Asymmetric Transfer Hydrogenation of (Hetero)arylketones with Tethered Rh(III)–<i>N</i>-(<i>p</i>-Tolylsulfonyl)-1,2-diphenylethylene-1,2-diamine Complexes: Scope and Limitations
A series of new tethered Rh(III)/Cp* complexes containing the N-(p-tolylsulfonyl)-1,2-diphenylethylene-1,2-diamine ligand have been prepared, characterized, and evaluated in the asymmetric transfer hydrogenation (ATH) of a wide range of (hetero)aryl ketones. The reaction was performed under mild conditions with the formic acid/triethylamine (5:2) system as the hydrogen source and provided enantiomerically
Efficient Access to Chiral Benzhydrols via Asymmetric Transfer Hydrogenation of Unsymmetrical Benzophenones with Bifunctional Oxo-Tethered Ruthenium Catalysts
A concise asymmetric transfer hydrogenation of diaryl ketones, promoted by bifunctional Ru complexes with an etherial linkage between 1,2-diphenylethylenediamine (DPEN) and η(6)-arene ligands, was successfully developed. Because of the effective discrimination of substituents at the ortho position on the aryl group, unsymmetrical benzophenones were smoothly reduced in a 5:2 mixture of formic acid and
directing group (bromo group) showcased the potential application of this substrate‐controlled bioreduction reaction. The combined use of substrateengineering and protein engineering, was demonstrated to be a useful strategy in efficiently improving stereoselectivity or switching stereopreference of enzymatic processes.
Synthesis and electrochemical characterization of iminophosphine-based ruthenium(II) complexes and application in asymmetric transfer hydrogenation reaction as catalysts
作者:Mustafa Keleş、Hülya Keleş、Mustafa Kemal Yılmaz
DOI:10.1007/s13738-018-1569-7
日期:2019.5
A range of Ru(II) complexes have been prepared with chiral iminophosphine ligands ([(2-PPh2)C6H4CH=NCH(CH3)C6H5(4-R)]; R = –H, p-CH3, p-NO2) and characterized by 1H, 13C, 31P1H} NMR and FTIR spectroscopy. The electrochemical properties of the [Ru(PN)2Cl2] complexes were investigated in ACN/TBAP solution with cyclic voltammetry and square wave voltammetry techniques. The use of chiral [Ru(PN)2Cl2] complexes
制备了一系列手性亚氨基膦配体([[2-PPh 2)C 6 H 4 CH = NCH(CH 3)C 6 H 5(4-R)]; R = –H,p -CH 3,p -NO 2),并通过1 H,13 C,31 P 1 H} NMR和FTIR光谱表征。用循环伏安法和方波伏安法研究了[Ru(PN)2 Cl 2 ]配合物在ACN / TBAP溶液中的电化学性质。手性[Ru(PN)2 Cl的使用[2 ]在2-丙醇中研究了作为芳香族和脂肪族酮不对称转移加氢催化剂的配合物,以试图证明取代基(其连接至与氮供体键合的苯环上)对催化活性和对映选择性的影响。可以看出,这些取代基的电子效应对钌(II)催化剂的催化效率没有贡献。
Synthesis and Catalytic Asymmetric Applications of Quinazolinol Ligands
range of chiral quinazolinol ligands were efficiently synthesized and subsequently investigated for catalyticchiral induction in both the asymmetric phenylation of arylaldehydes and the asymmetric epoxidation of chalcones. Encouragingly, high enantioselectivities (up to 95%) and yields (up to 98%) were achieved under the optimized reaction conditions. A range of chiral quinazolinol ligands were efficiently