A New Access to Polyhydroxylated Pyrrolidines from Epoxyaldehydes

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Abstract
Our approach relies on the stereocontrolled vinylation of a chiral α,β-epoxyimine derived from the corresponding aldehyde. Regioselective opening of the oxirane with carbonate anion allowed the formation of an oxazolidinone intermediate from which the glucosidase inhibitor 1,4-dideoxy-1,4-imino-d-glucitol (14) was synthesised. Direct cyclisation into a 2-vinyl-3,4-epoxypyrrolidine afforded a valuable intermediate for the preparation of synthetic azasugar analogues.

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