[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[C:9]([N+:11]([O-:13])=[O:12])[CH:10]=1)[NH:7]C(=O)[C:5]2=[O:15].[OH:16]O.Cl>[OH-].[Na+]>[NH2:7][C:8]1[C:9]([N+:11]([O-:13])=[O:12])=[CH:10][C:2]([F:1])=[CH:3][C:4]=1[C:5]([OH:15])=[O:16]To a slurry of 5-fluoro-7-nitro-1H-indole-2,3-dione (3 g, 14.2 mmol) in aqueous 5N NaOH solution (30 mL) was added slowly an aq. solution of 33% hydrogen peroxide (3 mL) at 0° C. After completion of the addition, the reaction mixture was stirred at room temperature for 4 h. After completion of the reaction, the reaction mixture was acidified with 2N HCl and the resulting precipitate was filtered, washed with water (2-3 times) and dried under vacuum to obtain the title compound as yellow solid (2 g, 70.17%).
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