6-Aroylated Phenanthridines via Base Promoted Homolytic Aromatic Substitution (BHAS)
作者:Dirk Leifert、Constantin Gabriel Daniliuc、Armido Studer
DOI:10.1021/ol403147v
日期:2013.12.20
2-isocyanobiphenyls react with aromatic aldehydes via base promoted homolytic aromatic substitution (BHAS) to give 6-aroylated phenanthridines. Reactions occur via addition of acylradicals to the isonitrile functionality and subsequent intramolecular BHAS of the intermediate imidoyl radicals. Initiation of the radicalchainreaction is best achieved with small amounts of FeCl3 (0.4 mol %), and the commercially
A novel and convenient cascade trifluoroethylation/cyclization of organic isoselenocyanates by phenyl(2,2,2-trifluoroethyl)iodonium triflate is reported. A series of 2-isoselenocyanobiaryls and aryl alkyl isoselenocyanates reacted with phenyl(2,2,2-trifluoroethyl)iodonium triflate in CH2Cl2 at 40 °C under metal- and additive-free conditions for 3 h to provide the corresponding trifluoroethylselenolated
PhI(OAc)<sub>2</sub>-Mediated Synthesis of 6-(Trifluoromethyl)phenanthridines by Oxidative Cyclization of 2-Isocyanobiphenyls with CF<sub>3</sub>SiMe<sub>3</sub> under Metal-Free Conditions
作者:Qile Wang、Xichang Dong、Tiebo Xiao、Lei Zhou
DOI:10.1021/ol4022589
日期:2013.9.20
A mild and efficient method for the synthesis of 6-(trifluoromethyl)phenanthridines through oxidativecyclization of 2-isocyanobiphenyls with CF3SiMe3 under metal-free conditions was developed. The reaction allows the direct formation of C–CF3 bonds and rapid access to phenanthridine ring systems in one catalytic cycle.
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
N-heterocyclic carbene (NHC)-catalyzed tandem cyclization/addition/cyclization reaction of 2-isocyanobiaryls and α-bromo-N-cinnamylamides for the synthesis of 2-pyrrolidinone-functionalized phenanthridines is developed. This protocol features a radical cascade process, broad substrate scope, and good functional group compatibility under metal- and oxidant-free reaction conditions.