Iron-Catalyzed Cyclotrimerization of Terminal Alkynes by Dual Catalyst Activation in the Absence of Reductants
作者:Davide Brenna、Matteo Villa、Tim N. Gieshoff、Fabian Fischer、Marko Hapke、Axel Jacobi von Wangelin
DOI:10.1002/anie.201705087
日期:2017.7.10
metals under mild conditions is at the heart of sustainable synthesis. The cyclotrimerization of alkynes is a valuable atom‐efficient reaction in organic synthesis that is enabled by several metal catalysts, including iron. This study reports an effective iron‐catalyzed cyclotrimerization for the regioselective synthesis of 1,2,4‐substituted arenes (1 mol % catalyst, toluene, 20 °C, 5 min). A dual activation
在温和条件下催化与富含地球的金属进行C-C键形成反应是可持续合成的核心。炔烃的环三聚是有机合成中有价值的原子效率反应,这种反应可通过多种金属催化剂(包括铁)来实现。这项研究报告了一种有效的铁催化的环三聚反应,可用于区域选择性合成1,2,4-取代的芳烃(1 mol%催化剂,甲苯,20°C,5分钟)。双重激活机制(底物去质子化,还原消除)使简单的Fe II预催化剂在没有任何还原剂的情况下具有很高的活性。