A rational protocol for the synthesis of 1-(2-pyridyl)isoquinolines
摘要:
Aza-Diels-Alder reaction between 3-(2-pyridyl)-1,2,4-triazines and 1-morpholinocyclohexene followed by aromatization of the cyclohexene moiety affords 1-(2-pyridyl)isoquinolines. Crystal structures of two tetrahydroisoquinolines were confirmed by X-ray diffraction analysis.
A new and straightforward procedure is described for the preparation of highly substituted pyridines and pyridazines. The method involves a Diels-Alder/retro-Diels-Alder sequence leading to dihydropyridine or related intermediates, which can be aromatized to pyridines and pyridazines by treatment with silica gel. The value of this procedure has been demonstrated with a one-step -synthesis of an E-ring-modified
描述了一种新的、直接的方法来制备高度取代的吡啶和哒嗪。该方法涉及 Diels-Alder/retro-Diels-Alder 序列,导致二氢吡啶或相关中间体,可以通过硅胶处理将其芳构化为吡啶和哒嗪。该程序的价值已通过 E 环修饰的类固醇的一步合成得到证明。
Improved Methodologies for the Preparation of Highly Substituted Pyridines
作者:Yolanda Fernández Sainz、Steven A. Raw、Richard J. K. Taylor
DOI:10.1021/jo0518304
日期:2005.11.1
Two separate strategies have been developed for the preparation of highly substituted pyridines from 1,2,4-triazines via the inverse-electron-demand Diels−Alder reaction: a microwave-promoted, solvent-free procedure and a tethered imine-enamine (TIE) approach. Both routes avoid the need for a discrete aromatization step and offer significant advantages over the classical methods, giving a wide variety
Highly substituted pyridines via tethered imine–enamine (TIE) methodology
作者:Steven A. Raw、Richard J. K. Taylor
DOI:10.1039/b316107b
日期:——
A tethered imineâenamine methodology has been developed for the direct conversion of 1,2,4-triazines into highly substituted pyridines via the inverse electron demand DielsâAlder reaction which avoids the need for a discrete aromatisation step. This TIE methodology has also been applied in one pot reaction cascades involving 1,2,4-triazines and utilising MnO2-mediated tandem oxidation processes (TOPs).
一种束缚亚胺-烯胺方法已被开发出来,用于通过逆电子需求狄尔斯-阿尔德反应将 1,2,4-三嗪直接转化为高度取代的吡啶,从而避免了离散芳构化步骤的需要。这种 TIE 方法也已应用于涉及 1,2,4-三嗪并利用 MnO2 介导的串联氧化过程 (TOP) 的一锅反应级联中。
Synthesis and characterizations of new cadmium complexes based on poly(aza)arene-annelated 2,2′-bipyridines
作者:Dmitry S. Kopchuk、Pavel A. Slepukhin、Igor S. Kovalev、Albert F. Khasanov、Olga S. Taniya、Olga V. Shabunina、Grigory V. Zyryanov、Vladimir L. Rusinov、Oleg N. Chupakhin
DOI:10.1016/j.poly.2016.02.047
日期:2016.5
We have developed an efficient synthesis of new cadmium(II)-containing complexes based on poly(aza) arene-annelated 2,2'-bipyridines. All the complexes were characterized by X-ray structural analysis. The influence of the type of the ligand at the structural properties of the complexes has been studied. (C) 2016 Elsevier Ltd. All rights reserved.