反应详情

温度

-78 °C

5-Bromopyrimidine (3.18 g, 20 mmol) was dissolved in 50 mL of tetrahydrofuran. While cooled to −78° C., 15 mL of 1.6 M n-butyllithium in hexane solution was added dropwise with stirring. After the solution was stirred for 30 minutes, a solution of N-methoxyl-N-methylacetamide (2.58 g, 25 mmol) in tetrahydrofuran solution (10 mL) was added slowly. The mixture was stirred at −78° C. for 1 hour and then allowed to be warmed slowly. When the temperature of the mixture was at 0° C., aqueous ammonium chloride solution was added. The solution obtained was extracted with ethyl acetate for 3 times. The pooled extracts were washed with brine, dried over magnesium sulfate, concentrated under reduced pressure, and purified by silica gel column chromatography using 5% methanol/methylene chloride as eluent to obtain 1 g of the title compound (45% yield). MS (M+1)=123.05.

1. stirringAfter the solution was stirred for 30 minutes
2. stirringThe mixture was stirred at −78° C. for 1 hour
3. temperatureto be warmed slowly
4. customwas at 0° C.
5. customThe solution obtained
6. extractionwas extracted with ethyl acetate for 3 times
7. washThe pooled extracts were washed with brine
8. dry with materialdried over magnesium sulfate
9. concentrationconcentrated under reduced pressure
10. custompurified by silica gel column chromatography