Efficient synthesis of kaempferol 3,7-O-bisglycosides via successive glycosylation with glycosyl ortho-alkynylbenzoates and trifluoroacetimidates
摘要:
Selective glycosylation of the 3-OH of 5,4'-di-O-acetyl-kaempferol was achieved with glycosyl orthoalkynylbenzoates as donors under the catalysis of Ph(3)PALINTf(2), and subsequent glycosylation of the remaining 7-OH with glycosyl trifluoroacetimidates under the catalysis of BF3.OEt2, after global deprotection, afforded the kaempferol 3,7-O-bisglycosides conveniently. (C) 2012 Elsevier Ltd. All rights reserved.
Highly efficient synthesis of flavonol 5-O-glycosides with glycosyl ortho-alkynylbenzoates as donors
作者:Jin-Xi Liao、Nai-Li Fan、Hui Liu、Yuan-Hong Tu、Jian-Song Sun
DOI:10.1039/c5ob02313k
日期:——
A highly efficient approach to construct the challenging flavonol 5-O-glycosidic linkages is developed, providing a general synthetic route to flavonol 5-O-glycosides.
synthesis of both glycans and nucleosides remains rare and challenging. Herein, we report a one-pot glycosylation strategy for glycans and nucleosides synthesis based on ortho-(1-phenylvinyl)benzylglycosides, which has several advantages, including no aglycon transfers, no undesired interference of departing species, no unpleasant odor, and up to the construction of four different glycosidic linkages
作者:Zhi-Yong Zeng、Jin-Xi Liao、Zhen-Ni Hu、De-Yong Liu、Qing-Ju Zhang、Jian-Song Sun
DOI:10.1021/acs.orglett.0c03185
日期:2020.11.6
protocol to construct the challenging glycosidic linkages at C3-OH of C23-oxo oleanane triterpenoids is disclosed, on the basis of which different strategies for the highly efficient synthesis of QS-21 analogues with the west-wing trisaccharide of QS-21 have been established.
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