New applications of 1,1,1,3,3,3-hexafluoroisopropanol (HFIP) were reported in the copper-catalyzed chemoselective C–H hydroxyhexafluoroisobutylation and hexafluoroisopropoxylation of quinoxalin-2(1H)-ones.
C3-trifluoroethylation of quinoxalin-2-(1H)-ones has been developed using an inexpensive organic dye as a photocatalyst and commercially available 1,1,1-trifluoro-2-iodoethane as a trifluoroethyl radical source. This reaction has a wide range of applicability and mild reaction conditions, which provide a straightforward route in preparation of C3-trifluoroethylated quinoxalin-2-(1H)-ones.
使用廉价的有机染料作为光催化剂和市售的 1,1,1-三氟-2-碘乙烷作为三氟乙基自由基源,开发了可见光诱导的喹喔啉-2- (1 H )-酮的 C3-三氟乙基化. 该反应具有广泛的适用性和温和的反应条件,为制备C3-三氟乙基化喹喔啉-2-(1 H )-酮提供了一条简单的途径。
Transition-Metal-Free Decarboxylation of 3,3,3-Trifluoro-2,2-dimethylpropanoic Acid for the Preparation of C(CF<sub>3</sub>)Me<sub>2</sub>-Containing Heteroarenes
The direct synthesis of C(CF3)Me-2-substituted heteroarenes by decarboxylative 1,1-dimethyltrifluoroethylation of heteroarenes with 3,3,3-trifluoro-2,2-dimethylpropanoic acid is reported. This method does not need the transition-metal catalyst, and the base is crucial for this reaction. A series of previously unknown C(CF3)Me-2-containing heteroarenes were obtained in high yields and have potential applications in the drug discovery process.
Metal‐Free Direct Oxidative C−N Bond Coupling of Quinoxalin‐2(1
<i>H</i>
)‐ones with Azoles under Mild Conditions
Direct C3−H amination of quinoxalin‐2(1H)‐ones with azoles has been achieved in a very fast manner. This protocol features broad substrate scope, good yields, and mild reaction conditions.
Metal & Surfactant-Free oxidation of Quinoxalin-2(1H)-ones: Access to Quinoxaline-2,3-diones
作者:Xuan Li、Jiawang Zang、Shoucai Wang、Chen Kang、Jiawei Xu、Guangbin Jiang、Fanghua Ji
DOI:10.1016/j.tetlet.2022.153916
日期:2022.7
practical method features transition metal free, surfactant free, chromatography free, mild reaction conditions, good functional group tolerance and easy scale-up synthesis. Furthermore, it provided a convenient approach for the synthesis of one kind of known inhibitor for α-glucosidase. This mechanistic study shows that this transformation is not a radical process.