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.
一种改进的两步法制备5-(2,5-二甲基苯氧基)-2,2-二甲基戊酸(吉非替布)的方法,该方法通常可得到超过80%的总产率,包括在极性无水溶剂如四氢呋喃中反应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,然后在混合甲苯/二甲基亚砜溶剂体系中反应所形成的中间体与2,5-二甲基苯酚的碱金属盐。