Fig. 1: Sequential electrochemical synthesis of aza-oxa-dehydro[7]helicenes (this work).
From: Electrochemical synthesis of heterodehydro[7]helicenes

Two methods for synthesizing dehydro[7]helicenes 3: (A) electrochemical sequential synthesis through the oxidative hetero-coupling of 1 and 2 followed by dehydrative cyclization and intramolecular C-C bond formation; (B) stepwise enantioselective synthesis through chiral vanadium-catalyzed hetero-coupling and electrochemical oxidative transformations.