A mechanistically new strategy has been described for the simple, practical, and environmentally friendly preparation of 6-(trifluoromethyl)phenanthridine derivatives using ionic isocyanide insertion from biphenyl isocyanide derivatives and Umemoto’s reagent. These reactions were promoted only by inorganic base in good-to-excellent chemical yields without any external stoichiometric oxidants and radical
A palladium-catalyzed tandem Suzuki/C–H arylation reaction of N-aryltrifluoroacetimidoyl chlorides with arylboronic acids has been developed. A variety of 6-(trifluoromethyl)phenanthridines were prepared in moderate to excellent yields from N-(2-bromophenyl)trifluoroacetimidoyl chlorides which can be conveniently prepared from 2-bromoaniline derivatives.
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.