Abstract
AbstractMannopyranose‐derived methyl 1,2‐orthoacetates (R = Me) and ‐benzoates (R = Ph) can function as glycosyl donors – upon BF3·Et2O activation in CH2Cl2 – in glycosylation reactions with monosaccharide acceptors to afford disaccharides in good yields. In the process, glycosylation is preferred to acid‐catalyzed rearrangement leading to methyl mannopyranosides. Methyl 1,2‐orthoesters can be also used in regioselective glycosylation protocols with monosaccharide diols, in which they display good regioselectivity.
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