reacted with various thiols by irradiation with UV light in the presence of a cleavable photoinitiator. The photoinduced radical-mediated hydrothiolation reactions showed highly varying overall conversions depending not only on the substitution pattern and electron-density of the double bond but also on the nature and substitution pattern of the thiol partner. Out of the applied thiols thiophenol, producing
Silver Fluoroborate Promoted Sulfur Alkylation of β-Silyl Ethyl Sulfides. Selective Synthesis of β-Thioglycosides
作者:Anu Mahadevan、C. Li、P. L. Fuchs
DOI:10.1080/00397919408011323
日期:1994.11
Silver (I) activation of alpha-glucosyl bromide in the presence of 2-trimethylsilylethyl sulfides as sulfur nucleophiles selectively provides beta-thioglycosides.
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.
Absolute configuration of glycosyl sulfoxides
作者:Carlos A. Sanhueza、Ander C. Arias、Rosa L. Dorta、Jesús T. Vázquez
DOI:10.1016/j.tetasy.2010.06.019
日期:2010.8
A series of alkyl glycosyl sulfoxides were synthesized and analyzed by NMR and CD. The study of the configuration of the sulfur atom revealed several types of spectroscopic behavior that can be used as a criterion for this purpose. The study also pointed to CD as the preferential technique, showing clear advantages over NMR methods. A general rule for determining the absolute configuration of glycosyl sulfoxides by CD is proposed. (C) 2010 Elsevier Ltd. All rights reserved.