Bimetallic copper/cobalt-cocatalyzed double aerobic phenol oxidation/cyclization toward π-extended benzofuro[2,3-<i>b</i>]indoles as electron donors for electroluminescence
作者:Muhammad Adnan Bashir、Yulong Zhang、Huaibin Yu、Bofei Wang、Weining Zhao、Fangrui Zhong
DOI:10.1039/d1gc01658j
日期:——
Benzofuro[2,3-b]indoles, apart from their attractive biological features, constitute a novel family of electron donors for electroluminescent materials. Reported herein is the establishment of a strategy involving bimetallic catalysis to form such π-conjugated extended frameworks, specifically via the CoCl2/Cu(OTf)2-catalyzed double aerobic oxidative cycloaddition of indoles with p-hydroquinone ester
苯并呋喃[2,3- b ]吲哚,除了其吸引人的生物学特征外,还构成了用于电致发光材料的新型电子供体家族。本文报道了涉及双金属催化以形成此类π-共轭扩展框架的策略的建立,特别是通过CoCl 2 /Cu(OTf) 2 -催化吲哚与对氢醌酯的双有氧氧化环加成。阐明了两种金属盐和醇溶剂的关键和不同作用。这种氧化系统能够破坏成熟的酸催化醌-吲哚 [3 + 2] 环加成反应,有利于苯并呋喃 [2,3- b]二氢吲哚,并且优于先前已知的涉及 Pd 催化与预官能化(伪)卤化物交叉偶联的多步合成方法。此外,对产物的光物理性质进行了初步研究,结果表明这些多环杂芳烃具有用于高效深蓝色有机发光二极管的潜力。