Preparation of Chiral Ligands Connected with Quaternary Ammonium Group for Recyclable Catalytic Asymmetric Transfer Hydrogenation in Ionic Liquid
作者:Hitomi Uchimoto、Tomoko Tsuji、Ikuo Kawasaki、Kenji Arimitsu、Hiroyuki Yasui、Masayuki Yamashita、Shunsaku Ohta、Kiyoharu Nishide
DOI:10.1248/cpb.c14-00747
日期:——
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
从经济和环境的角度来看,手性钌催化剂在催化不对称转移加氢(CATH)中的再利用引起了人们的关注,使用离子液体(ILs)作为溶剂的反应被认为是最有效的催化剂再利用方法之一。我们合成了具有各种离子部分的(1S,2S)-N-(对甲苯磺酰基)-1,2-二苯基乙二胺(TsDPEN)衍生物,并研究了其结构对具有ILs的CATH的催化能力和可回收性的影响。具有咪唑鎓基团的配体3a显示最佳结果,并且根据离子部分的结构或连接配体位点和离子部分的烷基链的长度观察到显着差异。在各种循环中用作底物的各种前手性酮中,