PROBLEM TO BE SOLVED: To provide a method for producing azilsartan alkyl ester to be an intermediate of azilsartan by convenient operation and with high yield and high purity.SOLUTION: High-purity azilsartan alkyl ester is produced by performing a cyclization reaction of alkyl 2-ethoxy-1-[[2'-(alkyloxy-carbonyloxycarbamimidoyl) biphenyl-4-yl]methyl]-1H-benzimidazole-7-carboxylate in a reaction solvent containing a C1-C8 alcohol.SELECTED DRAWING: Figure 1
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