US Patent 7176215 Bicyclic oxopyridine and oxopyrimidine derivatives

Compounds of formulae (1a) and (1b) are described: in which the dashed line represents an optional bond; A is a —N═ atom or a —N(Rb)—, —C(Rb)═ or —C(Rb)(RC)— group; Ra, Rb and Rc is each independently a hydrogen atom or an optionally substituted C1-6alkyl group; X is an —O— or —S— atom or —NH— group or substituted N atom; each Y is independently a N atom or CH group or substituted C atom; n is zero or the integer 1; Alk1 is an optionally substituted aliphatic or heteroaliphatic chain L1 is a covalent bond or a linker atom or group; Cy1 is a hydrogen atom or an optionally substituted cycloaliphatic, polycycloaliphatic, heterocycloaliphatic, polyheterocycloaliphatic, aromatic or heteroaromatic group; Ar is an optionally substituted aromatic or heteroaromatic group; and the salts, solvates, hydrates and N-oxides thereof; The compounds are potent inhibitors of p38 kinase and are use in the prophylaxis or treatment of p38 kinase mediated diseases or disorders, such as rheumatoid arthritis