Potassium Carbonate → HCID 70048161, compound

Participants

Reaction Steps

A solution of 10.0 g of 3β-acetoxy-5β-pregn-14-en-20-one (Bach, G. et al. Can. J. Chem. 1968, 46, 733) and K2CO3 (25.0 g) in MeOH/water (160 mL/80 mL) was stirred at room temperature for 2 hrs; the organic solvent was evaporated to dryness under reduced pressure and the aqueous suspension obtained was extracted with CH2Cl2 ; the organic layer was dried over anhydrous sodium sulfate and evaporated to dryness under reduced pressure; the crude 3β-acetoxy-5β,17α-pregn-14-en-20-one obtained was used for the next step without further purification. A solution of the crude intermediate and p-toluensulphonyl hydrazide (11.1 g) in AcOH (300 mL) was stirred at room temp. for 12 hrs. To this solution NaBH4 (7.8 g) was added portionwise; after 2 hrs the reaction mixture was poured in water/ice and the aqueous suspension obtained was extracted with AcOEt and neutralised with 0.1 N NaOH: the organic layer was dried over anhydrous sodium sulfate and evaporated to dryness under reduced pressure. The residue was purified by flash-chromatography (SiO2) using n-hexane/ethyl acetate 1/1 as eluant to give 7.0 g of 3β-acetoxy-5β,17α-pregn-14-ene as a white solid.

Provenance & Evidence