Predictable site-selective functionalization: Promoter group assisted <i>para</i>-halogenation of <i>N</i>-substituted <b>(</b>hetero<b>)</b>aromatics under metal-free condition
SEAr (electrophilic aromatic substitution) type reaction is disclosed. SEAr type reaction has been utilized for the C5-bromination of indolines (para-selective) with N-bromosuccinimide under metal and additive-free conditions in good to excellent yields. The developed methodology is also applicable for iodination and challenging chlorination. The pyrimidyl group is identified as a reactivity tuner
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。
Rhodium(III)-Catalyzed Direct CH Olefination of Arenes with Aliphatic Olefins
A rhodium(III)‐catalyzed direct ortho CH bond olefination of arenes, including but not limited to benzamides, arylpyridines and indoles, with a variety of unactivated aliphatic olefins has been developed. In the presence of catalytic amounts of dichloro(pentamethylcyclopentadienyl)rhodium(III) dimer [Cp*RhCl2]2}, copper(II) acetate monohydrate [Cu(OAc)2⋅H2O] and silver hexafluoroantimonate(V) (AgSbF6)
Copper-Catalyzed Direct C2-Benzylation of Indoles with Alkylarenes
作者:Hui-Jun Zhang、Feng Su、Ting-Bin Wen
DOI:10.1021/acs.joc.5b01935
日期:2015.11.20
The copper-catalyzed regioselective cross-dehydrogenativecoupling of N-pyrimidylindoles with benzylicC(sp3)–H bonds has been developed. Di-tert-butyl peroxide was employed as a mild oxidant, and benzaldehyde proved to be an effective additive. This reaction provides a direct and pratical route to a variety of 2-benzylindoles.
<scp>Rhodium‐Catalyzed</scp>
Direct C—H Alkenylation of Indoles with Alkenyl Borates
作者:Ze‐Tian Wang、Zi‐Ang Zheng、Peng‐Jie Li、Chun‐Ni Zhou、Shao‐Jun Cai、Biao Xiao、Liang Wang
DOI:10.1002/cjoc.202100221
日期:2021.10
A new Rh(III)-catalyzed directC—H alkenylation of 2,3-unsubstitued indoles with alkenyl borates through C—H activation followed by transmetallation was described. This protocol provides an efficient method for the synthesis of terminal C2-alkenylindoles under mild conditions, and also shows broad substrate scope and high functional group tolerance with respect to both components. Furthermore, the