Domino reactions of 2<i>H</i>-azirines with acylketenes from furan-2,3-diones: Competition between the formation of <i>ortho</i>-fused and bridged heterocyclic systems
作者:Alexander F Khlebnikov、Mikhail S Novikov、Viktoriia V Pakalnis、Roman O Iakovenko、Dmitry S Yufit
DOI:10.3762/bjoc.10.74
日期:——
prepared only from 3-aryl-2H-azirines having no electron-withdrawing groups in the aryl substituent. Calculations at the DFT B3LYP/6-31G(d) level for the various routes of bis[1,3]oxazino[3,2-a:3',2'-d]pyrazine skeleton formation revealed a new domino reaction of 3-aryl-2H-azirines occurring in the presence of furandiones: acid-catalyzed dimerization to dihydropyrazine followed by consecutive cycloaddition
3-芳基-2H-氮丙啶与通过 5-芳基呋喃-2,3-二酮热解产生的酰基乙烯酮反应,得到桥联 5,7-二氧杂-1-氮杂双环[4.4.1]undeca-3,8-二烯- 2,10-二酮和/或邻位稠合的6,6a,12,12a-四氢双[1,3]恶嗪基[3,2-a:3',2'-d]吡嗪-4,10-二酮。后者具有新的杂环骨架,是两分子氮丙啶和两分子酰基乙烯酮偶联的结果,并且只能由芳基取代基中不具有吸电子基团的3-芳基-2H-氮丙啶制备。在 DFT B3LYP/6-31G(d) 水平上对双[1,3]恶嗪基[3,2-a:3',2'-d]吡嗪骨架形成的各种途径的计算揭示了新的多米诺骨牌反应 3 -芳基-2H-氮丙啶在呋喃二酮存在下发生:酸催化二聚成二氢吡嗪,然后将后者连续环加成到两个酰基乙烯酮分子上。