Visible‐Light‐Induced Direct C−H Amination of Quinoxalin‐2(1
H
)‐ones
摘要:
AbstractA visible‐light‐induced direct C(sp2)−H amination of quinoxalin‐2(1H)‐ones toward the synthesis of substituted 3‐aminoquinoxalin‐2(1H)‐ones with TMSN3 has been firstly developed. This transformation achieved C(sp2)−H/N−H coupling in the absence of external ligand and oxidant. Notably, this methodology features mild reaction conditions, broad substrate scope and operational simplicity.magnified image
Allylboronic Esters as Acceptors in Radical Addition, Boron 1,2-Migration, and Trapping Cascades
作者:Kalipada Jana、Armido Studer
DOI:10.1021/acs.orglett.2c00039
日期:2022.2.4
Radical 1,3-carboheteroarylation and 1,3-hydroalkylation of allylboronic esters comprising a 1,2-boron shift is reported. Allylboronic esters are generally used in synthesis as allylation reagents, where the boronic ester moiety gets lost. In the introduced cascades, alkylboronic esters are obtained with the boron entity remaining in the product. The carboheteroarylation of the allylboronic esters
sulfonates toward sulfone derivatives has been developed under environmentally friendly conditions. This strategy represents an efficient and practical difunctionalization of olefins using water/aqueousmedia as a sustainable solvent. In addition, this transition metal-free reaction is high yield, and operationally simple, and in particular, proceeds under mild conditions to afford desired sulfones with high
在环境友好的条件下,开发了一种烯烃与喹喔啉-2(1 H )-酮和磺酸钠直接双官能化制备砜衍生物的方法。该策略代表了使用水/水介质作为可持续溶剂对烯烃进行有效且实用的双功能化。此外,这种不含过渡金属的反应收率高,操作简单,特别是在温和条件下进行,得到具有高官能团相容性的所需砜。
Electrochemically dehydrogenative C–H/P–H cross-coupling: effective synthesis of phosphonated quinoxalin-2(1<i>H</i>)-ones and xanthenes
作者:Ke-Jing Li、Yang-Ye Jiang、Kun Xu、Cheng-Chu Zeng、Bao-Guo Sun
DOI:10.1039/c9gc01474h
日期:——
phosphonation of quinoxalin-2(1H)-ones and C(sp3)–H phosphonation of xanthenes has been developed. The chemistry was performed in an undivided cell under constant current conditions and features a wide range of substrates, up to 99% yield and it is free of transition-metal catalysts- and external oxidants, thereby providing a straightforward approach for dehydrogenativeC–H/P–H cross-coupling. In addition
已开发出一种有效的电化学方法,用于喹喔啉-2(1 H)-酮的C(sp 2)-H磷酸化和x吨的C(sp 3)-H磷酸化。该化学反应是在恒定电流条件下在一个未分开的电池中进行的,具有多种底物,产率高达99%,并且不含过渡金属催化剂和外部氧化剂,从而为CH / H /脱氢提供了直接的方法P–H交叉耦合。另外,对照实验表明,某些反应可能涉及自由基途径。
Graphene oxide-catalyzed trifluoromethylation of alkynes with quinoxalinones and Langlois' reagent
作者:Hong Li、Xiangjun Peng、Liang Nie、Lin Zhou、Ming Yang、Fan Li、Jian Hu、Zhiyang Yao、Liangxian Liu
DOI:10.1039/d1ra07014b
日期:——
The direct C–H trifluoromethylation of alkynes and quinoxalinones has been achieved using a graphene oxide/Langlois' reagent system. This multi-component tandem reaction using graphene oxide as the catalyst and Langlois' reagent as the robust CF3 radical source results in the formation of olefinic C–CF3 to access a series of 3-trifluoroalkylated quinoxalin-2(1H)-ones.
Copper-Catalyzed Direct Carbamoylation of Quinoxalin-2(1<i>H</i>
)-ones with Hydrazinecarboxamides Under Mild Conditions
作者:Xianglong Chu、Yujuan Wu、Haigen Lu、Bingchuan Yang、Chen Ma
DOI:10.1002/ejoc.201901858
日期:2020.3.8
An efficient and simple method for the synthesis of 3‐carbamoylated quinoxalin‐2(1H)‐ones base on copper‐catalyzed directcarbamoylation of quinoxalin‐2(1H)‐ones at C3 position has been reported, This process provides a series of 3‐carbamoylquinoxalin‐2(1H)‐one derivatives in moderate to good yields under mild conditions with good functional group tolerance. This work provides a novel and efficient