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Transition-metal-free, visible-light-mediated regioselective C–H trifluoromethylation of imidazo[1,2-a]pyridines
- Zhou, Qiguang, Xu, Song, Zhang, Ronghua
- Tetrahedron letters 2019 v.60 no.10 pp. 734-738
- carboxylic acids, chemical reactions, chemical structure, pyridines, regioselectivity
- A transition-metal-free, visible-light-induced trifluoromethylation of imidazo[1,2-a]pyridines has been developed at mild conditions by employing cheap and commercially available anthraquinone-2-carboxylic acid (AQN-2-CO2H) as the photo-organocatalyst, and Langlois reagent as the trifluoromethylating reagent. A series of 3-(trifluoromethyl)imidazo[1,2-a]pyridine derivatives with broad functionalities could be conveniently and efficiently obtained by direct regioselective functionalization.