反应详情

温度

90 °C

Ethyl 6-ethyl-4-hydroxypyrimidine-5-carboxylate (7.30 g, 37.21 mmol) was stirred under ice-cooling. Phosphorus oxychloride (11.41 g, 74.41 mmol) was added dropwise to it. After the addition, the mixture was stirred at 90° C. for 3 hours. After cooling to room temperature, the mixture was poured into ice-cooled water and adjusted to pH 10 with an aqueous solution of sodium hydroxide. The resulting mixture was extracted with methylene chloride and dried over magnesium sulfate, and the solvent was evaporated. The residue was purified by column chromatography on silica gel eluting with n-hexane/ethyl acetate (=8/2) to give the desired ethyl 4-chloro-6-ethylpyrimidine-5-carboxylate (3.50 g, 44%).

1. temperaturecooling
2. additionAfter the addition
3. temperatureAfter cooling to room temperature
4. additionthe mixture was poured into ice-
5. extractionThe resulting mixture was extracted with methylene chloride
6. dry with materialdried over magnesium sulfate
7. customthe solvent was evaporated
8. customThe residue was purified by column chromatography on silica gel eluting with n-hexane/ethyl acetate (=8/2)