Rh-Catalyzed Oxidative Coupling between Primary and Secondary Benzamides and Alkynes: Synthesis of Polycyclic Amides
作者:Guoyong Song、Dan Chen、Cheng-Ling Pan、Robert H. Crabtree、Xingwei Li
DOI:10.1021/jo101596d
日期:2010.11.5
synthesis of isoquinolones from benzamides and alkynes via the oxidative ortho C−Hactivation of benzamides has been developed. Ag2CO3 proved to be an optimal oxidant when MeCN was used as a solvent, and [RhCp*Cl2]2 was utilized as an efficient catalyst. Both N-alkyl and N-aryl secondary benzamides can be applied as effective substrates. Furthermore, primary benzamides react with two alkyne units, leading
已开发出一种方法,可通过苯甲酰胺的氧化邻位C-H活化从苯甲酰胺和炔烃高产且轻松地合成异喹诺酮。当以MeCN为溶剂和[RhCp * Cl 2 ] 2时,Ag 2 CO 3被证明是最佳氧化剂。被用作有效的催化剂。N-烷基和N-芳基仲苯甲酰胺都可以用作有效的底物。此外,一级苯甲酰胺与两个炔烃单元反应,通过双重CH活化和氧化偶合生成三环产物。还证明了与结构相关的1-羟基异喹啉的反应性,其中可以同时生成含N和O的rhodocyclic中间体,从而导致构建不同的含O或N的杂环。
One-Pot Unsymmetrical {[4 + 2] and [4 + 2]} Double Annulations of <i>o</i>/<i>o</i>′-C–H Bonds of Arenes: Access to Unusual Pyranoisoquinolines
作者:Majji Shankar、Koushik Ghosh、Kallol Mukherjee、Raja K. Rit、Akhila K. Sahoo
DOI:10.1021/acs.orglett.8b02068
日期:2018.9.7
With the aid of a transformable sulfoximine directing group, unprecedented one-pot unsymmetrical double annulations [4 + 2] and [4 + 2]} of hetero(arenes) with alkynes are revealed under Ru(II) catalysis. Functionalization of both ortho-C–H bonds of (hetero)arene is reflected in the building of unusual 6,6-fused pyranoisoquinoline skeletons. Construction of four [(C–C)–(C–N) and (C–C)–(C–O)] bonds
Ruthenium-Catalyzed Isoquinolone Synthesis through CH Activation Using an Oxidizing Directing Group
作者:Bin Li、Huiliang Feng、Shansheng Xu、Baiquan Wang
DOI:10.1002/chem.201102445
日期:2011.11.4
The oxidant directs: A mild, practical, efficient, and regioselective Ru‐catalyzed isoquinolone synthesis with a broad substrate scope was reported (see scheme). In this redox neutral process, the aromatic CH bond functionalization can be performed at room temperature without using any external oxidant. The mechanism of the reaction was probed, and it was found that CH activation is the turnover‐limiting
Access to Sultams by Rhodium(III)-Catalyzed Directed CH Activation
作者:Manh V. Pham、Baihua Ye、Nicolai Cramer
DOI:10.1002/anie.201206191
日期:2012.10.15
Director's cut: The pharmaceutically relevant sulfonamide group is shown to be a competent directing group for [Cp*Rh(OAc)2]‐catalyzed CH functionalizations. Reactions of the cyclometalated intermediate with internal alkynes provide access to a wide range of sultam derivatives. The reaction is high yielding and works best under aerobic conditions with catalytic amounts of CuOAc as an oxidation mediator
导演剪辑:药学相关磺酰胺基团被证明是一个主管定向基团的[Cp *的Rh(OAc)2 ]催化的ç ħ官能化。环金属化中间体与内部炔烃的反应提供了广泛的苏丹阿马衍生物的途径。该反应收率高,在有氧条件下以催化量的CuOAc作为氧化介质可达到最佳效果。Cp * = C 5 Me 5。
<i>N</i>-Sulfonylcarboxamide as an Oxidizing Directing Group for Ruthenium-Catalyzed C-H Activation/Annulation
作者:Elina Petrova、Dace Rasina、Aigars Jirgensons
DOI:10.1002/ejoc.201601582
日期:2017.4.3
N-Sulfonylcarboxamides can act as both a directinggroup for C–H activation and an internal oxidant in the Ru-catalyzedannulation reaction with alkynes to give isoquinolones. Of all of the N-sulfonylcarboxamides that were studied, the N-(2,6-difluorophenyl)sulfonamide derivatives were found to be the most efficient and led to the formation of an unstable sulfinate byproduct that decomposed into 1