A facile synthesis of N-substituted pyrroles by the Paal–Knorr condensation has been accomplished using a simple procedure. Among different metal triflates screened, 1mol% Sc (OTf) 3 efficiently promoted the reaction to give excellent yield (89–98%) under mild reaction conditions. Additionally, Sc (OTf) 3 could be recovered easily after the reactions and reused without evident loss in activity.
