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
已经开发了两种单独的策略,用于通过反电子需求的Diels-Alder反应从1,2,4-三嗪制备高度取代的吡啶:微波促进的无溶剂程序和束缚的亚胺-烯胺(TIE ) 方法。两种途径都避免了需要离散的芳构化步骤,并且与传统方法相比具有明显的优势,从而以高的,优化的产率提供了各种三,四和五取代的吡啶。