Asymmetric Hydrogenation of α-Amino Esters into Optically Active β-Amino Alcohols through Dynamic Kinetic Resolution Catalyzed by Ruthenabicyclic Complexes
作者:Hiroki Ishikawa、Taiga Yurino、Ryo Komatsu、Ming-Yuan Gao、Noriyoshi Arai、Taichiro Touge、Kazuhiko Matsumura、Takeshi Ohkuma
DOI:10.1021/acs.orglett.3c00740
日期:——
Racemic α-substituted α-amino esters were hydrogenated into enantioenriched β-amino alcohols through dynamic kinetic resolution with chiral ruthenabicyclic complexes. The reaction was carried out with a substrate/catalyst molar ratio of 200–1000 under 15 atm of H2 at 25 °C to afford a variety of β-substituted β-aminoethanols in up to 96% ee (24 examples). The mechanistic studies including deuteration
通过手性钌双环配合物的动态动力学拆分,将外消旋 α-取代的 α-氨基酯氢化为富含对映体的 β-氨基醇。在 15 atm H 2和 25 °C下,底物/催化剂摩尔比为 200–1000 的情况下进行反应,以提供高达 96% ee 的各种 β-取代的 β-氨基乙醇(24 个示例)。包括氘化实验在内的机理研究表明,该反应是通过 α-氨基乙酸酯中间体的 1,2-氢化物迁移到 α-羟基亚胺,然后亚氨基化合物不断还原,得到氨基醇产物。