反应详情

At about 0° C., trimethylsilyl chloride (3.7 g, 34.06 mmol, 1.5 equiv.) was added to a solution of (R)-1-(3-chlorophenyl)ethane-1,2-diol (4 g, 23.17 mmol, 1 equiv.) and triethyl orthoacetate (5.6 g, 34.52 mmol, 1.5 equiv.) in dichloromethane (20 mL). After stirring the solution for about 1 hour, the solvent was removed by evaporation. The resulting crude product was resuspended in dry methanol (20 mL) and then potassium carbonate (8 g, 57.88 mmol, 2.5 equiv.) was added. The suspension was stirred vigorously for about 2 hours, and then filtered. The resulting filtrate was washed with dichloromethane and then concentrated in vacuo. The resulting crude was purified by silica gel column chromatography (ethyl acetate:petroleum ether (1:15)) to obtain the title product as a colorless oil (2.2 g; yield=61%). 1H NMR (300 MHz, DMSO-d6) δ: 7.25-7.43 (m, 4H), 3.97 (m, 1H), 3.13 (m, 1H), 2.88 (m, 1H).

1. customthe solvent was removed by evaporation
2. stirringThe suspension was stirred vigorously for about 2 hours
3. filtrationfiltered
4. washThe resulting filtrate was washed with dichloromethane
5. concentrationconcentrated in vacuo
6. customThe resulting crude was purified by silica gel column chromatography (ethyl acetate:petroleum ether (1:15))