反应详情

温度

0 °C

Dissolve (2-bromo-5-methoxy-phenyl)methanol (5.0 g, 23 mmol) in dry dichloromethane (120 mL) and cool to 0° C. under nitrogen. Add ethyl vinyl ether (2.5 g, 34 mmol) followed by pyridinium p-toluenesulfonate (580 mg, 2.3 mmol). Warm to room temperature and stir for 2 hours. Pour reaction into saturated aqueous sodium bicarbonate and extract twice with dichloromethane. Combine organic layers and wash with water and brine. Dry with sodium sulfate, filter and concentrate in vacuo to yield 6.6 g (100%) of title compound as a clear colorless oil. 1H NMR (CDCl3) δ 7.41 (d, J=8.6 Hz, 1H), 7.08 (d, J=3.1 Hz, 1H), 6.71 (dd, J=8.8, 3.1 Hz, 1H), 4.88 (q, J=5.3 Hz, 1H), 4.65 (ab, Jab=13.3 Hz, H), 4.55 (ab, Jab=13.3 Hz, 1H), 3.8 (s, 3H), 3.71 (m, 1H), 3.55 (m, 1H), 1.41 (d, J=5.3 Hz, 3H), 1.23 (t, J=7.0 Hz, 3H).

1. temperatureWarm to room temperature
2. additionPour
3. extractionextract twice with dichloromethane
4. washCombine organic layers and wash with water and brine
5. dry with materialDry with sodium sulfate
6. filtrationfilter
7. concentrationconcentrate in vacuo