methyl (2S)-N-{4-[(2S)-N-(4-benzyloxy-5-methoxy-2-nitrobenzoyl)-pyrrolidine-2-carboxaldehyde diethyl thioacetal-4-(carboxamidomethylidene)-N-ethyl]oxy-5-methoxy-2-nitrobenzoyl}pyrrolidine-2-carboxylate 在
tin(ll) chloride 作用下,
以
甲醇 为溶剂,
以76%的产率得到7-methoxy-8-{2-[(2S)-N-(4-benzyloxy-5-methoxy-2-aminobenzoyl)pyrrolidine-2-carboxaldehyde diethyl thioacetal-4-(carboxamidomethylidene)-ethyl]oxy}-(11aS)-1,2,3,10,11,11a-hexahydro-5H-pyrrolo[2,1-c][1,4]-benzodiazepin-5,11-dione