Iodine–sodium cyanoborohydride-mediated reductive ring opening of 4,6-O-benzylidene acetals of hexopyranosides
作者:Kaki Venkata Rao、Premanand R. Patil、Sridhar Atmakuri、K.P. Ravindranathan Kartha
DOI:10.1016/j.carres.2010.10.013
日期:2010.12
A quick, efficient and convenient method for the regiospecific reductiveringopening of 4,6-O-benzylidene acetals of O-/S-alkyl/aryl glycosides of mono- and disaccharides, leading to the exclusive formation of the corresponding 6-O-benzyl ethers, using sodium cyanoborohydride in the presence of molecular iodine, is reported. It has been observed that common protecting groups such as ethers and esters
The first synthesis of the hexasaccharide repeating unit of type VII group B Streptococcus capsular polysaccharide was achieved by a one-pot glycosylation strategy. The dimer of this repeating unit was also synthesized by one-pot glycosylation to achieve the backbone hexasaccharide first followed by one-pot dual glycosylations with the side-chain trisaccharide donor. All glycosylation reactions gave