Electrochemical synthesis of benzo-fused aza heterocycles via C(sp3)-H bond functionalisation/cyclisation.

We report a sustainable electrochemical approach for the direct C(sp3)-H functionalization of alicyclic amines through intramolecular coupling with a malonate partner. This oxidant-free protocol enables efficient access to structurally diverse five- to nine-membered azacyclic ring-fused tetrahydroquinoline and benzoazepine dicarboxylates under environmentally benign conditions. The methodology features broad substrate scope, excellent functional-group tolerance, and operational simplicity, while avoiding the use of stoichiometric external oxidants. Overall, this work offers a practical and green alternative to conventional hydride-shift-based strategies for the synthesis of valuable tetrahydroquinoline and benzoazepine dicarboxylates.