(24R and 24S)-5beta-cholestane-3alpha,7alpha,24,25-tetrols were prepared by osmium tetroxide oxidation of 5beta-cholest-24-ene-3alpha,7alpha-diol. The resulting diastereomeric tetrols were separated by thin-layer chromatography, their purity ascertained by melting point, gas-liquid chromatography and mass spectra and their structural configurations were assigned by molecular rotation measurement and circular dichroism studies. In a similar fashion, the (24R and 24S)-5beta-cholestane-3alpha,24,25-triols were prepared and their structures identified.
(24R和24S)-5β-胆甾烷-3α,7α,24,25-四醇是通过5β-胆甾-24-烯-3α,7α
-二醇用
四氧化锇进行氧化反应制备的。所得的二色异构体四醇通过薄层色谱法分离,其纯度通过熔点、气液色谱和质谱测定,结构配置通过分子旋转测量和圆二色性研究确定。以类似的方式,制备了(24R和24S)-5β-胆甾烷-3α,24,25-三醇,并确定了它们的结构。