A novel synthetic approach to (20R)- and (20S)-21-hydroxy steroids. Synthesis of a marine sterol 21-hydroxycholesterol
作者:Hanna Koenig、Iwona Skiera、Krzysztof Błaszczyk、Zdzisław Paryzek
DOI:10.1016/j.steroids.2011.01.010
日期:2011.4
A short and efficient synthesis of steroid synthons, di(tert-butyldimethylsilyl) ethers of 3,21-dihydroxy-24-nor-chol-5-en-23-al (8 and 10) and of ethyl 3,21-dihydroxy-25-homo-chola-5,23-dien-25-oate (9 and 11), having natural (20R) and unnatural (20S) configuration from 3β-(tert-butyldimethylsilyloxy)-14α,20ξ-card-5-enolide (2) is reported. Further elongation of the side chain of these synthons provides
类固醇合成子、3,21-dihydroxy-24-nor-chol-5-en-23-al(8 和 10)和乙基 3,21-dihydroxy-的二(叔丁基二甲基甲硅烷基)醚的简短有效合成25-homo-chola-5,23-dien-25-oate(9 和 11),具有来自 3β-(叔丁基二甲基甲硅烷氧基)-14α,20ξ-card-5-enolide 的天然 (20R) 和非天然 (20S) 构型(2) 报道。这些合成子侧链的进一步延伸为(20R)和(20S)-21-羟基类固醇的合成提供了一种新方法。该方法的效用以天然海洋甾醇 - 21-羟基胆固醇的合成为例 (18)。