Substituent Electronic Effects Govern Direct Intramolecular C–N Cyclization of <i>N</i>-(Biphenyl)pyridin-2-amines Induced by Hypervalent Iodine(III) Reagents
The hypervalent iodine(III) reagent-induced the direct intramolecular C–N cyclization of N-(biphenyl)pyridin-2-amines to 6-arylbenzimidazoles and N-pyridinyl-9H-carbazoles is presented. The substituent electronic effects governing the formation of benzimidazoles and carbazoles from the reaction of N-(biphenyl)pyridin-2-amines with hypervalent iodine(III) reagents is investigated. Radical trapping and