反应详情

温度

0 °C

Dissolve commercially available (2-bromo-5-fluoro-phenyl)-methanol (4.8 g, 23.4 mmol) in methylene chloride (100 mL) and cool to 0° C. Add PPTS (590 mg, 2.3 mmol) followed by ethyl vinyl ether (3.4 mL, 35.1 mmol). Warm reaction to room temperature slowly after addition. After 4 hours, pour the reaction into saturated aqueous sodium bicarbonate and extract with methylene chloride. Dry with sodium sulfate, filter and concentrate in vacuo to yield 5.4 g (83%) of the title compound as a clear and colorless oil. 1H NMR (CDCl3) 37.47 (dd, J=8.6, 5.0 Hz, 1M), 7.27 (dd, J=9.6, 3.1 Hz, 1H), 6.87 (td, J=8.0, 3.1 Hz, 1H), 4.89 (q, J=5.5 Hz, 1H), 4.65 (d, J=13.8 Hz, 1H), 4.54 (d, J=13.8 Hz, 1H), 3.70 (m, 1H), 3.55 (m, 1H), 1.42 (d, J=5.5 Hz, 3H), 1.22 (t, J=7.2 Hz, 3H).

1. temperatureWarm
2. customreaction to room temperature
3. additionslowly after addition
4. additionpour
5. extractionextract with methylene chloride
6. dry with materialDry with sodium sulfate
7. filtrationfilter
8. concentrationconcentrate in vacuo