异丙基磺酰胺 、
ethyl 3-methyl-4-(trifluoromethylsulfonyloxy)benzofuran-2-carboxylate 以to give 3-methyl-4-(propane-2-sulfonylamino)-benzofuran-2-carboxylic acid ethyl ester in 23% yield的产率得到3-methyl-4-(propane-2-sulfonylamino)-benzofuran-2-carboxylic acid ethyl ester