Cationic Gold‐Catalyzed Intramolecular Cyclization of Substituted 1,5‐Diynes to Access Indenone Derivatives.

An efficient intramolecular cyclization reaction was developed to achieve indenone derivatives. The substituted 1,5‐diyenes were converted to the corresponding indenones via a gold‐catalyzed organic transformation, and moderate to excellent yields of the title molecules were obtained via formation of two C=O and one C−C bonds under mild reaction conditions in one pot. [ABSTRACT FROM AUTHOR]