Water → 4,6-Di-tert-butyl-2,2-diethyl-5-hydroxy-2,3-dihydrobenzofuran

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Reaction Steps

Lithium aluminum hydride (76 mg) was suspended in tetrahydrofuran (5 ml) under a nitrogen atmosphere. A solution of 5-acetoxy-4,6-di-tert-butyl-2,2-diethyl-2,3-dihydrobenzofuran (0.17 g, 0.5 mmol) in tetrahydrofuran (5 ml) was added dropwise to the suspension. After heating under reflux for 3 h, the reaction mixture was cooled to room temperature and water was added dropwise. After addition of 1N aqueous sodium hydroxide (5 ml), the mixture was subjected to extraction with diethyl ether. The organic layer was dried over anhydrous magnesium sulfate and concentrated. The concentrate was purified by silica gel chromatography (10% ethyl acetate in n-hexane) to afford 4,6-di-tert-butyl-2,2-diethyl-5-hydroxy-2,3-dihydrobenzofuran [130 mg (yield, 87%)] as a pale yellow oil.

Provenance & Evidence