Analogues of the alpha-Glcp-(1-->3)-alpha-Glcp and alpha-Glcp-(1-->3)-alpha-Manp disaccharides (representing the two alpha-gluco linkages cleaved by alpha-Glucosidase II in N-glycan biosynthesis) in which the non-reducing-end sugar is replaced by a carbasugar and the inter-glycosidic oxygen by a sulfur were synthesised. The key coupling step was an S(N)2 displacement of an equatorial triflate at C-1 of the carbasugar by C-3 gluco or manno thiolates with inversion of configuration to giv...Expand abstract
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Carbasugar-thioether pseudodisaccharides related to N-glycan biosynthesis.
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