Synthesis of Highly Condensed Polycyclic Carbohydrates by Reaction of a Spirocyclic Enamino Sulfonate Derived from <scp>d</scp>-Xylofuranose with Bifunctional Reagents
作者:Alessandra Cordeiro、María Luisa Jimeno、Miguel A. Maestro、María-José Camarasa、Ernesto Quesada、Ana San-Félix
DOI:10.1021/jo701775a
日期:2007.12.1
5-O-tosyl derivative (1), easily prepared from 1,2-O-isopropylidene-α-d-xylofuranose, serves as a useful precursor for the preparation of highly condensed cyclic carbohydrates. The synthesis involves a first cyclization of the 5-O-tosyl sugar derivative 1 to a highly reactive cyclic enamine, which subsequently undergoes the nucleophilic attack of a bifunctional reagent X(CH2)nZ in a regio- and stereospecific