Ruthenium complexes of new chiral phosphine‐amine‐ether ligands (Ru‐PNO) for asymmetric hydrogenation – the role of backbone chirality in pincer ligand design
作者:Zsófia Császár、Zsanett E. Pőrgye、Evelin Tóth‐Farsang、Margit Kovács、Attila C. Bényei、József Bakos、Gergely Farkas
DOI:10.1002/aoc.7379
日期:2024.3
essential element of stereochemical communication in outer sphere bifunctional catalysis. The new complexes were applied in the asymmetric hydrogenation of fused ring bicyclic ketones (i.e., 1-tetralone and 4-chromanone derivatives), a challenging substrate class, where enantioselectivities up to 97% could be obtained. Based on the spectroscopic and theoretical studies and catalytic experiments, structural
通式为 Ph 2 PCH(R 1 )(CH 2 ) n CH(R 1 )N(R 2 )CH(R 3 )CH 2 OMe的新型手性膦胺醚 (PNO) 配体,其中 R 1、 R 2和R 3 = H或Me,n = 0或1,并且已经合成了它们的[RuCl 2 (PPh 3 )(PNO)] 类型的钌配合物。配位化合物通过 1D 和 2D NMR 光谱进行表征,通过 DFT 计算建模,并在一种情况下通过 X 射线晶体学进行分析。结合光谱和理论研究表明,P-N和N-O主链中立体元素的相对构型是决定钳型螯合物构象的关键因素,也可能影响协调立体氮的构型NH 亚基中的 NH 亚基,是外层双功能催化中立体化学通讯的重要元素。新配合物应用于稠环双环酮(即1-四氢萘酮和4-苯并二氢吡喃酮衍生物)的不对称氢化,这是一种具有挑战性的底物类别,可以获得高达97%的对映选择性。基于光谱和理论研究以及催化实验,可以确定影响