Rhodium catalysts derived from a fluorinated phanephos ligand are highly active catalysts for direct asymmetric reductive amination of secondary amines
作者:Sophie H. Gilbert、Sergey Tin、José A. Fuentes、Tamara Fanjul、Matthew L. Clarke
DOI:10.1016/j.tet.2020.131863
日期:2021.1
An asymmetric hydrogenation of enamines is efficiently catalysed by rhodium complexed with a fluorinated version of the planar chiral paracyclophane-diphosphine ligand, Phanephos. This catalyst was shown to be very active, with examples operating at just 0.1 mol% of catalyst. This catalyst was then successfully adapted to Direct Asymmetric Reductive Amination, leading to the formation of several tertiary
铑与平面手性对环烷二膦配体Phanephos的氟化形式络合,有效地催化了烯胺的不对称氢化。该催化剂显示出非常高的活性,实施例仅在催化剂的0.1mol%下操作。然后,如果使用活化的酮/胺配偶体,则该催化剂成功地适应于直接不对称还原胺化反应,导致形成几种具有中等ee的叔胺。