摘要:
A novel cyanoguanidine derivative represented by the following general formula (I): wherein X stands for a hydrogen atom, a chlorine atom or a bromine atom, and R stands for a lower alkyl group, is an effective precursor for the synthesis of N-cyano-Nʹ-methyl-Nʺ-(2-(5-methyl-4-imidazolylmethylthio)ethyl)-guanidine (Cimetidine) which has an action of controlling secretion of gastric acid and is valuable as an agent for the remedy of a gastric ulcer. This cyanoguanidine derivative is prepared by reacting a methylvinylketone derivative with a mercaptoguanidine derivative or by reacting an amidinoketone derivative with a halogenating agent.
摘要:
A process for the purification of N-cyano-N′-methyl-N˝-[2-{(5-methyl-1H-imidazol-4-yl)methylthio}ethyl)guanidine, which comprises bringing a crude product of N-cyano-N′-methyl-N˝-[2-{(5-methyl-1H-imidazol-4-yl)methylthio}ethyl]guanidine into contact with activated carbon in water in the presence of an organic acid.