Efficient Palladium(0)-Catalyzed Synthesis of Alkenyl 1-Thioglycosides and Thiodisaccharides
作者:Anna Zawisza、Boguslaw Kryczka、Paul Lhoste、Stanislaw Porwanski、Denis Sinou
DOI:10.1080/07328300008544118
日期:2000.1
Unsaturated thiodisaccharides are obtained in good yields by alkylation of ethyl alpha-Q-Delta(2)-glycosides, having a leaving group at C-4, with various thiocarbohydrates in the presence of a catalytic amount of palladium(0). The reaction is regio- and stereospecific for the alpha-erythro enoside, and only stereospecific in the case of the alpha-threo enoside, alkylation occurring at C-4 and C-2. In all cases, only the beta-anomer is formed.