C−H Bond Activation/Arylation Catalyzed by Arene-Ruthenium-Aniline Complexes in Water
作者:Chinky Binnani、Deepika Tyagi、Rohit K. Rai、Shaikh M. Mobin、Sanjay K. Singh
DOI:10.1002/asia.201600954
日期:2016.11.7
Water‐soluble arene–ruthenium complexes coordinated with readily available aniline‐based ligands were successfully employed as highly active catalysts in the C−H bond activation and arylation of 2‐phenylpyridine with aryl halides in water. A variety of (hetero)aryl halides were also used for the ortho‐C−H bond arylation of 2‐phenylpyridine to afford the corresponding ortho‐ monoarylated products as
Ligand‐Tuned C–H Bond Activation/Arylation of 2‐Arylpyridines over Pyridine‐Based
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Ligated Ruthenium–Arene Complexes
作者:Chinky Binnani、Rohit K. Rai、Deepika Tyagi、Shaikh M. Mobin、Sanjay K. Singh
DOI:10.1002/ejic.201701446
日期:2018.3.29
our investigations, including time‐dependent 1H NMRspectroscopic studies with ruthenium–arene catalysts, demonstrate a remarkable structure–activity relationship for the ligand‐tuned C–H activation/arylation of 2‐phenylpyridine, where the complexes with bischelating N,O donor‐based ligands (acteylpyridine and picolinate) outperform those with N,N donor ligands (iminopyridine). Moreover, among the N
Ruthenium‐Catalyzed C‐H Bond Activation/Arylation Accelerated by Biomass‐Derived Ligands
作者:Chinky Binnani、Shyama Charan Mandal、Biswarup Pathak、Sanjay K. Singh
DOI:10.1002/ejic.201900218
日期:2019.6.23
A variety of ligands are being explored extensively to achieve enhanced performance for ligand assisted C‐Hbond activation/functionalization reactions. We explored here several readily available biomass‐derived ligands as effective additives to significantly enhance the catalytic activity of arene‐Ru(II) dimer for ortho C‐Hbond arylation in a water‐based catalytic reaction. We achieved almost 7‐fold
人们正在广泛探索各种配体,以提高配体辅助的C–H键活化/官能化反应的性能。我们在这里探索了几种容易获得的生物质衍生的配体作为有效的添加剂,以显着增强芳烃-Ru(II)二聚体在水基催化反应中邻位C-H键芳基化的催化活性。我们在催化活性达到几乎7倍的增强与[(η 6 - p -cymene)的RuCl 2 ] 2乙酰丙酸配体存在下于80°C的催化剂。大规模研究表明原位形成了钌-乙酰丙酸酯复合物,它可能通过促进2-苯基吡啶邻位C-H键的初始活化在重要的环化钌中间体的形成中起关键作用。密度泛函理论研究还推断,配体辅助途径在能量上更有利,因为乙酰基参与了去质子化步骤。
C–H bond functionalisation with [RuH(codyl)2]BF4 catalyst precursor
作者:Wenbo Li、Percia B. Arockiam、Cedric Fischmeister、Christian Bruneau、Pierre H. Dixneuf
DOI:10.1039/c1gc15642j
日期:——
Direct catalytic diarylation with (hetero)arylhalides of arenes containing an heterocycle (pyridine, oxazoline, pyrazole) has been performed with a ruthenium catalyst assisted by a coordinating base. It constitutes a green process for cross-coupled CâC bond formation without any metal salt waste. The new catalytic system is based on [HRu(codyl)2]BF4/2KY (KY: KOAc, KOPiv, KPI (potassium phtalimide)] in which the assisting ligand Y promotes the initial cleavage of CâH bonds. It is shown that the efficiency of the Ru/2KY system strongly depends on the nature of both substrates.
在配位碱的辅助下,利用钌催化剂对含有杂环(吡啶、噁唑啉、吡唑)的炔烃的(杂)芳基卤化物进行了直接催化二芳基化反应。这是一种不产生任何金属盐废物的交叉耦合 CâC 键形成的绿色工艺。新催化体系基于[HRu(codyl)2]BF4/2KY(KY:KOAc、KOPiv、KPI(磷酰亚胺钾)],其中辅助配体 Y 可促进 CâH 键的初始裂解。研究表明,Ru/2KY 系统的效率在很大程度上取决于两种底物的性质。
Efficient Catalytic System for Ru-Catalyzed C–H Arylation and Application to a Practical Synthesis of a Pharmaceutical
作者:Masahiko Seki
DOI:10.1021/cs501328x
日期:2014.11.7
cocatalyst for Ru-catalyzed C–H arylation. Among them, K 2, 4, 6-trimethylbenzenesulfonate (TMBSK) was found to be most active, and generality of the reaction was confirmed for a variety of nitrogen-containing heterocycles to give corresponding functionalizedbiaryls in high yields. The present methodology was applied to a practicalsynthesis of Candesartan Cilexetil.