3-ethoxycarbonyl-1-cyclopropyl-7,8-difluoro-4-oxo-1,4-dihydro-benzo[b][1,8]naphthyridine 、
2-(2-噻吩基)]哌嗪 在
(RS)-1-Cyclopropyl-3-ethoxycarbonyl-7-fluoro-4-oxo-8-[3-(2-thienyl)-1-piperazinyl]-1,4-dihydrobenzo[b][1,8]naphthyridine 作用下,
以(RS)-1-Cyclopropyl-3-ethoxycarbonyl-7-fluoro-4-oxo-8-[3-(2-thienyl)-1-piperazinyl]-1,4-dihydrobenzo[b][1,8]naphthyridine (2.2 g) is obtained in the form of a yellow solid, m.p. 210°-212° C.的产率得到(RS)-1-Cyclopropyl-3-ethoxycarbonyl-7-fluoro-4-oxo-8-[3-(2-thienyl)-1-piperazinyl]-1,4-dihydrobenzo[b][1,8]naphthyridine