One-Step Synthesis of 1,2,5-Trisubstituted Pyrroles by Copper Catalyzed Condensation of 1,4-Diones with Primary Amines

Highly dispersed copper iodide on activated carbon (CuI/C) solid catalyst has been investigated for the Paal–Knorr condensation of γ-diketones with aliphatic, aromatic and heterocyclic amines under solvent-free conditions; which lead to the formation of N- substituted pyrrole derivatives in excellent yields. This simple experimental procedure combined with easy recovery and reusability of the catalyst is expected to contribute to the progression of a clean and ecofriendly strategy for the synthesis of N-substituted pyrrole derivatives.