| 摘要 |
<p>Compounds of the formula (I) : <CHEM> or pharmaceutically acceptable salts thereof, wherein : <??>R<1> and R<2> are independently C1-4alkyl; or R<1> and R<2> 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. </p> |
