作者:Xinpeng Jiang、Yong Liu、Lei Zhang、Jinkang Chen、Kang Cheng、Chuanming Yu
DOI:10.1055/s-0036-1590914
日期:2018.1
(XPhos) catalytic system was developed for C–H allylation of polyfluoroarenes with allylic pivalates. The reactions showed excellent functional-group tolerance, good yields, and high regioselectivities. Mechanistic investigations supported a (π-allyl)palladium complex pathway through a directed oxidative addition of the allylic pivalate to palladium, followed by sequential nucleophilic attack by the polyfluorobenzene
开发了一种高效的 1,5-环辛二烯-PdCl2/二环己基(2',4',6'-三异丙基联苯-2-基)膦(XPhos)催化体系,用于多氟芳烃与烯丙基新戊酸酯的 C-H 烯丙基化。该反应表现出优异的官能团耐受性、良好的产率和高区域选择性。机理研究支持(π-烯丙基)钯络合物途径,通过将烯丙基新戊酸酯定向氧化加成到钯上,然后是多氟苯的连续亲核攻击和还原消除。在克级反应中,0.5 mol% 的钯负载足以以良好的收率提供所需的产物。