3-ethoxycarbonyl-7,8-difluoro-1-methyl-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine 、
1-(4-氟苯基)哌嗪 、
三乙胺 在
ethyl 7-fluoro-8-[4-(4-fluorophenyl)piperazin-1-yl]-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylate 、
水 、
乙醇 、 solid 作用下,
以
二甲基亚砜 为溶剂,
以0.4 g of ethyl 7-fluoro-8-[4-(4-fluorophenyl)piperazin-1-yl]-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylate was obtained in the form of a yellow solid melting at about 310° C.的产率得到ethyl 7-fluoro-8-[4-(4-fluorophenyl)piperazin-1-yl]-1-methyl-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylate