1,1-dimethylethyl (2S,4R)-4-({[2,5-bis(methyloxy)phenyl]sulfonyl}amino)-2-methyl-1-pyrrolidinecarboxylate 、 1,1-dimethylethyl (2S,4R)-4-({[5-bromo-2-(methyloxy)phenyl]sulfonyl}amino)-2-methyl-1-pyrrolidinecarboxylate 以to afford the title compound (0.0773 g)的产率得到5-bromo-N-[(3R,5S)-1-cyano-5-methyl-3-pyrrolidinyl]-2-(methyloxy)benzenesulfonamide