反应详情

Mg (0.72 g, 30 mmol) was placed in a 50 mL of round-bottom flask. The flask was dried and filled with nitrogen. Anhydrous THF (10 mL) was injected first and followed by injection of a half amount of a solution of 3-bromo-4-methyl-styrene (3.94 g, 20 mmol) in anhydrous THF (10 mL). After an exothermic reaction started, the second half of the solution was added. The resulting Grignard reagent was added to a solution of chlorodiphenylphosphine (5.25 g, 25 mmol) in anhydrous THF (10 mL) at 0° C. After the addition, the reaction mixture was warmed to the room temperature and stirred for another 20 h. Then, it was poured into a saturated NH4Cl aqueous solution (10 mL) at 0° C. and extracted with anhydrous THF (3×20 mL). The organic layer was dried over anhydrous magnesium sulfate and concentrated to a volume of 5 mL. Hexane was added into the resulting oil to precipitate by-products. After filtration and concentration, the residue was purified by a flash column chromatography (hexane/EAC=4/1) to afford 2.42 g of the desired product (39% yield). 1H NMR (300 MHz, CDCl3) δ 2.36 (3H, s), 5.06 (1H, d, J=10.9 Hz), 5.42 (1H, d, J=17.6 Hz), 6.48 (1H, q, J=10.9, 17.6 Hz), 6.79 (1H, q, J=2.1, 5.8 Hz), 7.20–7-34 (11H, m); 13C NMR (75 MHz, CDCl3) δ 20.8, 21.1, 113.0, 126.2, 128.5, 128.6, 128.8, 130.2, 130.3, 130.7, 133.9, 134.1, 135.1, 136.0, 136.3, 136.5, 141.7 ppm; 31P NMR (121 MHz, CDCl3) δ−12.34 ppm; IR (neat) 3057 (m), 3016 (s), 2974 (m), 1957 (w), 1900 (w), 1819 (w), 1629 (m), 1589 (m), 1479 (s), 1435 (s), 1380 (m), 1306 (w), 1262 (m), 1179 (m), 1152 (m), 1093 (m), 1028 (m), 992 (m), 911 (s), 830 (s), 699 (s); MS m/z 302 (M+) 223, 183, 165, 152, 115, 78; HRMS calcd for C21H19P 302.1224, found 302.1227.

1. customThe flask was dried
2. additionfilled with nitrogen
3. customAfter an exothermic reaction
4. additionthe second half of the solution was added
5. additionAfter the addition
6. extractionextracted with anhydrous THF (3×20 mL)
7. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
8. concentrationconcentrated to a volume of 5 mL
9. additionHexane was added into the resulting oil
10. customto precipitate by-products
11. filtrationAfter filtration and concentration
12. customthe residue was purified by a flash column chromatography (hexane/EAC=4/1)