Tri-substituted phenyl derivatives and their use in pharmaceutical compositions and methods of treatment

摘要

Compounds of formula (1) <IMAGE> are described wherein Y represents a halogen atom or a group -OR1, where R1 is an optionally substituted alkyl group; R2 represents an optionally substituted cycloalkyl or cycloalkenyl group; R3 is a monocyclic or bicyclic aryl group optionally containing one or more heteroatoms selected from oxygen or sulphur atoms or a group -N(R4)- where R4 is a hydrogen atom or an alkyl group; X is -O-, -S-, or -N(R5)-, where R5 is a hydrogen or an alkyl group; with the proviso that when X is -O- then R3 is not a 3-cyanamino-6-pyridazinyl or a 3-chloro-6-pyridazinyl group; and the salts, solvates, hydrates and N-oxides thereof. The compounds are selective and potent inhibitors of phosphodiesterase IV and are useful for the prophylaxis and treatment of inflammatory diseases and the alleviation of conditions associated with central nervous malfunction.