| 摘要 |
Tyrosine derivatives of formula (1) are described: in which R is (1) a group R1X1- where R1 is an optionally substituted alkyl or aromatic group, and X1 is a covalent bond or a -(CH2)n- [where n is an integer 1 or 2], -C(O)-, -CH2C(O)-, -NHC(O)-, -CH2NHC(O)-, or -SO2- group, or (2) a group (Hal1)3CSO2-, where Hal1 is a fluorine or chlorine atom; R2 and R3, which may be the same or different, is each a hydrogen or halogen atom or an alkyl, alkoxy, hydroxyl or nitro group; Alk is an alkylene chain; m is zero or an integer 1; R4 is a hydrogen atom or a methyl group; R5 is a group -(CH2)pCO2R8 where p is zero or an integer 1 and R8 is a hydrogen atom or an alkyl group; R6 is a hydrogen atom or an alkyl group; Y is a sulphur atom or a -S(O)q- group where q is an integer 1 or 2; X2 is a -C(O)-, -C(O)O-, -CONH- or -S(O)2- group; R7 is an optionally substituted alkyl group or an aryl or aralkyl group; and the salts, solvates and hydrates thereof. The compounds are able to inhibit the binding of alpha 4 integrins to their ligands and are of use in the prophylaxis and treatment of immune or inflammatory disorders.
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