Microwave-Assisted Synthesis of 3,6-Di(pyridin-2-yl)pyridazines: Unexpected Ketone and Aldehyde Cycloadditions
作者:Richard Hoogenboom、Brian C. Moore、Ulrich S. Schubert
DOI:10.1021/jo060632p
日期:2006.6.1
3,6-Di(pyridin-2-yl)pyridazines are an interesting class of compounds because of their metal-coordinating ability resulting in the self-assembly into [2×2] gridlike metal complexes with copper(I) or silver(I) ions. These and other substituted pyridazines can be prepared by the inverse-electron-demand Diels−Alder reactions between acetylenes and 1,2,4,5-tetrazines. In this contribution, the effect of
3,6-二(吡啶-2-基)哒嗪是一类有趣的化合物,因为它们具有金属配位能力,可与铜(I)或银(I)自组装成[2×2]网格状金属配合物)离子。这些和其他取代的哒嗪可以通过乙炔与1,2,4,5-四嗪之间的反电子需求Diels-Alder反应制备。在这一贡献中,描述了(过热)微波条件对这些通常缓慢的环加成的影响。在甲苯或N,N回流几天后,可以加快乙炔向3,6-二(吡啶-2-基)-1,2,4,5-四嗪的环加成反应-二甲基甲酰胺在150°C的二氯甲烷中放置数小时。另外,详细描述了各种酮和醛的烯醇互变异构体与3,6-二(吡啶-2-基)-1,2,4,5-四嗪的意想不到的环加成反应,提供了合成(取代的)哒嗪。