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。
Silver-Catalyzed Tandem Trifluoromethylation and Cyclization of Aryl Isonitriles with the Langlois Reagent
作者:Xing-Guo Zhang、Yu-Rong Liu、Hai-Yong Tu
DOI:10.1055/s-0034-1378810
日期:——
A mild and efficient procedure for the silver-catalyzed tandem trifluoromethylation and cyclization of aryl isonitriles with the Langlois reagent (sodium triflinate) is developed. A series of trifluoro-methylated phenanthridines is prepared in moderate to good yields from a cheap and stable trifluoromethyl source.
Palladium-catalyzed intramolecular C−H bond functionalization of trifluoroacetimidoyl chloride derivatives: Synthesis of 6-trifluoromethyl-phenanthridines
作者:Mei Zhu、Weijun Fu、Guanglong Zou、Chen Xu、Zhiqiang Wang
DOI:10.1016/j.jfluchem.2014.04.005
日期:2014.7
Highly efficient approaches to obtain 6-trifluoromethyl-phenanthridine derivatives have been realized through the palladium-catalyzed intramolecular C-H bond functionalization of trifluoroacetimidoyl chlorides. The reaction allows the direct formation of C-sp2-C-sp2 bonds via C-H bond functionalization and rapid access to phenanthridine ring systems in moderate to high yields with good functional group tolerance. (C) 2014 Elsevier B.V. All rights reserved.