A series of chiral cyclometalated iridiumcomplexes have been synthesised by cyclometalating chiral 2-aryl-oxazoline and imidazoline ligands with [Cp*IrCl2]2. These iridacycles were studied for asymmetric transfer hydrogenation reactions with formic acid as the hydrogen source and were found to display various activities and enantioselectivities, with the most effective ones affording up to 63% ee
An efficient proline-based homogeneous organocatalyst with recyclability
作者:Qiang Li、Yuan Li、Jingdong Wang、Yingjie Lin、Zhonglin Wei、Haifeng Duan、Qingbiao Yang、Fuquan Bai、Yaoxian Li
DOI:10.1039/c7nj03912c
日期:——
organocatalyst was developed for the asymmetric reduction of imines. This catalyst could be separated by cyclodextrin-modified Fe3O4@SiO2 magnetic nanoparticles and then released back into a fresh reaction for use more than seven times. Furthermore, a new catalytic mechanism was proposed and investigated through theoretical calculations.
在这项工作中,开发了均相有机催化剂用于亚胺的不对称还原。该催化剂可通过环糊精改性的Fe 3 O 4 @SiO 2磁性纳米颗粒分离,然后释放回新鲜反应中使用七次以上。此外,提出了一种新的催化机理,并通过理论计算进行了研究。
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
METHOD FOR PRODUCING OPTICALLY ACTIVE AMINE COMPOUND
申请人:Kanto Kagaku Kabushiki Kaisha
公开号:US20130197234A1
公开(公告)日:2013-08-01
The present invention relates to methods for producing an optically active amine compound via a highly enantioselective hydrogenation reaction of an imine compound, wherein the imine compound is hydrogenated using a ruthenium metal complex having high catalytic activity and represented by Formula (1)
RuXYAB (1)
such as RuBr
2
[(S,S)-xylskewphos][(S,S)-dpen].
Highly Enantioselective Synthesis of Chiral Secondary Amines by Gold(I)/Chiral Brønsted Acid Catalyzed Tandem Intermolecular Hydroamination and Transfer Hydrogenation Reactions
作者:Xin-Yuan Liu、Chi-Ming Che
DOI:10.1021/ol901443b
日期:2009.9.17
A method for the synthesis of enantiomerically enriched secondary amines with excellent ee values through the tandem intermolecular hydroamination/transfer hydrogenation of alkynes using a “gold(I) complex−chiral Brønsted acid” protocol is developed. The catalysis works for a wide variety of aryl, alkenyl, and aliphatic alkynes as well as anilines with different electronic properties.