New C2-symmetric chiral phosphinite ligands based on amino alcohol scaffolds and their use in the ruthenium-catalysed asymmetric transfer hydrogenation of aromatic ketones
作者:Feyyaz Durap、Murat Aydemir、Duygu Elma、Akın Baysal、Yılmaz Turgut
DOI:10.1016/j.crci.2012.12.003
日期:2013.4
systems were successfully applied to ruthenium-catalyzed asymmetric transfer hydrogenation of acetophenone derivatives by iso-PrOH. Under optimized conditions, these chiral ruthenium catalyst systems serve as catalyst precursors for the asymmetric transfer hydrogenation of acetophenone derivatives in iso-PrOH and act as good catalysts, giving the corresponding optical secondary alcohols in 99% yield and
摘要 具有手性分子催化剂的酮的不对称转移氢化过程由于其操作简单而吸引了合成化学家越来越多的兴趣。C2-对称催化剂也受到了很多关注,并被用于许多反应中。已经从相应的氨基酸衍生的氨基醇或 (R)-2-氨基-1-丁醇通过三步或四步程序制备了一系列新的手性 C2 对称双(次膦酸酯)配体。它们的结构已通过多核 NMR 光谱、IR 光谱和元素分析的组合阐明。1H-31P NMR、DEPT、1H-13C HETCOR 或 1H-1H COZY 相关实验用于确认光谱归属。原位制备的钌催化体系成功应用于钌催化异PrOH对苯乙酮衍生物的不对称转移氢化。在优化条件下,这些手性钌催化剂体系作为苯乙酮衍生物在异 PrOH 中不对称转移氢化的催化剂前体,并作为良好的催化剂,以 99% 的产率和高达 79% 的 ee 得到相应的光学仲醇。