反应详情

温度

15 °C

To a solution of methyl 3,5-dihydroxybenzoate (50 g, 0.30 mol) in DMF (500 mL) at 0° C. was added sodium hydride (10.8 g, 0.27 mol) portionwise, maintaining the reaction temperature below 10° C. The reaction was allowed to warm to 15° C., and was stirred for 20 minutes. The mixture was cooled to 0° C. and a solution of 2-methylbenzyl bromide (36 mL, 0.27 mol) in DMF (50 mL) was added over 30 minutes. The reaction was warmed to ambient temperature and concentrated in vacuo, the residual oil partitioned between ethyl acetate (500 mL) and water (250 mL), the ethyl acetate layer separated, washed sequentially with water and brine, dried (MgSO4) and evaporated to a residue which was chromatographed on silica eluting with a gradient of 0-100% ethyl acetate in isohexane to give the desired compound (21.9 g). 1H NMR δ (CDCl3) 2.39 (s, 3H), 3.90 (s, 3H), 5.02 (s, 2H), 5.61 (s, 1H), 6.69 (t, 1H), 7.15-7.42 (m, 6H).

1. temperaturemaintaining the reaction temperature below 10° C
2. temperatureThe mixture was cooled to 0° C.
3. temperatureThe reaction was warmed to ambient temperature
4. concentrationconcentrated in vacuo
5. customthe residual oil partitioned between ethyl acetate (500 mL) and water (250 mL)
6. customthe ethyl acetate layer separated
7. washwashed sequentially with water and brine
8. dry with materialdried (MgSO4)
9. customevaporated to a residue which
10. customwas chromatographed on silica eluting with a gradient of 0-100% ethyl acetate in isohexane