廉价的三水合硫化钠被发现可以促进邻硝基苯胺与α-四氢萘酮前所未有的6e-区域预定义氧化还原缩合生成苯并[ a ]吩嗪。该方法还成功扩展到苯乙酮和高级同系物作为还原伙伴,以提供 2-苯基喹喔啉。与从邻苯二胺开始的苯并[ a ]吩嗪和喹喔啉核心的传统方法相比,本策略可以基于起始邻硝基苯胺的结构为这些杂环提供明确的区域化学。
A gold-catalyzedoxidation of arylallenes to form alpha-diketones and aldehydes in good yields is presented. Further directed synthesis of quinoxalines and benzimidazoles, via the condensation of the resulting alpha-diketones and aldehydes with benzene-1,2-diamine, was achieved in high yields.