En route to a carbohydrate-based vaccine against Burkholderia cepacia
作者:Régis Fauré、Tze Chieh Shiao、David Lagnoux、Denis Giguère、René Roy
DOI:10.1039/b708365c
日期:——
We report a very high yielding first total synthesis of trisaccharide 5, α-D-Rhap-(1→3)-α-D-Rhap-(1→4)-α-D-Galp, corresponding to the repeating unit 1 of an O-polysaccharide present in the lipopolysaccharide of clinical isolate of Burkholderia cepacia. The approach included two successive glycosylations, based on D-rhamnosyl trichloroacetimidate donors 12 and 14. The oligosaccharide5 has been further functionalized by photochemical coupling or cross-metathesis with non-natural amino acid derivatives. Trisaccharidylamino acids 16 and 17 are now available, with the aim of preparing a novel synthetic carbohydrate-based vaccine.
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
Practical synthesis of valuable d-rhamnoside building blocks for oligosaccharide synthesis
作者:Régis Fauré、Tze Chieh Shiao、Sonia Damerval、René Roy
DOI:10.1016/j.tetlet.2007.01.122
日期:2007.3
The efficient synthesis of d-rhamnoside and the corresponding methods for its regioselective protections and deprotections have been developed in order to provide key building blocks for complex oligosaccharide syntheses toward vaccines against bacterial infections.