反应详情

4-Acetoxy-3,5-di-tert-butyl-2-(2-ethyl-1-butenyl)phenol (0.85 g, 2.5 mmol) was dissolved in dichloromethane (10 ml) and BF3 etherate (0.4 ml) was added dropwise to the solution under a nitrogen atmosphere. After stirring at room temperature for 3 h, water was added to the reaction mixture and extracted 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-acetoxy-4,6-di-tert-butyl-2,2-diethyl-2,3-dihydrobenzofuran [0.45 g (yield, 53%)] as a pale yellow oil. Mass 346(M+), 304, 57

1. extractionextracted with ethyl acetate
2. washThe extracted layer was washed with a saturated aqueous solution of sodium hydrogen carbonate
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated
5. customThe concentrate was purified by silica gel chromatography (10% ethyl acetate in n-hexane)