反应详情

Acetylene gas was bubbled into tetrahydrofuran (30 ml) for 30 minutes. Ethyl magnesium bromide (25 ml) was added. 2-(Tetrahydro-2-pyranyloxy)-acetaldehyde (5.0 g, 0.035 mole) in tetrahydrofuran (25 ml) was then added. The reaction mixture was warmed to room temperature and stirred overnight. Saturated ammonium chloride aqueous solution (30 ml) was added to quench the unreacted acetylide and extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate, concentrated and separated by silica gel chromatography eluted with n-hexane/ethyl acetate (5:2) to give colorless oil (4.5 g, 76%).

1. customAcetylene gas was bubbled into tetrahydrofuran (30 ml) for 30 minutes
2. additionEthyl magnesium bromide (25 ml) was added
3. customto quench the unreacted acetylide
4. extractionextracted with ethyl acetate
5. dry with materialThe extract was dried over anhydrous magnesium sulfate
6. concentrationconcentrated
7. customseparated by silica gel chromatography
8. washeluted with n-hexane/ethyl acetate (5:2)