Straightforward synthesis of the pentasaccharide repeating unit of the cell wall O-antigen of Escherichia coli O43 strain
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A concise synthetic strategy has been developed for the synthesis of the pentasaccharide repeating unit of the cell wall O-antigen of Escherichia coli O43 strain involving stereoselective β-D-mannosylation and α-L-fucosylation using corresponding trichloroacetimidate intermediates and perchloric acid supported over silica (HClO4-SiO2) as glycosylation promoter. The yield and stereoselectivity of the glycosylations were very good.
Keywords: Diarrhea; E. coli; Glycosylation; O-antigen; Oligosaccharide.