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
The rhodium-catalyzed selective oxidative Heck reaction of amides with allylic esters
作者:Yu-Yuan Hei、Jian-Lan Song、Xin-Chen Zhan、Xing-Guo Zhang、Chen-Liang Deng
DOI:10.1016/j.tetlet.2019.05.012
日期:2019.6
The Rh-catalyzed direct selectiveoxidation Heck reaction of benzamides with allylic esters has been developed for the synthesis of amides and isoquinolin-1-ones. According to the functional groups on N-atom, benzamides or isoquinolin-1-ones were synthesized under optimal reaction conditions. The ambient catalytic system has good functional group tolerance, afforded corresponding products in moderate
cyclopentadienyl (Cp)-Rh(III) complex, bearing ester and pendant amide moieties on the Cpring [CpARh(III)], is able to catalyze the aerobic oxidative olefination of benzamides, bearing nonspecial carbamoyl groups, with styrenes including disubstituted ones at relatively low temperature (60–80 °C). The presence of both the ester and pendant acidic N-phenylcarbamoyl moieties on the CpA ligand play important
已经确定,新开发的中等电子缺陷的环戊二烯基(Cp)-Rh(III)配合物在Cp环[Cp A Rh(III)]上带有酯和侧基酰胺部分,能够催化好氧氧化烯化反应带有非特殊氨基甲酰基基团的苯甲酰胺,在相对较低的温度(60–80°C)下含苯乙烯,包括二取代的苯甲酰胺。Cp A配体上的酯和酸性N-苯基氨基甲酰基侧基的存在在促进催化的过程中起着重要作用,同时又不影响配合物的热稳定性。
Rhodium-Catalyzed Oxidative Olefination of CH Bonds in Acetophenones and Benzamides
作者:Frederic W. Patureau、Tatiana Besset、Frank Glorius
DOI:10.1002/anie.201006222
日期:2011.2.1
A good neighborhood! The metal‐catalyzed oxidativeCH functionalization of electron‐rich arenes is well‐established, but analogous reactions of electron‐poor substrates are rare. A new application makes use of common electron‐withdrawing functional groups (COMe, CONH2, CONEt2) in the rhodium‐catalyzed oxidative Heck reaction to generate complex organic molecules. Cp*= η5‐C5Me5.