2-methyl-2,5-diazabicyclo[2.2.1]heptane dihydrochloride   、                                                                                      
7-fluoro-1-p-fluorophenyl-6,8-difluoro-1,4-dihydro-4-oxo-quinoline-3-carboxylic acid                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  
1,8-二氮杂双环[5.4.0]十一碳-7-烯                                                                                                                                  作用下,
                                                                                                                                                                                        反应 2.0h,
                                                                                                                以55%的产率得到6,8-Difluoro-1-(4-fluoro-phenyl)-7-((1S,4S)-5-methyl-2,5-diaza-bicyclo[2.2.1]hept-2-yl)-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid