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  • Title: ZnI2-Mediated β-Galactosylation of C2-Ether-Type Donor.
    Author: Zhou S, Ao J, Guo A, Zhao X, Deng N, Wang G, Yang Q, Ishiwata A, Liu XW, Li Q, Cai H, Ding F.
    Journal: Org Lett; 2022 Nov 04; 24(43):8025-8030. PubMed ID: 36282514.
    Abstract:
    Conventional glycosylation with galactosyl donors having C-2 benzyl (Bn) ether-type functionality often leads to anomeric mixtures, due to the anomeric and steric effects that stabilize the 1,2-cis-α- and 1,2-trans-β-glycosides, respectively. Herein we report a versatile ZnI2-directed β-galactosylation approach employing a 4,6-O-tethered and 2-O-Bn galactosyl donor for the stereoselective and efficient synthesis of β-O-galactosides. With a broad substrate scope, the reaction tolerates a wide range of functional groups and complex molecular architectures, providing stereocontrolled β-galactosides in moderate to excellent yields. The practicality of this transformation is demonstrated through the synthesis of a tetrasaccharide arabinogalactan fragment with high stereoselectivity.
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