Phenylalanine enamide derivatives

1. A compound of formula (1):

wherein

R 1 is a group Ar 1 L 2 Ar 2 Alk-;

Ar 1 is a naphthyridynyl group optionally substituted with one or more -L 3 (Alk 2 ) t L 4 (R 4 ) u atoms or groups;

L 3 and L 4 are each, independently, a covalent bond, —O—, —S—, —C(O)—, —C(O)O—, —OC(O)—, —C(S)—, —S(O)—, —S(O) 2 —, —N(R 8 )—, —CON(R 8 )—, —OC(O)N(R 8 )—, —CSN(R 8 )—, —N(R 8 )CO—, —N(R 8 )C(O)O—, —N(R 8 )CS—, —S(O) 2 N(R 8 )—, —N(R 8 )S(O) 2 —, —N(R 8 )O—, —ON(R 8 )—, —N(R 8 )N(R 8 )—, —N(R 8 )CON(R 8 )—, —N(R 8 )CSN(R 8 )—, or —N(R 8 )SO 2 N(R 8 )—;

R 8 is a hydrogen atom or a straight or branched C 1-6 alkyl group optionally substituted with one, two, or three substituents selected from halogen, hydroxy and C 1-6 alkoxy;

t is zero or the integer 1;

u is an integer 1, 2 or 3;

Alk 2 is an aliphatic or heteroaliphatic chain optionally substituted with one or more substituents selected from halogen, —OH, —CO 2 H, —CO 2 R 9 , —CONHR 9 , —CON(R 9 ) 2 , —COR 9 , C 1-6 alkoxy, thiol, —S(O)R 9 , —S(O) 2 R 9 , C 1-6 alkylthio, amino, —NHR 9 and —N(R 9 ) 2 ;

R 9 is a straight or branched C 1-6 alkyl group optionally substituted with one, two, or three substituents selected from halogen, hydroxy and C 1-6 alkoxy;

R 4 is a hydrogen atom; a halogen atom; C 1-6 alkyl optionally substituted with one, two, or three substituents selected from halogen, hydroxy and C 1-6 alkoxy; C 3-8 cycloatkyl optionally substituted with one, two, or three substituents selected from halogen, hydroxy and C 1-6 alkoxy; —OR 5 ; —SR 5 ; —NR 5 R 6 ; —NO 2 ; —CN; —CO 2 R 5 ; —SO 3 H; —SOR 5 ; —SO 2 R 5 ; —SO 3 R 5 ; —OCO 2 R 5 ; —CONR 5 R 6 ; —OCONR 5 R 6 ; —CSNR 5 R 6 ; —COR 5 ; —OCOR 5 ; —N(R 5 )COR 6 ; —N(R 5 )CSR 6 ; —SO 2 N(R 5 )(R 6 ); —N(R 5 )SO 2 R 6 ; N(R 5 )CON(R 6 )(R 7 ); —N(R 5 )CSN(R 6 )(R 7 ); or —N(R 5 )SO 2 N(R 6 )(R 7 ), provided that when t is zero and each of L 3 and L 4 is a covalent bond, then u is the integer 1 and R 4 is other than a hydrogen atom;

R 5 , R 6 , R 7 , and R 11 are each, independently, a hydrogen atom or a C 1-6 alkyl or C 3-8 cycloalkyl group, wherein each of said alkyl and cycloalkyl groups is optionally substituted with one, two, or three substituents selected from halogen, hydroxy and C 1-6 alkoxy;

L 2 is an —N(R 8 )— group;

Ar 2 is an arylene or heteroarylene group optionally substituted with one or more -L 3 (Alk 2 ) t L 4 (R 4 ) u atoms or groups;

Alk is a chain

R is a carboxylic acid (—CO 2 H), a carboxylic acid ester (—CO 2 Alk 7 ), a carbocylic acid amide (—CONR 5 R 6 ), a tetrazole, phosphonic acid, phosphinic acid, sulphonic acid, sulphinic acid, boronic acid, or an acylsulphonamide group;

Alk 7 is a straight or branched C 1-8 alkyl group, C 2-8 alkenyl group, C 2-8 alkynyl group, C 3-8 cycloalkyl group, C 3-8 heterocycloalkyl group, C 3-8 cycloalkylC 1-8 alkyl group, C 3-8 heterocycloalkylC 1-8 alkyl group, C 1-6 alkyloxyC 1-6 alkyl group, hydroxyC 1-6 alkyl group, C 1-6 alkylthioC 1-6 alkyl group, C 1-6 alkylsulfinylC 1-6 alkyl group, C 1-6 alkylsulfonylC 1-6 alkyl group, C 3-8 cycloalkyloxyC 1-6 alkyl group, C 3-8 cycloalkylthioC 1-6 alkyl group, C 3-8 cycloalkylsulfinylC 1-6 alkyl group, C 3-8 cycloalkylsulfonylC 1-6 alkyl group, C 1-6 alkyloxycarbonylC 1-6 alkyl group, C 1-6 alkyloxycarbonylC 1-6 alkenyl group, C 1-6 alkyloxycarbonyloxyC 1-6 alkyl group, C 1-6 alkyloxycarbonyloxyC 1-6 alkenyl group, C 3-8 cycloalkyloxycarbonyloxyC 1-6 alkyl group, N-di-C 1-8 alkylaminoC 1-8 alkyl group, N—C 6-12 aryl-N—C 1-6 alkylaminoC 1-6 alkyl group, N-di-C 1-8 alkyl-carbamoylC 1-8 alkyl group, C 6-12 arylC 1-6 alkyl group, heteroC 6-10 arylC 1-6 alkyl group, C 6-12 aryl group, a C 6-12 aryloxyC 1-8 alkyl group, a C 6-12 arylthioC 1-8 alkyl group, a C 6-12 arylsulfinylC 1-8 alkyl group, a C 6-12 arylsulfonylC 1-8 alkyl group, C 1-8 alkanoyloxyC 1-8 alkyl group, C 4-8 imidoC 1-8 alkyl group, a C 6-12 aroyloxyC 1-8 alkyl group, or a triglyceride, optionally substituted with one or more R 13a groups;

R 13a is a halogen atom, or an amino (—NH 2 ), NHR 14 , —N(R 14 ) 2 , nitro, cyano, amidino, hydroxyl (—OH), —OR 14 , formyl, carboxyl (—CO 2 H), esterified carboxyl, thiol (—SH), —SR 14 , —SC(═NH)NH 2 , —COR 14 , —CSR 14 , —SO 3 H, —SOR 14 , —SO 2 R 14 , —SO 3 R 14 , —SO 2 NH 2 , —SO 2 NHR 14 , SO 2 N(R 14 ) 2 , —CONH 2 , —CSNH 2 , —CONHR 14 , —CSNHR 14 , —CON(R 14 ) 2 , —CSN(R 14 ) 2 , —N(R 11 )SO 2 R 14 , —N(SO 2 R 14 ) 2 , —NH(R 11 )SO 2 NH 2 , —N(R 11 )SO 2 NHR 14 , —N(R 11 )SO 2 N(R 14 ) 2 , —N(R 1l )COR 14 , —N(R 11 )CONH 2 , —N(R 11 )CONHR 14 , —N(R 11 )CON(R 14 ) 2 , —N(R 11 )CSNH 2 , —N(R 1l)CSNHRl 14 , N(R 11 )CSN(R 14 ) 2 , —N(R 1l )CSR 14 , —N(R 11 )C(O)OR 14 , —SO 2 NHet 1 , —CONHet 1 , —CSNHet 1 , —N(R 11 )SO 2 NHet 1 , —N(R 11 )CONHet 1 , —N(R 11 )CSNHet 1 , —SO 2 N(R 11 )Het 2 , -Het 2 , —CON(R 11 )Het 2 , —CSN(R 11 )Het 2 , —N(R 11 )CON(R 11 )Het 2 , —N(R 11 )CSN(R 11 )Het 2 , aryl or heteroaryl group;

R 14 is an -Alk 6 (R 13a )m, aryl, or heteroaryl group;

Alk 6 is a straight or branched C 1-6 alkylene, C 2-6 alkenylene or C 2-6 alkynylene chain, optionally interrupted by one, two or three —O— or —S— atoms or —S(O)p or —N(R 15 )— groups;

m is zero or the integer 1, 2 or 3;

p is an integer 1 or 2;

R 15 is a hydrogen atom or C 1-6 alkyl group;

Het 1 is a C 5-7 cyclicamino group optionally containing one or more —O— or —S— atoms or —N(R 11 )—, —C(O)—, —C(S)—, S(O) or —S(O)2 groups and optionally substituted with one or more substituents selected from halogen, —OH, —CO 2 H, —CO 2 R 9 , —CONHR 9 , —CON(R 9 ) 2 , —COR 9 , C 1-6 alkoxy, thiol, —S(O)R 9 , —S(O) 2 R 9 , C 1-6 alkylthio, amino, —NHR 9 and —N(R 9 ) 2 ;

Het 2 is a monocyclic C 5-7 carbocyclic group optionally containing one or more —O— or —S— atoms or —N(R 11 )—, —C(O)— or —C(S)— groups and optionally substituted with one or more substituents selected from halogen, —OH, —CO 2 H, —CO 2 R 9 , —CONHR 9 , —CON(R 9 ) 2 , —COR 9 , C 1-6 alkoxy, thiol, —S(O)R 9 , —S(O) 2 R 9 , C 1-6 alkylthio, amino, —NHR 9 and —N(R 9 ) 2 ;

X is an —O— or —S— atom or an —N(R 2 )— group;

R 2 is a hydrogen atom or a C 1-6 alkyl group;

V is an oxygen (O) or sulphur (S) atom;

R z is an atom or group -L 1 (Alk 1 ) n (R 3 ) v ;

L 1 is a covalent bond, an —O—, —S—, or —Se— atom, or a —C(O)—, —C(O)O—, —OC(O)—, —C(S)—, —S(O)—, —S(O) 2 —, —N(R 8 )—, —CON(R 8 )—, —OC(O)N(R 8 )—, —CSN(R 8 )—, —N(R 8 )CO—, —N(R 8 )C(O)O—, —N(R 8 )CS—, —S(O) 2 N(R 8 )—, —N(R 8 )S(O) 2 -, —N(R 8 )O—, —ON(R 8 )—, —N(R 8 )N(R 8 )—, —N(R 8 )CON(R 8 )—, —N(R 8 )CSN(R 8 )—, or —N(R 8 )SO 2 N(R 8 )— group;

Alk 1 is an aliphatic or heteroaliphatic chain optionally substituted with one or more substituents selected from halogen, —OH, —CO 2 H, —CO 2 R 9 , —CONHR 9 , —CON(R 9 ) 2 , —COR 9 , C 1-6 alkoxy, thiol, —S(O)R 9 , —S(O) 2 R 9 , C 1-6 alkylthio amino, —NHR 9 and —N(R 9 ) 2 ;

R 3 is a hydrogen or halogen atom or a group selected from —OR 3a , —SR 3a , —CN and a C 3-10 cycloalkyl; C 3-10 cycloalkenyl; C 3-10 heterocycloalkyl or C 3-10 heterocycloalkenyl containing 1, 2, 3 or 4 heteroatoms or heteroatom-containing groups L 5 , where L 5 is defined as for L 3 ; aromatic or heteroaromatic group optionally substituted with one or more substituents selected from halogen, C 1-6 alkyl, haloC 1-6 alkyl, —C(OH)(CF 3 ) 2 , C 1-6 alkoxy, haloC 1-6 alkoxy, thiol, C 1-6 alkylthio, —(Alk 4 )gR 10 , —CN, —CO 2 R 11 , —NO 2 , —CON(R 11 ) 2 , —CSN(R 11 ) 2 , —COR 11 , —CSN(R 11 ) 2 , —N(R 11 )COR 11 , —N(R 11 )CSR 11 , —SO 2 N(R 11 ) 2 , —N(R 11 )SO 2 R 11 , —N(R 11 )CON(R 11 ) 2 , —N(R 11 )CSN(R 11 ), N(R 11 )SO 2 N(R 11 ) 2 , and phenyl optionally substituted with one, two or three R 13 groups;

R 13 is —R 13a or -Alk 6 (R 13a ) m ;

Alk 4 is a straight or branched C 1-3 alkylene chain;

g is zero or an integer 1;

R 10 is —OH, —SH, or —N(R 11 ) 2 ;

R 3a is a hydrogen atom or a straight or branched C 1-6 alkyl group or C 3-8 cycloalkyl group, wherein each of said alkyl and cycloalkyl groups is optionally substituted with one, two, or three substituents selected from halogen, hydroxy, and C 1-6 alkoxy;

n is zero or the integer 1;

v is the integer 1, 2 or 3;

provided that when n is zero and L 1 is a covalent bond, v is the integer 1;

R X and R Y , together with the carbon atom to which they are attached, are joined together to form a spiro linked cyclopentyl, cyclohexyl, cycloheptyl, or tetrahydropyranyl group optionally substituted with one or more substituents selected from halogen, C 1-6 alkyl, haloC 1-6 alkyl, —C(OH)(CF 3 ) 2 , C 1-6 alkoxy, haloC 1-6 alkoxy, thiol, C 1-6 alkylthio, —(Alk 4 )gR 10 , —CN, —CO 2 R 11 , —NO 2 , —CON(R 11 ) 2 , —CSN(R 11 ) 2 , —COR 11 , —CSN(R 11 ) 2 , —N(R 11 )COR 11 , —N(R 11 )CSR 11 , —SO 2 N(R 11 ) 2 , —N(R 11 )SO 2 R 11 , —N(R 11 )CON(R 11 ) 2 , —N(R 11 )CSN(R 11 ), N(R 11 )SO 2 N(R 11 ) 2 , and phenyl optionally substituted with one, two or three R 13 groups;

provided that the compound is other than ethyl (2S)-2-(2-bromo-3-oxo-spiro [3.5 ]non-1-en-1-ylamino)-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propanoate; or a salt, solvate, hydrate or N-oxide thereof.

2. A compound according to claim 1 in which Alk is a —CH2CH(R)— or —CH(CH 2 R)— chain.

3. A compound according to claim 1 in which R is a carboxylic acid (—CO 2 H) group.

4. A compound according to claim 1 in which R is a carboxylic acid ester of formula —CO 2 Alk 7 .

5. A compound according to claim 1 in which X is an —N(R 2 )— group.

6. A compound according to claim 5 in which R 2 is a hydrogen atom.

7. A compound according to claim 1 in which Ar 2 is an optionally substituted phenylene group or an optionally substituted pyridinediyl group of formula:

where a and b signify the points of attachment of L 2 and Alk respectively.

8. A compound according to claim 1 in which R z is a halogen atom.

9. A compound according to claim 1 in which R z is an optionally substituted C 1-8 alkyl group.

10. A compound according to claim 1 in which R z is a group -L 1 (Alk 1 ) n R 3 in which L 1 is an —O—, —S— or —Se— atom or —S(O)— or —N(R 8 )— group.

11. A compound according to claim 10 in which n is zero.

12. A compound according to claim 10 in which n is the integer 1 and Alk 1 is an optionally substituted C 1-6 alkylene chain.

13. A compound according to claim 10 in which R 3 is a hydrogen atom or an optionally substituted C 3-10 cycloalkyl; C 3-10 cycloalkenyl; C 3-10 heterocycloalkyl or C 3-10 heterocycloalkenyl containing 1, 2, 3 or 4 heteroatoms or heteroatom-containing groups L 5 , where L 5 is defined as for L 3 .

14. A compound according to claim 1 in which R z is a group -L 1 (Alk 1 ) n R 3 in which L 1 is a covalent bond.

15. A compound according to claim 14 in which n is zero.

16. A compound according to claim 14 in which n is the integer 1 and Alk 1 is an optionally substituted C 1-6 alkylene chain.

17. A compound according to claim 14 in which R 3 is a hydrogen atom or an optionally substituted C 3-10 cycloalkyl; C 3-10 cycloalkenyl; C 3-10 heterocycloalkyl or C 3-10 heterocycloalkenyl containing 1, 2, 3 or 4 heteroatoms or heteroatom-containing groups L 5 , where L 5 is defined as for L 3 .

18. A compound according to claim 1 in which R x and R y are joined to form an optionally substituted cyclohexyl group.

19. A compound which is:

(2S)-2-[(2-Isopropylsulfanyl-3-oxo-spiro[3.5]non-1-en-1-yl)amino]-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propanoic acid

(2S)-2-[(2-Isopropylsulfanyl-3-oxo-7-oxa-spiro[3.5]non-1-en-1-yl)amino]-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propanoic acid

(2S)-2-(2-Bromo-3-oxo-spiro [3.5]non-1-en-1-ylamino)-3-[4-(3-methyl-[2,7]naphthyridin-1-ylamino)phenyl]propanoic acid (2S)-2-(2-Bromo-3-oxo-spiro [3.5]non-1-en-1-ylamino)-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propanoic acid

or a salt, solvate, hydrate, N-oxide or carboxylic acid ester thereof.

20. A compound which is:

(2S)-2-[(2-Isopropylsulfanyl-3-oxo-spiro [3.5]non-1-en-1-yl)amino]-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propanoic acid

(2S)-2-[(2-Isopropylsulfanyl-3-oxo-7-oxa-spiro [3.5]non-1-en-1-yl)amino]-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propanoic acid

or a salt, solvate, hydrate, N-oxide or carboxylic acid ester thereof.

21. A pharmaceutical composition comprising a compound according to claim 1 together with one or more pharmaceutically acceptable carriers, excipients or diluents.

22. A method for the treatment of multiple sclerosis, allograft rejection, asthma, or inflammatory bowel disease comprising administering to a mammal suffering from such a disease or disorder a therapeutically effective amount of a compound according to claim 1 .

23. A compound according to claim 1 in which Ar 1 is an optionally substituted 2,7-naphthyridinyl group.

24. A compound according to claim 19 which is (2S)-2-(2-bromo-3-oxo-spiro[3.5]non-1-en-1-ylamino)-3-[4-([2,7]naphthyridin-1-ylamino)phenyl]propionic acid.