Process for preparing new imidazolemethylphosphonium salts
申请人:SK&F Lab Co.
公开号:US04163858A1
公开(公告)日:1979-08-07
New imidazolemethylphosphonium salts having a degradable group at the 2-position which are useful intermediates for preparing histamine H.sub.2 antagonists. This invention concerns the preparation of imidazolemethylphosphonium salts having no substituent at the 2-position by heating the compounds referred to above.
New imidazolemethylphosphonium salts having a degradable group at the 2-position which are useful intermediates for preparing histamine H.sub.2 antagonists.
Intermediates and processes useful for preparing medicinal agents
申请人:SK&F Lab Co.
公开号:US04139708A1
公开(公告)日:1979-02-13
New imidazolemethylphosphonium salts having a degradable group at the 2-position which are useful intermediates for preparing histamine H.sub.2 antagonists.
申请人:LEK, tovarna farmacevtskih in
kemicnih izdelkov, n.sol.o.
公开号:EP0279161A2
公开(公告)日:1988-08-24
A new and simple process for the preparation of crystalline cimetidine (N-cyano-Nʹ-methyl-Nʺ-2/(5-methyl-1H-imidazole-4-yl)methylthio/ethyl}guanidine) is described wherein cimetidine is obtained by reacting O-ethyl-S-(4-methylimidazolyl-5-methyl)dithiocarbonate hydrobromide with N-cyano-Nʹ-methyl-Nʺ-(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.
[EN] PYRIDAZINOL COMPOUND, DERIVATIVE THEREOF, PREPARATION METHOD THEREFOR, HERBICIDAL COMPOSITION AND USE THEREOF<br/>[FR] COMPOSÉ DE PYRIDAZINOL, DÉRIVÉ DE CELUI-CI, SON PROCÉDÉ DE PRÉPARATION, COMPOSITION HERBICIDE ET SON UTILISATION<br/>[ZH] 哒嗪醇类化合物及其衍生物、制备方法、除草组合物和应用