Open-Air Stereoselective Construction of <i>C</i>-Aryl Glycosides

Abstract

A new methodology of stereoselective <i>C</i>-glycosylation has been developed with 3,4-<i>O</i>-carbonate glycals and boronic acids, catalyzed by 1,2-bis(phenylsulfinyl)ethane palladium(II) acetate under open-air conditions at room temperature. This mild method is simple in operation, wide in substrate range, and tolerant in alcoholic/phenolic hydroxyl and amino groups. High to excellent yields were observed for all substrates tested, with the driving force mainly contributed by decarboxylation. Meanwhile, the high 1,4-<i>trans</i>-selectivity was achieved by steric effects as proposed.