MAGNESIUM SILICATE (synthetic) → 1alpha,3beta-Bis(tert-butyldimethylsilyloxy)-20-oxopregna-5,7,16-triene

Participants

Reaction Steps

A suspension of 1α,3β-bis(tert-butyldimethylsilyloxy)-20(S)-hydroxypregna-5,7,16-triene (600 mg, 1.07 mmol), pyridinium dichromate (610 mg, 1.61 mmol) and Florisil (3 g) in dichloromethane (10 ml) was stirred at room temperature for 1.5 hours, then ultrasonicated for 2.5 hours. The solvent was distilled off under reduced pressure and the resulting residue was diluted with diethyl ether and filtered through Celite. The solvent was distilled off under reduced pressure and the resulting residue was purified by column chromatography (hexane:ethyl acetate=15:1) to give the title compound as a colorless solid (343 mg, 57%).

Provenance & Evidence