A straightforward synthesis of the tetrasaccharide repeatingunit of the O-antigen of the Escherichia coli O69 strain as its 2-aminoethyl glycoside has been accomplished by carrying out two iterative glycosylations in one pot. The stereochemical outcome of the glycosylations was very good. The conformational analysis of the synthesized tetrasaccharide was carried out using NOE based two-dimensional
Synthesis of trisaccharide and a tetrasaccharide repeating unit corresponding to the O-antigen of Shiga toxin producing Escherichia coli O177
作者:Manas Jana、Anup Kumar Misra
DOI:10.1016/j.tet.2015.04.042
日期:2015.6
A trisaccharide and a tetrasaccharide repeatingunit corresponding to the cell wall O-antigen of verotoxin producing Escherichia coli O177 strain have been synthesized in excellent yield using sequential stereoselective glycosylation strategy. A common trichloroacetimidate intermediate has been used for the incorporation of two l-fucosamine moieties in the target molecules.