1020-54-8Relevant academic research and scientific papers
Copper-Catalyzed NaBAr 4-Based N-Arylation of Amines
Yang, Qin,Lei, Xiaoli,Yin, Zhijian,Deng, Zhihong,Peng, Yiyuan
supporting information, p. 538 - 544 (2019/01/10)
Using NaBAr 4 as an arylating agent, the formation of carbon-heteroatom bonds by a Cham-Lam cross-coupling reaction in the presence of catalytic copper(II) acetate monohydrate in acetonitrile at room temperature under air is described. The investigation of reaction scope suggests that several aliphatic and aromatic amines are compatible. In particular, the reaction of alkylamine and NaBAr 4 proceeds smoothly to offer the corresponding products in good to excellent yields.
Copper immobilized at a covalent organic framework: An efficient and recyclable heterogeneous catalyst for the Chan-Lam coupling reaction of aryl boronic acids and amines
Han, Yi,Zhang, Mo,Zhang, Ya-Qing,Zhang, Zhan-Hui
, p. 4891 - 4900 (2018/11/21)
A polyimide covalent organic framework (PI-COF) with high thermal and chemical stabilities has been readily prepared from commercially available and inexpensive reagents and was employed as an effective support for heterogeneous copper. It was demonstrated that the obtained Cu@PI-COF is a highly active heterogeneous catalyst which can effectively promote the Chan-Lam coupling reaction of aryl boronic acids and amines in an open flask without the aid of any base or additive. In addition, the catalyst could be readily recovered from the reaction mixture by simple filtration and reused for at least eight cycles without any observable change in structure and catalytic activity.
Chan-Evans-Lam Couplings with Copper Iminoarylsulfonate Complexes: Scope and Mechanism
Hardouin Duparc, Valérie,Bano, Guillaume L.,Schaper, Frank
, p. 7308 - 7325 (2018/07/05)
Copper(II) pyridyliminoarylsulfonate complexes with chloride or triflate counteranions were employed in Chan-Evans-Lam (CEL) couplings of N-nucleophiles and arylboronic acids. The complexes avoided typical side reactions in CEL couplings, and an excess of boronic acid was not required. Water was tolerated, and addition of neither base nor other additives was necessary. Primary amines, acyclic and cyclic secondary amines, anilines, aminophenol, imidazole, pyrazole, and phenyltetrazole can be quantitatively arylated at either 25 or 50 °C with 2.5 mol % of the catalyst. Reaction kinetics were investigated in detail. Kinetic and spectroscopic studies provide evidence for the formation of unproductive copper-substrate complexes. Formation of an aniline-phenylboronic acid adduct was responsible for the zero-order dependence of reaction rates on phenylboronic acid concentration. Kinetic evidence indicates that the order of reaction steps is transmetalation, nucleophile coordination, and oxidation. Couplings performed poorly with electron-deficient arylboronic acids, due to a slower Cu(II)/Cu(III) oxidation in the catalytic cycle. Photoredox catalysis partially resolved this problem, but addition of copper acetate as an external oxidant proved to be more efficient.
Solvent-free N-arylation of amines with arylboronic acids under ball milling conditions
Zhu, Xingyi,Zhang, Qihong,Su, Weike
, p. 22775 - 22778 (2014/06/23)
Solvent-free coupling reactions of arylboronic acids with various amines were presented under ball milling conditions, achieving the aromatic amine coupling products with yields ranging from moderate to good. This type of mechano-chemistry exhibited advantages of solvent-free property, high efficiency, simple work-up procedure and eco-friendliness. This journal is the Partner Organisations 2014.
Amination of aryl chlorides in water catalyzed by cyclopalladated ferrocenylimine complexes with commercially available monophosphinobiaryl ligands
Xu, Chen,Gong, Jun-Fang,Wu, Yang-Jie
, p. 1619 - 1623 (2008/01/27)
The easily accessible, air- and moisture-stable cyclopalladated ferrocenylimine complex 3 was found to be a highly active one-component precatalyst for the amination of aryl chlorides in water in the presence of inexpensive KOH and t-BuOH as a base and an additive, respectively.
Condensations of 1,4-Cyclohexanediones and Secondary Aromatic Amines. II. N-Phenylation of Diarylamines
Haga, Kazuo,Iwaya, Katsumasa,Kaneko, Ryohei
, p. 803 - 808 (2007/10/02)
The condensations of 1,4-cyclohexanedione with several diphenylamines were investigated in order to determine the limit of the utility of this reaction for the N-phenylation of aromatic secondary amines. 4-Methoxy-, 4,4'-dimethyl-, and 4,4'-dibromodiphenylamines produced their N-phenylated compounds in fairly good yields, but 4-hydroxy-, 3-methoxy-, and 4,4'-bis(dimethylamino)diphenylamines produced poor yields.Nitro-substituted diphenylamines gave N-phenyl derivatives in low yields along with N-4-hydroxyphenyl derivatives.N,N'-Diphenyl-p-phenylenediamine and N,N'-diphenylbenzidine gave correspondig tetra-N-phenyl diamines in good yields.The condensation of N-phenyl-1-naphthylamine, N-phenyl-2-naphthylamine, di-2-pyridylamine, phenothiazine, and carbazole with 1,4-cyclohexanedione were also examined.
Diphenylamino and indolyl substituted pyromellitides
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, (2008/06/13)
This invention relates to 3,7-bis(disubstituted aminophenyl- or indolyl)-3,7-bis(diphenylamino)pyromellitides, 3,5-bis(disubstituted aminophenyl- or indolyl)-3,5-bis(diphenylamino)pyromellitides and mixtures thereof useful as color formers, particularly in carbonless duplicating and thermal marking systems, which are prepared by the interaction of 2,5-bis(disubstituted aminophenyl- or indolyl)carbonyl-1,4-benzenedicarboxylic acids or 2,4-bis(disubstituted aminophenyl- or indolyl)carbonyl-1,5-benzenedicarboxylic acids and mixtures thereof with diphenylamines.
