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
Copper powder-catalyzed N-arylation of imidazoles in water using 2-(hydrazinecarbonyl)pyridine N-oxides as the new ligands
作者:Feng-Tian Wu、Nan-Nan Yan、Ping Liu、Jian-Wei Xie、Yan Liu、Bin Dai
DOI:10.1016/j.tetlet.2014.04.039
日期:2014.5
2-(2-Hydrazinecarbonyl)pyridine N-oxides, which were derived from pyrrole-2-carbohydrazides and pyridine N-oxides, were synthesized and utilized as the ligands for copper powder-catalyzed N-arylation of imidazoles with aryl halides in water. Imidazoles could be arylated smoothly with various aryl halides to provide the title products in preferable yields without the need of an inert atmosphere.
prepared and anchored with copper salts for use as the catalyst for the Ullmann C–X couplingreaction. The Schiff-basic chitosan supported coppercomplex (PCCS@CuI) exhibits the highest catalytic activity. The structure of the catalyst was characterized by FTIR spectroscopy, TG, XRD, SEM, EDS and XPS. This catalyst exhibited high applicability for the C–N and C–S couplingreactions, in which good to excellent
A bi-functional sugar-based surfactant ALA14 was designed as the ligand and micelle constructor and demonstrated to promote the copper-catalyzed C–X coupling reaction in water. The nature of this micelle, formed by sugar-based surfactants, was investigated with CMC, DLS, and TEM, by which encapsulation and aggregation of the substrates in micelles were verified. Additionally, it was addressed by 1H-NMR