Stereoselective 1,2-<i>CIS</i>-1-Thioglycosidation of Aldohexoses with<i>Tert</i>-Butyl Mercaptan in 90% Trifluoroacetic Acid
作者:Muneaki Yanase、Masuo Funabashi
DOI:10.1080/07328300008544064
日期:2000.1
tert-Butyl 1,2-cis-1-thioglycopyranosides of various aldohexoses (D-glucose, D-galactose, D-mannose, and L-rhamnose), and disaccharides (cellobiose, lactose, and maltose) were preferentially prepared in good yields by reacting the corresponding free sugars with tert-butyl mercaptan in 90% trifluoroacetic acid at room temperature. No selectivity, however, was ob served at all in the case of 2-deoxy-D-arabino-hexopyranose. A possible mechanism for the 1,2-cis-selectivity was discussed from a standpoint of thermodynamic and kinetic control.