Divergent Coupling of Anilines and Enones by Integration of C−H Activation and Transfer Hydrogenation
作者:Xukai Zhou、Jintao Xia、Guangfan Zheng、Lingheng Kong、Xingwei Li
DOI:10.1002/anie.201803347
日期:2018.5.28
Cp*RhIII/IrIII complexes are known to play important roles in both C−Hactivation and transferhydrogenation (TH). However, these two areas evolved separately. They have been integrated in redox‐ and chemodivergent coupling reactions of N‐pyridylanilines with enones. The iridium‐catalyzed coupling with enones leads to the efficient synthesis of tetrahydroquinolines through TH from iPrOH. Counterintuitively
已知Cp * Rh III / Ir III络合物在CH活化和转移氢化(TH)中均起重要作用。但是,这两个领域是分别发展的。它们已被整合到N-吡啶基苯胺与烯酮的氧化还原和化学扩散偶联反应中。铱与烯酮的催化偶联可通过i PrOH通过TH高效合成四氢喹啉。违反直觉,i PrOH不能作为唯一的氢化物来源,主要的反应途径涉及二氢喹啉中间体的歧化,然后会聚和迭代地还原喹啉类。
Cobalt-Catalyzed Regioselective Ortho C(sp<sup>2</sup>)-H Bond Nitration of Aromatics through Proton-Coupled Electron Transfer Assistance
作者:Desaboini Nageswar Rao、Sk. Rasheed、Gaurav Raina、Qazi Naveed Ahmed、Chaitanya Kumar Jaladanki、Prasad V. Bharatam、Parthasarathi Das
DOI:10.1021/acs.joc.7b00808
日期:2017.7.21
A cobalt-catalyzed proton-coupled electron transfer (PCET) mediated regioselective ortho-specific nitration of aromatic C(sp2)-H bonds using chelation-assisted removable vicinal diamine directing groups was developed. The reaction proceeded under mild conditions in the presence of Co(OAc)2·4H2O as the catalyst with AgNO2 utilized as the nitro source as well as terminal oxidant in the presence of O2