Microwave-Promoted Syntheses of Quinazolines and Dihydroquinazolines from 2-Aminoarylalkanone <i>O</i>-Phenyl Oximes
作者:Fernando Portela-Cubillo、Jackie S. Scott、John C. Walton
DOI:10.1021/jo900629g
日期:2009.7.17
was included in the reaction mixture, fully aromatic quinazolines were produced in high yields by a rapid and convenient process. The method worked well with alkyl, aryl, and heterocyclic aldehydes and for a variety of substituents in the benzenic part of the molecule. Similar reactions employing ketones instead of aldehydes were less efficient. Although some dihydroquinazolines did form, they were accompanied
各种各样的生物活性化合物都包含喹唑啉环系统。描述了一种新的基于自由基的制备官能化喹唑啉的方法,该方法依赖于微波促进的O-苯基肟与醛的反应。制备了少量的2-氨基芳基烷酮O-苯基肟,并显示出与醛在甲苯中混合并进行微波加热时会产生二氢喹唑啉。当ZnCl 2通过在反应混合物中加入芳族喹啉,可以通过快速方便的方法以高收率生产出完全芳族的喹唑啉。该方法与烷基,芳基和杂环醛以及分子的苯部分中的各种取代基配合使用效果很好。采用酮代替醛的类似反应效率较低。尽管确实形成了一些二氢喹唑啉,但它们伴随着几种副产物。令人惊讶地,在每种情况下,副产物之一是喹啉衍生物,并且提出了一种合理的机制来解释这种重排。