反应详情

A solution of 7-hydroxycoumarin (0.324 g, 1.99 mmol) and 1-bromo-2-octyne (0.378 g, 1.99 mmol) in 200 ml of acetone was heated under reflux in the presence of anhydrous potassium carbonate (3 grams) for 24 hours. After the reflux period, the reaction mixture was cooled, filtered and the collected solid was washed with fresh acetone. The acetone washings and the filtrate were combined and the solvent evaporated under reduced pressure to yield a pale yellow viscous liquid. The crude product was dissolved in a minimum amount of ethyl acetate and petroleum ether added until the solution became cloudy. The cloudy solution was concentrated under reduced pressure and a white precipitate formed. This precipitate was collected by vacuum filtration and recrystallized from aqueous methanol to yield the title compound as shiny, colorless plates, m.p. 74°-75° C., 0.245 g, 50%. 1H-NMR: 0.8-2.2 (m, 11H, (CH2)4CH3), 4.7 (t, 2H, OCH2C C), 6.2 (d, 1H, C3 --H J=9.3 Hz), 6.8 (dd, 1H, C6 --H), 6.9 (d, 1H, C8 --H, J=2.1 Hz), 7.4 (dd, 1H, C5 --H, J=8.1 Hz), 7.6 (d, 1H, C4 --H, J=9.3 Hz).

1. temperatureAfter the reflux period, the reaction mixture was cooled
2. filtrationfiltered
3. washthe collected solid was washed with fresh acetone
4. customthe solvent evaporated under reduced pressure
5. customto yield a pale yellow viscous liquid
6. additionadded until the solution
7. concentrationThe cloudy solution was concentrated under reduced pressure
8. customa white precipitate formed
9. filtrationThis precipitate was collected by vacuum filtration
10. customrecrystallized from aqueous methanol