The reaction of N-heteroaromatic compounds, such as 2-aryl-pyrrole, benzimidazole, imidazole, indole, and pyrazole derivatives, with alkynes in the presence of a catalytic amount of a nickel complex results in C–H/N–H oxidative annulation. The reaction shows a high functional group compatibility. While both Ni(0) and Ni(II) complexes show a high catalytic activity, Ni(0) is proposed as a key catalytic
N-杂芳族化合物(例如 2-芳基吡咯、苯并咪唑、咪唑、吲哚和吡唑衍生物)与炔烃在催化量的镍配合物存在下发生反应,导致 C-H/N-H 氧化成环。该反应表现出较高的官能团相容性。虽然Ni(0)和Ni( II )配合物均表现出高催化活性,但Ni(0)被认为是主催化循环中的关键催化物种。在 Ni( II ) 体系的情况下,反应的进行需要催化量的强碱(例如 KOBu t )的存在。与此形成鲜明对比的是,Ni(0) 系统不需要碱。所提出的机制得到了 DFT 研究的支持。
(Benz)Imidazole-Directed Cobalt(III)-Catalyzed C-H Activation of Arenes: A Facile Strategy to Access Polyheteroarenes by Oxidative Annulation
作者:Pratip Kumar Dutta、Subhabrata Sen
DOI:10.1002/ejoc.201801056
日期:2018.11.1
Cobalt catalyzed (benz)imidazole‐directedC–Hactivation of arenes provides access to polyheteroarenes by oxidative annulation.
钴催化(苯并)咪唑导向的芳烃的C–H活化可通过氧化环化获得聚杂芳烃。
Ruthenium catalyzed oxidative annulation with alkynes via cascade C–H/N–H bond functionalizations
作者:Rui Wang、J.R. Falck
DOI:10.1016/j.jorganchem.2014.02.014
日期:2014.6
Ruthenium(II)complexes catalyzed tandem C-H/N-H bonds functionalizations of 2-phenyl imidazole and its derivatives with alkynes were realized. This transformations allowed for rapid synthesis of isoquinoline derivatives under open-flask condition.
Fluorescent Naphthyl- and Anthrylazoles from the Catalytic Coupling of Phenylazoles with Internal Alkynes through the Cleavage of Multiple CH Bonds
The present invention relates to metal complexes and to electronic devices, in particular organic electroluminescent devices, comprising these metal complexes.