Regioselective Copper-Catalyzed Oxidative Coupling of α-Alkylated Styrenes with Tertiary Alkyl Radicals
作者:Cong Wang、Rui-Hua Liu、Ming-Qing Tian、Xu-Hong Hu、Teck-Peng Loh
DOI:10.1021/acs.orglett.8b01600
日期:2018.7.6
A radical-mediated oxidative cross-coupling of readily accessible α-alkylated styrenes with 1,3-dicarbonyl compounds utilizing a combination of Cu(OAc)2 and air as a catalytic system is described. Rather than requiring α-halocarbonyl compounds, this efficient approach enables direct installation of tertiary functionalized alkyl motifs to olefins with simple carbonyl derivatives. The novel protocol
描述了利用Cu(OAc)2和空气的组合作为催化体系的易获得的α-烷基化苯乙烯与1,3-二羰基化合物的自由基介导的氧化交叉偶联。不需要α-卤代羰基化合物,这种有效的方法能够将叔官能化的烷基基序直接安装到具有简单羰基衍生物的烯烃上。该新方案的特征是通过竞争性的β-H消除具有很高的烯丙基选择性。自由基钟和捕获实验都为α-酮碳中心自由基的中间体提供了明确的证据。