ethyl 1-cyclopropyl-6-fluoro-7-(4-methoxy-3,5-dimethylphenyl)-8-nitro-4-oxo-1,4-dihydroquinoline-3-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
亚磷酸三乙酯                                                                                                                                  作用下,
                                                                                                                                                                                        反应 2.0h,
                                                                                                                以52%的产率得到ethyl 1-cyclopropyl-6-fluoro-9-methoxy-8,10-dimethyl-4-oxo-4,11-dihydro-1H-pyrido[2,3-a]carbazole-3-carboxylate