The partial synthesis of cyclopycanthogenin, 20R,24S-epoxycycloartan-6alpha, 16beta,25-triol-3-one, was developed in four steps from cyclosiversigenin.
作者:Ting Liu、Jin-Xi Liao、Yang Hu、Yuan-Hong Tu、Jian-Song Sun
DOI:10.1021/acs.joc.7b00080
日期:2017.4.21
The first efficient synthetic approach toward four types of the cycloartane glycosides, the cycloastragenol 25-O; 3-O; 3,6-O-bis; and 3,25-O-bisglycoside, have been established, which featured the PPY-mediated, concentration-controlled acetylation and Au(I)-catalyzed Yu glycosylation. Through the synthetic investigation, the reactivity sequence of the four OHs in cycloastragenol was fixed for the first
第一种有效的合成方法是对四种类型的环戊烷糖苷,环黄芪醇25- O进行合成。3- O ; 3,6- O- bis;已经建立了3,25- O-双糖苷,其特征在于PPY介导的,浓度控制的乙酰化和Au(I)催化的Yu糖基化。通过综合研究,首次确定了环黄芪醇中四个OH的反应序列,并发现了高效去除大的新戊酰基保护基的绕线策略。