Water → HCID 54133031, compound

Participants

Reaction Steps

Under an argon atmosphere, to a solution of 1α,3β-bis(t-butyldimethylsilyloxy)-20-oxopregna-5,7-diene (4.10 g, 7.33 mmol) in dry tetrahydrofuran (80 ml), was added tetra-n-butylammonium fluoride (1M solution in tetrahydrofuran, 74 ml, 74.0 mmol), and the mixture was refluxed for 16 hours. Then the mixture was poured into water and extracted with ethyl acetate. The organic layer was washed successively with 10% hydrochloric acid, an aqueous saturated sodium bicarbonate solution and brine, and dried over magnesium sulfate. After the solvent was distilled off under reduced pressure, the residue was purified by column chromatography on silica gel (dichloromethane:ethanol=15:1) to give the title compound (1.68 g, 69%) as a white solid.

Provenance & Evidence