(RS)-7,8-difluoro-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid 、 [3-(methylsulphanylmethyl)phenyl]piperazine 在
7-Fluoro-1-methyl-8-[4-[3-(methylsulphanylmethyl)phenyl]piperazin-1-yl]-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid 、
乙醇 、 solid 作用下,
以
二甲基亚砜 为溶剂,
以0.61 g of 7-fluoro-1-methyl-8-[4-[3-(methylsulphanylmethyl)phenyl]piperazin-1-yl]-4-oxo-1,4-dihydrobenzo-[b][1,8]naphthyridine-3-carboxylic acid was obtained in the form of a yellow solid melting at about 240-5° C.的产率得到7-Fluoro-1-methyl-8-[4-[3-(methylsulphanylmethyl)phenyl]piperazin-1-yl]-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid