Carbon Tetrachloride → 3-(1-bromoethyl)-7-fluoroquinoxalin-2(1H)-one

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3-Ethyl-7-fluoroquinoxalin-2(1H)-one (20.61 g, 107.2 mmol) and 1,3-dibromo-5,5-dimethylhydantoin (18.77 g, 64.34 mmol) suspended in carbon tetrachloride (1072 ml, 107.2 mmol). To the heterogeneous mixture was added benzoyl peroxide (3.463 g, 10.72 mmol) and the mixture was heated at reflux with stirring (oil bath temperature: 80° C.) for 20 h. After 20 h, the mixture was cooled to rt. After cooling, the mixture was poured into saturated aqueous sodium bicarbonate solution (1 L) with stirring. The precipitate was collected by filtration and washed with water (1 L) to give 3-(1-bromoethyl)-7-fluoroquinoxalin-2(1H)-one (23.19 g, 79.8% yield) as a tan solid:

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