反应详情

To a suspension of methyl 2-(4-methyl-6-oxo-2-phenyl-1,6-dihydropyrimidin-5-yl)pentanoate (0.900 g; 3 mmol) in dry toluene (6 mL) under a nitrogen atmosphere were carefully added phosphorus oxychloride (3 mL), dimethylaniline (0.3 mL) and the reaction mixture was heated to reflux for 3 h. The volatiles were removed under reduced pressure, the residue was cooled down in an ice-bath and quenched by adding crushed-ice and a saturated solution of sodium hydrogencarbonate until neutralization. The product was extracted with ethyl acetate, the combined organics were dried over magnesium sulphate, filtered and concentrated under reduced pressure. Purification by flash-chromatography on silica gel using a gradient of ethyl acetate (2-40%) in heptane furnished 0.701 g (73%) of the title compound as a colorless oil.

1. temperaturethe reaction mixture was heated
2. temperatureto reflux for 3 h
3. customThe volatiles were removed under reduced pressure
4. temperaturethe residue was cooled down in an ice-bath
5. customquenched
6. additionby adding
7. customcrushed-ice
8. extractionThe product was extracted with ethyl acetate
9. dry with materialthe combined organics were dried over magnesium sulphate
10. filtrationfiltered
11. concentrationconcentrated under reduced pressure
12. customPurification by flash-chromatography on silica gel using a gradient of ethyl acetate (2-40%) in heptane