反应详情

To a room temperature solution of 4-ethylamino-2-phenylamino-pyrimidine-5-carboxaldehyde (200 mg, 0.83 mmol) in 10 mL of tetrahydrofuran was added (carbethoxyethylidene)triphenylphosphorane (360 mg, 1.0 mmol). The reaction mixture was heated at reflux overnight, cooled, and concentrated in vacuo. The residue was purified by flash chromatography eluting with 1:1 ethyl acetate:hexane. The fractions containing product were concentrated, and 1:2 ethyl acetate:hexane was added to the residue. The resultant solid was collected by filtration to provide 176 mg (65%) of 3-(4-ethylamino-2-phenylamino-pyrimidin-5-yl)-but-2-enoic acid ethyl ester, mp 148-150° C.

1. temperatureThe reaction mixture was heated
2. temperatureat reflux overnight
3. temperaturecooled
4. concentrationconcentrated in vacuo
5. customThe residue was purified by flash chromatography
6. washeluting with 1:1 ethyl acetate
7. additionThe fractions containing product
8. concentrationwere concentrated
9. addition1:2 ethyl acetate:hexane was added to the residue
10. filtrationThe resultant solid was collected by filtration