HETEROCYCLIC HISTAMINE H2-RECEPTOR ANTAGONISTS

摘要

Compounds of the formula (I) : …CHEM… or pharmaceutically acceptable salts thereof, wherein : …??R1 and R2 are independently C1-4alkyl; or R1 and R2 together with the nitrogen atom to which they are joined represent a pyrrolidino, piperidino or hexahydroazepino ring; Y is straight-chain or branched-chain C1-4alkyl; n is 2 to 5; m is 0 or 1; when m is 1, Z is inter alia an optionally substituted pyridine, pyrimidine, oxazole, thiazole, imidazole, benzoxazole benzthiazole or N-alkylbenzimidazole ring; when m is 0, Z is an optionally substituted imidazole, pyrazole or benzimidazole ring. …??The compounds are histamine H2-receptors antagonists and relatively lipophilic and can penetrate the blood-brain barrier and are useful in treating diseases mediated via histamine H2- receptors. Processes for their preparation, pharmaceutical compositions and methods of use are described.