反应详情

To a stirred suspension of LiAlH4 (0.247 mg) in THF under N2 (10.5 mL), a solution of 3β-hydroxy-5α,6α-epoxyandrostan-17-one (0.64 g) in THF (20 mL) was added dropwise and the mixture was stirred at reflux for 8 h. The suspension was cooled with an ice bath and then quenched by careful addition of H2O (1 mL) and 4N NaOH (0.20 mL). The mixture was filtered through a Celite pad and the filter cake was washed with THF (3×10 mL). The filtrate was dried over Na2SO4, evaporated to dryness and the residue was purified by flash chromatography (SiO2, n-hexane/CH2Cl2/acetone 40/30/30) to give androstane-3β,5α,17β-triol (0.48 g, 74%). 1H-NMR (300 MHz, DMSO-d6, ppm from TMS): δ 4.37 (d, 1H), 4.19 (d, 1H), 3.78 (m, 1H), 3.62 (s, 1H), 3.39 (m, 1H), 1.87-0.80 (m, 21H), 0.86 (s, 3H), 0.59 (s, 3H).

1. temperatureat reflux for 8 h
2. temperatureThe suspension was cooled with an ice bath
3. customquenched by careful addition of H2O (1 mL) and 4N NaOH (0.20 mL)
4. filtrationThe mixture was filtered through a Celite pad
5. washthe filter cake was washed with THF (3×10 mL)
6. dry with materialThe filtrate was dried over Na2SO4
7. customevaporated to dryness
8. customthe residue was purified by flash chromatography (SiO2, n-hexane/CH2Cl2/acetone 40/30/30)