反应详情

温度

0 °C

To a solution of diethyl(3,5-dimethoxy-4-i-propylbenzyl)phosphonate (0.50 g, 1.5 mmol) in THF (10 mL) at 0° C. was added NaH (60% in mineral oil) (0.14 g, 3.5 mmol) under N2. After the addition was completed, the suspension was stirred at 0° C. for 1 h and then 2-fluorobenzaldehyde (0.2 mL, 1.9 mmol) in THF (10 mL) was added. The reaction was kept at 0° C. for 1 h and then at 50° C. for 5 h. The reaction was cooled to 0° C. Water (5 mL) was added slowly to quench the reaction followed by addition of 2N HCl (8 mL). The mixture was extracted with ether (3×20 mL). The extract was dried over anhydrous Na2SO4. Evaporation of ether followed by flash chromatography using 5% ethyl acetate in hexane as eluent afforded 2-(3,5-dimethoxy-4-i-propylphenyl)-1-(2-fluorophenyl)ethene (1). (0.31 g, 68%) as a yellow crystal. 1HNMR (CDCl3, ppm): δ 1.34 (d, J=7.1 Hz, 6H), 3.60 (qint. J=7.1 Hz, 1H), 3.89 (s, 6H), 6.74 (s, 2H), 7.0-7.2 (m, 5H), 7.4-7.6 (m, 1H).

1. additionAfter the addition
2. waitThe reaction was kept at 0° C. for 1 h
3. waitat 50° C. for 5 h
4. temperatureThe reaction was cooled to 0° C
5. customto quench the reaction
6. additionfollowed by addition of 2N HCl (8 mL)
7. extractionThe mixture was extracted with ether (3×20 mL)
8. dry with materialThe extract was dried over anhydrous Na2SO4
9. customEvaporation of ether