Visible‐Light‐Induced [4+2] Annulation of Thiophenes and Alkynes to Construct Benzene Rings
作者:Chunlan Song、Xin Dong、Zhongjie Wang、Kun Liu、Chien‐Wei Chiang、Aiwen Lei
DOI:10.1002/anie.201905971
日期:2019.8.26
The [4+2] annulation represents an elegant and versatile synthetic protocol for the construction of benzene rings. Herein, a strategy for visible-light induced [4+2] annulation of thiophenes and alkynes, to afford benzene rings, is presented. Under simple and mild reaction conditions, the ready availability and structural diversity of thiophenes and alkynes permit the facile synthesis of several substituted
[4 + 2]环空表示用于苯环构建的优雅且通用的合成方案。在本文中,提出了一种策略,用于可见光诱导的噻吩和炔烃的[4 + 2]环化,以提供苯环。在简单温和的反应条件下,噻吩和炔烃的易得性和结构多样性允许轻松合成数个取代的芳环。有价值的药物和氨基酸也被很好地耐受。此外,DFT计算解释了该反应的高区域选择性。