Methyl morpholine oxide → 1alpha,3beta-Bis(tert-butyldimethylsilyloxy)-20-oxopregna-5,7,16-triene

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Reaction Steps

A solution of 1α,3β-bis(tert-butyldimethylsilyloxy)-20(S)-hydroxypregna-5,7,16-triene (50.0 mg, 0.0894 mmol) and 4-methylmorpholine-N-oxide (15.7 mg, 0.134 mmol) in dichloromethane (1 ml) was stirred with powdered molecular sieve 4A at room temperature for 10 minutes. This was combined with tetra-n-butylammonium perruthenate (1.6 mg, 0.00447 mmol) and stirred at room temperature for 30 minutes. The reaction solution was filtered and then diluted with dichloromethane, and the organic layer was washed with saturated aqueous sodium bicarbonate solution, brine and saturated aqueous copper sulfate solution successively and dried over magnesium sulfate. The solvent was distilled off under reduced pressure and the resulting residue was purified by preparative thin layer chromatography (0.5 mm×1, hexane:ethyl acetate=5:1, developed once) to give the title compound as a colorless solid (37.1 mg, 74%).

Provenance & Evidence