Add time:08/30/2019         Source:sciencedirect.com

By using Hf(OTf)4 as the catalyst, a series of 2,3-unsaturated-Se-glucosides have been synthesized for the first time from tri-O-acetyl-d-glucal, 2,4,6-tri-O-benzyl-d-glucal, 3,4-di-O-acetyl-l-rhamnal and ((2R,3S)-3-acetoxy-2,3-dihydrofuran-2-yl) methyl acetate with PhSeH or alkyl(aryl) hydroselenides as the nucleophile in good yield and high anomeric selectivity.

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