5465-85-0Relevant academic research and scientific papers
Mechanistic Insights into the FeCl3-Catalyzed Oxidative Cross-Coupling of Phenols with 2-Aminonaphthalenes
Vershinin, Vlada,Forkosh, Hagit,Ben-Lulu, Mor,Libman, Anna,Pappo, Doron
, p. 79 - 90 (2020/12/23)
The selective FeCl3-catalyzed oxidative cross-coupling reaction between phenols and primary, secondary, and tertiary 2-aminonaphthalene derivatives was investigated. The generality of this scalable method provides a sustainable alternative for preparing N,O-biaryl compounds that are widely used as ligands and catalysts. Based on a comprehensive kinetic investigation, a catalytic cycle involving a ternary complex that binds to both the coupling partners and the oxidant during the key oxidative coupling step is postulated. Furthermore, the studies showed that the reaction is regulated by off-cycle acid-base and ligand exchange processes.
I2/NaH2PO2-mediated deoxyamination of cyclic ethers for the synthesis of: N -aryl-substituted azacycles
Chen, Tieqiao,Huang, Tianzeng,Li, Chunya,Li, Dongyang,Lin, Ying,Liu, Long,Tang, Zhi,Zhang, Jingjing
supporting information, p. 21011 - 21014 (2021/12/04)
We have developed a protocol for efficient synthesis of N-aryl-substituted azacycles from aryl amines and cyclic ethers using I2/NaH2PO2 as the mediator. A diverse range of aryl amines and cyclic ethers undergo amination reaction to generate products in good to excellent yields with good functional group tolerance. This reaction can be easily scaled up to give N-aryl-substituted azacycles on a gram scale. Further chemical manipulation of the products enabled useful transformations of the quinoline ring, including bromination and acetylation. This journal is
Visible-light-mediated borylation of aryl and alkyl halides with a palladium complex
Zhao, Jia-Hui,Zhou, Zhao-Zhao,Zhang, Yue,Su, Xuan,Chen, Xi-Meng,Liang, Yong-Min
, p. 4390 - 4394 (2020/10/20)
Palladium catalyzed visible-light-mediated borylation of inactivated aryl and alkyl halides is reported; the method provided high yields and excellent functional group compatibility. Furthermore, arylsilicates were synthesized selectively using dimethylphenylsilyl boronic ester via changing the reaction conditions. Finally, the possible reaction mechanism is determined through fluorescence quenching and turn on/off experiments.
Redox-Neutral β-C(sp3)-H Functionalization of Cyclic Amines via Intermolecular Hydride Transfer
Zhou, Lan,Shen, Yao-Bin,An, Xiao-De,Li, Xian-Jiang,Li, Shuai-Shuai,Liu, Qing,Xiao, Jian
supporting information, p. 8543 - 8547 (2019/11/03)
Herein, we report the first redox-neutral and transition-metal-free β-C(sp3)-H functionalization of cyclic amines via a consecutive intermolecular hydride transfer process. A series of N-aryl pyrrolidines and N-aryl 1,2,3,4-tetrahydropyridines decorated with CF3 and carboxylic ester functionalities are directly accessed in good yields from pyrrolidines and piperidines. This work pushes forward the application of the intermolecular hydride transfer strategy in one-step assembly of molecular complexity.
Redox-neutral: Ortho -C-H amination of pinacol arylborates via palladium(ii)/norbornene catalysis for aniline synthesis
Chen, Shuqing,Wang, Peng,Cheng, Hong-Gang,Yang, Chihui,Zhou, Qianghui
, p. 8384 - 8389 (2019/09/30)
A palladium(ii)/norbornene cooperative catalysis enabled redox-neutral ortho-C-H amination of pinacol aryl- or heteroarylborates for the synthesis of structurally diverse anilines is reported. This method is scalable, robust (tolerance of air and moisture), phosphine ligand-free, and compatible with a wide range of functionalities. These practical features make this reaction amenable for industry. A plethora of synthetically very useful halogenated anilines, which often cannot be prepared via other transition-metal-catalyzed aminations, are readily produced using this method. Particularly, the orthogonal reactivity between pinacol arylborates and aryl iodides is demonstrated. Preliminary deuterium-labeling studies reveal a redox-neutral ipso-protonation mechanism of this process, which will surely inspire the future development of this field. Overall, the exceptionally broad scope (47 examples) and reliability of this procedure, together with the wide availability of pinacol arylborates, make this chemistry a valuable addition to the existing methods for aniline synthesis.
Aromatic amine compound, EphB4 kinase inhibitor and its derivatives, and preparation methods thereof
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Paragraph 0140-0142, (2019/11/04)
The invention provides an aromatic amine compound, an EphB4 kinase inhibitor and its derivatives, and preparation methods thereof. Aryl boronic acid or aryl boronate and O-benzoyl hydroxylamine compounds which are used as starting raw materials are stirred and reacted in an organic solvent at 30-100 DEG C in an air atmosphere under the action of a palladium catalyst, a norbornene derivative and analkali, and separation and purification are carried out after the reaction in order to obtain the aromatic amine compound. The method has the advantages of inexpensive and readily available raw materials, no halide ion residual after the completion of the reaction, and mild reaction conditions. The invention also provides the method for synthesizing the EphB4 kinase inhibitor and its derivatives.The EphB4 kinase inhibitor and its derivatives can be synthesized from the synthesized 3,5-diminated halogenobenzene or halogenoid benzene only through a simple step.
Nucleophilic Amination of Methoxy Arenes Promoted by a Sodium Hydride/Iodide Composite
Kaga, Atsushi,Hayashi, Hirohito,Hakamata, Hiroyuki,Oi, Miku,Uchiyama, Masanobu,Takita, Ryo,Chiba, Shunsuke
supporting information, p. 11807 - 11811 (2017/09/20)
A method for the nucleophilic amination of methoxy arenes was established by using sodium hydride (NaH) in the presence of lithium iodide (LiI). This method offers an efficient route to benzannulated nitrogen heterocycles. Mechanistic studies showed that the reaction proceeds through an unusual concerted nucleophilic aromatic substitution.
n-Butyllithium-mediated synthesis of N-aryl tertiary amines by reactions of fluoroarenes with secondary amines at room temperature
Lin, Yingyin,Li, Meng,Ji, Xinfei,Wu, Jingjing,Cao, Song
, p. 1466 - 1472 (2017/02/18)
A simple and facile method for the synthesis of aromatic tertiary amines by amination of fluoroarenes with secondary amines in the presence of n-butyllithium at room temperature was reported.
New, potentially chelating NHC ligands; synthesis, complexation studies, and preliminary catalytic evaluation
Ou, Arnold,Wu, Linglin,Salvador, Alvaro,Sipos, Gellert,Zhao, Guangzhen,Skelton, Brian W.,Sobolev, Alexandre N.,Dorta, Reto
supporting information, p. 3631 - 3641 (2017/03/22)
Two new N-heterocyclic carbene (NHC) ligands bearing 2-morpholino and 2-piperidinyl naphthyl wingtips were synthesised (2-SIMorNap and 2-SIPipNap). Nuclear magnetic resonance studies, in conjunction with crystal structures and derivatisation of the NHC salts using a chiral counteranion, revealed that the ligand wingtips are oriented anti with respect to each other. From the free carbene, palladium, ruthenium and iridium complexes were prepared. NHC-iridium dicarbonyl complexes were made in order to extract the TEP values for these ligands. The study showed that these NHC ligands are more electron-donating than normal, aryl-substituted NHCs. The palladium complexes were tested in representative Suzuki-Miyaura cross-coupling reactions and compared to the state of the art systems. Ruthenium-catalysed ring-closing metathesis with these ligands was also performed. It was found that Grubbs’ 2nd generation catalyst incorporating 2-SIPipNap did not initiate at room temperature and required heating for RCM to occur.
Heterogeneous Rhodium-Catalyzed Aerobic Oxidative Dehydrogenative Cross-Coupling: Nonsymmetrical Biaryl Amines
Matsumoto, Kenji,Yoshida, Masahiro,Shindo, Mitsuru
supporting information, p. 5272 - 5276 (2016/04/26)
The first heterogeneously catalyzed oxidative dehydrogenative cross-coupling of aryl amines is reported herein. 2-Naphthylamine analogues were reacted with various electron-rich arenes using a heterogeneous Rh/C catalyst under mild aerobic conditions, thus affording nonsymmetrical biaryl amines in excellent yields with high selectivities. This reaction provides a mild, operationally simple, and efficient approach for the synthesis of biaryls which are important to pharmaceutical and materials chemistry. A jab-cross move: A heterogeneously catalyzed oxidative dehydrogenative cross-coupling of aryl amines is reported. Aryl amines were treated with various arenes using a heterogeneous Rh/C catalyst under mild aerobic conditions to selectively afford cross-coupled products, and provides an efficient synthetic method for the preparation of nonsymmetrical biaryl amines by oxidative C-H activation.
