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。