3beta-Tert-butyldimethylsilyloxyandrostane-6,17-dione → 3beta-Hydroxy-5alpha-androstan-6,17-dione

Participants

Reaction Steps

To a stirred suspension of 3β-tert-butyldimethylsilyloxyandrostane-6,17-dione (2.00 g) in EtOH (20 mL), 37% HCl (40 μL) was added. After 3 h the solution was quenched with 5% aqueous NaHCO3 to pH 7. The organic solvent was evaporated and the aqueous phase was extracted with CH2Cl2 (4×350 mL). The combined organic extracts were washed with saturated aqueous NH4Cl, brine, H2O, dried over Na2SO4 and evaporated to dryness. The residue was purified by flash chromatography (SiO2, cyclohexane/EtOAc 90/10) to give 3β-hydroxyandrostane-6,17-dione (1.25 g, 86%). 1H-NMR (300 MHz, DMSO-d6, ppm from TMS): δ 4.56 (d, 1H), 3.31 (m, 1H), 2.45-1.15 (m, 20H), 0.77 (s, 3H), 0.65 (s, 3H).

Provenance & Evidence