Expedient synthesis of pyrrolo[1,2-a]quinoxalines through one-pot three-component reactions of o-phenylenediamines, 2-alkoxy-2,3-dihydrofurans and ketones
作者:Man Wang、Changhui Liu、Yanlong Gu
DOI:10.1016/j.tet.2016.09.014
日期:2016.10
reaction of the dihydrofuran with o-phenylenediamine, which produced a N-(2-aminophenyl)pyrrole derivative that can act as a 1,5-bisnucleophile, and (ii) an intramolecular Mannich-type reaction of the bisnucleophile and ketone to produce the pyrrolo[1,2-a]quinoxaline derivative.
通过2-烷氧基-2,3-二氢呋喃,邻苯二胺和酮的三组分反应合成了吡咯并[1,2- a ]喹喔啉。通过使用三氟化硼醚化物作为催化剂在硝基甲烷中进行该反应。该反应的机理涉及以下两个步骤:(i)二氢呋喃与邻苯二胺的缩合反应,生成可充当1,5-双亲核试剂的N-(2-氨基苯基)吡咯衍生物,和(ii) )双亲核体和酮的分子内曼尼希型反应,生成吡咯并[1,2- a ]喹喔啉衍生物。