Tert-butyl 2-(4-diazo-5-methoxy-3,5-dioxopentyl)-5-methoxy-3-[2-[(4-methylphenyl)sulfonylamino]ethyl]indole-1-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
copper(I) trifluoromethanesulfonate benzene                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 12.0h,
                                                                                                                以52%的产率得到8-O-tert-butyl 13-O-methyl (1S,9S)-12-hydroxy-4-methoxy-16-(4-methylphenyl)sulfonyl-8,16-diazatetracyclo[7.4.3.01,9.02,7]hexadeca-2(7),3,5,12-tetraene-8,13-dicarboxylate