Boullanger P, Maunier V, Lafont D. Syntheses of amphiphilic glycosylamides from glycosyl azides without transient reduction to glycosylamines.
Carbohydr Res 2000;
324:97-106. [PMID:
10702876 DOI:
10.1016/s0008-6215(99)00284-0]
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Abstract
Protected glycosyl azides react with acyl chlorides in the presence of triphenylphosphine to afford glycosylamides in high yields, at room temperature. Starting from the beta-glycosyl azides, the reaction is highly stereoselective and occurs with retention of configuration, whereas the alpha-azido anomers display a lower stereoselectivity giving rise to alpha/beta mixtures of glycosylamides. The reaction was applied to several monosaccharidic azides and to lactosyl azide with various acyl chlorides; it was shown to be of general use for preparing 1,2-trans beta-glycosylamides.
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