Ruthenium catalysed denitrogenative transannulation of pyridotriazoles with naphthoquinones provided the transannulated benzo[f]pyrido[1,2-a]indoles derivatives in good to excellent yields. While pyridotriazoles with indoles in presence of PivOH and oxone yield indolizino[3,2-b]indoles under metal-free conditions. Quinone annulation proceeds through ruthenium-carbenoid intermediate while indole annulation
钌催化的
吡啶并三唑与
萘醌的脱氮环化提供了苯并[ f ]
吡啶并[1,2- a ]
吲哚衍
生物的良好到优异的产率。而在 PivOH 和 oxone 存在下,
吡啶并三唑与
吲哚一起在无
金属条件下产生
吲哚并 [3,2- b ]
吲哚。醌环化通过
钌-卡宾中间体进行,而
吲哚环化可以通过重氮-
吡啶鎓中间体进行。对照实验表明两种转化都遵循离子机制。