反应详情

4-tert-butyl-5-hydroxybenzofuran [J. Org. Chem., 53, 4135 (1988); 40 g, 0.21 mol], benzyl bromide (43 g, 0.25 mol) and potassium carbonate (28.8 g, 0.21 mol) were dissolved in N,N-dimethylformamide (200 ml) and the solution was stirred at room temperature for 24 h. After distilling off the N,N-dimethylformamide under vacuum, water was added to the residue and the mixture was subjected to extraction with ethyl acetate. The extracted layer was washed with a saturated aqueous solution of sodium hydrogen carbonate, dried over anhydrous magnesium sulfate and concentrated. The concentrate was purified by silica gel chromatography (10% ethyl acetate in n-hexane) to afford 5-benzyloxy-4-tert-butylbenzofuran [49.1 g (yield, 83%)].

1. distillationAfter distilling off the N,N-dimethylformamide under vacuum, water
2. additionwas added to the residue
3. extractionthe mixture was subjected to extraction with ethyl acetate
4. washThe extracted layer was washed with a saturated aqueous solution of sodium hydrogen carbonate
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated
7. customThe concentrate was purified by silica gel chromatography (10% ethyl acetate in n-hexane)