反应详情

4-Bromophenol (5.76 g, 30 mmol), imidazole (4.08 g, 60 mmol) and tert-butyldimethylsilyl chloride (5.02 g, mmol) were stirred in anhydrous DMF (100 mL) at 25° C. for h. The reaction mixture was then poured into water (100 mL) and extracted with ethyl acetate (2×75 mL). The combined extracts were washed with water (2×75 mL), brine (75 mL) and dried (MgSO4) before concentration in vacuo. The crude product was purified using "flash" silica gel column chromatography with ethyl acetate:hexane (1:4) as eluant to afford the title compound as an oil, 7.9 g, 92%. 1H NMR (CDCl3, 300 MHz): δ 7.33 (app. dt, J=9, 3, 1 Hz, 2 H), 6.73 (app. dt, J=9, 3, 1 Hz, 2 H) 0.98 (s, 9 H),0.21 (s, 6 H).

1. extractionextracted with ethyl acetate (2×75 mL)
2. washThe combined extracts were washed with water (2×75 mL), brine (75 mL)
3. dry with materialdried (MgSO4)
4. concentrationbefore concentration in vacuo
5. customThe crude product was purified