A Highly Efficient Heterogeneous Copper-Catalyzed Oxidative Cyclization of Benzylamines and 1,3-Dicarbonyl Compounds To Give Trisubstituted Oxazoles
作者:Li Wei、Shengyong You、Yuxin Tuo、Mingzhong Cai
DOI:10.1055/s-0037-1610710
日期:2019.8
yields. This heterogeneous copper catalyst can be facilely prepared via a simple two-step procedure from readily available and inexpensive reagents and exhibits a slightly higher activity than Cu(OAc)2. MCM-41-2N-Cu(OAc)2 is also easy to recover and can be recycled up to eight times with almost consistent activity. The reaction is the first example of heterogeneous copper-catalyzed intermolecular cyclization
抽象的 通过使用3-(2-氨基乙基氨基)丙基官能化的MCM-41固定铜(II)配合物[MCM-41-2N-Cu],实现苄胺和1,3-二羰基化合物之间铜的多相铜级联氧化环化反应(OAc)2 ]作为催化剂,t- BuOOH(TBHP)作为氧化剂,以碘为添加剂,在温和的条件下,可产生多种2,4,5-三取代的恶唑,收率大多良好至极佳。可以通过简单的两步程序轻松地从容易获得的廉价试剂制备这种多相铜催化剂,并且其活性比Cu(OAc)2略高。MCM-41-2N-Cu(OAc)2回收也很容易,可以回收八次,几乎保持一致的活性。该反应是用于构建多取代的恶唑的非均相铜催化的分子间环化的第一个实例。 通过使用3-(2-氨基乙基氨基)丙基官能化的MCM-41固定铜(II)配合物[MCM-41-2N-Cu],实现苄胺和1,3-二羰基化合物之间铜的多相铜级联氧化环化反应(OAc)2 ]作为催化剂,t- BuOOH(T