Highly Efficient Pd/Tetraphosphine Catalytic System for Copper-Free Sonogashira Reactions of Aryl Bromides with Terminal Alkynes
作者:Tao Yi、Min Mo、Hai-Yan Fu、Rui-Xiang Li、Hua Chen、Xian-Jun Li
DOI:10.1007/s10562-012-0796-2
日期:2012.5
In this study, an easily synthesized polydentate ligand N,N,N’,N’-tetra(diphenylphosphinomethyl)-1,2-ethylenediamine (1) in combination with [Pd(C3H5)Cl]2 was found to be an active catalyst in copper-free Sonogashira reactions. Most substrates, including steric hindered phenyl bromides and heteroaryl bromides, could couple efficiently with terminal alkynes in the presence of low catalyst loading (0
在这项研究中,发现一种易于合成的多齿配体 N,N,N',N'-四(二苯基膦甲基)-1,2-乙二胺 (1) 与 [Pd(C3H5)Cl]2 结合是一种活性催化剂在无铜 Sonogashira 反应中。大多数底物,包括位阻苯基溴化物和杂芳基溴化物,可以在低催化剂负载量(0.1 mol%)存在下与末端炔烃有效偶联,并且该催化体系显示出优异的官能团耐受性。还通过原位31P NMR初步研究了水在该体系中的影响;也就是说,适当的水有利于反应,而过量的水会阻碍反应。 图文摘要一个简单的配体 N,N,N',N'-四(二苯基膦甲基)-1,在没有铜或任何其他添加剂的情况下,2-乙二胺以相对较低的催化剂负载量用于 Sonogashira 反应,分离产率高达 99%。该催化体系表现出高效率和优异的官能团耐受性。