Divergent Synthesis of Fused Tricyclic Compounds via a Tandem Reaction from Alkynyl-cyclohexadienones and Diazoesters.

A distinct one-pot protocol toward several types of fused tricyclic scaffolds has been developed, by employing diazoesters and alkynyl-cyclohexadienones as starting materials, enabling rapid construction of diverse tricyclic compounds with multiple bonds formation in an operationally simple procedure. Typically, this controlled tandem sequence showcases the in situ formation of tetrasubstituted allenoates, an unprecedented anion-triggered annulation, and oxidative aromatization.