An efficient strategy has been developed for the synthesis of the pentasaccharide
repeating unit of the cell-wall polysaccharide of Escherichia coli O166 strain through sequential stereoselective glycosylations of monosaccharide intermediates.
All the glycosylation steps were high-yielding with high stereoselectivities.
Key words
carbohydrates - glycosylations - glycosides - stereoselectivity - oligosaccharides