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