反应详情

2,4-Dimethyl-6-hydroxypyrimidine (20 g) was added to phosphorus oxychloride (120 ml) and the mixture was refluxed for 2 hours. Excess phosphorus oxychloride was removed in vacuo, water was added and the product was extracted into dichloromethane (2×200 ml), dried (Na2SO4) and the solvent removed to give 2,6-dimethyl-4-chloropyrimidine as an oil (21 g) which slowly crystallised on standing; NMR (CDCl3): 2.52 (s, 3H), 2.71 (s, 3H), 7.05 (s, 1H).

1. temperaturethe mixture was refluxed for 2 hours
2. customExcess phosphorus oxychloride was removed in vacuo, water
3. additionwas added
4. extractionthe product was extracted into dichloromethane (2×200 ml)
5. dry with materialdried (Na2SO4)
6. customthe solvent removed