反应详情

温度

100 °C

To the solution of 4,6-dimethoxypyrimidine (5 g, 35.7 mmol) in HOAc (20 mL) at room temperature under argon was added Ac2O (4.6 g, 44.6 mmol). The resulting solution was heated at 100° C. for 10 min and then NBS (7.9 g, 44.6 mmol) was added. Heating was continued at 100° C. for 5 h. Analysis by HPLC/MS indicated that the reaction was complete. After the reaction mixture was cooled to room temperature, water (50 mL) was added. The resulting precipitate was collected by filtration and further washed with water (15 mL×3), then dried under vacuum. The title compound (7.5 g) was obtained as a white solid. 1H NMR (CDCl3): δ 4.05 (s, 6H), 8.32 (s, 1H). 13C NMR (CDCl3): δ 55.2, 89.0, 154.9, 166.8.

1. temperatureHeating
2. temperatureAfter the reaction mixture was cooled to room temperature
3. filtrationThe resulting precipitate was collected by filtration
4. washfurther washed with water (15 mL×3)
5. customdried under vacuum