A nitro sugar derivative route to 2-thioepisophorose and 2-thiosophorose and their remarkable facile epimerization
作者:Mária Petrušová、Erika Lattová、Mária Matulová、Ladislav Petruš、James N. BeMiller
DOI:10.1016/0008-6215(95)00395-9
日期:1996.3
These, after deacetylation, were transformed by the Nef reaction to 2-thioepisophorose and 2-thiosophorose, respectively. The 2-thiodisaccharides easily epimerize in aqueous sodium bicarbonate at ambient temperature to a 1:4 equilibrium mixture. The predominant 2-thiosophorose was obtained crystalline. A 1H NMR study of the epimerization in deuterium oxide showed that the reaction involves an H-2 proton