Electrochemistry of Chalcogenoglycosides. Rational Design of Iterative Glycosylation Based on Reactivity Control of Glycosyl Donors and Acceptors by Oxidation Potentials
作者:Shigeru Yamago、Koji Kokubo、Osamu Hara、Sadayoshi Masuda、Jun-ichi Yoshida
DOI:10.1021/jo0261350
日期:2002.11.1
also affected by the para-substituents, and the substitution effect correlates very well with the HOMO energy of para-substituted benzenechalcogenol and with the Hammett sigma p + value. Electrochemical glycosylation of telluroglycosides has been examined, and it was found that the use of an undivided cell is more effective than the use of a divided cell. Selective activation of the chalcogenoglycosides
<i>O</i>-Glycosidation of Telluroglycoside by Electrochemical Oxidation
作者:Shigeru Yamago、Koji Kokubo、Jun-ichi Yoshida
DOI:10.1246/cl.1997.111
日期:1997.2
The electrochemical oxidation of telluroglycosides in the presence of primary or secondary alcohols results the O-glycosidation with high efficiency. Difference of the oxidation potential is nicely accounted for that of the reactivity of armed- and disarmed-telluroglycosides.
GeCl<sub>2</sub>·Dioxane–AgBF<sub>4</sub> Catalyzed Activation of Glycosyl Fluorides for Glycosylation
作者:Qiuyu Zhu、Yu Tang、Biao Yu
DOI:10.1021/acs.orglett.2c01146
日期:2022.5.27
catalytic glycosyl fluoride activation system using the GeCl2·dioxane–AgBF4 combination was developed, which involves a reversible activation of the anomeric C–F bond by a [Ge(II)–Cl]+ cation and a reversible chloride ion transfer between Ge(II) and glycosyl cations. This catalytic glycosylation system is easy to operate, proceeds at room temperature, and offers a broad scope of substrates.