(2S,4R)-4-(2-chlorophenylsulfonyl)-N-(1-cyanocyclopropyl)pyrrolidine-2-carboxamide 、
lithium 1-(tetrahydro-pyran-4-yl)-azetidine-2-carboxylic acid 以yielded (2S,4R)-4-(2-chlorophenylsulfonyl)-N-(1-cyanocyclopropyl)-1-(1-(tetrahydro-2H-pyran-4-yl)azetidine-2-carbonyl)pyrrolidine-2-carboxamide formate 1:1 epimers as a white solid (87%)的产率得到(2S,4R)-4-(2-chlorophenylsulfonyl)-N-(1-cyanocyclopropyl)-1-(1-(tetrahydro-2H-pyran-4-yl)azetidine-2-carbonyl)pyrrolidine-2-carboxamide formate