ethyl (S)-7-(2,6-dimethyl-4-pyridinyl)-6,8-difluoro-1-[1-(methylsulfonyloxy)-2-propyl]-1,4-dihydro-4-oxo-3-quinolinecarboxylate 以
四氢呋喃 为溶剂,
生成 ethyl (S)-10-(2,6-dimethyl-4-pyridinyl)-9-fluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de][1,4]benzothiazine-6-carboxylate