Cu-Catalyzed Cyanation of Arylboronic Acids with Acetonitrile: A Dual Role of TEMPO
作者:Yamin Zhu、Linyi Li、Zengming Shen
DOI:10.1002/chem.201501823
日期:2015.9.14
acetonitrile as the “CN” source has been achieved under a Cu(cat.)/TEMPO system (TEMPO=2,2,6,6‐tetramethylpiperidine N‐oxide). The broad substrate scope includes a variety of electron‐rich and electron‐poor arylboronic acids, which react well to give the cyanated products in high to excellent yields. Mechanistic studies reveal that TEMPOCH2CN, generated in situ, is an active cyanating reagent, and shows high
在Cu(cat。)/ TEMPO系统(TEMPO = 2,2,6,6-四甲基哌啶N-氧化物)下,通过使用乙腈作为“ CN”源实现了芳基硼酸的氰化。广泛的底物范围包括各种富电子和贫电子的芳基硼酸,它们能很好地反应,从而以高收率或优异的收率得到氰化产物。机制研究揭示,TEMPO CH 2 CN,在原位产生,是有源氰化试剂,并示出了对于CN的形成高反应性-部分。而且,TEMPO充当廉价的氧化剂,使反应能够在铜中催化。