反应详情

3-Butene-1,2-diol (5.00 g, 56.7 mmol), acetone (9.88 g, 170 mmol), 2,2-dimethoxy propane (17.7 g, 170 mmol), and p-toluene sulfonic acid (1.62 g, 8.5 mmol) were added to benzene (100 mL). After 16 hours of reflux, starting material was observed by TLC. 2,2-Dimethoxy propane (9.99 g, 95.1 mmol) and acetone (1.58 g, 27.3 mmol) were then added, followed by an additional 3 hour reflux. The mixture was washed with saturated aqueous NaHCO3 and extracted with EtOAc (3×40 mL). The organic extracts were dried over MgSO4, filtered, concentrated and purified by column chromatography (5% ethyl acetate in hexanes) to provide the titled compound (4.12 g, 57%) as a light yellow oil.

1. temperatureAfter 16 hours of reflux
2. temperaturereflux
3. washThe mixture was washed with saturated aqueous NaHCO3
4. extractionextracted with EtOAc (3×40 mL)
5. dry with materialThe organic extracts were dried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. custompurified by column chromatography (5% ethyl acetate in hexanes)