申请人:Parthasaradhi Reddy Bandi
公开号:US20110054186A1
公开(公告)日:2011-03-03
The present invention provides an improved process for preparation of (E)-α-[[2-butyl-1-[[4-(methoxycarbonyl)phenyl]methyl]-1H-imidazole-5-yl]methylene]-2-thiophene propanoic acid ethyl ester in high purity and in high yield. Thus, for example, 4-[[2-butyl-5-formyl-1H-imidazole-1-yl]methyl]benzoic acid methyl ester is reacted with ethyl 2-carboxy-3-(2-thienyl)propionate in the presence of piperidinium propionate in diisopropyl ether or a mixture of n-hexane and a solvent selected from toluene and cyclohexane, optionally purifying the crude compound to obtain (E)-α-[[2-butyl-1-[[4-(methoxy carbonyl)phenyl]methyl]-1H-imidazole-5-yl]methylene]-2-thiophene propanoic acid ethyl ester substantially free of 3-(2-thienyl)propanoic acid ethyl ester impurity.
本发明提供了一种改进的方法,用于制备高纯度和高产率的(E)-α-[[2-丁基-1-[[4-(甲氧羰基)苯基]甲基]-1H-咪唑-5-基]亚甲基]-2-噻吩丙酸乙酯。例如,将4-[[2-丁基-5-甲酰基-1H-咪唑-1-基]甲基]苯甲酸甲酯与丙酸2-羧基-3-(2-噻吩基)酯在哌啶丙酸盐存在下在二异丙醚或正己烷和甲苯或环己烷的混合溶剂中反应,可选地纯化粗化合物,以获得(E)-α-[[2-丁基-1-[[4-(甲氧羰基)苯基]甲基]-1H-咪唑-5-基]亚甲基]-2-噻吩丙酸乙酯,基本上不含3-(2-噻吩基)丙酸乙酯杂质。