Activation of Alcohols with Carbon Dioxide: Intermolecular Allylation of Weakly Acidic Pronucleophiles
作者:Simon B. Lang、Theresa M. Locascio、Jon A. Tunge
DOI:10.1021/ol502023d
日期:2014.8.15
coupling of allyl alcohols with nitroalkanes, nitriles, and aldehydes using catalytic Pd(PPh3)4 has been accomplished via activation of C–OH bonds with CO2. The in situ formation of carbonates from alcohols and CO2 facilitates oxidative addition to Pd to form reactive π-allylpalladium intermediates. In addition, the formation of a strong base activates nucleophiles toward the reaction with the π-allylpalladium
使用催化 Pd(PPh 3 ) 4的烯丙醇与硝基烷烃、腈和醛的直接偶联是通过用 CO 2活化 C-OH 键来实现的。由醇和CO 2原位形成碳酸盐有利于Pd的氧化加成,形成反应性π-烯丙基钯中间体。此外,强碱的形成会激活亲核试剂与 π-烯丙基钯亲电子试剂发生反应。总体而言,这种原子经济反应无需使用外部碱即可提供新的 C-C 键,并生成水作为唯一的副产物。