7-chloro-1-(2,4-difluorophenyl)-1,4-dihydro-8-methyl-6-nitro-4-oxoquinolone-3-carboxylic acid   、                                                                                      
1-(4-氯二苯甲基)哌嗪                                                                                                                                                              在
                                                                                                                                                                                 
potassium carbonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二甲基亚砜                                                                                  为溶剂,
                                                                                                                                                                                        以96%的产率得到7-(4-((4-chlorophenyl)(phenyl)methyl)piperazin-1-yl)-1-(2,4-difluorophenyl)-1,4-dihydro-8-methyl-6-nitro-4-oxoquinoline-3-carboxylic acid