8-chloro-1-ethyl-7-fluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine-3-carboxylic acid 、
1-(4-氟苄基)哌嗪 在
1-Ethyl-7-fluoro-8-[4-(4-fluorobenzyl)piperazin-1-yl]-4-oxo-1,4-dihydrobenzo[b][1,8]-naphthyridine-3-carboxylic Acid 、
N,N-二甲基甲酰胺 、 solid 作用下,
以1.4 g of 1-ethyl-7-fluoro-8-[4-(4-fluorobenzyl)piperazin-1-yl]-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylic acid were obtained in the form of a yellow solid melting at about 286-8° C.的产率得到1-Ethyl-7-fluoro-8-[4-(4-fluorobenzyl)piperazin-1-yl]-4-oxo-1,4-dihydrobenzo[b][1,8]-naphthyridine-3-carboxylic Acid