Regioselective activation of glycosyl acceptors by a diarylborinic acid-derived catalyst |
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Authors: | Gouliaras Christina Lee Doris Chan Lina Taylor Mark S |
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Institution: | Department of Chemistry, University of Toronto, Ontario, Canada. |
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Abstract: | A derivative of diphenylborinic acid promotes catalytic, regioselective Koenigs-Knorr glycosylations of carbohydrate derivatives bearing multiple secondary hydroxyl groups. Robust levels of selectivity for the equatorial OH group of cis-1,2-diol motifs are demonstrated in reactions of seven acceptors derived from galactose, mannose, fucose, and arabinose using a variety of glycosyl halide donors. Catalyst control presents a new means of generating defined glycosidic linkages from unprotected or minimally protected carbohydrate feedstocks. |
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