[CH3:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH:6]=[CH:5]2.[Br:18]N1C(=O)CCC1=O.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1>C(Cl)(Cl)(Cl)Cl>[Br:18][CH2:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH:6]=[CH:5]2A solution of tert-butyl 5-methylindole-1-carboxylate (2.07 g, 9.0 mmol) in CCl4 (50 mL) was treated with N-bromosuccinimide (1.60 g, 9.0 mmol) and benzoyl peroxide (75% in H2O, 276 mg, 9.0 mmol), refluxed for 3 h, concentrated in vacuo and purified by chromatography [SiO2; iso-hexane:EtOAc (20:1)] to give the title compound (1.67 g, 60%) as an orange oil: NMR δH (400 MHz, CDCl3) 8.11 (1H, br d, J 8.5 Hz), 6.72 (1H, d, J 3.5 Hz), 7.59 (1H, d, J 1.5 Hz), 7.35 (1H, dd, J 8.5, 1.5 Hz), 6.54 (1H, d, J 4.0 Hz), 4.64 (2H, s) and 1.67 (9H, s).
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