Pd-Tetrahydrosalan-Type Complexes as Catalysts for Sonogashira Couplings in Water: Efficient Greening of the Procedure
作者:Krisztina Voronova、Levente Homolya、Antal Udvardy、Attila C. Bényei、Ferenc Joó
DOI:10.1002/cssc.201402147
日期:2014.8
diphenylacetylenes can be isolated in 76–98 % yield. The aqueous catalyst solution can be recycled four times with decreasing activity; however, yields between 93 and 98 % can still be achieved with extended reaction times. Several water‐insoluble products can be isolated in excellent yield by simple filtration and purification by washing with water; this method is used, for the first time, for this type
合成了新的磺化四氢salen型配体及其水溶性钯(II)配合物。钯(II)配合物催化各种芳基卤化物(包括氯代芳烃)与末端炔烃的Sonogashira偶联(23个实例),在温和条件下(80°C,空气,无Cu I助催化剂)在有机水溶液中具有良好至优异的转化率混合物和周转频率高达2790 h -1。在优化的反应条件下,以最小化环境污染,可以分离出76.98%的二苯乙炔。催化剂水溶液可以降低活性地循环使用四次。但是,延长反应时间仍可实现93%至98%的收率。通过简单的过滤和水洗纯化,可以分离出几种不溶于水的产物,收率很高。这种方法首次用于这种CC耦合过程。