反应详情

2-Ethoxy-benzo[1,3]dioxol-4-ol (1.11 g, 6.08 mmol), 4-bromomethyl-1,3-dimethoxybenzene (1.17 g, 5.08 mmol), potassium carbonate (0.77 g, 5.59 mmol) and 18-crown-6-ether (0.13 g, 0.51 mmol) were stirred together at room temperature in acetone (40 cm3, 99%) under nitrogen for 18 hours. The solution was evaporated under reduced pressure, and the residue was taken up in dichloromethane (30 cm3) and water (30 cm3). The aqueous layer was extracted with dichloromethane (3×30 cm3), and the combined extracts were washed with water (2×50 cm3), dried (MgSO4), and evaporated under reduced pressure. The residue was chromatographed (SiO2, dichloromethane) to give the di protected pyrogallol, (1.56 g, 92%) as a clear oil.

1. customThe solution was evaporated under reduced pressure
2. extractionThe aqueous layer was extracted with dichloromethane (3×30 cm3)
3. washthe combined extracts were washed with water (2×50 cm3)
4. dry with materialdried (MgSO4)
5. customevaporated under reduced pressure
6. customThe residue was chromatographed (SiO2, dichloromethane)
7. customto give the di