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
Synthesis of 6-Trifluoromethylphenanthridines through Radical Trifluoromethylation of Isocyanides with Sodium Triflinate under Visible Light
作者:Jianbin Li、Clarice A. D. Caiuby、Márcio W. Paixão、Chao-Jun Li
DOI:10.1002/ejoc.201701487
日期:2018.6.7
Trifluoromethylation enabled by photochemistry enriched the toolbox of synthetic chemists, to allow the simple and efficient installation of CF3 groups in organic molecules. Herein, we report a cascade addition/annulation reaction of 2‐isocyanobiphenyls towards the synthesis of 6‐trifluoromethylphenanthridines. It is proposed that this reaction is triggered by the CF3 radical generated from photoexcited
A photocatalyst-free, light promoted sequential radical addition/annulation of 2-isocyanobiphenyls to 6-trifluoromethyl phenanthridines with high efficiency is presented.
An approach to 6-trifluoromethyl-phenanthridines through visible-light-mediated intramolecular radical cyclization of trifluoroacetimidoyl chlorides
作者:Weijun Fu、Mei Zhu、Fengjuan Xu、Yuqin Fu、Chen Xu、Dapeng Zou
DOI:10.1039/c4ra02384f
日期:——
A mild and efficient visible light-mediated intramolecular radical cyclization of trifluoroacetimidoyl chlorides is developed for the synthesis of 6-(trifluoromethyl)phenanthridine derivatives. The reaction involves the generation of radical intermediates from C(sp2)–Cl bonds and a homolytic radical aromatic substitution (HAS) process.
employing sodium trifluoromethanesulfinate (CF3SO2Na) as the trifluoromethyl source. The method enabled the syntheses of a series of 6-(trifluoromethyl)phenanthridine derivatives in moderate to high yields under metal- and oxidant-free conditions. A gram-scale synthesis highlights the synthetic versatility of the reported protocol.
使用三氟甲亚磺酸钠 (CF 3 SO 2 Na) 作为三氟甲基源,通过恒流电解开发了 2-异氰基联芳基的有效三氟甲基化。该方法能够在无金属和无氧化剂的条件下以中等到高产率合成一系列 6-(三氟甲基) 菲啶衍生物。克级合成突出了所报告协议的合成多功能性。