[EN] PROCESS FOR THE PREPARATION OF HIGH PURITY 1-(3,4-DIMETHOXY-PHENYL)-5-ETHYL-7,8-DIMETHOXY-4-METHYL-5H-2,3-BENZODIAZEPINE<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UNE 1-(3,4- DIMÉTHOXY-PHÉNYL)-5-ÉTHYL-7,8-DIMÉTHOXY-4-MÉTHYL-5H-2,3-BENZODIAZÉPINE DE HAUTE PURETÉ
申请人:EGIS GYOGYSZERGYAR NYILVANOSAN
公开号:WO2009156776A1
公开(公告)日:2009-12-30
The present invention relates to the process for the preparation of 1-(3,4-dimethoxy-phenyl)-5-ethyl-7,8-dimethoxy-4-methyl-5H-2,3-benzodiazepine of the Formula (I) by reacting 3,4,3',4'-tetramethoxy-6-(α-aceto-propyl)-benzofenon of the general Formula (II) with hydrazine or hydrazine-hydrate in alcoholic medium, and isolating and purifying the reaction product with a clarifier, which comprises using during the clarifying step a recrystallization solution having an iron content lower than 7 ppm.
本发明涉及通过在醇性介质中将通用式(II)的3,4,3',4'-四甲氧基-6-(α-乙酰基丙基)-苯并酮与肼或肼水合物反应,然后利用澄清剂分离和纯化反应产物,制备通式(I)的1-(3,4-二甲氧基苯基)-5-乙基-7,8-二甲氧基-4-甲基-5H-2,3-苯二氮杂环己烷的过程,其中在澄清步骤中使用的再结晶溶液的铁含量低于7 ppm。