Regioselective Brønsted Acid-Catalyzed Annulation of Cyclopropane Aldehydes with <i>N</i>′-Aryl Anthranil Hydrazides: Domino Construction of Tetrahydropyrrolo[1,2-<i>a</i>]quinazolin-5(1<i>H</i>)ones
作者:Priyanka Singh、Navpreet Kaur、Prabal Banerjee
DOI:10.1021/acs.joc.9b03170
日期:2020.3.6
synthesis of tetrahydropyrrolo[1,2-a]quinazolin-5(1H)one derivatives was achieved by reacting cyclopropane aldehydes with N'-aryl anthranil hydrazides in the presence of p-toluene sulfonic acid (PTSA). The transformation involves domino imine formation and intramolecular cyclization to form 2-arylcyclopropyl-2,3-dihydroquinolin-4(1H)-one, followed by nucleophilic ring opening of the cyclopropyl ring to form
在对甲苯磺酸(PTSA)存在下,通过使环丙烷醛与N'-芳基邻氨基苯甲酰肼反应,可以实现对四氢吡咯并[1,2-a]喹唑啉-5(1H)酮衍生物的高度区域选择性合成。该转化涉及多米诺亚胺的形成和分子内环化以形成2-芳基环丙基-2,3-二氢喹啉-4(1H)-一个,然后环丙基环的亲核开环形成所需的四氢吡咯并[1,2-a]喹唑啉- 5(1H)1具有良好的收率,并且具有完全的区域选择性。该方案可耐受多种官能团,因此为吡咯并喹唑啉酮的合成提供了一种简单而高效的方法。