The straightforward and scalable syntheses of the triterpenoid saponins Anemoclemoside A and B are described. Both compounds feature an unusual cyclic acetal linkage to the carbohydrate l‐arabinose in its open chain form. A mild and facile method was employed to construct the characteristic cyclic acetal glycosidic linkage in both saponins via the PTSA catalyzed condensation of benzyl hederagenate with the respective saccharide side chains.

中文翻译：

---

分离自青光草的两个皂苷Amoclemosides A和B的合成

描述了三萜皂苷Anemoclemoside A和B的简单，可扩展的合成方法。两种化合物均以其开链形式与糖基l-阿拉伯糖具有不同寻常的环状缩醛键。通过PTSA催化二十二碳五烯酸苄酯与相应糖侧链的缩合，采用温和简便的方法在两个皂苷中构建特征性的环状缩醛糖苷键。