Modular Furanoside Pseudodipeptides and Thioamides, Readily Available Ligand Libraries for Metal-Catalyzed Transfer Hydrogenation Reactions: Scope and Limitations
作者:Mercedes Coll、Katrin Ahlford、Oscar Pàmies、Hans Adolfsson、Montserrat Diéguez
DOI:10.1002/adsc.201100766
日期:2012.2
successful ligand families developed for the ATH. As well as studying the effect of these two ligand structures on the catalytic performance, we also evaluated the effect of modifying several of the ligand parameters. We found that the effectiveness of the ligands at transferring the chiral information in the product can be tuned by correctly choosing the ligand components (ligand structure and ligand parameters)
已经合成了两个新的基于高度模块化碳水化合物的伪二肽和硫代酰胺配体库,用于铑和钌催化的前手性酮的不对称转移氢化(ATH)。这些系列的配体可以从容易获得的D-木糖和D-葡萄糖有效地制备。配体库包含两个主要的配体结构(伪二肽和硫代酰胺),这些结构是通过对为ATH开发的最成功的配体家族之一进行系统修饰而设计的。除了研究这两个配体结构对催化性能的影响外,我们还评估了修改一些配体参数的效果。我们发现,可以通过正确选择配体成分(配体结构和配体参数)来调整配体在产品中传递手性信息的有效性。优异的对映选择性(因此,使用多种底物在醇产物的两种对映异构体中均获得了高达99%的ee值)。