Preparation of chiral ligands connected with quaternary ammonium group for recyclable catalytic asymmetric transfer hydrogenation in ionic liquid

Chemical & Pharmaceutical Bulletin
Hitomi UchimotoKiyoharu Nishide

Abstract

Reuse of chiral ruthenium catalyst in catalytic asymmetric transfer hydrogenation (CATH) has attracted attention from economic and environmental viewpoints, and reactions using ionic liquids (ILs) as solvent are recognized as one of the most useful methods for reuse of the catalyst. We synthesized (1S,2S)-N-(p-toluenesulfonyl)-1,2-diphenylethylenediamine (TsDPEN) derivatives with various ionic moieties, and investigated the effect of their structure with respect to catalytic ability and recyclability in CATH with ILs. Ligand 3a having an imidazolium group showed the best results, and significant differences were observed depending on the structure of the ionic moiety or the length of the alkyl chain connecting the ligand site and the ionic moiety. Among various prochiral ketones used as substrates at various cycles, 3a showed a relatively good result.

References

Nov 25, 2000·Angewandte Chemie·P Wasserscheid, W Keim
Jul 20, 2002·The Journal of Organic Chemistry·Ying-Chun ChenAlbert S C Chan
Sep 21, 2002·Chemical Communications : Chem Comm·R Sheldon
Jul 1, 2004·Organic & Biomolecular Chemistry·Xiaofeng WuJianliang Xiao
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Mar 18, 2010·Chemistry : a European Journal·Bukuo Ni, Allan D Headley

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Citations

Aug 31, 2016·Topics in Current Chemistry·Bogdan Štefane, Franc Požgan
Apr 7, 2017·Chemical & Pharmaceutical Bulletin·Hitomi UchimotoIkuo Kawasaki
Jun 11, 2015·Chemical Reviews·Dong Wang, Didier Astruc

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