7-((R)-4-(tert-butoxycarbonyl)-3-methylpiperazin-1-yl)-6,8-difluoro-1-(3-fluorophenyl)-1,4-dihydro-4-oxoquinoline-3-carboxylic acid                                                                                                                                                              在
                                                                                                                                                                                 
盐酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                    反应 10.0h,
                                                                                                                以87.2%的产率得到6,8-Difluoro-1-(3-fluoro-phenyl)-7-((R)-3-methyl-piperazin-1-yl)-4-oxo-1,4-dihydro-quinoline-3-carboxylic acid; hydrochloride