Preparation of chiral ligands connected with quaternary ammonium group for recyclable catalytic asymmetric transfer hydrogenation in ionic liquid
| Autor: | Shunsaku Ohta, Hiroyuki Yasui, Hitomi Uchimoto, Tomoko Tsuji, Kiyoharu Nishide, Kenji Arimitsu, Ikuo Kawasaki, Masayuki Yamashita |
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| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Ligand Ionic bonding Ionic Liquids Green Chemistry Technology Stereoisomerism General Chemistry General Medicine Transfer hydrogenation Ligands Combinatorial chemistry Catalysis Solvent Quaternary Ammonium Compounds chemistry.chemical_compound chemistry Drug Discovery Ionic liquid Moiety Organic chemistry Hydrogenation Alkyl |
| Zdroj: | Chemicalpharmaceutical bulletin. 63(3) |
| ISSN: | 1347-5223 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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