Reversing Reactivity: Stereoselective Desulfurative 1,2-<i>trans</i>-<i>O</i>-Glycosylation of Anomeric Thiosugars with Carboxylic Acids under Copper or Cobalt Catalysis
作者:Nedjwa Bennai、Amélie Chabrier、Maha I. Fatthalla、Christine Tran、Expédite Yen-Pon、Mohamed Belkadi、Mouâd Alami、Laurence Grimaud、Samir Messaoudi
DOI:10.1021/acs.joc.0c00766
日期:2020.7.17
We have discovered a new mode of reactivity of 1-thiosugars in the presence of Cu(II) or Co(II) for a stereoselective O-glycosylation reaction. The process involves the use of a catalytic amount of Cu(acac)2 or Co(acac)2 and Ag2CO3 as an oxidant in α,α,α-trifluorotoluene. Moreover, this protocol turned out to have a broad scope, allowing the preparation of a wide range of complex substituted O-glycoside
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。