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To reconcile the urgent need to access well defined β-configured 2,6-di-deoxypyranose analogues for chemical biology, with the intrinsic α-selectivity of the native system, the directing role of fluorine at C2 has been explored. Localised partial charge inversion (C–Hδ+ → C–Fδ) elicits a reversal of the substrate-based α-stereoselectivity, irrespective of the protecting group electronics.

Graphical abstract: Fluorine-directed 1,2-trans glycosylation of rare sugars

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