Copper-catalyzed [3+2] annulation of N-chlorocyclopropylamides with alkenes to cyclopentenes.

We report a copper-catalyzed intermolecular [3+2] cycloaddition of N-chloro-N-cyclopropylbenzamides with electron-deficient olefins, enabling efficient synthesis of functionalized cyclopentenes via a nitrogen-centered radical pathway. This method features broad substrate scope, excellent functional-group tolerance, scalability, and synthetic utility, providing an atom-economical route to valuable cyclopentene scaffolds.