methanesulfonate 、
(2S,4S)-2-(1-cyanocyclopropylcarbamoyl)-4-methanesulfonyloxypyrrolidine-1-carboxylic acid tert-butyl ester 、
2,4-二氟苯硫酚 以yielded (2S,4R)-2-(1-cyano-cyclopropylcarbamoyl)-4-(2,4-difluoro-phenylsulfanyl)-pyrrolidine-1-carboxylic acid t-butyl ester as a colorless foam的产率得到(2S,4R)-2-(1-cyano-cyclopropylcarbamoyl)-4-(2,4-difluoro-phenylsulfanyl)-pyrrolidine-1-carboxylic acid t-butyl ester