Dimethoxymethane → 17beta-Acetoxy-3beta-methoxymethyl-1alpha-methyl-17alpha-n-propyl-5alpha-androstane

Beteiligte Stoffe

Reaktionsschritte

400 mg of 17β-acetoxy-1α-methyl-17α-n-propyl-5α-androstan-3β-ol is combined in 2.8 ml of absolute dichloromethane and 1.8 ml of formaldehyde dimethylacetal with a mixture of 600 mg of kieselguhr W 20 and 300 mg of phosphorus pentoxide and stirred for 45 minutes at room temperature. The mixture is vacuum-filtered from the insoluble components and washed with dichloromethane containing 3-5% triethylamine. The crude product obtained after evaporation is chromatographed on silica gel, thus producing 280 mg of 17β-acetoxy-3β-methoxymethyl-1α-methyl-17α-n-propyl-5α-androstane.

Herkunft & Nachweise