4-Bromo-2-methylbutan-2-ol → HCID 69630580, compound

Participants

Reaction Steps

To a solution of 1α,3β-bis(tert-butyldimethylsilyloxy)-17β-(acetylthiomethyl)androsta-5,7-diene (135 mg, 0.223 mmol) and 4-bromo-2-methylbutan-2-ol (186 mg, 1.12 mmol) in tetrahydrofuran (1.5 ml), was added a 1M potassium hydroxide methanol solution (1.5 ml), followed by stirring at room temperature for 1 hour. The reaction mixture was concentrated under reduced pressure, followed by the addition of a saturated aqueous ammonium chloride solution and the extraction with ethyl acetate. The extract was washed with water and saturated brine, dried over anhydrous magnesium sulfate and evaporated under reduced pressure to remove the solvent. The thus obtained residue was purified by preparative thin layer chromatography (4 sheets (each 0.5 mm thickness), dichloromethane:ethyl acetate=9:1, developed once) to give the titled compound (131 mg, 90%) as a colorless oil.

Provenance & Evidence