Orthogonal and Auto-Tandem Catalysis: Synthesis of Dipyrido[1,2-<i>a</i>:2‘,3‘-<i>d</i>]imidazole and Its Benzo and Aza Analogues via Inter- and Intramolecular C−N Bond Formation
作者:Kristof T. J. Loones、Bert U. W. Maes、Caroline Meyers、Joke Deruytter
DOI:10.1021/jo052091u
日期:2006.1.1
The synthesis of dipyrido[1,2-a:2‘,3‘-d]imidazole and hitherto unknown benzo and aza analogues is described. These relatively complex polycyclic heterocycles could be smoothly prepared in one step from commercially available building blocks. Mechanistically, the developed procedure involves orthogonal (Pd and Cu catalyst) or auto-tandem (Pd catalyst) catalysis via regioselective inter- and intramolecular
描述了双吡啶并[1,2- a:2',3'- d ]咪唑和迄今未知的苯并氮杂类似物的合成。这些相对复杂的多环杂环可以一步一步从市售构件中顺利制备。从机理上讲,开发的方法涉及通过区域选择性分子间和分子内C-N键形成的正交(Pd和Cu催化剂)或自串联(Pd催化剂)催化。
Examination of the mechanism of the intramolecular amination of N-(3-bromopyridin-2-yl)azaheteroarylamines and N-(2-chloropyridin-3-yl)azaheteroarylamines: a Pd-catalyzed amination and/or a base-assisted nucleophilic aromatic substitution?
作者:Kristof T.J. Loones、Bert U.W. Maes、Wouter A. Herrebout、Roger A. Dommisse、Guy L.F. Lemière、Benjamin J. Van der Veken
DOI:10.1016/j.tet.2007.02.041
日期:2007.4
respectively. Depending on the substrate a Pd-catalyzed amination, a base-assisted nucleophilic aromatic substitution or a combination of both is occurring. An explanation based on the aromaticity of the amidine, supported by theoretical calculations, is provided. In addition we gained evidence that the intramolecular metal-catalyzed amination of N-(3-bromopyridin-2-yl)azaheteroarylamines and N-(2-ch