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.
palladium-catalyzed, norbornene-mediated intermolecular dehydrogenative annulation approach for the synthesis of 6-fluoroalkyl-phenanthridines from aryl iodides and fluorinated imidoyl chlorides, which are important structural motifs for bioactive molecules, is reported. Fluorinated imidoyl chlorides served as a new type of electrophilic reagent in the Catellani-type reaction, which, in turn, could
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.
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.