Total Synthesis of the Antiviral Glycolipid Cycloviracin B<sub>1</sub>
作者:Alois Fürstner、Jacek Mlynarski、Martin Albert
DOI:10.1021/ja027346p
日期:2002.9.1
The first total synthesis of the antiviral agent cycloviracin B1 (1) is described which provisionally establishes the hitherto unknown configuration of the chiral centers on the lateral fatty acid chains as (3R,19S,25R,3'R,17'S,23'R). Key steps en route to this glycolipid include a highly efficient template-directed macrodilactonization step for the formation of the lactide core followed by a two-directional
Iron(<scp>iii</scp>) chloride modulated selective 1,2-trans glycosylation based on glycosyl trichloroacetimidate donors and its application in orthogonal glycosylation
作者:Mana Mohan Mukherjee、Nabamita Basu、Rina Ghosh
DOI:10.1039/c6ra21859h
日期:——
FeCl3 can also modulate the 1,2-trans selectivity of the reaction of 2-O-alkylated gluco- and galacto-pyranosyl trichloroacetimidates with phenolic compounds leading to the generation of the corresponding β-O-aryl glycosides in excellent yield and selectivity. Apart from these the present methodology has been successfully utilized for double glycosylation and orthogonal glycosylation reactions along
absolute configuration of the attached aglycones. The concise set of data thus obtained also makes clear that the proposed structure of the fattiviracins, a seemingly closely related family of glycoconjugates, is not matched by the published data. Finally, the biological activity of synthetic 1 and some of the keyintermediates obtained en route to this natural product was investigated, showing that