Metal‐Free Tandem One‐Pot Construction of 3,3‐Disubsituted 3,4‐Dihydroquinoxalin‐2(1
<i>H</i>
)‐Ones under Visible‐Light Photoredox Catalysis
作者:Zhen Yao、Zhenli Luo、Yixiao Pan、Xin Zhang、Bohan Li、Lijin Xu、Peng Wang、Qian Shi
DOI:10.1002/adsc.202101215
日期:2022.2
AbstractVisible‐light photoredox‐catalyzed metal‐free tandem one‐pot synthesis of 3,3‐disubstituted 3,4‐dihydroquinoxalin‐2(1H)‐ones from easily accessible 1,2‐diaminobenzenes, α‐ketoesters and 4‐alkyl Hantzsch esters has been described. This mild transformation affords the desired products in 47–93% yields for diversely decorated substrates, and can proceed on a gram‐scale. The efficacy of the current catalysis arises from the use of organic 1,2,3,5‐tetrakis(carbazol‐9‐yl)‐4,6‐dicyanobenzene (4CzIPN) as the photocatalyst and CF3CO2H as the additive.magnified image