反应详情

A mixture of 4-cyanopyridine-2-carboxaldehyde (0.916 g, 6.93 mmol), methyltriphenylphosphonium bromide (2.48 g, 6.93 mmol), potassium carbonate (1.2 g, 8.66 mmol), 1,4 dioxan (9.5 mL) and water (0.13 mL) was heated under reflux for 5 hours. The mixture was diluted with water (30 mL) and ethyl acetate (70 mL) and the organic layer separated. The aqueous phase was further extracted with ethyl acetate (2×40 mL), the organic fractions combined and dried over magnesium sulphate. After removing the solvent, the residue was purified by silica column chromatography using a Biotage cartridge and eluting with cyclohexane/ethyl acetate (7:3 v/v), then (1:1 v/v). This gave the title compound as an oil.

1. temperaturewas heated
2. temperatureunder reflux for 5 hours
3. customthe organic layer separated
4. extractionThe aqueous phase was further extracted with ethyl acetate (2×40 mL)
5. dry with materialdried over magnesium sulphate
6. customAfter removing the solvent
7. customthe residue was purified by silica column chromatography
8. washeluting with cyclohexane/ethyl acetate (7:3 v/v)