An efficient use of NiCl2·6H2O, for the cross-coupling of arylboronicacids with various N-nucleophiles, has been demonstrated. The method is practical and offers an alternative to the corresponding Cu-mediated Chan–Lam process for the construction of the C–N bond.
Electrochemically Enabled Chan–Lam Couplings of Aryl Boronic Acids and Anilines
作者:Ryan P. Wexler、Philippe Nuhant、Timothy J. Senter、Zachary J. Gale-Day
DOI:10.1021/acs.orglett.9b01434
日期:2019.6.21
The Chan–Lamreaction remains a highly utilized transformation for C–N bond formation. However, anilines remain problematic substrates due to their lower nucleophilicity. To address this problem, we developed an electrochemically mediated Chan–Lamcoupling of arylboronicacids and amines utilizing a dual copper anode/cathode system. The mild conditions identified have enabled the preparation of a
Visible-Light-Mediated Chan-Lam Coupling Reactions of Aryl Boronic Acids and Aniline Derivatives
作者:Woo-Jin Yoo、Tatsuhiro Tsukamoto、Shū Kobayashi
DOI:10.1002/anie.201500074
日期:2015.5.26
The copper(II)‐catalyzed aerobicoxidativecoupling reaction between aryl boronic acids and aniline derivatives was found to be improved significantly under visible‐light‐mediated photoredox catalysis. The substrate scope of this oxidative Chan–Lam reaction was thus expanded to include electron‐deficient aryl boronic acids as viable starting materials.
Controlled interaction of benzaldehyde thiosemicarbazones with palladium: formation of bis-complexes with cis-geometry and organopalladium complexes, and their catalytic application in C–C and C–N coupling
作者:Jayita Dutta、Samaresh Bhattacharya
DOI:10.1039/c3ra40829a
日期:——
coordinated to palladium, via dissociation of the acidic proton and activation of an ortho C–H bond, as dianionic tridentate C,N,S-donors forming two adjacent five-membered chelate rings. The [Pd(NS–R)2] and [Pd(CNS–R)(PPh3)] complexes show characteristic 1H NMR signals, and in dichloromethane solution they all display intense absorptions in the visible and ultraviolet regions. The [Pd(NS–R)2] and [Pd(CNS–R)(PPh3)]
4-R-苯甲醛硫代半碳酮(R = OCH 3,CH 3,H,Cl和NO 2)的1:1混合物与2-吡啶甲酸在相对温和的回流条件下,在乙醇介质中加入等量的Na 2 [PdCl 4 ],得到一组主要产品为[Pd(NS–R)2 ]的配合物,以及另一种类型的Pd (CNS–R)} n ]作为次要产品(其中NS–R和CNS–R分别表示N,S-和C,N,S配位的硫代半乳糖胺)。[Pd(CNS–R)} n ]络合物可以通过长时间回流下进行的类似反应方便地以高收率获得。[Pd(CNS–R)} n ]络合物中的硫桥在与三苯膦得到[Pd(CNS–R)(PPh 3)]类型的配合物。[Pd(NS-OCH 3)2 ],[Pd(NS-CH 3)2 ],[Pd(NS-Cl)2 ],[Pd(CNS-CH 3)(PPh 3)],[确定了Pd(CNS–H)(PPh 3)]和[Pd(CNS–Cl)(PPh 3)]。在[Pd(NS–R)2
A Catalyst System, Copper/N-Methoxy-1H-pyrrole-2-carboxamide, for the Synthesis of Phenothiazines in Poly(ethylene glycol)
established for the preparation of phenothiazines in good yields by two routes, starting from 2-iodoanilines and 2-bromobenzenethiol and from aryl ortho-dihalides and o-aminobenzenethiols, by conducting the reaction at 90 °C in poly(ethylene glycol)-100 (PEG-100). In addition, the catalyst system was useful for promoting direct arylation of various aryl amines, aliphatic amines, and aqueous ammonia. The simple