2,4-二氟苯胺 、 Ethyl 2-(2-chloro-6,7,8-trifluoro-3-quinolinecarbonyl)(dimethylamino)acrylate 在
氯仿 、
乙醇 、
1,8-二氮杂双环[5.4.0]十一碳-7-烯 、
异丙醚 、 solid 作用下,
以
氯仿 为溶剂,
10.0~80.0 ℃
、2.67 MPa
条件下,
反应 9.0h,
以5 g of ethyl 1-(2,4-difluorophenyl)-7,8,9-trifluoro-4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylate were obtained in the form of a yellow solid melting at about 304-306° C., which solid的产率得到ethyl 1-(2,4-difluorophenyl)-7,8,9-trifluoro4-oxo-1,4-dihydrobenzo[b][1,8]naphthyridine-3-carboxylate