反应详情

Ethoxycarbonylmethyltriphenylphosphonium bromide (100 g) in ethanol (500 ml) was added with stirring under nitrogen to a solution of sodium ethoxide (from 4.28 g sodium) in ethanol (100 ml). 3-Acetylpyridine (18.8 g) in ethanol (300 ml) was added dropwise over 0.5 hour. The mixture was allowed to stand for 14 days and was evaporated to dryness. The residue was taken up in water, the pH adjusted to 8.5 and the mixture was extracted with benzene. The extract was dried, evaporated and the residue was distilled at reduced pressure to give ethyl 3-(3-pyridyl)-crotonate (13.39 g) b.p. 78°/0.1 mmHg.

1. customwas evaporated to dryness
2. extractionthe mixture was extracted with benzene
3. customThe extract was dried
4. customevaporated
5. distillationthe residue was distilled at reduced pressure