反应详情

温度

0 °C

Methanesulfonic acid (1.2 ml) was added dropwise to a chloroform solution of 4-tert-butyl-5-hydroxy-2-methylbenzofuran (250 mg, 1.2 mmol) and tert-butyl alcohol (500 mg, 6.0 mmol) under cooling with ice. After stirring at 0° C. for 15 min, the mixture was poured into ice water. The mixture was then neutralized with 1N aqueous sodium hydroxide and 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 (n-hexane) to afford 4,6-di-tert-butyl-5-hydroxy-2-methylbenzofuran (35 mg) as a pale yellow oil. Mass 260(M+), 245, 57

1. temperatureunder cooling with ice
2. extractionsubjected to extraction with ethyl acetate
3. washThe extracted layer was washed with a saturated aqueous solution of sodium hydrogen carbonate
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated
6. customThe concentrate was purified by silica gel chromatography (n-hexane)