Re/Mg Bimetallic Tandem Catalysis for [4+2] Annulation of Benzamides and Alkynes via C-H/N-H Functionalization
摘要:
A rhenium-magnesium cocatalyzed [4+2] annulation of benzamides and alkynes via C-H/N-H functionalization is described. The reaction features a divergent and high level of diastereoselectivities, which are readily switchable by subtle tuning of reaction conditions. Thus, a wide range of both cis- and trans-3,4-dihydroisoquinolinones is expediently synthesized in a highly atom-economical manner. Moreover, mechanistic studies unraveled a tandem mode of action between rhenium and magnesium in the catalytic cycles.
Rhodium‐Catalyzed Electrooxidative C−H Olefination of Benzamides
作者:Yan Zhang、Julia Struwe、Lutz Ackermann
DOI:10.1002/anie.202005257
日期:2020.8.24
Metal‐catalyzed chelation‐assisted C−H olefinations have emerged as powerful tools for the construction of functionalized alkenes. Herein, we describe the rhoda‐electrocatalyzedC−H activation/alkenylation of arenes. The olefinations of challenging electron‐poor benzamides were thus accomplished in a fully dehydrogenative fashion under electrochemical conditions, avoiding stoichiometric chemical oxidants
金属催化螯合辅助的 C-H 烯化已成为构建功能化烯烃的有力工具。在此,我们描述了 rhoda 电催化芳烃的 C-H 活化/烯基化。因此,具有挑战性的贫电子苯甲酰胺的烯烃化在电化学条件下以完全脱氢的方式完成,避免了化学计量的化学氧化剂,并且 H 2作为唯一的副产物。这种通用的烯基化反应还具有广泛的底物范围和使用电力作为绿色氧化剂。
Intramolecular Hydroamidation of <i>ortho</i>
-Vinyl Benzamides Promoted by Potassium <i>tert</i>
-Butoxide/<i>N,N</i>
-Dimethylformamide
作者:Zhen-yu Chen、Liang-yu Wu、Hai-sheng Fang、Ting Zhang、Zhi-feng Mao、Yong Zou、Xue-jing Zhang、Ming Yan
DOI:10.1002/adsc.201700369
日期:2017.11.23
An intramolecular hydroamidation of ortho-vinyl benzamides had been developed. The reaction was promoted efficiently by potassiumtert-butoxide and N,N-dimethylformamide without the need for strong oxidants or transition-metal catalysts. A series of dihydroisoquinolinones and 3-benzylisoindolinones were prepared in good to excellent yields. The new method is operationally simple, scalable, and tolerant
Cobalt(III)-Catalyzed C−H Activation: Counter Anion Triggered Desilylative Direct <i>ortho-</i>
Vinylation of Secondary Benzamides
作者:Nachimuthu Muniraj、Kandikere Ramaiah Prabhu
DOI:10.1002/adsc.201800649
日期:2018.9.17
A Co(III)‐catalyzedcounteraniontriggereddesilylativedirectortho‐vinylation of secondarybenzamides is reported. The reaction furnishes the alkenylated product, exclusively, and no formation of the possible cyclic products was observed. Mechanistic studies suggest that the counteranion, [SbF6]−, plays a crucial role in the desilylation. The utility of alkynylsilanes instead of terminal alkynes
Ru(<scp>ii</scp>)/PEG-400 as a highly efficient and recyclable catalytic media for annulation and olefination reactions via C–H bond activation
作者:Subhash L. Yedage、Bhalchandra M. Bhanage
DOI:10.1039/c6gc01581f
日期:——
In this report synthesis of isoquinolinones, isocoumarins, N-methyl isoquinolinones and olefination of Weinreb amides by C-H bondactivation using Ru(II)/PEG-400 as green and recyclable media is documented. This developed methodology...