Transition-metal-free, visible-light induced cyclization of arylsulfonyl chlorides with 2-isocyanobiphenyls to produce phenanthridines
作者:Lijun Gu、Cheng Jin、Jiyan Liu、Hongyan Ding、Baomin Fan
DOI:10.1039/c4cc01487a
日期:——
A visible-light promoted transformation of 2-isocyanobiphenyls and arylsulfonyl chlorides for the synthesis of phenanthridines under oxidant-free and transition-metal-free conditions was described.
Visible-light-induced tandem radical addition–cyclization of 2-aryl phenyl isocyanides catalysed by recyclable covalent organic frameworks
作者:Shuyang Liu、Wenna Pan、Songxiao Wu、Xiubin Bu、Shigang Xin、Jipan Yu、Hao Xu、Xiaobo Yang
DOI:10.1039/c9gc00022d
日期:——
A visible-light-induced tandemradicaladdition–cyclization sequence via 2-aryl phenyl isocyanides as the starting material and two-dimensional covalent organic frameworks (2D-COFs) as the photocatalyst was developed, delivering multifarious 6-substituted phenanthridines in high yields. Benefitting from the utilization of a heterogeneous photocatalyst, this protocol features easy catalyst separation
Preparation of Substituted Phenanthridines from the Coupling of Aryldiazonium Salts with Nitriles: A Metal Free Approach
作者:Mani Ramanathan、Shiuh-Tzung Liu
DOI:10.1021/acs.joc.5b00579
日期:2015.5.15
A transition metal free approach for the synthesis of substituted phenanthridines from the coupling reaction of aryldiazonium tetrafluoroborates with nitriles has been developed. This operationally simple protocol proceeds through a substitution of aryldiazonium with nitriles followed by an intramolecular arylation to provide the corresponding phenanthridines in moderate to excellent yields.
A study of the gas-phase interconversion of 1-(2-aryloxyphenyl)alkaniminyl and 2-(aryliminomethyl)phenoxyl radicals
作者:Michael Black、J. I. G. Cadogan、Rino Leardini、Hamish McNab、Graham McDougald、Daniele Nanni、David Reed、Alberto Zompatori
DOI:10.1039/a800884a
日期:——
Flashvacuumpyrolysis of the allylethers 9–11 and of the oxime ethers 15–17 at 650 °C (5 × 10–2–5 × 10–3 Torr) generates 2-(aryliminomethyl)phenoxyl radicals 4 and 1-(2-aryloxyphenyl)alkaniminyl radicals 5 respectively which can interconvert via a spirodienyl radical leading to common products which are generally isolated in low to moderate yield. The iminyls 5 normally undergo β-cleavage leading
Catalyst free synthesis of 6-aryl phenanthridines and amides through an electrochemicalreaction is reported in this study. The couplingreaction proceeds by the cathodic reduction of in situ formed diazonium ions, which are formed from anilines and an alkyl nitrite. The generated aryl radical diazonium ions coupled from isocyanides furnished the desired products in good yields. This cascade reaction was
该研究报道了通过电化学反应无催化剂合成6-芳基菲啶和酰胺。通过阴极还原由苯胺和亚硝酸烷基酯形成的原位形成的重氮离子进行偶联反应。由异氰酸酯偶联生成的芳基自由基重氮鎓离子以良好的收率提供了所需的产物。该级联反应在室温下以n Bu 4 NBF 4作为电解质在配备有RVC作为阳极且Pt作为阴极的不分隔电池中进行。还进行了一系列详细的机理研究,包括自由基时钟实验和循环伏安法分析。