Stereospecific Uncatalyzed α-<i>O</i>-Glycosylation and α-<i>C</i>-Glycosidation by Means of a New <scp>d</scp>-Gulal-Derived α Vinyl Oxirane
作者:Valeria Di Bussolo、Micaela Caselli、Maria Rosaria Romano、Mauro Pineschi、Paolo Crotti
DOI:10.1021/jo0491152
日期:2004.10.1
The reaction of α vinyl oxirane 5, prepared through a newroute to the d-gulal system, with O-nucleophiles (alcohols and di-O-isopropylidene-α-d-monosaccharides) and C-nucleophiles (lithium alkyls) affords, in a completely stereoselective way, the corresponding 2-unsaturated α O- and C-glycosides having the same configuration as the starting epoxide.
Palladium-Catalyzed Improved Regio- and Stereoselective O-Glycosylation of D-Glucal-Derived β- and α-Vinyl Oxiranes
作者:Y. Suman Reddy、Rima Lahiri、Yashwant D. Vankar
DOI:10.1002/ejoc.201200242
日期:2012.9
3-unsaturated O-glycosides in good to excellent yields within five minutes. The above reaction has also been utilized in the synthesis of 2,3-unsaturated trisaccharides, which are potential precursors of fully oxygenated, deoxy and dideoxy sugars.