Asymmetric Hydrogenation of N-Arylimines Catalyzed by the Xyl-Skewphos/DPEN-Ruthenium(II) Complex
作者:Noriyoshi Arai、Noriyuki Utsumi、Yuki Matsumoto、Kunihiko Murata、Kunihiko Tsutsumi、Takeshi Ohkuma
DOI:10.1002/adsc.201200464
日期:2012.8.13
The new catalyst system of RuBr2[(S,S)-xyl-skewphos][(S,S)-dpen] and potassium tert-butoxide shows high reactivity and enantioselectivity in the hydrogenation of N-arylimines [Xyl-Skewphos=2,4-bis(di-3,5-xylylphosphino)pentane, DPEN=1,2-diphenylethylenediamine]. A range of imines derived from aromatic and heteroaromatic ketones as well as some ferrocenyl and vinylic imines are hydrogenated with a turnover
RuBr 2 [(S,S)-xyl-skewphos] [(S,S)-dpen]和叔丁醇钾的新型催化剂体系在N-芳胺的加氢反应中表现出高反应活性和对映选择性[Xyl-Skewphos = 2 ,4-双(二-3,5-二甲苯基膦基)戊烷,DPEN = 1,2-二苯基乙二胺]。在10–50 atm的氢气下,将一系列衍生自芳族和杂芳族酮的亚胺以及一些二茂铁基和乙烯基亚胺进行氢化,其周转数高达18,000,以提供高达99%对映体过量的胺产物。该反应用于手性N的合成-芳基胺,它是生物活性化合物的合成中间体。对映体的模式通过使用基于Xyl-Skewphos / DPEN-RuBr 2络合物的X射线结构的过渡态模型来解释。