(RS)-1-cyclopropyl-3-ethoxycarbonyl-7-fluoro-8-[3-(4-methoxyphenyl)-1-piperazinyl]-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine 在
(RS)-1-cyclopropyl-7-fluoro-8-[3-(4-methoxyphenyl)-1-piperazinyl]-4-oxo-1,4-dihydrobenzo [b][1,8]naphthyridine-3-carboxylic acid 、
N,N-二甲基甲酰胺 作用下,
以
氢氧化钾 、
乙醇 为溶剂,
以(RS)-1-cyclopropyl-7-fluoro-8-[3-(4-methoxyphenyl)-1-piperazinyl]-4-oxo-1,4-dihydrobenzo [b][1,8]naphthyridine-3-carboxylic acid (1.5 g) is obtained in the form of a yellow solid的产率得到(RS)-1-cyclopropyl-7-fluoro-8-[3-(4-methoxyphenyl)-1-piperazinyl]-4-oxo-1,4-dihydrobenzo [b][1,8]naphthyridine-3-carboxylic acid