Gold(I)‐Catalyzed and PTSA‐Promoted Cycloisomerization of Ynamides to Access Pyrrole Substituted α,β‐Unsaturated Ketones**

Abstract

AbstractSubstituted pyrroles are prevalent aromatic ring systems encountered in numerous natural products and bioactive molecules. Herein, a novel ynamide scaffold has been designed, synthesized and subsequently applied to an unprecedented gold‐catalyzed and para‐toluenesulfonic acid (PTSA)‐assisted cascade cycloisomerization reaction for the synthesis of β‐pyrrole substituted α,β‐unsaturated ketones. Notably, the reaction is stereoselective, offering E‐isomer as major product with low to moderate yield.