A route to unsaturated spiroketals from phenylthio hex-2-enopyranosides via sequential alkylation, allylic rearrangement and intramolecular glycosidation

Abstract
Alkylated phenylthio hex-2-enopyranosides readily undergo 1,3-phenylthio migration, and treatment of the resulting enol ether with N-iodosuccinimide gives an allyl-oxocarbenium ion which can be trapped intramolecularly by a suitably located hydroxy group to yield an unsaturated spiroketal.

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