A 2,2′-bipyridine-palladacycle catalyzed the coupling of arylboronic acids with nitroarenes
摘要:
A novel palladium-catalyzed protocol for the synthesis of diaryl ethers derivatives has been developed. In the presence of 2,2'-bipyridine-cyclopalladated ferrocenylimine complex (Cat. Ic), diary] ethers were selectively generated by adjusting reaction parameters through the coupling of arylboronic acids and nitroarenes with yields ranging from poor to good. The efficiency of this reaction was demonstrated by its compatibility with a range of groups. Moreover, the rigorous exclusion of air or moisture was not required in these transformations. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
Synthesis of Diaryl Ethers, Diaryl Sulfides, Heteroaryl Ethers and Heteroaryl Sulfides under Microwave Dielectric Heating
作者:Quanrui Wang、Feng Li、Qingqing Meng、Huansheng Chen、Zhiming Li、Fenggang Tao
DOI:10.1055/s-2005-865321
日期:——
This paper describes the synthesis of diaryl ethers and sulfides by utilizing microwave heating methodology. The methodology is shown to be rapid and efficient for the coupling of phenols or thiophenol with electron-deficient aryl halides through a SNAr reaction. The scope of the protocol can be expanded to six-membered heterocycles bearing a hydroxyl group as well as to the reaction of 2-pyrimidinethiol with mildly activated aryl halides, providing heteroaryl ethers and sulfides, respectively. The advantages of the present method include the wide substrate scope, the obviation of metal catalysts, ease of product isolation, and high purity of products.
Electrochemical Reductive Smiles Rearrangement for C–N Bond Formation
作者:Xihao Chang、Qinglin Zhang、Chang Guo
DOI:10.1021/acs.orglett.8b03178
日期:2019.1.4
A conceptually new and synthetically valuable radical Smiles rearrangement reaction is reported under undivided electrolytic conditions. This protocol employs an entirely new strategy for the electrochemical radical Smiles rearrangement. Remarkably, an amidyl radical generated from the cleavage of the N–O bond under reductive electrolytic conditions plays a crucial role in this transformation. Various
A Facile Approach to 4,5-Dihydro[1,2,4]triazolo[3,2-<i>d</i>][1,5]benzoxazepines
作者:Quanrui Wang、Qingqing Meng、Hexiang Bai、Zhiming Li、Fenggang Tao
DOI:10.1055/s-2007-966059
日期:2007.6
The novel tricyclic heterocycles of 4,5-dihydro[1,2,4]triazolo[3,2- D][1,5]benzoxazepine derivatives were prepared by the cycloaddition of the corresponding bicyclic cationic 1,3-dipoles, which were easily generated from the azoacetates by reaction with AlCl 3 as a Lewis acid, to the triple bond of nitriles along with the consecutive ring expansion. The formation of products deviating from the normal
Uranyl-Photocatalyzed Hydrolysis of Diaryl Ethers at Ambient Environment for the Directional Degradation of 4-O-5 Lignin
作者:Yilin Zhou、Deqing Hu、Daoji Li、Xuefeng Jiang
DOI:10.1021/jacsau.1c00168
日期:2021.8.23
to achieve two types of phenols at room temperature under normal pressure. The single electron transfer process was disclosed by a radical quenching experiment and Stern–Volmer analysis between diphenyl ether and uranyl cation catalyst, followed by oxygen atom transfer process between radical cation of diphenyl ether and uranyl peroxide species. The 18O-labeling experiment precisely demonstrates that