Synthesis of spirostanol saponins via gold(I)‐catalyzed glycosylation in the presence of Ga(OTf)
<sub>3</sub>
, In(OTf)
<sub>3</sub>
, or HOTf
作者:Teddy Stephen Ehianeta、Dacheng Shen、Peng Xu、Biao Yu
DOI:10.1002/cjoc.201900126
日期:2019.8
gold(I)‐catalyzed glycosylation has been reported in the synthesis of a panel of the representative natural spirostanol saponins, namely polyphyllin D (1), polyphyllin V (2), dioscin (3), formosanin C (4), and a derivative of polyphyllin D bearing a terminal azide group (5). This approach highlights the engagement of low loadings of Ph3AuPOTf (≤ 0.5 mol%) in the presence of Ga(OTf)3, In(OTf)3, or HOTf
An effective approach relying on a Lewis acid‐ or Brønsted acid‐assisted gold(I)‐catalyzed glycosylation has been reported in the synthesis of a panel of the representative natural spirostanol saponins, namely polyphyllin D (1), polyphyllin V (2), dioscin (3), formosanin C (4), and a derivative of polyphyllin D bearing a terminal azide group (5). This approach highlights the engagement of low loadings