(2R,3S)-2-((((9-fluoren-9-yl)methoxy)carbonyl)amino)-3-((tert-butyldi-methylsilyl)oxy)butanoic acid 、
prop-2-enyl (2S,3aR,8bR)-7-[(2S,3aR,8bR)-6-chloro-8b-hydroxy-2-prop-2-enoxycarbonyl-2,3,3a,4-tetrahydro-1H-pyrrolo[2,3-b]indol-7-yl]-6-chloro-8b-hydroxy-2,3,3a,4-tetrahydro-1H-pyrrolo[2,3-b]indole-2-carboxylate 在
N-羟基-7-氮杂苯并三氮唑 、 2-bromo-1-ethylpyridin-1-ium tetrafluoroborate 、
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 、
N,N-二甲基甲酰胺 为溶剂,
以63%的产率得到prop-2-enyl (2S,3aS,8bR)-7-[(2S,3aS,8bR)-3-[(2R,3S)-3-[tert-butyl(dimethyl)silyl]oxy-2-(9H-fluoren-9-ylmethoxycarbonylamino)butanoyl]-6-chloro-8b-hydroxy-2-prop-2-enoxycarbonyl-1,2,3a,4-tetrahydropyrrolo[2,3-b]indol-7-yl]-3-[(2R,3S)-3-[tert-butyl(dimethyl)silyl]oxy-2-(9H-fluoren-9-ylmethoxycarbonylamino)butanoyl]-6-chloro-8b-hydroxy-1,2,3a,4-tetrahydropyrrolo[2,3-b]indole-2-carboxylate