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De Novo Asymmetric Synthesis of an α-6-Deoxyaltropyranoside as Well as its 2-/3-Deoxy and 2,3-Dideoxy Congeners
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2009
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BiosynthesisEngineeringBiochemistryBenzyl Alpha-digitoxopyranosideNatural SciencesDiversity-oriented SynthesisGlycobiologyGlycosylation ReactionOrganic Chemistry2,3-Dideoxy CongenersStereoselective SynthesisPharmacologyAsymmetric CatalysisSynthetic ChemistryEnantioselective SynthesisBiomolecular EngineeringCommon Pyranone IntermediateNatural Product Synthesis
A highly divergent de novo asymmetric synthesis of benzyl alpha-6-deoxyaltropyranoside, benzyl alpha-ascarylopyranoside, benzyl alpha-amicetopyranoside, and benzyl alpha-digitoxopyranoside has been achieved via a common pyranone intermediate. The routes rely upon a palladium(0)-catalyzed glycosylation reaction and corresponding post-glycosylation transformations. The control of the absolute and relative stereochemical configuration came from a Noyori reduction of 2-acylfuran and subsequent diastereoselective introduction of other stereogenic centers.