Asymmetric Hydrogenation of Aryl Perfluoroalkyl Ketones Catalyzed by Rhodium(III) Monohydride Complexes Bearing Josiphos Ligands
作者:Fabian Brüning、Haruki Nagae、Daniel Käch、Kazushi Mashima、Antonio Togni
DOI:10.1002/chem.201902585
日期:2019.8.14
The asymmetric hydrogenation of 2,2,2-trifluoroacetophenones and aryl perfluoroalkyl ketones was developed using a unique, well-defined chloride-bridged dinuclear rhodium(III) complex bearing Josiphos-type diphosphine ligands. These complexes were prepared from [RhCl(cod)]2 , Josiphos ligands, and hydrochloric acid. As catalyst precursors, they allow for the efficient and enantioselective synthesis
2,2,2-三氟苯乙酮和芳基全氟烷基酮的不对称氢化反应是使用独特的,定义明确的带有Josiphos型二膦配体的氯桥联二核铑(III)络合物开发的。这些配合物是由[RhCl(cod)] 2,Josiphos配体和盐酸制备的。作为催化剂的前体,它们允许具有全氟烷基的手性仲醇的有效和对映选择性合成(最高99%ee)。该系统不需要用于2,2,2-三氟苯乙酮氢化的活化碱。另外,首次报道了2-苯基-3-(卤代乙酰基)吲哚的对映选择性C = O氢化,这是药物化学中的一类特权结构。