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
研究了N-(3-溴吡啶-2--2-基)氮杂杂环芳基胺和N-(2-氯吡啶-3--3-基)氮杂杂环芳基胺的分子内胺化作用。通过这种方式,我们揭示了2,3-二溴吡啶与氨基(苯并)(di)嗪和2-chloro-3-的自动串联胺化(分子间和分子内Pd催化胺化)中的闭环反应机理。碘吡啶分别与氨基(苯并)(二)嗪。取决于底物,发生Pd催化的胺化,碱辅助的亲核芳族取代或两者的组合。提供了基于theoretical的芳香性的解释,并得到了理论计算的支持。此外,我们获得了证据表明分子内金属催化的N胺化-(3-溴吡啶基-2-基)氮杂杂环芳基胺和N-(2-氯吡啶基-3-基)氮杂杂环芳基胺的确包含未被氢原子取代的氮原子。