[Br:1][C:2]1[CH:10]=[C:9]2[C:5]([C:6](=[O:12])C(=O)[NH:8]2)=[CH:4][CH:3]=1.[OH-:13].[Na+].Cl>OO>[NH2:8][C:9]1[CH:10]=[C:2]([Br:1])[CH:3]=[CH:4][C:5]=1[C:6]([OH:12])=[O:13]To a 500 mL round bottom flask, 6-bromo-1H-indole-2,3-dione (50 g, 0.2192 mol) and NaOH (20 g in 250 mL water) were added and cooled the reaction vessel to 0° C. To this reaction mixture 30% hydrogen peroxide (50 mL) was slowly added. The reaction mixture was stirred at 0° C. for 2 h. Subsequently, the reaction mixture was acidified with 2N HCl [pH-6] at 0° C. to afford the solid compound. The solid material was collected by filtration and dried to obtain the title compound [10 g, 21%]. 1H NMR (300 MHz, DMSO-d6): δ 7.59 (d, J=8.7 Hz, 1H), 6.96 (d, J=2.1 Hz, 1H), 6.65 (dd, J′=8.7 Hz, J″=1.8 Hz, 1H) LC-MS (ESI): Calculated mass: 215.0; Observed mass: 215.9 [M+H]+ (RT: 0.83 min).
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