Aromatic Homologation by Non-Chelate-Assisted Rh<sup>III</sup>-Catalyzed CH Functionalization of Arenes with Alkynes
作者:Manh V. Pham、Nicolai Cramer
DOI:10.1002/anie.201310723
日期:2014.3.24
synthesis is the catalyzed aromatic annulation of a smaller arene with two alkyne molecules. Besides difunctionalized starting materials, directed CH functionalization can be used for such aromatic homologation. However, thus far the requirement of either pre‐functionalized substrates or suitable directing groups were limiting this approach. Herein, we describe a rhodium(III)‐catalyzed method allowing the
较大的缩合芳烃因其电和光化学性质而备受关注。一种有效的合成方法是使用两个炔烃分子催化较小的芳烃进行芳族环化反应。除了双官能化的起始材料,定向Ç H官能化可用于这种芳族同源。但是,到目前为止,对预功能化底物或合适的导向基团的要求限制了这种方法。在本文中,我们描述了铑(III)催化的方法,允许使用完全无偏的芳烃和内部炔烃。该反应在2-乙基己酸铜(II)和十溴二苯醚作为氧化剂的组合中效果最佳。这种芳族环化耐受各种官能团,并提供均聚的缩合芳烃。除了简单的苯之外,萘和更高的缩合芳烃还提供了获得具有重要电子和光物理性质的高度取代和高度溶解的并苯结构的途径。