A new and simple process for the preparation of crystalline cimetidine (N-cyano-N'-methyl-N"-2/(5-methyl-1H-imidazole-4-yl)methylthio/ethyl}guan idine) is described, wherein cimetidine is obtained by reacting O-ethyl-S-(4-methylimidazolyl-5-methyl)dithiocarbonate hydrobromide with N-cyano-N'-methyl-N"-(2-chloroethyl)guanidine in an aqueous methylamine solution at a temperature between room temperature and the reflux temperature of the reaction mixture, whereupon the desired compound is separated. Cimetidine is a valuable drug in the therapy of the ulcer disease.
本文介绍了一种制备结晶
西米替丁(N-
氰基-
N'-甲基-N"-(2/(5-甲基-
1H-咪唑-4-基)甲
硫基/乙基)
鸟氨酸)的新简单工艺,其中通过在甲基胺溶液中,以室温到反应混合物的回流温度之间的温度,将O-乙基-S-(
4-甲基咪唑基-5-甲基)二
硫代
碳酸酯盐与N-
氰基-
N'-甲基-N"-(2-
氯乙基)
鸟氨酸反应,从而分离所需化合物。
西米替丁是治疗溃疡病的有价值的药物。