3-ethoxyimino-4-methyl-4-methylaminopiperidine dihydrochloride 、 1-(2,4-Difluoro-phenyl)-6,7-difluoro-4-oxo-1,4-dihydro-[1,8]naphthyridine-3-carboxylic acid 在
三乙胺 作用下,
以
乙腈 为溶剂,
以32%的产率得到1-(2,4-difluorophenyl)-6-fluoro-7-(3-ethoxyimino-4-methyl-4-methylaminopiperidin-1-yl)-1,4-dihydro-4-oxo-1,8-naphthyridine-3-carboxylic acid