benzyl 1-(3,4-dichlorobenzyl)-5-formyl-4-oxo-4,5,6,7-tetrahydroindole-2-carboxylate   、                                                                                      
4-乙酰氨基苯磺酰叠氮                                                                                                                                                              在
                                                                                                                                                                                 
乙酸乙酯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
三乙胺                                                                                  为溶剂,
                                                                                                                                                    反应 18.0h,
                                                                                                                以20% ethyl acetate as eluent afforded the title compound as a pale yellow solid (0.31 g, 62%), NMR d(CDCl3) 2.80 (2H, t), 3.05 (2H, t), 5.13 (2H, s), 5.57 (2H, s), 6.76 (1H, dd), 7.05 (1H, s), 7.20-7.40 (7H, m)的产率得到benzyl 5-diazo-1-(3,4-dichlorobenzyl)-4-oxo-4,5,6,7-tetrahydroindole-2-carboxylate