7,8-difluoro-1-ethyl-4-oxo-1,4-dihydrobenzo[b]-[1,8]naphthyridine-3-carboxylic acid 、 3-Methyl-3-(methylamino)azetidine dimethanesulphonate 在
1-ethyl-7-fluoro-8-(3-methyl-3-methylamino-1-azetidinyl)-4-oxo-1,4-dihydrobenzo[b][1,8]-naphthyridine-3-carboxylic acid 作用下,
以1.18 g of 1-ethyl-7-fluoro-8-(3-methyl-3-methylamino-1-azetidinyl)-4-oxo-1,4-dihydrobenzo[b][1,8]-naphthyridine-3-carboxylic acid are obtained in the form of a yellow solid, which的产率得到1-ethyl-7-fluoro-8-(3-methyl-3-methylamino-1-azetidinyl)-4-oxo-1,4-dihydrobenzo[b][1,8]-naphthyridine-3-carboxylic acid