Synthesis of Multisubstituted Triphenylenes and Phenanthrenes by Cascade Reaction of <i>o</i>-Iodobiphenyls or (<i>Z</i>)-β-Halostyrenes with <i>o</i>-Bromobenzyl Alcohols through Two Sequential C–C Bond Formations Catalyzed by a Palladium Complex
作者:Masayuki Iwasaki、Yasuhiro Araki、Shohei Iino、Yasushi Nishihara
DOI:10.1021/acs.joc.5b01693
日期:2015.9.18
bearing both nucleophilic and electrophilic substituents, for the facile synthesis of polycyclic aromatic hydrocarbons. A palladium/electron-deficient phosphine catalyst efficiently coupled o-iodobiphenyls or (Z)-β-halostyrenes with o-bromobenzyl alcohols to afford triphenylenes and phenanthrenes, respectively. The present cascade reaction proceeded through deacetonative cross-coupling and sequential intramolecular
邻溴苄醇已被开发为一种新型的带有亲核和亲电取代基的环化试剂,可轻松合成多环芳烃。钯/电子不足的膦催化剂有效地将邻碘联苯或(Z)-β-卤代苯乙烯与邻溴苄醇偶联,分别制得三亚苯基和菲。目前的级联反应是通过去乙酰化交叉偶联和顺序分子内环化进行的。大量实验数据表明,反应机理涉及1,4-钯迁移的平衡。