A Stereoselective Glycosylation Approach to the Construction of 1,2‐
<i>trans</i>
‐β‐
<scp>d</scp>
‐Glycosidic Linkages and Convergent Synthesis of Saponins
作者:Fuzhu Yang、Wu Hou、Dapeng Zhu、Yu Tang、Biao Yu
DOI:10.1002/chem.202104002
日期:2022.2
Direct action: A highlystereoselective glycosylation protocol for the synthesis of 1,2-trans-β-d- or α-l-glycosidic linkages is disclosed, which employs a combination of glycosyl N-phenyltrifluroacetimidates as donors, FeCl3 as promoter, and CH2Cl2/nitrile as solvent and exploits glycosidation viaglycosyl α-nitrilium intermediates. A variety of natural saponins containing (1→2)-linked glycan motifs