Chemoselective Aza-[4+3]-annulation of N-Perfluoroalkyl-1,2,3-triazoles with 1,3-Dienes: Access to N-Perfluoroalkyl-Substituted Azepines.

Rhodium-catalyzed transannulation of N-perfluoroalkylated 1,2,3-triazoles with 1,3-dienes under microwave heating proceeded chemoselectively via the formal aza-[4+3]-pathway, affording N-perfluoroalkyl-substituted 2,5-dihydroazepines. A unique regioselectivity profile was observed in annulation with 1-substituted 1,3-diene, affording unusual 5,6-disubstituted examples. Transannulation of triazoles with 2-trimethylsilyloxybutadiene provided N-perfluoroalkyl-substituted azepinone derivatives.