The synthesis of 2-amino-4(3H)-quinazolinones and related heterocycles via a mild electrocyclization of aryl guanidines
作者:Zachary S. Sales、Neelakandha S. Mani、Brett D. Allison
DOI:10.1016/j.tetlet.2018.03.034
日期:2018.4
A new method for the preparation of 2-amino-4(3H)-quinazolinones and similar fused heterocycles is described. Simply warming a mixture of an aryl guanidine and carbonyl diimidazole in acetonitrile results in formation of a putative N-amidinoisocyanate intermediate which undergoes a 6π-electron electrocyclic reaction with the aryl ring to generate the quinazolinone ring system. The mild conditions are
描述了一种制备2-氨基-4(3H)-喹唑啉酮和类似的稠合杂环的新方法。简单地加热芳基胍和羰基二咪唑在乙腈中的混合物,将导致推定的N -ami基异氰酸酯中间体的形成,该中间体与芳基环进行6π电子环化反应以生成喹唑啉酮环系。温和的条件与各种官能团均相容,并且该反应在多克级上显示为成功的。