本文公开了通过 S E Ar(亲电芳族取代)型反应对N-嘧啶基(杂)芳烃进行区域选择性对-C-H 卤化。S E Ar 型反应已用于二氢吲哚的 C5-溴化(对位选择性)与N-溴代琥珀酰亚胺在无金属和无添加剂的条件下具有良好至极好的收率。所开发的方法也适用于碘化和具有挑战性的氯化。嘧啶基被确定为反应性调节剂,它也控制区域选择性。本方法也适用于苯胺、吡啶、吲哚、羟吲哚、吡唑、四氢喹啉、异喹啉和咔唑的选择性卤化。Fukui 亲核性和自然电荷图等 DFT 研究也支持观察到的p-选择性。标题化合物后官能化为相应的芳基化、烯化和二卤化产物是通过一锅两步的方式实现的。还对药物/天然分子(哈明、依托考昔、可乐定和氯唑沙宗)进行了后期 C-H 溴化,以证明所开发方案的适用性。
作者:Shengjun Ni、Matic Hribersek、Swarna K. Baddigam、Fredric J. L. Ingner、Andreas Orthaber、Paul J. Gates、Lukasz T. Pilarski
DOI:10.1002/anie.202010202
日期:2021.3.15
The mechanochemical, solvent‐free, highly regioselective, rhodium‐catalyzed C−Hmethylation of (hetero)arenes is reported. The reaction shows excellent functional‐group compatibility and is demonstrated to work for the late‐stage C−Hmethylation of biologically active compounds. The method requires no external heating and benefits from considerably shorter reaction times than previous solution‐based
A site-selective dual C-7 and C-6 C-H functionalization of indolines with azabenzonorbornadienes has been accomplished using Rh-catalysis. The reaction affords a potential route toward pyrrolocarbazoles with broad scope and functional group tolerance.
Photoredox/Palladium Dual Catalysis for Site-Selective C–H Arylation and Acylation of <i>N</i>-Protected Carbazoles in Visible Light