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.
Visible-light-induced decarboxylative acylation of quinoxalin-2(1<i>H</i>)-ones with α-oxo carboxylic acids under metal-, strong oxidant- and external photocatalyst-free conditions
作者:Long-Yong Xie、You-Shu Bai、Xiang-Qin Xu、Xia Peng、Hai-Shan Tang、Ying Huang、Ying-Wu Lin、Zhong Cao、Wei-Min He
DOI:10.1039/c9gc03899j
日期:——
A mild and eco-friendly visible-light-induced decarboxylative acylation of quinoxalin-2(1H)-ones and α-oxo carboxylic acids with ambient air as the sole oxidant at room temperature was established. The reaction proceeded efficiently without any metal catalysts, strong oxidants or external-photosensitizers, ultimately reducing the generation of waste.
Unusual C<sub>3</sub>-acetylation of quinoxalin-2(1<i>H</i>)-one <i>via</i> oxidative C–C and C–O bond cleavages of PEG-400
作者:Vishal Suresh Kudale、Mohana Reddy Mutra、Ching-Piao Chu、Jeh-Jeng Wang
DOI:10.1039/d1ob00769f
日期:——
Aerobic oxidative tandem conversion of PEG-400 to acetyl radical via C–C and C–O bond cleavages followed by silver-catalyzed menisci-type addition to the C3 position of quinoxalin-2(1H)-one is described. This reaction involves the in situ formation of the acetyl radical from PEG-400 via a sequence of acetaldehyde, 2-oxopropanal and, 2-oxopropanoic acid formation and successive oxidative cleavage to
Photocatalytic Hydroacylation of Alkenes by Directly Using Acyl Oximes
作者:Lan Zheng、Peng-Ju Xia、Qing-Lan Zhao、Yu-En Qian、Wen-Nian Jiang、Hao-Yue Xiang、Hua Yang
DOI:10.1021/acs.joc.0c01818
日期:2020.9.18
are directly used as the acyl radical precursors in the hydroacylation reactions for the first time. In this work, acyl radicals can be effectively generated viaβ-scission of a phosphoranyl radical under photocatalytic conditions. As a result, the hydroacylation of alkenes triggered by the resulting acyl radicals leads to facile syntheses of a range of valuable ketones.
<i>t</i>
Bu
<sub>4</sub>
NCl/K
<sub>2</sub>
S
<sub>2</sub>
O
<sub>8</sub>
System Induced C‐2 Functionalization of 8‐Aminoquinoline Amides with Primary Alcohols
作者:Kaixin Zhang、Jianxiong Xu、Jinxiang Xiao、Ronglin Zhong、Jizhen Li
DOI:10.1002/ejoc.202201432
日期:2023.2.13
light-free Minisci-type C2−H functionalization approach including acylation and alkylation of 8-aminoquinoline amides with general primary alcohols was demonstrated under tBu4NCl/K2S2O8 system. The chlorine radical induced the original ketyl radical generation from alcohols, and the mechanism for the acylation reaction was investigated in detail.
在t Bu 4 NCl/K 2 S 2 O 8系统下展示了一种金属和无光 Minisci 型 C2−H 功能化方法,包括 8-氨基喹啉酰胺与一般伯醇的酰化和烷基化。氯自由基诱导醇产生原始的羰基自由基,并详细研究了酰化反应的机理。