Efficient construction of C–C bonds from aryl halides/aryl esters with arylboronic acids catalysed by palladium(II) thiourea complexes
作者:Manikandan Thimma Sambamoorthy、Ramesh Rengan、Malecki Jan Grzegorz
DOI:10.1002/aoc.5181
日期:2019.11
Interestingly, the palladium(II) thiourea complexes showed the highest catalytic activity with 0.1 mol% catalyst loading in Suzuki–Miyaura cross‐coupling reactions utilizing a range of aryl bromides/unactivated aryl chlorides with arylboronic acids as coupling partners in aqueous–organic media. Syntheses of diaryl ketones using aryl esters and arylboronic acids as coupling partners were also achieved with low
已成功地合成了一组新的包含苯基(噻唑基)硫脲配体的钯(II)配合物,并借助分析和光谱(IR,UV-可见光和NMR)方法对其进行了表征。单晶X射线衍射法证实了新钯配合物中硫脲配体的N ^ S配位模式具有N ^ S配位模式的扭曲方平面几何结构。有趣的是,钯(II)硫脲配合物在铃木-宫浦交叉偶联反应中显示出最高的催化活性,催化剂负载量为0.1摩尔%,利用一系列芳基溴化物/未活化的芳基氯化物与芳基硼酸作为水性有机介质中的偶合伙伴。使用芳基酯和芳基硼酸作为偶合伙伴合成二芳基酮也可以在20小时内以较低的催化剂负载量实现。我们的催化剂的潜力通过其广泛的底物范围,低的催化剂负载量和高的分离产率得到了证明。此外,还研究了关键参数如溶剂,碱,温度和催化剂用量的影响。