Water → 3-Bromo-7-[(2-chloro-4-fluorophenyl)carbonyl]-2-(trifluoromethyl)-5,6,7,8-tetrahydroimidazo[1,2-a]pyrazine

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Reaction Steps

7-{[2-Chloro-3-(trifluoromethyl)phenyl]carbonyl}-2-(trifluoromethyl)-5,6,7,8-tetrahydroimidazo[1,2-a]pyrazine (I22) (181 mg, 0.455 mmol) was dissolved in N,N-dimethylformamide (DMF) (2 mL) and treated with NBS (97 mg, 0.546 mmol). The solution was stirred at RT for 16 h. The mixture was poured on to water (100 ml) containing 1% sodium sulfite (w/w) and extrated in to ethyl acetate (3×50 ml). Combined extracts were washed with brine (50 ml), dried over anhydrous sodium sulfate and concentrated to afford crude product. The crude product was purified by MDAP to afford desired product in 135 mg.

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