1-tert-butyl-7-chloro-1-1,4-dihydro-8-methyl-6-nitro-4-oxoquinolone-3-carboxylic acid 、
N-(1,4-苯并二烷-2-羰基)哌嗪 在
potassium carbonate 作用下,
以
二甲基亚砜 为溶剂,
以91%的产率得到1-tert-butyl-1,4-dihydro-8-methyl-7-(4-(2,3-dihydrobenzo[b][1,4]dioxin-2-oyl)piperazin-1-yl)-8-methyl-6-nitro-4-oxoquinoline-3-carboxylic acid