Cycloglycosidation of 1,2-unsaturated maltohexaose and maltoheptaose derivatives with iodonium addition. Conversion of α- and β-cyclodextrins into mono(2-deoxy) derivatives via acyclic intermediates

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Abstract
Iodonium ion treatment of 1,2-unsaturated heptadeca-O-benzylmaltohexaose and icosa-O-benzylmaltoheptaose derivatives derived from α- and βcyclodextrins brought about their recyclization by intramolecular glycosidation, giving mono(2-deoxy-2-iodo)-α- and -β-cyclodextrin derivatives, which were converted into mono(2-deoxy)-α- and -β-cyclodextrins by radical reduction.