To stirred ice-cooled suspension of aluminum chloride (1.360 g, 10.20 mmol) in DCM (10 mL) was slowly added chloroacetyl chloride (864.1 mg, 7.651 mmol). To this solution was added 5bromo-1H-indole (64) (1 g, 5.101 mmol) in DCM (10 mL) and the resulting mixture was stirred at 0 ℃ for 10 min and at r.t. for 4 h. The mixture was poured into stirred ice water and extracted with EtOAc, and the combined organic layers were washed with brine and dried over Na2SO4. The residue was purified with flash column chromatography (SiO2, 0-40% EtOAc in hexane) to obtain the title compound (823 mg, 59% yield).