ethyl 6-[3-(tert-butoxycarbonyl)azetidin-1-yl]-5-cyano-2-(2,2-difluoroethoxy)nicotinate 以
甲酸 为溶剂,
以to give 1-[3-cyano-6-(2,2-difluoroethoxy)-5-(ethoxycarbonyl)pyridin-2-yl]azetidine-3-carboxylic acid as a solid的产率得到1-[3-cyano-6-(2,2-difluoroethoxy)-5-(ethoxycarbonyl)pyridin-2-yl]azetidine-3-carboxylic acid