Ruthenium(II) Acetate Catalyst for Direct Functionalisation of sp2-CH Bonds with Aryl Chlorides and Access to Tris- Heterocyclic Molecules
作者:Franc Požgan、Pierre H. Dixneuf
DOI:10.1002/adsc.200900350
日期:——
generated (p-cymene)ruthenium diacetate [Ru(OAc)2(p-cymene)] catalyst 2, prepared from the (p-cymene)ruthenium dichloride dimer [RuCl2(p-cymene)]2, 1} and potassium acetate (KOAc), acts as an excellent catalyst for ortho CH bond functionalisation of 2-pyridylbenzene with unactivated arylchlorides in the presence of potassium carbonate (K2CO3). Quantitative diarylation can be reached in 1 h at 120 °C. The
该原位生成的(p -cymene)二乙酸钌的[Ru(OAc)2(p -cymene)]催化剂2,从(制备p -cymene)二氯化钌二聚体将[RuCl 2(p -cymene)] 2,1 }和乙酸钾(乙酸钾),充当极好的催化剂邻2- pyridylbenzene在碳酸钾的存在下未活化的芳基氯化物的CH键官能(K 2 CO 3)。在120°C下1 h即可达到定量二芳基化。在更剧烈的条件下,在KOAc或K 2 CO 3存在下,用1对2-吡啶基苯与2-卤代吡啶以及2-和3-卤代噻吩进行二芳基化反应,以生成潜在的三齿配体tris [1,2,3- (2-吡啶基)]苯和双(2,6-硫代苯基)2-吡啶基苯。
One-pot direct C–H arylation of arenes in water catalysed by RuCl3·nH2O–NaOAc in the presence of Zn
作者:Luis A. Adrio、José Gimeno、Cristian Vicent
DOI:10.1039/c3cc43452d
日期:——
The inexpensive and commercially available catalytic system RuCl3·nH2OâNaOAcâZn is active in water for the direct CâH arylation of arenes with aryl/heteroaryl chlorides. The reaction can be accelerated by the use of microwave irradiation and can also be scaled up to a multi-gram scale with excellent isolated yields.
Ruthenium(<scp>ii</scp>)-catalyzed selective monoarylation in water and sequential functionalisations of C–H bonds
作者:Percia B. Arockiam、Cédric Fischmeister、Christian Bruneau、Pierre H. Dixneuf
DOI:10.1039/c2gc36222h
日期:——
The ruthenium(II)-phosphine catalyst RuCl2(PPh3)(p-cymene) operating water selectively leads to ortho monoarylation, with arylchlorides and heteroarylhalides, of functional arenes. Further catalytic heteroarylation with Ru(OAc)2(p-cymene) in water produces mixed bifunctional derivatives.
Diethyl carbonate as a solvent for ruthenium catalysed C–H bond functionalisation
作者:Percia Arockiam、Valentin Poirier、Cédric Fischmeister、Christian Bruneau、Pierre H. Dixneuf
DOI:10.1039/b913115a
日期:——
The ruthenium catalysed direct functionalisation of arene CâH bonds by aryl halides is reported. Reactions were performed in diethyl carbonate (DEC) instead of N-methylpyrrolidone (NMP), the solvent of choice used in most ruthenium catalysed CâH bond transformations. The use of diethyl carbonate facilitates the workup procedure thus reducing the amount of waste water. The slight loss of activity due to the use of diethyl carbonate is counterbalanced by the improvement of the catalyst efficiency achieved by a judicious choice of additives. Several arenes containing an N-heterocycle as a directing group have been diarylated.
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。