Aluminium triflate catalysed O-glycosidation: temperature-switched selective Ferrier rearrangement or direct addition with alcohols
作者:D. Bradley G. Williams、Sandile B. Simelane、Henok H. Kinfe
DOI:10.1039/c2ob25540e
日期:——
A temperature-controlled mechanism switch between the Al(OTf)3-catalysed direct addition of alcohols or the Ferrier rearrangement reactions in some glycals is presented. The scope and limitations are investigated as are the influence of the stereochemistry and nature of the protecting groups on the glycal substrate.
Facile O-glycosylation of glycals using Glu-Fe<sub>3</sub>O<sub>4</sub>-SO<sub>3</sub>H, a magnetic solid acid catalyst
作者:Raju S. Thombal、Vrushali H. Jadhav
DOI:10.1039/c6ra03305a
日期:——
A new glucose derived magnetic solid acidcatalyst (Glu-Fe3O4-SO3H) was synthesized in a convenient and ecofriendly manner and well characterized using FTIR, PXRD, EDAX, SEM, and XPS which showed the presence of Fe3O4 embedded on the surface of the catalyst along with –SO3H, –OH and –COOH functional groups. This new heterogeneous catalyst was studied for synthesis of 2-deoxy galactosides/glucosides
以方便,环保的方式合成了一种新型的葡萄糖衍生磁性固体酸催化剂(Glu-Fe 3 O 4 -SO 3 H),并通过FTIR,PXRD,EDAX,SEM和XPS对其进行了很好的表征,表明存在Fe 3 O 4与–SO 3 H,–OH和–COOH官能团一起嵌入催化剂表面。研究了这种新型多相催化剂,用于合成2-脱氧半乳糖苷/葡糖苷,具有良好的收率和选择性。而且,催化剂可以容易地用外磁力从反应中分离出来,并至少可重复使用四次,而每次循环后产物的产率没有任何明显的降低。