Abstract
Herein we present a systematic study of l‐rhamnosylation. The influence of protective groups, reactivity, solvents and glycosylation method, i.e. catalytic versus promoted glycosylation, are studied. It was found that the selectivity can be controlled to a large extend, by varying these parameters and hence the same donor can give both anomers. A reversal of the influence of the participating solvents is observed, and hence ethereal solvents increase the β selectivity, whereas nitrile solvents give almost exclusive α‐selectively.
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