Radicals, generated from isopropylidene uronic esters of 2-thiopyridone, add readily to electron-poor alkenes in a stereospecific fashion, leading to functionalised chain-elongated furanosides and D-ribonucleosides through carbon-4; the acetal group has a directive effect in controlling chirality.
D. H. R. Barton, S. D. Géro, B. Quiclet-Sire and M. Samadi, J. Chem. Soc., Chem. Commun., 1988, 1372 DOI: 10.1039/C39880001372
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