Transannulation of Pyridotriazoles with Naphthoquinones and Indoles: Synthesis of Benzo[
<i>f</i>
]Pyrido[1,2‐
<i>a</i>
]Indoles and Indolizino[3,2‐
<i>b</i>
]indoles
作者:Deepa Rawat、Subbarayappa Adimurthy
DOI:10.1002/adsc.202100965
日期:2022.1.4
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。