我们已经发现在立体选择性O-糖基化反应的Cu(II)或Co(II)存在下1-硫糖的反应性的新模式。该方法涉及使用催化量的Cu(acac)2或Co(acac)2和Ag 2 CO 3作为α,α,α-三氟甲苯中的氧化剂。而且,该方案证明具有广泛的范围,允许以良好的至优异的产率和排他的1,2-反式选择性制备多种复杂的取代的O-糖苷酯。还证明了通过这种方法对药物进行后期修饰。为了更深入地了解反应机理,进行了循环伏安法。
Stereoselective synthesis of α- C-allyl-glycopyranosides
作者:Athanassios Giannis、Konrad Sandhoff
DOI:10.1016/s0040-4039(00)98529-0
日期:——
A simplified procedure for the synthesis of C-glycosides has been developed. Fully or partially acetylated glycopyranoses are reacted, in a single step, with allyltrimethylsilane in the presence of a Lewisacid. This method also offers the advantage that stereoselectivity can be induced by using appropriate solvents.