143591-61-1

General procedure for the synthesis of 3-bromo-8-chloroimidazo[1,2-a]pyrazine from 8-chloroimidazo[1,2-a]pyrazine: N-bromosuccinimide (1.78 g, 10 mmol) was added to a solution of 8-chloroimidazo[1,2-a]pyrazine (1.53 g, 10 mmol) in dichloromethane (30 mL), and the reaction was stirred for 2 hours at room temperature. After the reaction was completed, the reaction mixture was washed with saturated aqueous sodium carbonate solution (2×20 mL), dried with anhydrous magnesium sulfate, filtered, and the filtrate was concentrated under reduced pressure to give 3-bromo-8-chloroimidazo[1,2-a]pyrazine (2.11 g, 96% yield).

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