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已发现的天然甾醇均为20R 构型。近年来在地质体中发现了具有20S 构型的甾烷类生物标志化合物,并称之为地质构型。合成20S 构型的甾烷的方法之一是由20S 构型的甾醇为原料。20S-胆甾醇及20S-胆甾烷的合成已有报道,但24ξ-甲基-20S-
Natural sterols have been found in the 20R configuration. In recent years, steranes have been found in geologic bodies and have been identified as geostructures. One of the ways to synthesize a 20S-structured sterane is to use a sterol of the 20S configuration as a starting material. The synthesis of 20S-cholesterol and 20S-cholestane has been reported, but 24ξ-methyl-20S-