An approach to the Paal–Knorr pyrroles synthesis catalyzed by Sc(OTf)3 under solvent-free conditions
作者:Jiuxi Chen、Huayue Wu、Zhiguo Zheng、Can Jin、Xingxian Zhang、Weike Su
DOI:10.1016/j.tetlet.2006.05.085
日期:2006.7
A facile synthesis of N-substitutedpyrroles by the Paal–Knorrcondensation has been accomplished using a simple procedure. Among different metal triflates screened, 1 mol % 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.