First Total Synthesis of Trehalose-Containing Branched Oligosaccharide OSE-1 of<i>Mycobacterium gordonae</i>(Strain 990)
作者:Manishkumar A. Chaube、Suvarn S. Kulkarni
DOI:10.1002/chem.201502521
日期:2015.9.21
The first total synthesis of the branched oligosaccharide OSE‐1 of Mycobacterium gordonae (strain 990) is reported. An intramolecular aglycon delivery approach was used for constructing the desymmetrized 1,1′‐α,α‐linked trehalose moiety. A [3+2] glycosylation of the trisaccharide donor and trehalose acceptor furnished the right hand side pentasaccharide. Regioselective O3 glycosylation of L‐rhamnosyl
Facile Oxidative Cleavage of 4-<i>O</i>-Benzyl Ethers with Dichlorodicyanoquinone in Rhamno- and Mannopyranosides
作者:David Crich、Olga Vinogradova
DOI:10.1021/jo062411p
日期:2007.4.1
On exposure to dichlorodicyanoquinone in wet dichloromethane at room temperature, equatorial 4-O-benzyl ethers are removed with moderate selectivity in the presence of other benzyl ethers in glycopyranosides and glycothiopyranosides.
Convergent synthesis of a common pentasaccharide-repeating unit corresponding to the O-specific polysaccharide of Escherichia coli O4:K3, O4:K6, and O4:K12
作者:Rajib Panchadhayee、Anup Kumar Misra
DOI:10.1016/j.tetasy.2010.04.056
日期:2010.4
A convergent chemical synthesis of a pentasaccharide found in the O-specific polysaccharide of Escherichia coli O4.K3, O4:K6, and O4:K12 has been achieved in excellent yield. A [3+2] block synthetic strategy has been adopted to couple a disaccharide donor 11 with a trisaccharide acceptor 10 for the construction of the pentasaccharide derivative 12 which on deprotection furnished target pentasaccharide 1 as its 4-methoxyphenyl glycoside Disaccharide thioglycoside donor 11 and trisaccharide acceptor 10 were prepared from suitably protected monosaccharide intermediates Yields were excellent in all steps. (C) 2010 Elsevier Ltd All rights reserved.