Electrochemical Reduction in an Aprotic Medium of New Functionalized Amphiphilic Molecules Derived from Sugars: Stereoselective Pinacolization and an Example of a Glycosidic Carbon-Oxygen Bond Cleavage
作者:Catherine Maurice、Bernd Schöllhorn、Isabelle Canet、Guy Mousset、Christine Mousty、Jérôme Guilbot、Daniel Plusquellec
DOI:10.1002/(sici)1099-0690(200003)2000:5<813::aid-ejoc813>3.0.co;2-q
日期:2000.3
derivatives, performed in an aprotic solvent (DMF), yield the pinacols possessing two glycosidic side chains. Under the same conditions of electrolysis with the D-glucurone derivative, the glyosidic carbon-oxygen bond is cleaved. The use of a redox mediator (couple anthracene−•/anthracene) has demonstrated that a glucosidic bond can be reduced by a homogeneous electron transfer. In the presence of a proton
通过施密特缩合和未保护的内酯与适当底物的反应,分别合成了衍生自 D-葡萄糖和 D-呋喃葡萄糖醛酸-6,3-内酯(D-葡萄糖醛酸)的可电还原的两亲芳香酮。在非质子溶剂 (DMF) 中进行的葡萄糖衍生物的宏观电解产生具有两个糖苷侧链的频哪醇。在与 D-葡萄糖醛酸衍生物相同的电解条件下,糖苷碳氧键被裂解。氧化还原介质(偶蒽-•/蒽)的使用已经证明糖苷键可以通过均相电子转移减少。在质子供体存在下,获得预期的 D-葡萄糖醛酸频哪醇。自由基-自由基偶联涉及两个手性中心的形成。