Metal ions and complexes in organic reactions. Part VII. Copper-promoted hydrogen transfer from aromatic donors to halides
作者:R. G. R. Bacon、O. J. Stewart
DOI:10.1039/j39690000301
日期:——
substitution by the reductants, and (in the case of o-bromonitrobenzene) with a small amount of Ullmann-type coupling of the halide. Copper(I) oxide or the metal were the most effective of the copper species examined, and both dissolved during reaction. Unsaturated substituents, particularly o-NO2, greatly enhanced reducibility. α-Bromo-ketones readily underwent similar reduction. Fission occurred in the
A variety of arylamines are shown to undergo oxidative C–C bond formation using quinone-based chloranil/H+ reagent as the recyclable organic (metal-free) oxidant system to afford benzidines/naphthidines. Arylamines (3°/2°) designed with various substituents were employed to understand the steric as well as electronic preferences of oxidative dimerization, and a mechanism involving amine radical cation
使用基于醌的氯腈/ H +试剂作为可循环使用的有机(无金属)氧化剂体系,可以显示出多种芳基胺进行氧化C-C键形成,以提供联苯胺/萘啶。设计了具有各种取代基的芳胺(3°/ 2°)用于理解氧化二聚作用的空间和电子偏好,并提出了涉及胺自由基阳离子的机理。通过氧化CC偶联获得的四苯基联苯胺衍生物已通过简单的化学转化进一步转化为发射蓝色光的空穴传输材料。这项研究强调了以简单,经济和有效的方式准备新型HTM。
8-<i>exo</i>
-<i>dig</i>
-Selective Cycloisomerization for the Synthesis of Dibenzo[<i>b</i>
,<i>e</i>
][1,4]diazocines Using Cationic Au<sup>I</sup>
Catalysts
作者:Mamoru Ito、Daisuke Inoue、Asahi Takaki、Kyalo Stephen Kanyiva、Takanori Shibata
DOI:10.1002/ejoc.201801037
日期:2018.9.16
The cationic AuI‐catalyzed intramolecular reaction of N‐propargyl‐2‐anilinoanilines gave a diazocine skeleton via 8‐exo‐dig‐selective cycloisomerization. Both terminal and internal alkynes could be used according to the choice of ligand of the AuI complex. Two nitrogen atoms in the tether of substrates were critical in this selective transformation.