反应详情

The mixture of 5-nitropyrimidin-4-ol (1.04 g) and phosphorus oxychloride (5.66 g) in acetonitrile (10 mL) was stirred at reflux for 2 h. After this time, the reaction mixture was cooled to ambient temperature, diluted with ethyl acetate (50 mL), and filtered and the filtrate was concentrated under reduced pressure. The residue obtained was diluted with ethyl acetate (100 mL), washed with saturated aqueous sodium bicarbonate (50 mL) then brine (50 mL), and filtered and the filtrate was concentrated under reduced pressure. The residue obtained was purified by chromatography (silica, heptane to 1:3 ethyl acetate/heptane) to afford 4-chloro-5-nitropyrimidine (383 mg, 33%) as a colorless oil.

1. temperatureat reflux for 2 h
2. filtrationfiltered
3. concentrationthe filtrate was concentrated under reduced pressure
4. customThe residue obtained
5. washwashed with saturated aqueous sodium bicarbonate (50 mL)
6. filtrationbrine (50 mL), and filtered
7. concentrationthe filtrate was concentrated under reduced pressure
8. customThe residue obtained
9. customwas purified by chromatography (silica, heptane to 1:3 ethyl acetate/heptane)