4-ethanesulfonylamino-3-methyl-benzofuran-2-carboxylic acid ethyl ester 、
碘甲烷 以to give 4-(ethanesulfonyl-methyl-amino)-3-methyl-benzofuran-2-carboxylic acid ethyl ester的产率得到4-(ethanesulfonyl-methyl-amino)-3-methyl-benzofuran-2-carboxylic acid ethyl ester