5-difluoromethoxy-1H-[1,2,3]triazole-4-carboxylic acid ethyl ester 、
碘甲烷 以to give 5-difluoromethoxy-1-methyl-1H-[1,2,3]triazole-4-carboxylic acid ethyl ester (isomer A) and 5-difluoromethoxy-2-methyl-2H-[1,2,3]triazole-4-carboxylic acid ethyl ester (isomer B)的产率得到5-difluoromethoxy-1-methyl-1H-[1,2,3]triazole-4-carboxylic acid ethyl ester