The present invention relates to an iridium-based catalyst compound for hydrogenating reducible moieties, especially imines and iminiums, the catalyst compounds being defined by the formula: (Formula (I)) where ring B is a conjugated ring system with one or more substituents. The catalysts of the invention are particularly effective in reductive amination procedures which involve the in situ generation of the imine or iminium under reductive hydrogenative conditions.
Cyclometalated Half-Sandwich Iridium Complex for Catalytic Hydrogenation of Imines and Quinolines
作者:Zi-Jian Yao、Nan Lin、Xin-Chao Qiao、Jing-Wei Zhu、Wei Deng
DOI:10.1021/acs.organomet.8b00553
日期:2018.11.12
iridium-based catalysts for imines and quinoline derivatives reduction have been prepared through metal-mediated C–H bond activation based on benzothiazole ligands. These iridium complexes exhibited high catalytic activity for hydrogenation of various types of imines with high yields. The most active catalyst was obtained from methoxyl substituted complex 2, showing the catalytic TOF value of 975 h–1 for
通过基于苯并噻唑配体的金属介导的CH键活化,已经制备了几种用于亚胺和喹啉衍生物还原的C,N-螯合环金属化半三明治铱基催化剂。这些铱配合物对各种类型的亚胺的氢化显示出高催化活性。活性最高的催化剂是从甲氧基取代的配合物2获得的,对于还原亚胺6a的催化TOF值为975 h –1。另外,这些半三明治配合物还显示出对N-杂环喹啉衍生物的催化加氢的高效率。对于具有给电子或吸电子基团的各种底物显示出良好的催化活性。配合物1 - 5被完全表征通过NMR,IR和元素分析。通过X射线衍射分析进一步证实了配合物1和4的分子结构。
Cooperative Catalysis: Combining an Achiral Metal Catalyst with a Chiral Brønsted Acid Enables Highly Enantioselective Hydrogenation of Imines
作者:Weijun Tang、Steven Johnston、Chaoqun Li、Jonathan A. Iggo、John Bacsa、Jianliang Xiao
DOI:10.1002/chem.201302437
日期:2013.10.11
Asymmetric hydrogenation of imines leads directly to chiral amines, one of the most important structural units in chemical products, from pharmaceuticals to materials. However, highly effective catalysts are rare. This article reveals that combining an achiral pentamethylcyclopentadienyl (Cp*)–iridium complex with a chiral phosphoric acid affords a catalyst that allows for highly enantioselective hydrogenation
[EN] CATALYST COMPOUNDS<br/>[FR] COMPOSÉS DE TYPE CATALYSEUR
申请人:UNIV LIVERPOOL
公开号:WO2013153408A1
公开(公告)日:2013-10-17
The present invention relates to an iridium-based catalyst compound for hydrogenating reducible moieties, especially imines and iminiums, the catalyst compounds being defined by the formula: (Formula (I)) where ring B is a conjugated ring system with one or more substituents. The catalysts of the invention are particularly effective in reductive amination procedures which involve the in situ generation of the imine or iminium under reductive hydrogenative conditions.