反应详情

A solution of methyl 3-bromo-4-hydroxy-5-(2-methylprop-2-en-1-yl)benzoate (4.1 g, 14.4 mmol) and boron trifluoride diethyl ether complex (2.0 mL, 15.8 mmol) in toluene (30 mL) was stirred at 100° C. for 90 min. After cooling, the reaction solution was diluted with ethyl acetate, washed successively with water, aqueous sodium hydrogencarbonate solution and aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography (ethyl acetate:hexane=3:97-15:85) to give the title compound (3.05 g, yield 74%) as colorless prism crystals.

1. temperatureAfter cooling
2. washwashed successively with water, aqueous sodium hydrogencarbonate solution and aqueous sodium chloride solution
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated under reduced pressure