反应详情

To a room temperature solution of 4-ethylamino-2-phenylamino-pyrimidine-5-carboxaldehyde (320 mg, 1.32 mmol) in 12 mL of tetrahydrofuran was added (carbethoxymethylene)triphenylphosphorane (720 mg, 2.07 mmol). The reaction mixture was heated at reflux for 7 hours then stirred at room temperature overnight. An additional amount of (carbethoxymethylene)triphenylphosphorane (300 mg, 0.86 mmol) was added, and the reaction mixture was heated at reflux for an additional 8 hours then stirred at room temperature for 3 days. The reaction mixture was concentrated in vacuo, and the residue was purified by flash chromatography, eluting with 1:2 ethyl acetate:hexane, to provide 357 mg (86%) of ethyl 3-(4-ethylamino-2-phenylamino-pyrimidin-5-yl)acrylate, mp 125-126° C.

1. temperatureThe reaction mixture was heated
2. temperatureat reflux for 7 hours
3. temperaturethe reaction mixture was heated
4. temperatureat reflux for an additional 8 hours
5. stirringthen stirred at room temperature for 3 days
6. concentrationThe reaction mixture was concentrated in vacuo
7. customthe residue was purified by flash chromatography
8. washeluting with 1:2 ethyl acetate