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.
Synthesis of 1-O-acylaldoses by the reaction of carboxylic acids with 1,2-orthoacetates, or with aldoses in the presence of triflouroacetic anhydride
作者:Jacques Leroux、Arthur S. Perlin
DOI:10.1016/s0008-6215(00)85601-3
日期:1981.7
Micheel; Baum, Chemische Berichte, 1955, vol. 88, p. 2020,2024
作者:Micheel、Baum
DOI:——
日期:——
Reversing Reactivity: Stereoselective Desulfurative 1,2-<i>trans</i>-<i>O</i>-Glycosylation of Anomeric Thiosugars with Carboxylic Acids under Copper or Cobalt Catalysis
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。
Stevioside. III. The Anomeric 2,3,4,6-Tetra-O-acetyl-1-O-mesitoyl-D-glucopyranoses and their Behavior with Alkali<sup>1,2</sup>