1-(3-cyano-5-(ethoxycarbonyl)-6-ethylpyridin-2-yl)azetidine-3-carboxylic acid 、
1-(4-氯苯基)甲烷磺酰胺 以to give ethyl 6-(3-{[(4-chlorobenzyl)sulfonyl]carbamoyl}azetidin-1-yl)-5-cyano-2-ethylnicotinate的产率得到ethyl 6-(3-{[(4-chlorobenzyl)sulfonyl]carbamoyl}azetidin-1-yl)-5-cyano-2-ethylnicotinate