7-chloro-1-(2,4-difluorophenyl)-1,4-dihydro-8-methyl-6-nitro-4-oxoquinolone-3-carboxylic acid 、
1-甲基-2-苯基哌啶 在
potassium carbonate 作用下,
以
二甲基亚砜 为溶剂,
以94%的产率得到1-(2,4-difluorophenyl)-1,4-dihydro-8-methyl-7-(4-methyl-3-phenylpiperazin-1-yl)-6-nitro-4-oxoquinoline-3-carboxylic acid