An inexpensive and highly stable ligand 1,4-bis(2-hydroxy-3,5-di-tert-butylbenzyl)piperazine for Mizoroki–Heck and room temperature Suzuki–Miyaura cross-coupling reactions
作者:Sasmita Mohanty、D. Suresh、Maravanji S. Balakrishna、Joel. T. Mague
DOI:10.1016/j.tet.2007.10.081
日期:2008.1
characterized. The palladium catalyst was formed by combination of 1 with [Cl2Pd(COD)] in a ratio of 1:1, tested in the Suzuki–Miyaura and Mizoroki–Heck cross-coupling reactions. Coupling of a variety of aryl bromides with phenylboronic acid using methanol as solvent at room temperature, or at 60 °C, gave generally high yields of coupled products. Coupling of aryl chlorides with organoboron reagent at
合成并表征了庞大,便宜且简单的双齿配体1,4-双(2-羟基-3,5-二叔丁基苄基)哌嗪(1)。钯催化剂是由1与[Cl 2Pd(COD)]的比例为1:1,在Suzuki–Miyaura和Mizoroki–Heck交叉偶联反应中进行了测试。在室温下或在60°C下,使用甲醇作为溶剂,将各种芳基溴化物与苯基硼酸偶联,通常可得到高收率的偶联产物。在有氧条件下,在110°C的DMF中,芳基氯与有机硼试剂的偶联产生良好的联芳基收率。这种无磷,对空气和湿气稳定的催化剂,在60°C的甲醇中与各种芳基氯化物和溴化物发生的Mizoroki-Heck偶联反应中也显示出良好的活性。