Water → 20-Methyl-1alpha,3beta-bis(methoxycarbonyloxy)-21-phenylthiopregna-5, 7-diene

Participants

Reaction Steps

In 2 ml of dimethyl sulfoxide under ice-cooling, 55 mg of thiophenol and 20 mg of sodium hydroxide were stirred. Then, 54 mg of 21-bromo-20-methyl-1α,3β-bis(methoxycarbonyloxy)pregna-5,7-diene was added and the mixture was further stirred at ambient temperature for 3 hours. The reaction mixture was then poured into water and extracted with diethyl ether. The extract was washed with water and aqueous sodium chloride solution, dried over anhydrous sodium sulfate and concentrated. The residue was purified by silica gel column chromatography to give 39 mg of 20-methyl-1α,3β-bis(methoxycarbonyloxy)-21-phenylthiopregna-5, 7-diene.

Provenance & Evidence