2-O-tert-butyl 3-O,5-O-dimethyl (2S,3S,5S)-1-[(2S,4R)-4-(4-methylphenyl)sulfonyloxy-1-phenylmethoxycarbonylpyrrolidine-2-carbonyl]pyrrolidine-2,3,5-tricarboxylate 在
palladium 10% on activated carbon 、
氢气 、
N,N-二异丙基乙胺 作用下,
以
甲醇 为溶剂,
以99%的产率得到6-O-tert-butyl 5-O-methyl (3S,5S,6S,9S,11R)-11-(4-methylphenyl)sulfonyloxy-2,8-dioxo-1,7-diazatricyclo[7.3.0.03,7]dodecane-5,6-dicarboxylate