Photo-Induced Sonogashira CC Coupling Reaction Catalyzed by Simple Copper(I) Chloride Salt at Room Temperature
作者:Arunachalam Sagadevan、Kuo Chu Hwang
DOI:10.1002/adsc.201200683
日期:2012.12.14
conventional thermal Sonogashira CC coupling reaction requires the use of a palladium catalyst and a large amount of ligands. Although there were a few reports describing the use of inexpensive metal catalysts, such as, copper (Cu), iron (Fe), and nickel (Ni), for replacement of palladium (Pd) in the Sonogashira reactions, it was later questioned that the observed effects were due to ppb levels contamination
常规的热Sonogashira CC偶联反应需要使用钯催化剂和大量的配体。尽管有一些报道描述了在Sonogashira反应中使用廉价的金属催化剂,例如铜(Cu),铁(Fe)和镍(Ni)替代钯(Pd),但后来有人质疑说观察到的效果是由于反应所用试剂中ppb含量的Pd污染所致。在本文中,我们报道,在室温下,在蓝色LED光照射下,简单的氯化铜(I)氯化铜(CuCl)盐在没有Pd和配体的情况下可以高产率(80-99%)催化Sonogashira反应。对照实验表明,当氯化钯(II)(PdCl 2)被用来代替CuCl作为催化剂。研究了一系列富电子和贫电子的取代的芳基卤化物(溴化物和碘化物)以及芳基和烷基乙炔,并讨论了反应机理。