Base‐Promoted Synthesis of Indenones from Cyclopropenone via N‐atom Nucleophilicity on Imidazole or Amide

A base‐promoted domino reaction strategy has been developed for the synthesis of 3‐substituted 2‐phenylindenones through the nucleophilic ring‐opening of 2,3‐diphenylcyclopropenone by nitrogen atoms. This protocol encompasses a series of reactions, including Michael addition, ring‐opening, intramolecular Friedel–Crafts cyclization, and dehydrogenation, offering a transition‐metal‐free pathway to efficiently access indenone scaffolds.