反应详情

温度

-78 °C

A stirred mixture of 1-benzyloxy-3-bromo-benzene (10.56 g, 40.1 mmol) and dry THF (35 mL) was cooled to −78° C., evacuated and refilled with nitrogen for 10 cycles. To this clear solution was slowly added n-butyllithium (17.7 mL, 44.1 mmol) and stirred for 20 min. Then a mixture of 3,5-dimethoxy-benzaldehyde (7.34 g, 44.1 mmol) in dry THF (30 mL) was added and stirred for 1 hour at −78° C. The mixture was quenched with isopropanol (18.5 mL, 241 mmol) and added water (30 mL). The mixture was extracted with EtOAc (3×80 mL). The combined organic phases were washed with water (2×80 mL), dried over MgSO4 and concentrated to oil, which was purified by flash column chromatography (EtOAc/Hexane) to give (3-benzyloxy-phenyl)-(3,5-dimethoxy-phenyl)-methanol as an oil (11.54 g, 82% yield): 1H NMR (CDCl3) δ 2.21 (d, J=4 Hz, 1H, OH), 3.76 (s, 6H, 2OCH3), 5.04 (s, 2H, CH2), 5.72 (d, J=4 Hz, 1H, CH), 6.36 (t, J=2 Hz, 1H, Ar), 6.54 (d, J=2 Hz, 2H, Ar), 6.85-7.04 (m, 3H, Ar), 7.21-7.43 (m, 6H, Ar). The product was used in the next step without further purification.

1. customevacuated
2. additionrefilled with nitrogen for 10 cycles
3. additionwas added
4. stirringstirred for 1 hour at −78° C
5. extractionThe mixture was extracted with EtOAc (3×80 mL)
6. washThe combined organic phases were washed with water (2×80 mL)
7. dry with materialdried over MgSO4
8. concentrationconcentrated to oil, which
9. customwas purified by flash column chromatography (EtOAc/Hexane)