A New Pyrrole Synthesis via Silver(I)-Catalyzed Cycloaddition of Vinylogous Diazoester and Nitrile

A new synthesis of di- and trisubstituted pyrroles was achieved by treating in situ generated vinylogous diazoesters and readily available nitriles with a catalytic amount of silver(I) antimony hexafluoride at room temperature. This method showcased the potential of utilizing silver(I) carbenoids in preparing heterocyclic compounds.