(2S)-N-{4-[(2S)-N-(4,5-dimethoxy-2-aminobenzoyl)-pyrrolidine-2-carboxaldehyde diethyl thioacetal-4-(carboxamidomethylidene)-N-ethyl]oxy-5-methoxy-2-aminobenzoyl}pyrrolidine-2-carboxaldehyde diethyl thioacetal 在
calcium carbonate 、 mercury dichloride 作用下,
以
水 、
乙腈 为溶剂,
以50%的产率得到2-[(S)-7,8-Dimethoxy-5-oxo-5,11a-dihydro-1H-benzo[e]pyrrolo[1,2-a][1,4]diazepin-(2E)-ylidene]-N-[2-((S)-7-methoxy-5-oxo-2,3,5,11a-tetrahydro-1H-benzo[e]pyrrolo[1,2-a][1,4]diazepin-8-yloxy)-ethyl]-acetamide