Azilsartan Alkyl ester, azilsartan methyl ester production method, and azilsartan production method

摘要

PROBLEM TO BE SOLVED: To provide azilsartan alkyl ester as an intermediate of azilsartan, a method for producing azilsartan methyl ester having a novel crystalline form, and a method for producing high-purity azilsartan from the obtained compound. SOLUTION: A method for producing a high-purity azilsartan alkyl ester and / or azilsartan methyl ester by crystallizing the azilsartan alkyl ester and / or the azilsartan methyl ester in acetone or a mixed solvent of acetone and alcohol. I will provide a. [Selection diagram] Fig. 1