86769-97-3Relevant academic research and scientific papers
Rhodium-Catalyzed Electrooxidative C?H Olefination of Benzamides
Ackermann, Lutz,Struwe, Julia,Zhang, Yan
supporting information, p. 15076 - 15080 (2020/06/20)
Metal-catalyzed chelation-assisted C?H olefinations have emerged as powerful tools for the construction of functionalized alkenes. Herein, we describe the rhoda-electrocatalyzed C?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, and with H2 as the only byproduct. This versatile alkenylation reaction also features broad substrate scope and used electricity as a green oxidant.
Cobalt(III)-Catalyzed C?H Activation: Counter Anion Triggered Desilylative Direct ortho-Vinylation of Secondary Benzamides
Muniraj, Nachimuthu,Prabhu, Kandikere Ramaiah
supporting information, p. 3579 - 3584 (2018/09/10)
A Co(III)-catalyzed counter anion triggered desilylative direct ortho-vinylation of secondary benzamides is reported. The reaction furnishes the alkenylated product, exclusively, and no formation of the possible cyclic products was observed. Mechanistic studies suggest that the counter anion, [SbF6]?, plays a crucial role in the desilylation. The utility of alkynylsilanes instead of terminal alkynes turned out to be a potential and practical approach to obtain the corresponding vinylated products. The developed methodology is compatible with a variety of functional groups. (Figure presented.).
Cobalt(III)?Catalyzed C?H Activation: A Secondary Amide Directed Decarboxylative Functionalization of Alkynyl Carboxylic Acids Wherein Amide NH-group Remains Unreactive
Muniraj, Nachimuthu,Prabhu, Kandikere Ramaiah
supporting information, p. 1370 - 1375 (2018/02/14)
A Co(III)-catalyzed C?H activation reaction for ortho-alkenylation of benzamides (aryl/heteroaryl) and C2-alkenylation of indole derivatives have been developed using alkynyl carboxylic acid as an alkene source. A high regioselectivity has been achieved i
Controlled mono-olefination: Versus diolefination of arenes via C-H activation in water: A key role of catalysts
Zhang, Hailong,Yang, Zhongzhen,Ma, Qiang,Liu, Jinxin,Zheng, Yang,Guan, Mei,Wu, Yong
supporting information, p. 3140 - 3146 (2018/07/13)
Herein, we report the olefination of arenes via C-H activation in water instead of in expensive and pollution-causing organic solvents. In this process, the catalysts were shown to play a key role in controlling mono- and diolefinations. More specifically
Intramolecular Hydroamidation of ortho-Vinyl Benzamides Promoted by Potassium tert-Butoxide/N,N-Dimethylformamide
Chen, Zhen-Yu,Wu, Liang-Yu,Fang, Hai-Sheng,Zhang, Ting,Mao, Zhi-Feng,Zou, Yong,Zhang, Xue-Jing,Yan, Ming
, p. 3894 - 3899 (2017/10/07)
An intramolecular hydroamidation of ortho-vinyl benzamides had been developed. The reaction was promoted efficiently by potassium tert-butoxide and N,N-dimethylformamide without the need for strong oxidants or transition-metal catalysts. A series of dihyd
Ru(II)-Catalyzed C-H Activation: Amide-Directed 1,4-Addition of the Ortho C-H Bond to Maleimides
Keshri, Puspam,Bettadapur, Kiran R.,Lanke, Veeranjaneyulu,Prabhu, Kandikere Ramaiah
, p. 6056 - 6065 (2016/07/26)
Maleimide has been used as a selective coupling partner to generate conjugate addition products exclusively. The typical Heck-type oxidative coupling that occurs when alkenes are used is avoided by choosing maleimide as an alkene, which cannot undergo β-hydride elimination due to the unavailability of a syn-periplanar β-hydrogen atom. The amide nitrogen, which is notorious for undergoing tandem reactions to generate spirocyclic or annulation products under cross-coupling conditions, remains innocent in this report. Along with the substrate scope, a robustness screen has been performed to analyze the performance of amide as a directing group in the presence of other directing groups and also to examine the tolerance of the reaction conditions for other frequently encountered functional groups.
Ru(II)/PEG-400 as a highly efficient and recyclable catalytic media for annulation and olefination reactions: Via C-H bond activation
Yedage, Subhash L.,Bhanage, Bhalchandra M.
, p. 5635 - 5642 (2016/10/21)
In this report synthesis of isoquinolinones, isocoumarins, and N-methyl isoquinolinones and olefination of the Weinreb amides by C-H bond activation using Ru(ii)/PEG-400 as green and recyclable media are documented. This developed methodology is capable o
Fujiwara-Moritani Reaction of Weinreb Amides using a Ruthenium-Catalyzed C-H Functionalization Reaction
Das, Riki,Kapur, Manmohan
supporting information, p. 1505 - 1512 (2015/07/07)
The ruthenium-catalyzed Fujiwara-Moritani reaction (oxidative-Heck reaction) of Weinreb amides is reported herein. The reaction affords exclusively ortho-C-H olefination products, has excellent substrate scope and tolerates halogen functionalities, which increase the synthetic utility of the method. A variety of activated olefins as well as styrenes can be employed as coupling partners. RU sure? The ruthenium-catalyzed Fujiwara-Moritani reaction (oxidative-Heck reaction) of Weinreb amides has been reported. The reaction affords exclusively ortho-C-H olefination products, has excellent substrate scope and tolerates halogen functionalities; this increases the synthetic utility of the method.
Re/Mg bimetallic tandem catalysis for [4+2] annulation of benzamides and alkynes via C-H/N-H functionalization
Tang, Qiuzheng,Xia, Dexin,Jin, Xiqing,Zhang, Qing,Sun, Xiao-Qiang,Wang, Congyang
, p. 4628 - 4631 (2013/05/21)
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.
