申请人:Takeda Chemical Industries, Ltd.
公开号:EP1420016A1
公开(公告)日:2004-05-19
A process for producing crystals of 2-ethoxy-1-[[2'-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl]-1H-benzimdazole-7-carboxylic acid (compound (I)), characterized by dissolving or suspending the compound (I) or a salt thereof in a solvent comprising an aprotic polar solvent and crystallizing it. By the process, the contaminants which are contained in the compound (I) or its salt and are difficult to remove, such as tin compounds, analogues of the compound (I), and a residual organic solvent, can be easily removed. Crystals of the compound (I) can be efficiently and easily mass-produced in high yield on an industrial scale.
一种生产 2-乙氧基-1-[[2'-(1H-四唑-5-基)联苯-4-基]甲基]-1H-苯并咪唑-7-羧酸(化合物(I))晶体的工艺,其特征在于将化合物(I)或其盐溶解或悬浮在由钝极性溶剂组成的溶剂中并使其结晶。通过该工艺,化合物(I)或其盐中含有的难以去除的杂质,如锡化合物、化合物(I)的类似物和残留的有机溶剂,可以很容易地去除。化合物(I)的结晶可在工业规模上高效、高产地大量生产。