BigPatents India

The present invention relates to (pyrido/thieno)-[f]-oxazepine-5-one derivatives having the general Formula I wherein R1, R2 and R3 are independently H or (C1-4)alkyl; Ar represents a fused thiophene or pyridine ring optionally substituted with one or more substituents selected from (C1-4)alkyl, (C1-4)alkyloxy, (C1-4)alkyloxy(C1-4)alkyl, CF3, halogen, nitro, cyano, NR4R5, NR4COR6, and CONR4R5; R4 and R5 are independently H or (C1-4)-alkyl; or R4 and R5 form together with the nitrogen atom to which they are bound a 5-or 6-membered saturated heterocyclic ring, optionally containing a further heteroatom selected from O, S or NR6; R6 is (C1-4)alkyl; A represents the residue of a 4-7 membered saturated heterocyclic ring, optionally containing an oxygen atom, the ring being optionally substituted with 1-3 substituents selected from (C1-4)alkyl, (C1-4)-alkyloxy, hydroxy, halogen and oxo; or a pharmaceutically acceptable salt thereof. The invention also relates to pharmaceutical compositions comprising said derivatives, and to the use of these (pyrido/thieno)-[f]-oxazepine-5-one derivatives in the treatment of neurological diseases and psychiatric disorders which are responsive to enhancement of synaptic responses mediated by AMPA receptors in the central nervous system.