反应详情

Crotonic acid (70 g, 812 mmol) was dissolved in N,N-dimethylformamide (467 ml), which was cooled in an ice bath under nitrogen, and potassium carbonate (61.6 g, 447 mmol) was added. Benzyl bromide (91.7 ml, 772 mmol) was added dropwise to the reaction mixture over 20 minutes. The reaction mixture was stirred at mom temperature for 18 hours. Ethyl acetate was added to the reaction mixture, which was filtered through Celite. The filtered ethyl acetate solution was washed with water, a saturated aqueous sodium bicarbonate solution and a saturated aqueous sodium chloride solution. The organic layer was dried over magnesium sulfate, filtered and concentrated under reduced pressure to give the title compound (142 g, yield: 99.4%).

1. temperaturewhich was cooled in an ice bath under nitrogen
2. filtrationwas filtered through Celite
3. washThe filtered ethyl acetate solution was washed with water
4. dry with materialThe organic layer was dried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure