申请人:Warner-Lambert Company
公开号:US04665226A1
公开(公告)日:1987-05-12
An improved two-step process for preparing 5-(2,5-dimethylphenoxy)-2,2-dimethylpentanoic acid (gemfibrozil) which regularly affords gembibrozil in overall yields in excess of 80% comprises reacting an alkali metal salt of a lower alkyl ester of 2-methylpropanoic acid with 1,3-dibromopropane or 1-bromo-3-chloropropane in a polar aprotic solvent such as tetrahydrofuran, and then reacting the intermediate thus formed with an alkali metal salt of 2,5-dimethylphenol in a mixed toluene/dimethylsulfoxide solvent system.
一种改进的两步骤工艺,用于制备5-(2,5-二甲基苯氧基)-2,2-二甲基戊酸(吉非贝酯),通常可获得超过80%的总产率,包括将2-甲基丙酸较低烷基酯的碱金属盐与1,3-二溴丙烷或1-溴-3-氯丙烷在极性无水溶剂(如四氢呋喃)中反应,然后将所形成的中间体与2,5-二甲基苯酚的碱金属盐在混合甲苯/二甲基亚砜溶剂体系中反应。