1-[3-cyano-6-(difluoromethyl)-5-(ethoxycarbonyl)pyridin-2-yl]piperidine-4-carboxylic acid 、
1-(3,4-difluorophenyl)methanesulfonamide 以to give ethyl 5-cyano-6-(4-{[(3,4-difluorobenzyl)sulfonyl]carbamoyl}piperidin-1-yl)-2-(difluoromethyl)nicotinate的产率得到ethyl 5-cyano-6-(4-([(3,4-difluorobenzyl)sulfonyl]carbamoyl)piperidin-1-yl)-2-(difluoromethyl)nicotinate