反应详情

2-(Trifluoromethyl)-5,6,7,8-tetrahydroimidazo[1,2-a]pyrazine (1.06 g, 5.55 mmol, Intermediate 4) and triethylamine (0.850 ml, 6.10 mmol) were dissolved in dichloromethane (DCM) (25 ml). 2-chloro-3-(trifluoromethyl)benzoyl chloride (1.348 g, 5.55 mmol) was added and the mixture stirred at room temperature for 24 h. The solvents were removed in vacuo and the solid partitioned between dichloromethane (100 ml) and saturated sodium bicarbonate solution (50 ml). The aqueous phase was extracted with dichloromethane (3×50 ml), the combine organic extracts were dried over anhydrous sodium sulfate and then concentrated to afford 7-{[2-chloro-3-(trifluoromethyl)phenyl]carbonyl}-2-(trifluoromethyl)-5,6,7,8-tetrahydroimidazo[1,2-a]pyrazine (2.22 g, 5.58 mmol, 101% yield).

1. customThe solvents were removed in vacuo
2. customthe solid partitioned between dichloromethane (100 ml) and saturated sodium bicarbonate solution (50 ml)
3. extractionThe aqueous phase was extracted with dichloromethane (3×50 ml)
4. dry with materialthe combine organic extracts were dried over anhydrous sodium sulfate
5. concentrationconcentrated