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                                                                                                                                                              在
                                                                                                                                                                                 
calcium carbonate   、                                                                                                  mercury dichloride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
水   、                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        以51%的产率得到2-[(S)-8-Benzyloxy-7-methoxy-5-oxo-5,11a-dihydro-1H-benzo[e]pyrrolo[1,2-a][1,4]diazepin-(2E)-ylidene]-N-[2-((S)-7-methoxy-5,11-dioxo-2,3,5,10,11,11a-hexahydro-1H-benzo[e]pyrrolo[1,2-a][1,4]diazepin-8-yloxy)-ethyl]-acetamide