反应详情

温度

100 °C

A 75 mL pressure vessel was charged with ethyl 4-chloro-3-oxo-butyrate (4 g, 24.4 mmol), 3,5-dimethylpyrazin-2-amine (3 g, 24.4 mmol) and 200 proof ethanol (24 mL). After stirring at 100° C. in an oil bath for 16 hours, the reaction mixture was concentrated, diluted with dichloromethane and a saturated sodium bicarbonate solution. The organic layer was separated and the aqueous layer was extracted with dichloromethane twice. The combined organic layers were dried over anhydrous sodium sulfate, filtered, concentrated, and purified on silica gel. Elution with a gradient mixture of dichloromethane and methanol yielded ethyl 2-(6,8-dimethylimidazo[1,2-a]pyrazin-2-yl)acetate as a light brown solid (5 g). MS m/z 234 [M+H]+.

1. concentrationthe reaction mixture was concentrated
2. additiondiluted with dichloromethane
3. customThe organic layer was separated
4. extractionthe aqueous layer was extracted with dichloromethane twice
5. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. custompurified on silica gel
9. washElution
10. additionwith a gradient mixture of dichloromethane and methanol