Unique copper–salen complex: an efficient catalyst for N-arylations of anilines and imidazoles at room temperature
作者:Ankur Gogoi、Gayatri Sarmah、Anindita Dewan、Utpal Bora
DOI:10.1016/j.tetlet.2013.10.084
日期:2014.1
activity of a unique Cu–salen type complex in N-arylation of anilines with arylboronic acids in water. The protocol is found to be applicable for a wide range of electronically diversified arylboronic acids and anilines with excellent yields of the isolated product. Further the scope of this protocol has been extended to the synthesis of various N-aryl imidazoles in iso-propanol.
Carbothioamide as Highly Efficient Ligand for Copper-catalyzed Room Temperature Chan-Lam Cross-Coupling Reaction
作者:Jayantajit Baruah、Kongkona Gogoi、Anindita Dewan、Geetika Borah、Utpal Bora
DOI:10.1002/bkcs.11248
日期:2017.10
The catalytic activity of three N,S‐donor ligands, viz L1 [2‐(4‐methoxybenzylidene)‐N‐phenylhydrazinecarbothioamide], L2 [2,2′‐(1,2‐diphenylethane‐1,2‐diylidene)bis(hydrazinecarbothioamide)] and L3 [2‐(4‐methoxybenzylidene)hydrazinecarbothioamide] has been reported for N‐arylation of imidazoles with arylboronicacids in ethanol at room temperature. The method was found to be applicable in N‐arylation
<i>N</i>,<i>O</i>-Bidentate ligand-tunable copper(<scp>ii</scp>) complexes as a catalyst for Chan–Lam coupling reactions of arylboronic acids with 1<i>H</i>-imidazole derivatives
作者:Xuefeng Jia、Pai Peng
DOI:10.1039/c8ob02254b
日期:——
An efficient procedure for Chan–Lam coupling reactions of arylboronic acids with 1H-imidazole derivatives using N,O-bidentate ligand-tunable copper(II) complexes as a catalyst under base-free conditions has been developed. This protocol features mild reaction conditions, high yields and compatibility with different functional groups, providing a direct and facile strategy for the construction of C–N
Copper-Catalyzed N-Arylation of Imidazoles and Benzimidazoles
作者:Ryan A. Altman、Erica D. Koval、Stephen L. Buchwald
DOI:10.1021/jo070807a
日期:2007.8.1
10-phenanthroline (L1c) was found to be an efficientligand for the copper-catalyzed N-arylation of imidazoles and benzimidazoles with both aryl iodides and bromides under mild conditions. Further optimization of the system has revealed that the addition of poly(ethylene glycol) accelerates this reaction. A variety of hindered and functionalized imidazoles, benzimidazoles, and aryl halides were transformed in good
A series of cationic π-extended imidazolium salts were synthesized by a sequential Cu-catalyzed arylation/annulation and photocyclization strategy in a simple but efficient way. Among them, a nine-fused-ring compound with a doubly aza[5]helical geometry is by far the largest cationic polycyclic heteroaromatic with a central imidazolium core.