已经制备了具有两个三芳基甲醇中心和四个吡啶型取代基的底物。在布朗斯台德(Brønsted)超强酸CF 3 SO 3 H中电离后,底物会经历两种类型的反应。在仅超酸的存在下,高度离子化的中间体提供具有两个吡啶并[1,2- a ]吲哚环的双环化产物。加入苯,得到芳基化产物。提出了涉及四阳离子,五阳离子或六阳离子物种的机理。
已经制备了具有两个三芳基甲醇中心和四个吡啶型取代基的底物。在布朗斯台德(Brønsted)超强酸CF 3 SO 3 H中电离后,底物会经历两种类型的反应。在仅超酸的存在下,高度离子化的中间体提供具有两个吡啶并[1,2- a ]吲哚环的双环化产物。加入苯,得到芳基化产物。提出了涉及四阳离子,五阳离子或六阳离子物种的机理。
Bipyricorrole: A Corrole Homologue with a Monoanionic Core as a Fluorescence Zn<sup>II</sup>
Sensor
作者:B. Adinarayana、Ajesh P. Thomas、Prerna Yadav、Arun Kumar、A. Srinivasan
DOI:10.1002/anie.201508829
日期:2016.1.18
In the corrolehomologue, 6,11,16‐triarylbipyricorrole, the bipyrrole unit is replaced by a 2,2′‐bipyridine unit. This modification effectively alters the corrole N4 coordination sphere from the trianionic [(NH)3N] to the monoanionic [N3NH] state. The newly formed monoanioniccore stabilizes ZnII ions with enhanced emission properties. The enhanced emission was further utilized for metal ion sensing
Reductive Couplings of 2-Halopyridines without External Ligand: Phosphine-Free Nickel-Catalyzed Synthesis of Symmetrical and Unsymmetrical 2,2′-Bipyridines
作者:Lian-Yan Liao、Xing-Rui Kong、Xin-Fang Duan
DOI:10.1021/jo402084m
日期:2014.1.17
An unexpectedly facile synthetic approach for symmetrical and unsymmetrical 2,2'-bipyridines through the Ni-catalyzed reductive couplings of 2-halopyridines was developed. The couplings were efficiently catalyzed by 5 mol % of NiCl2 center dot 6H(2)O without the use of external ligands. A variety of 2,2'-bipyridines including caerulomycin F have been efficiently synthesized.