7-chloro-1-(2,4-difluorophenyl)-1,4-dihydro-8-methyl-6-nitro-4-oxoquinolone-3-carboxylic acid 、
1-(2-糠酰)哌嗪 在
potassium carbonate 作用下,
以
二甲基亚砜 为溶剂,
以93%的产率得到1-(2,4-difluorophenyl)-1,4-dihydro-7-(4-(2-furoyl)piperazin-1-yl)-8-methyl-6-nitro-4-oxoquinoline-3-carboxylic acid