Regioselective copper-catalyzed chlorination and bromination of arenes with O2 as the oxidant
作者:Lujuan Yang、Zhan Lu、Shannon S. Stahl
DOI:10.1039/b915487f
日期:——
Electron-rich aromatic C–H bonds undergo regioselective chlorination and bromination in the presence of CuX2, LiX (X = Cl, Br) and molecular oxygen. Preliminary mechanistic insights suggest that the bromination and chlorination reactions proceed by different pathways.
A Chlorinating Reagent: N-chloro-N-methoxybenzene Sulfonamide
作者:Xiaoqiu Pu、Qingwei Li、Zehai Lu、Xianjin Yang
DOI:10.1002/ejoc.201601226
日期:2016.11
Abstract: A structurally simple and reactive chlorinatingreagent,N-chloro-N-methoxybenzenesulfonamide, was conveniently and economically prepared in high yield. 1,3-Diketones, β-keto esters, benzoyl trifluoroacetones, phenols, anisoles, heteroarenes andaromatic amines were chlorinated with it, obtaining chlorinated products in good to high yields.
Electrophilic halogenation is used to produce a wide variety of halogenated compounds. Previously reported methods have been developed mainly using a reagent‐based approach. Unfortunately, a suitable “catalytic” process for halogen transfer reactions has yet to be achieved. In this study, arylamines have been found to generate an N‐halo arylamine intermediate, which acts as a highly reactive but selective catalytic
In Situ Formed I<sup>III</sup>-Based Reagent for the Electrophilic<i>ortho</i>-Chlorination of Phenols and Phenol Ethers: The Use of PIFA-AlCl<sub>3</sub>System
作者:Pradip D. Nahide、Velayudham Ramadoss、Kevin A. Juárez-Ornelas、Yuvraj Satkar、Rafel Ortiz-Alvarado、Juan M. J. Cervera-Villanueva、Ángel J. Alonso-Castro、Juan R. Zapata-Morales、Marco A. Ramírez-Morales、Alan J. Ruiz-Padilla、Martha A. Deveze-Álvarez、César R. Solorio-Alvarado
DOI:10.1002/ejoc.201701399
日期:2018.1.31
Highly regioselective ortho‐chlorination of phenols and phenolethers can be achieved with a mixture of PhI(OTFA)2 and AlCl3 in moderate to good yields. The reproducibility of this method has also been demonstrated on gram‐scale. This new chlorinating reagent can be stored at least for two weeks at 4 °C without losing its reactivity.
An efficient chlorination of aromatic compounds using a catalytic amount of iodobenzene
作者:Ting-Ting Li、Cui Xu、Chang-Bin Xiang、Jie Yan
DOI:10.1016/j.cclet.2013.03.049
日期:2013.6
An efficient method was developed for chlorination of aromaticcompounds with electron-donating groups using iodobenzene as the catalyst and m-chloroperbenzoic acid as the terminal oxidant in the presence of 4-methylbenzenesulfonic acid in THF at room temperature for 24 h, and a series of the monochlorinated compounds was obtained in good yields. In this protocol, the catalyst iodobenzene was first