反应详情

To a stirred suspension of 6α-formylandrostane-3,17-dione (1.77 g) in t-ButOH (35 mL) and 5% aqueous Na2HPO4 solution (21.5 mL), 1N aqueous KMnO4 (35 mL) was added. After 5 minutes at room temperature, the mixture was quenched by addition of 40% aqueous NaHSO3 solution. The suspension was filtered, washed with H2O and the filtrate was freeze-dried. The residue was taken up with H2O (50 mL) and extracted with EtOAc (4×70 mL). The combined organic extracts were dried over Na2SO4 and evaporated to dryness to give 6α-carboxyandrostane-3,17-dione (1.80 g, 96%). 1H-NMR (300 MHz, acetone-d6, ppm from TMS): δ 11.99 (1H, bb), 2.46-0.73 (21H, m), 1.01 (3H, s), 0.79 (3H, s).

1. additionwas added
2. customthe mixture was quenched by addition of 40% aqueous NaHSO3 solution
3. filtrationThe suspension was filtered
4. washwashed with H2O
5. customthe filtrate was freeze-dried
6. extractionextracted with EtOAc (4×70 mL)
7. dry with materialThe combined organic extracts were dried over Na2SO4
8. customevaporated to dryness