Synthetic Approaches to Novel Thiosugar Scaffolds Containing α,β-Unsaturated Carbonyl Groups
作者:Nuno M. Xavier、Paulo J. A. Madeira、M. Helena Florêncio、Amélia P. Rauter
DOI:10.1002/ejoc.200900573
日期:2009.10
3-uloses by practical and reliable approaches. The reaction sequence used for the bicyclic fused derivatives involved Wittig olefination of protected pento- or hexofuran-3-uloses, introduction of a sulfhydryl group at C-5 of the intermediate unsaturated ester and acid-promoted deprotection, which allowed intramolecular lactonization and conversion into the 5-thiopyranose form. For the synthesis of