Method for preparing high purity azilsartan

摘要

The present invention relates to 1-[[2 '-(2,5-dihydro-5-oxo-1,2,4-oxadiazol-3-yl) [1,1'-biphenyl]-of formula (I) It relates to a process for preparing 4-yl] methyl] -2-ethoxy-1H-benzimidazole-7-carboxylic acid (Azilsartan). The invention also relates to the preparation of novel solid forms of intermediates and their properties which make it possible to obtain high purity azilsartans exceeding 99.7% (HPLC).