Ethyl 9-fluoro-10-(4-aminosulfonylphenyl)-3-methyl-7-oxo-2,3-dihydro-(7H)-pyrido(1,2,3-de)-1,4-benzoxazine-6-carboxylate 在
sodium hydroxide 作用下,
以
乙醇 为溶剂,
以68%的产率得到9-fluoro-10-(4-aminosulfonylphenyl)-3-methyl-7-oxo-2,3-dihydro-(7H)-pyrido-(1,2,3-de)-1,4-benzoxazine-6-carboxylic acid