Abstract
Abstract Lewis-acid promoted intramolecular N1 glycosylation to form the novel O6,5′-cyclonucleoside 1a occurs in high yield from the corresponding acyclic thiophenyl-glycoside 12. The relative stability of the O6,5′ tether compared with O2,5′ and O2,3′ tethers is reported. Cleavage of the anhydro bond was effected with aqueous base to yield the 4-methoxybarbituric acid nucleoside analogue 14.
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