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。
Aerobic Oxidative Cross-Coupling of Substituted Acrylamides with Alkenes Catalyzed by an Electron-Deficient CpRh<sup>III</sup> Complex
作者:Ryo Yoshimura、Yu Shibata、Ken Tanaka
DOI:10.1021/acs.joc.9b01733
日期:2019.10.18
It has been established that an electron-deficient CpRhIII complex, bearing two ester moieties on the Cp ring, [CpERhIII], catalyzes the aerobic oxidative cross coupling of substituted acrylamides with both activated and unactivated alkenes, leading to (2Z,4E)-dienamides, at relatively low temperature (80 °C). Importantly, tertiary, secondary, and primary amide directing groups could equally be used
An Efficient and General Method for the Heck and Buchwald–Hartwig Coupling Reactions of Aryl Chlorides
作者:Dong-Hwan Lee、Abu Taher、Shahin Hossain、Myung-Jong Jin
DOI:10.1021/ol202177k
日期:2011.10.21
The β-diketiminatophosphane Pd complex acted as a powerful catalyst for the Heck coupling of aryl chlorides with alkenes. Various aryl and heteroaryl chlorides were coupled efficiently under relatively mild conditions. Furthermore, this catalytic system also proved to be highly active in the Buchwald–Hartwig coupling of deactivated and sterically hindered aryl chlorides at room temperature.
Cobalt–Tertiary-Amine-Mediated Hydroxytrifluoromethylation of Alkenes with CF<sub>3</sub>Br and Atmospheric Oxygen
作者:Qiankun Li、Wu Fan、Deqian Peng、Bingyin Meng、Shaohan Wang、Rui Huang、Shihao Liu、Suhua Li
DOI:10.1021/acscatal.0c00498
日期:2020.4.3
The mild and efficient hydroxytrifluoromethylation of alkenes with bromotrifluoromethane (CF3Br) and atmospheric oxygen mediated by cobalt-tertiary amine is described. This reaction proceeds with broad substrate scope and good functional group compatibility. Mechanistic studies indicate that the reaction proceeds through a radical pathway, which is enabled by combination of the previously unexplored
An iridium-catalyzed C–H allylation of acrylamides with conjugated dienes was developed, using NH-Ts amide as the directing group. The ligand- and additive-free protocol provided a convenient and atom economic synthesis of branched 1,4-diene skeletons, enabling the tolerance of a wide scope of functionalities such as OMe, F, Cl, Br and CF3. The utility of this protocol is also demonstrated by a preparative