[F:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4]([CH3:13])([CH3:12])[C:5](=[O:11])[NH:6]2.C(O)(=O)C.[Br:18]Br.S([O-])([O-])(=O)=S.[Na+].[Na+]>ClCCl>[Br:18][C:10]1[C:2]([F:1])=[C:3]2[C:7](=[CH:8][CH:9]=1)[NH:6][C:5](=[O:11])[C:4]2([CH3:13])[CH3:12]4-Fluoro-3,3-dimethyl-1,3-dihydro-2H-indol-2-one (1 g, 22.9 mmol) was dissolved in dichloromethane (DCM) (50 mL) and acetic acid (2 mL) at room temperature. Bromine (0.386 mL, 7.5 mmol) was added and the solution allowed to stir 24 hours. The reaction mixture was poured into sodium thiosulfate solution, extracted with diethyl ether, the combined organic layers were dried over magnesium sulfate and evaporated. Trituration of the crude product with hexane gave 5-bromo-4-fluoro-3,3-dimethyl-1,3-dihydro-2H-indol-2-one (1.25 g, 87%): HRMS [M−H]− 255.9781
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