反应详情

A solution of tert-butyl diethylphosphonoacetate (6.2 g, 24 mmol) in tetrahydrofuran (20 ml) was added dropwise to a mixture of sodium hydride (60% in oil, 1.1 g, 26 mmol) and tetrahydrofuran (120 ml) at 0° C., and the mixture was stirred at the same temperature for 30 minutes. Successively, a solution of 4-methyl-2-pyridinecarbaldehyde (1.5 g, 12 mmol) in tetrahydrofuran (30 ml) was added dropwise to the mixture at 0° C., and the mixture was stirred at room temperature for 1 hr. The reaction mixture was combined with water and extracted with ethyl acetate. The organic layer was washed with saturated brine and dried over anhydrous magnesium sulfate. The solvent was evaporated. The residue was subjected to a silica gel column chromatography. The fractions eluted with ethyl acetate-hexane (1:5, v/v) were collected and concentrated to give the titled compound (1.9 g, 70%).

1. stirringthe mixture was stirred at room temperature for 1 hr
2. extractionextracted with ethyl acetate
3. washThe organic layer was washed with saturated brine
4. dry with materialdried over anhydrous magnesium sulfate
5. customThe solvent was evaporated
6. washThe fractions eluted with ethyl acetate-hexane (1:5
7. customv/v) were collected
8. concentrationconcentrated