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-substituted pyrroles by the Paal–Knorr condensation 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.
通过Paal-Knorr缩合反应可以轻松合成N-取代的吡咯,使用简单的方法即可完成。在筛选的不同金属三氟甲磺酸酯中,在温和的反应条件下,1 mol%的Sc(OTf)3有效地促进了反应,从而获得了优异的收率(89-98%)。另外,Sc(OTf)3可以在反应后容易地回收并重复使用而没有明显的活性损失。