反应详情

To 3β-acetoxy-24-hydroxy-5α-chol-8(14)-en-15-one (1.0 g) in acetone (50 ml) an 8N solution of Jones reagent was added dropwise with stirring at room temperature until the orange color of the reagent persisted. 2-Propanol (1 ml) was added, and the reaction mixture was filtered through a sintered glass filter and evaporated to dryness under reduced pressure. The residue was dissolved in ethyl acetate, and the organic solution was washed with water, dried over anhydrous sodium sulfate, and evaporated to dryness under reduced pressure to give 3β-acetoxy-15-keto-5α-chol-8(14)-en-24-oic acid (1.0 g) of over 98% purity as judged by 1H NMR. The product showed single component on TLC in three solvent systems (20% methanol in CHCl3, Rf 0.64; isooctaneethyl acetate-acetic acid 5:5:1, Rf 0.56; and CHCl3 -acetonemethanol 7:5:1, Rf 0.18. The structure was confirmed by I.R, N.M.R., and M.S. analyses.

1. filtrationthe reaction mixture was filtered through a sintered glass
2. filtrationfilter
3. customevaporated to dryness under reduced pressure
4. dissolutionThe residue was dissolved in ethyl acetate
5. washthe organic solution was washed with water
6. dry with materialdried over anhydrous sodium sulfate
7. customevaporated to dryness under reduced pressure