Mechanistic Investigation of the Nickel-Catalyzed Suzuki Reaction of <i>N</i>,<i>O</i>-Acetals: Evidence for Boronic Acid Assisted Oxidative Addition and an Iminium Activation Pathway
作者:Kevin T. Sylvester、Kevin Wu、Abigail G. Doyle
DOI:10.1021/ja3079362
日期:2012.10.17
recently reported Suzuki coupling reaction of quinoline-derived allylic N,O-acetals has been studied using a combination of structural, stereochemical, and kinetic isotope effect experiments. The data indicate that C-O activation is facilitated by Lewis acid assistance from the boronic acid coupling partner and an ionic S(N)1-like mechanism accounts for oxidativeaddition. In this context, we demonstrate
最近报道的喹啉衍生的烯丙基 N,O-缩醛的 Suzuki 偶联反应的机制已使用结构、立体化学和动力学同位素效应实验的组合进行了研究。数据表明,来自硼酸偶联伙伴的路易斯酸辅助促进了 CO 活化,并且离子 S(N)1 样机制解释了氧化加成。在这种情况下,我们首次直接观察到喹啉盐的氧化加成。值得注意的是,这种机制不同于更常见的 S(N)2(') 型低价过渡金属氧化加成到大多数烯丙基亲电试剂。