(RS)-2-[4-(2-hydroxyethoxy)phenyl]-piperazine 、
(RS)-7,8-difluoro-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid 以
水 、
二甲基亚砜 为溶剂,
生成 (RS)-7-fluoro-8-{3-[4-(2-hydroxyethoxy)phenyl]-1-piperazinyl}-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid