoyl] piperidine (35mg, 0.082mmol) was dissolved in 4M HCI/dioxan (2mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[2-(S)-amino-4-((quinolin-2- yImethyl)amino)butanoyI] piperidine dihydrochloride (26mg, 0.065mmol, 79%).
[M+H]+ = 327.3
EXAMPLE 1281
3-Fluoro-1-[2-(S)-amino-4-(cyclohexenylmethylamino)butanoyl]pyrrolidine dihydrochloride
Figure imgf000075_0001
A. 1 -(terf-Butyloxycarbonyl)-3-f luoropyrrolidine
N-(fert-Butyloxycarbonyl)-3-hydroxypyrrolidine (21.0g, 10.7mmol) was dissolved in CH2CI2 (30ml). (Diethylamino)sulphur trifluoride (1.72g, 10.7mmol) was added to this solution at -78 °C. The mixture was stirred for 18 hours at -78 °C to room temperature then the reaction mixture was carefully poured into sat. NaHC03 (100ml) and stirred for 15min and extracted with CH2CI2. The organic extract was washed with water and brine, dried (Na2S04) and evaporated in vacuo to give an orange oil. The residue was purified by flash chromatography (eluant: 28% ethyl acetate, 72% pet. ether 60-80) to give a colourless oil identified as 1-(fert-butyloxycarbonyl)-3-fluoropyrrolidine (1.14g, δ.34mmol, 50%).
B 3-Fluoropyrrolidine hydrochloride
1-(tert-Butyloxycarbonyl)-3-fluoropyrrolidine (1.14g, 5.34mmol) was dissolved in 4M HCI/dioxan (30ml). The mixture was stirred for 1 hour at room temperature then the solvent was removed in vacuo to give an off-white solid identified as 3-fluoropyrrolidine hydrochloride (640mg, 5.2mmol, 96%).
C. 3-Fluoro-1-[2-(S)-N-(ferf-butyloxycarbonyl)amino-4-(9- fluorenylmethyloxycarbonylamino)-butanoyl] pyrrolidine
1-[2-(S)-N-(terf-Butyloxycarbonyl)amino-4-(9-fluorenylmethyloxycarbonylamino)- butanoic acid (950mg, 2.15mmol) was dissolved in CH2CI2 /DMF (9:1 , 20mL). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (395mg, 2.6mmol), water- soluble carbodiimide (572mg, 3.0mmol), 3-fluoropyrrolidine hydrochloride (270g, 2.15mmol) and triethylamine (320mg, 3.2mmol). After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (100mL). The solution was washed with 0.3M KHS04 (2 x 25mL), sat. NaHC03 (2 x 25mL), water (2 x 2δmL) and brine (1 x 2δmL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 76% ethyl acetate, 25% pet. ether) to give a white solid identified as 3-fluoro1-[2-(S)-N-(terf- butyloxycarbonyl)amino- 4-(9-fluorenylmethyloxycarbonylamino)-butanoyl]pyrrolidine (808mg, 1.58mmol, 73%).
D. 3-FIuoro-1-[2-fS W-(tert-butyloxycarbonyl)-4-amino)-butanoyl]pyrrolidine
3-Fluoro-1-[2-(S)-N-(fert-butyloxycarbonyl)amino- 4-(9- fluorenylmethyloxycarbonylamino)-butanoyl] pyrrolidine (800mg, 1.58mmol) was dissolved in tetrahydrofuran (20mL). Diethylamine (5mL) was added. After 90min at room temperature the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel (eluant: 90% chloroform, 7% methanol, 3% triethylamine) to give a pale yellow oil identified as 3-fluoro-1-[2-(S)-N-(tert- butyloxycarbonyl)-4-amino)-butanoyl] pyrrolidine (316mg, 1.04mmol, 66%).
E. 3-Fluoro-1 -[2-(S)-N-(fe/f-butyloxycarbonyl)-amino-4- (cyclohexenylmethylamino)butanoyl] pyrrolidine
3-Fluoro-1-[2-(S)-N-(ferf-butyloxycarbonyl)-4-amino)-butanoyl] pyrrolidine (150mg, 0.52mmol) was dissolved in methanol (20mL). To this solution was added 3- cyclohexenecarboxaldehyde (63mg, 0.57mmol). After 30mins sodium triacetoxyborohydride (220mg, 1.04mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1% acetic acid, 9% methanol, 90% chloroform) to give a colourless oil identified as 3-fluoro-1-[2-(S)-N-(ferf-butyloxycarbonyl)-amino-4- (cyclohexenylmethylamino)butanoyl]pyrrolidine (176mg, 0.46mmol, 77%). F. 3-Fluoro-1-[2-(S)-amino-4-(cyclohexenylmethylamino)butanoyl] pyrrolidine dihydrochloride
3-Fluoro-1-[2-(S)-N-(ten'-butyloxycarbonyl)-amino-4-
(cyclohexenylmethylamino)butanoyl]pyrrolidine (176mg, 0.46mmol) was dissolved in 4M HCI/dioxan (2mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 3- fluoro-1-[2-(S)-amino-4-(cyclohexenylmethylamino)butanoyl] pyrrolidine dihydrochloride (140mg, 0.39mmol, 963%).
[M+H]+ = 284.3
EXAMPLE 1282 l-[2-(S)-Amino-4-(N-methyl-N-(2-methylbenzyl)amino)butanoyl]piperidine dihydrochloride
Figure imgf000077_0001
A. W-(terf-Butyloxycarbonyl)-L-homoserine lactone
L-Homoserine lactone 1.76g, 12.8mmol) was dissolved in DMF (30 mL). This solution was cooled to 0 °C, triethylamine (1.41 , 14.1 mmol) di-tert-butyl dicarbonate(3.35g, 15.35 mmol) was added. After 18 hours at room temperature the solvent was evaporated in vacuo, the residue was taken up in dichloromethane (200 mL). This solution was washed with 1M KHS04 (2 x 50mL) and brine (1 x 50mL), dried (Na2S04) and evaporated in vacuo to give a white solid, recrystallised from EtOAc/pet.ether to give a white solid identified as Λ/-(ferf-butyloxycarbonyl)-L-homoserine lactone (2.25mg, 11.2mmol, 87%).
B. 1-[2-(S)-(N-(fert-Butyloxycarbonyl)amino)-4-hydroxybutanoyl]piperidine
Λ/-(terf-Butyloxycarbonyl)-L-homoserine lactone (100mg, O.δmmol) was dissolved in tetrahydrofuran (30 mL). Piperidine (42mg, O.δmmol) was added. After 72 hours at room temperature the reaction mixture was diluted with ethyl acetate (1δ0 mL). This solution was washed with water (1 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil identified as 1-[2-(S)-(Λ/-(te/t- butyloxycarbonyl)amino)-4-hydroxybutanoyl]piperidine (142mg, O.δmmol, 100%).
C. 1-[2-(S)-(Λ/-(tert-Butyloxycarbonyl)amino)-4-oxobutanoyl] piperidine
1-[2-(S)-(Λ/-(ferf-Butyloxycarbonyl)amino)-4-hydroxybutanoyl] piperidine (142mg, O.δmmol) was dissolved in dichloromethane (60 mL). Dess-Martin periodinane (232mg, O.δmmol) was added. After 1 hour at room temperature the reaction mixture was diluted with ethyl acetate (1δ0 mL). This solution was washed with water (1 x 20ml) and brine (1 x 20ml), dried (Na2S0 ) and evaporated in vacuo to give a colourless oil. Purified by flash chromatography on silica gel (eluant: 50% ethyl acetate, 50% pet. ether 60-80) to give a colourless oil identified as l-[2-(S)-(N-(tert- butyloxycarbonyl)amino)-4-oxobutanoyl] piperidine (40mg, 0.14mmol, 27%).
D. 1-[2-(S)-(W -(te/f-butyloxycarbony amino-4-(N-methyl-N-(2- methylbenzyl)amino) butanoyl]piperidine
1-[2-(S)-(Λ/-(ferf-Butyloxycarbonyl)amino)-4-oxobutanoyl] piperidine (40mg, 14mmol) was dissolved in methanol (20mL). To this solution was added N-methyl-2- methylbenzylamine (19mg, 0.14mmol). After 2 hours sodium triacetoxyborohydride (64mg, 0.3mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel to give a colourless oil identified as 1-[2-(S)-(Λ/-(tert-butyloxycarbonyl)amino-4-(N- methyl-N-(2-methylbenzyl)amino) butanoyl] piperidine (36mg, 0.09mmol, 64%).
E. 1 -[2-(S)-Amino-4-(N-methyl-N-(2-methylbenzyl)amino)butanoyl] piperidine dihydrochloride
1-[2-(S)-(Λ/-(ferf-ButyloxycarbonylJamino-4-(N-methyl-N-(2-methylbenzyl)amino) butanoyl] piperidine (36mg, 0.09mmol)was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a pale brown solid identified as 1-[2-(S)-amino-4-(N- methyl-N-(2-methylbenzyI)amino)butanoyl] piperidine dihydrochloride (43mg, 0.09mmol, 100%)
EXAMPLE 1283 l-[N-(2"-(CyclohexylmethyIaminoethyl)glycinyl)]thiomorphoIine dihydrochloride
Figure imgf000079_0001
A. 1-[N-2'-(fert-Butyloxycarbonyl)-N-(2"-(9-fluorenylmethyIoxycarbonyl aminoethyl)-glycinyl]thiomorpholine
N-2 -(te/f-Butyloxycarbonyl)-N-(2"-(9-fluorenylmethyloxycarbonyl aminoethyI)-glycine (2.δg, 5.7mmol) was dissolved in CH2CI2 /DMF (9:1 , 100mL). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (833mg, 6.3mmol), water-soluble carbodiimide (974mg, 6.3mmol), thiomorpholine (617mg, 6.0mmol) and N- methylmorpholine (800mg, δmmol). After 18h at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (100mL). The solution was washed with 0.3M KHS04 (2 x 25mL), sat. NaHC03 (2 x 2δmL), water (2 x 2δmL) and brine (1 x 2δmL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 7δ% ethyl acetate, 2δ% pet. ether) to give a white solid identified as 1-[N-2x-(terf-butyIoxycarbonyl)-N-(2"-(9- fluorenylmethyloxycarbonyl aminoethyl)-glycinyl]thiomorpholine (2.7g, 5.1 mmol, 90%).
B. 1-[N-2 terf-Butyloxycarbonyl)-(2"-aminoethyl)-glycinyl] thiomorpholine
1-[N-2 -( erf-ButyIoxycarbonyl)-N-(2"-(9-fluorenylmethyloxycarbonyl aminoethyl)- glycinyl]thiomorpholine (2.7g, 5.1 mmol) was dissolved in tetrahydrofuran (20mL). Diethylamine (5mL) was added. After 90min at room temperature the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel (eluant: 90% chloroform, 7% methanol, 3% triethylamine) to give a pale yellow oil identified as 1-[N-2x-(tert-butyloxycarbonyl)-(2"-aminoethyl)-glycinyl] thiomorpholine (1.44g, 4.7mmol, 92%). C. 1-[2 -N-(tert-Butyloxycarbonyl N-(2"-(cyclohexylmethylaminoethyl)-glycinyl] thiomorpholine
1-[N-2"-(ferf-Butyloxycarbonyl)-(2"-aminoethyl)-glycinyl] thiomorpholine (100mg, 0.3mmol) was dissolved in methanol (2δmL). To this solution was added cyclohexanecarboxaldehyde (34mg, 0.3mmol). After 30mins sodium triacetoxyborohydride (126mg, 0.6mmol) was added. After 18h at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1% acetic acid,9% methanol, 90% chloroform) to give a colourless oil identified as 1-[2'-N-(terf-Butyloxycarbonyl N-(2"- (cyclohexylmethylaminoethyl)-glycinyl] thiomorpholine (33mg, O.Oδmmol, 27%).
D. l-[Ν-(2"-(Cyclohexylmethylaminoethyl)glycinyl)]thiomorpholine dihydrochloride
1-[2"-N-(fetf-Butyloxycarbonyl-N-(2"-(cyclohexylmethylaminoethyl)-glycinyl] thiomorpholine (33mg, 0.081 mmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[Ν-(2"- (cyclohexylmethylaminoethyl)glycinyl)]thiomorpholine dihydrochloride (31 mg,
O.Oδmmol, 100%).
[M+H]+ = 300.3
EXAMPLE 1284 l-[N-(2"-((QuinoIin-2-ylmethyl)aminoethyl)glycinyl)]pyrrolidine dihydrochloride
Figure imgf000080_0001
A. 1-[N-2,-(feιt-Butyloxycarbonyl)-N-(2"-(9-fluorenylmethyloxycarbonyl aminoethyl)-glycinyl]piperidine
N-2'-(fert-Butyloxycarbonyl)-N-(2"-(9-fluorenylmethyloxycarbonyI aminoethyl)-glycine (2.δg, δ.7mmol) was dissolved in CH2Cl2 /DMF (9:1 , 100mL). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (1.δg, 11.1 mmol), water-soluble carbodiimide (1.3g, 6.8mmoI), piperidine (484mg, δ.69mmol) and N-methylmorpholine (800mg, δmmol). After 1δh at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (100mL). The solution was washed with 0.3M KHSO4 (2 x 2δmL), sat. NaHC03 (2 x 2δmL), water (2 x 25mL) and brine (1 x 2δmL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 7δ% ethyl acetate, 26% pet. ether) to give a white solid identified as 1-[N-2'-(ferf-butyloxycarbonyl)-N-(2"-(9- fluorenylmethyloxycarbonyl aminoethyl)-glycinyl]piperidine (2.δg, δ.δmmol, 96%).
B. 1-[N-2x-(fert-Butyloxycarbonyl)-(2"-aminoethyl)-glycinyl] piperidine
1-[N-2,-( ert-Butyloxycarbonyl)-N-(2"-(9-fluorenylmethyloxycarbonyl aminoethyl)- glycinyljpiperidine (2.δg, δ.δmmol) was dissolved in tetrahydrofuran (20mL). Diethylamine (δmL) was added. After 90min at room temperature the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel (eluant: 90% chloroform, 7% methanol, 3% triethylamine) to give a pale yellow oil identified as 1-[N-2,-(ferf-butyloxycarbonyl)-(2"-aminoethyl)-glycinyI] piperidine (1.4g, 4.9mmol, 69%).
C. 1-[2 -N-(tert-ButyIoxycarbonyl N-(2"-((quinolin-2-ylmethyl)aminoethyl)- glycinyl] piperidine
1-[N-2Λ-(tert-ButyloxycarbonyI)-(2"-aminoethyl)-glycinyl] piperidine was dissolved in methanol (2δmL). To this solution was added 2-quinoIinecarboxaIdehyde. After 30mins sodium triacetoxyborohydride was added. After 1δh at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 1% acetic acid, 9% methanol, 90% chloroform) to give a colourless oil identified as 1-[2<-N-(ferf-butyloxycarbonyl N-(2"-((quinolin-2- ylmethyl)aminoethyl)-glycinyl] piperidine. D. l-[N-(2"-((Quinolin-2-ylmethyl)aminoethyl)glycinyI)]piperidine dihydrochloride
1-[2>-N-(tert-Butyloxycarbonyl-N-(2"-((quinolin-2-ylmethyl)aminoethyl)-glycinyl] piperidine was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[Ν-(2"-((quinolin-2-ylmethyl)aminoethyl)glycinyl)]piperidine dihydrochloride.
EXAMPLE 1285 l-[N,N-(2",2"-((Dicinnamyl)aminoethyl)gIycinyl)]thiomorpholine dihydrochloride
Figure imgf000082_0001
A. 1-[2 -N-(fe/f-Butyloxycarbonyl N,N-(2",2,,-((dicinnamyl)aminoethyl)-glycinyl] thiomorpholine
(2S)-1-(Λ/α-(te/f-Butyloxycarbonyl)-L-lysinyl)-pyrrolidine-2-carbonitrile (2δ0mg,
O.δ3mmol) was dissolved in dichloroethane (2δmL). To this solution was added trans- cinnamaldehyde (10δmg, O.δ3mmol). After 30mins sodium triacetoxyborohydride (350mg, 1. δmmol) was added. After 1δh at room temperature the solvent was removed in vacuo and the residue was taken up in chloroform (70mL). This solution was washed with water (2 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography on silica gel (eluant: 2% methanol, 98% chloroform) to give a colourless oil identified as 1-[2x-N-(ferf-butyloxycarbonyI N,N-(2",2"~ ((dicinnamyl)aminoethyl)-glycinyl] thiomorpholine. Further elution with 9% methanol, 90% chloroform and 1% acetic acid gave a colourless oil identified as 1-[2 -N-(terf- butyloxycarbonyl N,-(2"-((cinnamyl)aminoethyl)-glycinyl] thiomorpholine (180mg, 0.43mmol, 52%) B. 1-[N,N-(2",2"-((Dicinnamyl)aminoethyl)glycinyl)]thiomorpholine dihydrochloride
1-[2 -N-(ferf-Butyloxycarbonyl N,N-(2",2"-((dicinnamyl)aminoethyl)-gIycinyl] thiomorpholine was dissolved in 4M HCI/dioxan (20mL). After 1 h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[N,N-(2",2"-((dicinnamyl)aminoethyl)glycinyl)]thiomorpholine dihydrochloride.
EXAMPLE 1286 l-[N-(2"-((Cinnamyl)aminoethyl)gIycinyl)]thiomorpholine dihydrochloride
Figure imgf000083_0001
A. 1 -[N-(2"-((Cinnamyl)aminoethyl)glycinyl)]thiomorpholine dihydrochloride
1 -[2,-N-(fe/ -Butyloxycarbonyl N-(2"-((cinnamyl)aminoethyl)-glycinyl] thiomorpholine (180mg, 0.43mmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[N-(2"- ((cinnamyl)aminoethyl)glycinyl)]thiomorphoIine dihydrochloride (168mg, 0.43mmol, 100%).
[M+H]+ = 320.3
EXAMPLE 1287
3,3-Difluoro-1-[W-2"-(3'-trifluoromethyIanilino)pyridyl-3-carbonyl aminoethyl)glycinyl)]pyrrolidine dihydrochloride
Figure imgf000084_0001
A. 3,3-Dif luoro-1 -[N-2 -(terf-butyloxycarbonyl)-N-(2"-(9- fluorenylmethyloxycarbonyl aminoethyl)-glycinyl] pyrrolidine
N-2x-(terf-Butyloxycarbonyl)-N-(2"-(9-fIuorenylmethyloxycarbonyl aminoethyl)-glycine (1.0g, 2.27mmoI) was dissolved in CH2CI2 /DMF (9:1 , 10OmL). To this solution at 0°C were added 1-hydroxybenzotriazole hydrate (620mg, 4.6mmol), water-soluble carbodiimide (δ60mg, 2.8mmol), 3,3-difluoropyrrolidine hydrochloride (360mg, 2.δmmol) and N-methylmorpholine (δOOmg, δmmol). After 1δh at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (100mL). The solution was washed with 0.3M KHS04 (2 x 2δmL), sat. NaHC03 (2 x 2δmL), water (2 x 2δmL) and brine (1 x 2δmL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 60% ethyl acetate, 40% pet. ether) to give a white solid identified as 3,3- difluoro-1-[N-2"-(fert-butyloxycarbonyl)-N-(2"-(9-fluorenylmethyIoxycarbonyl aminoethyl)-glycinyl] pyrrolidine (934g, 1.7mmol, 77%).
B.3,3-Difluoro-1-[N-2 -(ferf-butyIoxycarbonyl)aminoethyI)-glycinyl] pyrrolidine
3,3-Difluoro-1-[N-2'-(ferf-butyloxycarbonyl)-N-(2x,-(9-fluorenylmethyloxycarbonyl aminoethyI)-glycinyl] pyrrolidine (δ90g, 1.6δmmol) was dissolved in tetrahydrofuran (20mL). Diethylamine (δmL) was added. After 90min at room temperature the solvent was removed in vacuo and the residue was purified by flash chromatography on silica gel (eluant: 90% chloroform, 7% methanol, 3% triethylamine) to give a pale yellow oil identified as 3,3-difluoro-1-[N-2'-(feπ'-butyloxycarbonyl)aminoethyl)-glycinyl] pyrrolidine (470mg, 1. δmmol, 91%).
C. 3,3-Dif luoro-1 -[ N-2 -(terf-butyloxycarbonyl)-Λ/-2"-(3'- trifluoromethylanilino)pyridyl-3-carbonyl aminoethyl)glycinyl)]pyrrolidine
3,3-Difluoro-1-[N-2,-(fetf-butyloxycarbonyl)aminoethyl)-glycinyl] pyrrolidine (δOmg,
0.16mmol) was dissolved in CH2CI2 /DMF (9:1 , 20mL). To this solution at 0°C was added 1-hydroxybenzotriazole hydrate (46mg, 0.34mmol), water-soluble carbodiimide (40mg, 0.2mmol), niflumic acid (49mg, 0.17mmol) and N-methylmorpholine (40mg, 0.4mmol). After 1δh at 0°C to room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (70mL). The solution was washed with 0.3M KHS04 (1 x 20mL), sat. NaHC03 (1 x 20mL), water (1 x 20mL) and brine (1 x 20mL), dried (Na2S04) and evaporated in vacuo. The residue was purified by flash chromatography on silica gel (eluant: 7δ% ethyl acetate, 2δ% pet. ether) to give a yellow oil identified as 3,3-difluoro-1-[N-2"-(tert-butyloxycarbonyl)-Λ/-2,,-(3'- trifluoromethylanilino)pyridyl-3-carbonyl aminoethyl)glycinyl)]pyrrolidine (63mg, 0.11 mmol, 67%).
D. 3,3-Dif luoro-1 -[W-2"-(3'-trif luoromethylanilino)pyridyl-3-carbonyl aminoethyl) glycinyl)]pyrrolidine dihydrochloride
3,3-Difluoro-1-[N-2,-(fer -butyloxycarbonyl)-Λ/-2,,-(3'-trifluoromethylanilino)pyridyl-3- carbonyl aminoethyl)glycinyl)]pyrrolidine (δδmg, O.IOmmol) was dissolved in 4M HCI/dioxan (20mL). After 1 h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a pale brown solid identified as 3,3- difluoro-1-[Λ/-2"-(3'-trifluoromethylanilino)pyhdyl-3-carbonyl aminoethyl)glycinyl)]pyrrolidine dihydrochloride (δ2mg, O.IOmmol, 100%).
[M+H]+ = 472.3
EXAMPLE 1288
3,3-Difluoro-[W-2"-(6-Chloro-4-(4'-fluoroanilino)-1,3,5-triazinyl)aminoethyl) glycinyl)]thiomorpholine dihydrochloride
Figure imgf000085_0001
A. 4,6-Dichloro-2-(4'-fluoroanilino)-1 ,3,5-triazine
Cyanuric chloride (1.δ44g, 10mmol) was dissolved in acetonitrile (20mL). The solution was cooled to -20 °C. A solution of 4-fluoroaniline (1.1g, 10mmol) and triethylamine (1.0g, 10mmol) was slowly added. After 1 hour at -20 °C the solvent was removed in vacuo and the residue was taken up in ethyl acetate (1δ0mL). The solution was washed with water (1 x δOmL) and brine (1 x δOmL), dried (Na2S04) and evaporated in vacuo. The residue was recrystallised from ethyl acetate/ hexane to give an off white solid identified as 4,6-dichloro-2-(4'-fluoroanilino)-1,3,δ-triazine 1.7g, δ.Ommol, 60%).
B. 1-[ N-2 -(terf-butyloxycarbonyI)-W-2"- (6-Chloro-4-(4'-fluoroanilino)-1,3,5- triazinyl aminoethyl)glycinyl)] thiomorpholine
1-[N-2 -(terf-butyloxycarbonyl)aminoethyl)-glycinyl] thiomorpholine (100mg, 0.3mmol) was dissolved in dichloromethane (30mL). To this solution was added 4,6-dichloro-2- (4'-fluoroanilino)-1 ,3,δ-triazine (90mg, 0.3mmol) and triethylamine (δOmg, O.δmmol). After 2 hours at room temperature the solvent was removed in vacuo and the residue was taken up in ethyl acetate (1δ0mL). This solution was washed with water (2 x 30mL) and brine (1 x 30mL), dried (Na2S04) and evaporated in vacuo to give a yellow oil. The residue was purified by flash chromatography (eluant: 60% ethyl acetate, 40% pet. ether) to give a white solid identified as 1-[N-2*-(terf-butyloxycarbonyl)-Λ/-2"- (6- chloro-4-(4'-fluoroanilino)-1,3,δ-triazinyl aminoethyl)glycinyl)] thiomorpholine (20mg, 0.032mmol, 11%).
C. l-IW^'^δ-Chloro^^'-fluoroanilinoJ-I.S.δ-triaziny aminoethylJ glycinyl)] thiomorpholine dihydrochloride
1-[N-2'-(ferf-butyIoxycarbonyl)-Λ/-2"- (6-chloro-4-(4'-fluoroanilino)-1 ,3,δ-triazinyl aminoethyl)glycinyl)] thiomorpholine (Iδ.δmg, 0.03mmol) was dissolved in 4M HCI/dioxan (20mL). After 1h at room temperature the solvent was removed in vacuo. The residue was lyophilised from water to give a white solid identified as 1-[Λ/-2"-(6- Chloro-4-(4'-fluoroanilino)-1 ,3,δ-triazinyl)aminoethyl) glycinyl)] thiomorpholine dihydrochloride (1δmg, 0.03mmol, 100%). [M+H]+ = 626.4 TABLE 9
Figure imgf000087_0001
Figure imgf000087_0002
Figure imgf000088_0001
Figure imgf000089_0001
Figure imgf000090_0002
TABLE 10
Figure imgf000090_0001
Figure imgf000090_0003
Figure imgf000091_0001
Figure imgf000092_0001

Claims

1 A compound according to general formula 1, or a pharmaceutically acceptable salt thereof,
Figure imgf000093_0001
1 wherein:
either G1 is -CH2-X2-(CH2)a-G3 and G2 is H, or
G2 is -CH2-(CH2)a-G3 and G1 is H;
G3 is selected from a group according to general formula 2, a group according to general formula 3, and a group according to general formula 4;
Figure imgf000093_0002
a is 0, 1 or 2; b is 1 or 2;
X1 is selected from CH2, S, CF2, CHF, CH(CH3), C(CH3)2, CH(CN) and O;
X2 is selected from CH2, O and S, provided that if a is 1 then X2 is CH2;
X3, X4 and X5 are selected from N and CH, provided that at least two of X3, X4 and X5 are N;
X6 is selected from 0 and NH;
X7 is selected from CH , O, S and NH;
R1 is selected from H and CN; R2 is selected from H and alkyl;
R3 is selected from H, CI, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2;
R4, R5, R6, R7 and R8 are independently selected from H, Br, CI, F, CF3, alkyl, acyl, OH, O-alkyl, NH2, NH-alkyl, N(alkyl)2) N02, NH-acyl, C02H, C02-alkyl,
CONH2, CONH-alkyl, CON(alkyl)2 and CN;
R9 is selected from H and alkyl;
R10, R11, R12, R13 and R14 are independently selected from H, Br, CI, F, CF3, alkyl, acyl, OH, O-alkyl, NH2, NH-alkyl, N(alkyl)2, N02, NH-acyl, C02H, C02- alkyl, CONH2, CONH-alkyl, CON(alkyl)2 and CN;
R15 and R16 are independently selected from H, alkyl, alkenyl, polyfluoroalkyl, aralkyl, aryl and -CH2-L-R17, or R15 and R16 together form a group according to general formula 5, general formula 6 or general formula 7;
Figure imgf000094_0001
5 6 7
R17 is selected from H, alkyl and aryl;
R18 is selected from H, alkyl, aryl, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2;
R19 is selected from H, alkyl, aryl, F, CI, Br, CF3, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2;
L is selected from a covalent bond, CH=CH, C≡C and -C6H -; d and e are selected from 0, 1 , 2 and 3 such that d+e is 3, 4 or δ; and f is selected from 1 , 2 and 3; provided that when R15 and R16 are both H and b is 1 then X1 is not S or CH2.
A compound according to general formula 8, or a pharmaceutically acceptable salt thereof,
Figure imgf000095_0001
wherein:
a is 0, 1 or 2; b is 1 or 2;
X1 is selected from CH2, S, CF2, CHF, CH(CH3), C(CH3)2, CH(CN) and O;
X2 is selected from CH2, O and S, provided that if a is 1 then X2 is CH2;
X3, X4 and X5 are selected from N and CH, provided that at least two of X3, X4 and X5 are N;
X6 is selected from O and NH;
R1 is selected from H and CN;
R2 is selected from H and alkyl;
R3 is selected from H, CI, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2;
R4, R5, R6, R7 and R8 are independently selected from H, Br, CI, F, CF3, alkyl, acyl, OH, O-alkyl, NH2, NH-alkyl, N(alkyl)2, N02, NH-acyl, C02H, C02-alkyl,
CONH2, CONH-alkyl, CON(alkyl)2 and CN.
A compound according to Claim 2 wherein R1 is H.
A compound according to Claim 2 wherein R1 is CN.
A compound according to any of Claims 2 to 4 wherein X1 is CH2.
A compound according to any of Claims 2 to 4 wherein X1 is S.
A compound according to any of Claims 2 to 6 wherein b is 1. A compound according to any of Claims 2 to 6 wherein b is 2.
A compound according to any of Claims 2 to δ wherein a is 1.
A compound according to any of Claims 2 to δ wherein a is 2 and X2 is CH2.
A compound according to any of Claims 2 to 10 wherein X3, X4 and X5 are all
N.
A compound according to general formula 9, or a pharmaceutically acceptable salt thereof,
Figure imgf000096_0001
wherein:
a is 1 or 2; b is 1 or 2;
X1 is selected from CH2, S, CF2, CHF, CH(CH3), C(CH3)2, CH(CN) and O;
X3, X4 and X5 are selected from N and CH, provided that at least two of X3, X4 and X5 are N;
X6 is selected from O and NH;
R1 is selected from H and CN;
R2 is selected from H and alkyl;
R3 is selected from H, CI, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2;
R4, R5, R6, R7 and R8 are independently selected from H, Br, CI, F, CF3, alkyl, acyl, OH, O-alkyl, NH2, NH-alkyl, N(alkyl)2, N02, NH-acyl, C02H, C02-alkyl, CONH2, CONH-alkyl, CON(alkyI)2 and CN.
A compound according to Claim 12 wherein R1 is H.
A compound according to Claim 12 wherein R1 is CN.
A compound according to any of Claims 12 to 14 wherein X1 is CH2.
A compound according to any of Claims 12 to 14 wherein X1 is S.
A compound according to any of Claims 12 to 16 wherein b is 1.
A compound according to any of Claims 12 to 16 wherein b is 2.
A compound according to any of Claims 12 to 1 δ wherein a is 1.
A compound according to any of Claims 12 to 19 wherein X3, X4 and X5 are all
N.
A compound according to general formula 10, or a pharmaceutically acceptable salt thereof,
Figure imgf000097_0001
wherein:
a is 0, 1 or 2; b is 1 or 2;
X1 is selected from CH2, S, CF2, CHF, CH(CH3), C(CH3)2, CH(CN) and O;
X2 is selected from CH2, O and S, provided that if a is 1 then X2 is CH2;
X7 is selected from O, S, CH2 and NH;
R1 is selected from H and CN;
R9 is selected from H and alkyl;
R10, R11, R12, R13 and R14 are independently selected from H, Br, CI, F, CF3, alkyl, acyl, OH, O-alkyl, NH2, NH-alkyl, N(alkyl)2, N02, NH-acyl, C02H, C02- alkyl, CONH2, CONH-alkyl, CON(alkyl)2 and CN is selected from H, CI, OH,
O-alkyl, NH2, NH-alkyl and N(alkyl)2.
A compound according to Claim 21 wherein R1 is H.
A compound according to Claim 21 wherein R1 is CN.
A compound according to any of Claims 21 to 23 wherein X1 is CH2.
A compound according to any of Claims 21 to 23 wherein X1 is S.
A compound according to any of Claims 21 to 26 wherein b is 1.
A compound according to any of Claims 21 to 26 wherein b is 2.
A compound according to any of Claims 21 to 27 wherein a is 1.
A compound according to any of Claims 21 to 27 wherein a is 2 and X2 is
CH2.
A compound according to general formula 11 , or a pharmaceutically acceptable salt thereof,
Figure imgf000099_0001
wherein:
a is 1 or 2; b is 1 or 2;
X1 is selected from CH2, S, CF2, CHF, CH(CH3), C(CH3)2, CH(CN) and O;
X7 is selected from O, S, CH2 and NH;
R1 is selected from H and CN;
R9 is selected from H and alkyl;
R10, R11, R12, R13 and R14 are independently selected from H, Br, CI, F, CF3, alkyl, acyl, OH, O-alkyl, NH2, NH-alkyl, N(alkyl)2, N02, NH-acyl, COzH, C02- alkyl, CONH2, CONH-alkyl, CON(alkyl)2 and CN is selected from H, CI, OH,
O-alkyl, NH2, NH-alkyl and N(alkyl)2.
A compound according to Claim 30 wherein R1 is H.
A compound according to Claim 30 wherein R1 is CN.
A compound according to any of Claims 30 to 32 wherein X1 is CH2.
A compound according to any of Claims 30 to 32 wherein X1 is S.
A compound according to any of Claims 30 to 34 wherein b is 1.
A compound according to any of Claims 30 to 34 wherein b is 2. A compound according to any of Claims 30 to 36 wherein a is 1.
A compound according to general formula 12, or a pharmaceutically acceptable salt thereof,
Figure imgf000100_0001
12 wherein:
a is O, 1 or 2; b is 1 or 2;
X1 is selected from CH2, S, CF2, CHF, CH(CH3), C(CH3)2, CH(CN) and O;
X2 is selected from CH2, O and S, provided that if a is 1 then X2 is CH2;
R1 is selected from H and CN;
R15 and R16 are each independently selected from H, alkyl, alkenyl, polyfluoroalkyl, aralkyl, aryl and CH2-L-R17; or R15 and R16 together are a group according to general formula δ, a group according to general formula 6 or a group according to general formula 7;
Figure imgf000100_0002
6 7
R17 is selected from H, alkyl and aryl;
R18 is selected from H, alkyl, aryl, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2; R19 is selected from H, alkyl, aryl, F, CI, Br, CF3, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2;
L is selected from a covalent bond, CH=CH, C≡C and -C6H -; d and e are selected from 0, 1 , 2 and 3 such that d+e is 3, 4 or δ; and f is selected from 1 , 2 and 3; provided that when R15 and R16 are both H and b is 1 then X1 is not S or CH2.
A compound according to Claim 33 wherein R1 is H.
A compound according to Claim 3δ wherein R1 is CN.
A compound according to any of Claims 33 to 40 wherein X1 is CH2.
A compound according to any of Claims 3δ to 40 wherein X1 is S.
A compound according to any of Claims 33 to 42 wherein b is 1.
A compound according to any of Claims 36 to 42 wherein b is 2.
A compound according to any of Claims 33 to 44 wherein a is 1.
A compound according to any of Claims 33 to 44 wherein a is 2 and X2 is
CH2.
A compound according to general formula 13, or a pharmaceutically acceptable salt thereof,
Figure imgf000101_0001
13 wherein:
a is 1 or 2; b is 1 or 2; X1 is selected from CH2, S, CF2, CHF, CH(CH3), C(CH3)2, CH(CN) and O;
R1 is selected from H and CN;
R15 and R16 are each independently selected from H, alkyl, alkenyl, polyfluoroalkyl, aralkyl, aryl and CH2-L-R17; or R15 and R16 together are a group according to general formula δ, a group according to general formula 6 or a group according to general formula 7;
(
Figure imgf000102_0001
5 6 7
R17 is selected from H, alkyl and aryl;
R18 is selected from H, alkyl, aryl, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2;
R19 is selected from H, alkyl, aryl, F, CI, Br, CF3, OH, O-alkyl, NH2, NH-alkyl and N(alkyl)2;
L is selected from a covalent bond, CH=CH, C≡C and -C6H4-; d and e are selected from 0, 1, 2 and 3 such that d+e is 3, 4 or δ; and f is selected from 1 , 2 and 3.
A compound according to Claim 47 wherein R1 is H.
A compound according to Claim 47 wherein R1 is CN.
A compound according to any of Claims 47 to 49 wherein X1 is CH2.
A compound according to any of Claims 47 to 49 wherein X1 is S.
A compound according to any of Claims 47 to 61 wherein b is 1.
A compound according to any of Claims 47 to 51 wherein b is 2.
A compound according to any of Claims 47 to 53 wherein a is 1.
A pharmaceutical composition comprising a compound according to any of Claims 1 to 64.
A use for a compound according to any of Claims 1 to 64, which is as a component in the preparation of a pharmaceutical composition.
A method of treatment of disease in a human or animal subject, comprising a step of administering to the subject a therapeutically active amount of a compound according to any of Claims 1 to 64
A method of treatment according to claim 67 where the disease is caused by dysregulation of a post-proline cleaving proteases or their endogenous substrates.
A method of treatment according to claim 67 where the disease is ameliorated by inhibition of a post-proline cleaving proteases.
A method of treatment according to claim 67 where the disease is caused by dysregulation of a post-proline cleaving proteases or its endogenous substrates which is an intracellular protease.
A composition according to claim 1 or 33 with the proviso that when X1 = S; b
= 1; R1 = H; G2 = H; G1 is -CH2-X2-(CH2)a-G3; a = 1, X2 = CH2; G3 = NR15R16; and one of R15, R16 = H, the other of R15, R16 is not pyridyl, substituted pyridyl, pyrazinyl or substituted pyrazinyl.
A composition according to claim 1, 36, 47 or 61 with the proviso that when b=1, R1 is H and X1 is S; G1 = H; G2 is -CH2-(CH2)a-G3; a = 1; G3 is NR15R16 and one of R15 and R16 is H the other of R15, R16 is not pyridyl, substituted pyridyl, pyrazinyl or substituted pyrazinyl.
A composition according to claim 1, 33, 47, 61 or 62 with the proviso that when b=1 , R1 is CN and X1 is CH2; G1 = H; G2 is -CH2-(CH2)a-G3; a = 1; G3 is NR15R16 and one of R 5 and R16 is H, the other of R15, R 6 is not pyridyl, substituted pyridyl, pyrazinyl or substituted pyrazinyl. A composition according to claim 1 , 33, 47, 61 , 62 or 63 with the proviso that when G2 = H; G1 = -CH2-X2-(CH2)a-G3; X2 is CH2; a = 1 ; G3 = NR15R16 and R15 = R16 = H; b is not 2 when X1 is O or CH2, and b is not 1 when X1 is CH2.
A method of treatment according to claim 57 in which the disease is caused by dysregulation of a non-membrane associated post-proline cleaving proteases such as QPP, DPP-δ and DPP-9 enzymes or their endogenous substrates.
A method of treatment according to claim 57 in which the disease is ameliorated by inhibition of a non-membrane associated post-proline cleaving proteases such as QPP, DPP-δ and DPP-9 enzymes or their endogenous substrates.
A method according to claim 65 or 66 in which the compound is a selective inhibitor of non-membrane associated post-proline cleaving proteases.
PCT/GB2002/004764 2001-10-23 2002-10-23 Inhibitors of dipeptidyl peptidase iv WO2003035057A1 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
CA002464254A CA2464254A1 (en) 2001-10-23 2002-10-23 Inhibitors of post-proline cleaving proteases
HU0401738A HUP0401738A2 (en) 2001-10-23 2002-10-23 Inhibitors of post-proline cleaving proteases and pharmaceutical compositions containing them
AU2002336190A AU2002336190B2 (en) 2001-10-23 2002-10-23 Inhibitors of Post-Proline Cleaving Proteases
US10/491,794 US7335677B2 (en) 2001-10-23 2002-10-23 Inhibitors of dipeptidyl peptidase IV
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EP02770089A EP1446116A1 (en) 2001-10-23 2002-10-23 Inhibitors of dipeptidyl peptidase iv
NO20042080A NO20042080L (en) 2001-10-23 2004-05-19 Inhibitors of post-proline cleavage proteases
US12/004,054 US20080255126A1 (en) 2001-10-23 2007-12-20 Inhibitors of post-proline cleaving proteases

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US7335677B2 (en) 2008-02-26
GB0125445D0 (en) 2001-12-12
HUP0401738A2 (en) 2004-12-28
US20080255126A1 (en) 2008-10-16
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