Photoredox Catalyst Free, Visible Light‐Promoted C3−H Acylation of Quinoxalin‐2(1
<i>H</i>
)‐ones in Water
作者:Juan Lu、Xiang‐Kui He、Xiao Cheng、Ai‐Jun Zhang、Guo‐Yong Xu、Jun Xuan
DOI:10.1002/adsc.202000116
日期:2020.5.26
A method for the synthesis of 3‐acyl quinoxalin‐2(1H )‐ones through visible‐lightpromoteddecarboxylative acylation of α‐oxo‐carboxylicacids with quinoxalin‐2(1H )‐ones was developed. The reaction was performed in aqueous phase and photoredox catalyst was not required to run the process.
一种用于3-酰基喹喔啉-2(1的合成方法ħ) -酮通过可见光促进脱羧的α氧代羧酸酰化与喹喔啉-2(1 H ^) -酮被开发。反应在水相中进行,并且不需要光氧化还原催化剂来进行该过程。
Metal-free oxidative coupling of quinoxalin-2(1<i>H</i>)-ones with arylaldehydes leading to 3-acylated quinoxalin-2(1<i>H</i>)-ones
A facile TBHP-mediated direct oxidative coupling of quinoxalin-2(1H)-ones with arylaldehydes has been developed under metal-free conditions. This method provided a convenient and efficient approach to various 3-acylated quinoxalin-2(1H)-ones from readily available starting materials with excellent regioselectivity. This reaction proceeded efficiently under mild conditions over a broad range of substrates
selective C3-H acylation of quinoxalin-2(1H)-ones has been developed in a green and sustainable manner. In contrast to the conventional anionic eosin Y-based photoredox process, neutral eosin Y acts as the actual catalyst, which was responsible for the hydrogen-atom transfer (HAT) process to generate the acyl radical with readily available aldehydes as the radicalprecursor.
Silver-catalyzed decarboxylative acylation of quinoxalin-2(1H)-ones with α-oxo-carboxylic acids
作者:Xiaobao Zeng、Chulong Liu、Xingyong Wang、Jianlan Zhang、Xinyan Wang、Yuefei Hu
DOI:10.1039/c7ob02187a
日期:——
C–H bond acylation of quinoxalin-2(1H)-ones. In this method, α-oxo-carboxylic acids served as efficient acylatingreagents to in situ generate the required active acyl radical. Its excellent chemoselectivity allowed the molecular diversity of 3-acyl quinoxalin-2(1H)-ones to be achieved by convenient functionalizations of both N1- and C3-positions.