Hydrogen Peroxide → HCID 54505623, compound

Participants

Reaction Steps

A solution of (20S)-21-hydroxy-20-methylpregn-4-en-3-one (12.8 mmole) in methanol (55 mL) and dichloromethane (11 mL) was cooled to 12° C. and treated in one portion with 30% aqueous hydrogen peroxide (3.3 mL) followed by dropwise addition of an aqueous sodium hydroxide solution prepared by dissolving sodium hydroxide (0.38 g) in water (2.2 mL). After one hour, the cooling bath was removed and the reaction was stirred for an additional 3 hours. Most of the solvent was then removed in vacuo. The residue was dissolved in dichloromethane and purified by flash chromatography (hexane-20% ethyl acetate and hexane-40% ethyl acetate) to give (20S)-4,5-epoxy-21-hydroxy-20-methylpregnan-3-one (73.1%). This material was a mixture of the 4α,5α- and 4β,5β-isomers and it was used as is in further reactions.

Provenance & Evidence