28082-82-8Relevant academic research and scientific papers
A bis(η5-cyclopentadienyl)cobalt complex of a bis-dithiolene: A chemical analogue of the metal centres of the DMSO reductase family of molybdenum and tungsten enzymes, in particular ferredoxin aldehyde oxidoreductase
Alphonse, France-Aimée,Karim, Rehana,Cano-Soumillac, Céline,Hebray, Marielle,Collison, David,Garner, C. David,Joule, John A.
, p. 11010 - 11019 (2005)
The synthesis is described of a bis-ene-1,2-dithiolate pro-ligand, designed to model the stereochemical situation in the cofactor of the tungsten enzyme ferredoxin aldehyde oxidoreductase from Pyrococcus furiosus. Each masked ene-1,2-dithiolate unit is mounted on a pyrano[2,3-b]tetrahydroquinoxaline tricycle, comparable to the pyrano[2,3-g]tetrahydropteridines found in all molybdoenzymes and tungsten analogues. Hydrolytic release of the bis-ligand was confirmed by its entrapment as a double (η5-C5H 5)Co complex.
Electro-reductive C-H cyanoalkylation of quinoxalin-2(1H)-ones
Ding, Ling,Liu, Yuxiu,Niu, Kaikai,Wang, Qingmin
supporting information, (2022/01/24)
Herein, we report a practical electro-reductive protocol for the direct C–H cyanoalkylation of quinoxalin-2(1H)-ones via iminyl radical-mediated ring opening. These mild reactions proceed under metal-, reductant-, and reagent-free conditions to provide synthetically useful cyanoalkylated quinoxalin-2(1H)-ones.
Copper-Catalyzed Divergent C-H Functionalization Reaction of Quinoxalin-2(1H)-ones and Alkynes Controlled by N1-Substituents for the Synthesis of (Z)-Enaminones and Furo[2,3-b]quinoxalines
Feng, Qiong,He, Meiqin,Huang, Huabin,Ji, Fanghua,Jiang, Guangbin,Li, Xuan,Nie, Hongsheng,Wang, Shoucai,Xiong, Zhicheng,Yang, Guang
supporting information, p. 1859 - 1864 (2022/03/16)
With control by N1-substituents, the switchable divergent C-H functionalization reaction of quinoxalin-2(1H)-ones is achieved for the synthesis of (Z)-enaminones and furo[2,3-b]quinoxalines using the combination of a copper catalyst and an oxidant. This new protocol features mild reaction conditions, readily available materials, and a broad substrate scope. Gram-scale and mechanistic studies were also investigated. Furthermore, the desired products exhibited excellent antitumor activity against A549, HepG-2, MCF-7, and HeLa cells, which were tested by MTT assay.
Electro-oxidative C-H alkylation of quinoxalin-2(1: H)-ones with organoboron compounds
Niu, Kaikai,Hao, Yanke,Song, Lingyun,Liu, Yuxiu,Wang, Qingmin
supporting information, p. 302 - 306 (2021/01/28)
Radical cleavage of C-B bonds to accomplish C-H functionalization is synthetically appealing but practically challenging. We report herein a mild electro-oxidative method for efficient C-H alkylation of quinoxalin-2(1H)-ones by means of radical addition reactions of alkyl boronic acids and esters and alkyl trifluoroborates to afford C-C coupled products. This journal is
Electro-oxidative C-H azolation of quinoxalin-2(1H)-ones
Ding, Ling,Hao, Yanke,Liu, Yuxiu,Niu, Kaikai,Song, Hongjian,Wang, Qingmin,Zhou, Pan
supporting information, p. 3246 - 3249 (2021/05/21)
We have developed a practical, general protocol for direct C-H azolation reactions of quinoxalin-2(1H)-ones by electro-oxidative cross-coupling. These mild reactions proceed under metal-, oxidant-, and reagent-free conditions to provide synthetically useful azolated quinoxalin-2(1H)-ones. Furthermore, the reactions can be carried out with a pencil lead as an electrode and a 3 V battery as a power source, revealing the remarkable flexibility of this protocol.
Electrochemical chlorination and bromination of electron-deficient C[sbnd]H bonds in quinones, coumarins, quinoxalines and 1,3-diketones
Yu, Dan,Ji, Ruixue,Sun, Zhihui,Li, Wenjie,Liu, Zhong-Quan
supporting information, (2021/11/16)
The electrochemistry-promoted chlorination and bromination of electron-deficient C[sbnd]H bonds was developed, using quinones, coumarins, quinoxalines and 1,3-diketones. This protocol features readily available and safe halogen sources (hydrochloric acid and KBr), high site-selectivity and mild reaction conditions. It could provide an efficient access to a series of chlorinated and brominated quinones, coumarins, quinoxalines and 1,3-diketones.
Synthesis of (E)-Quinoxalinone Oximes through a Multicomponent Reaction under Mild Conditions
Xu, Jun,Yang, Huiyong,He, Lei,Huang, Lin,Shen, Jiabin,Li, Wanmei,Zhang, Pengfei
supporting information, p. 195 - 201 (2021/01/13)
Herein, a novel method for the gram-scale synthesis of (E)-quinoxalinone oximes through a multicomponent reaction under mild conditions is described. Such a transformation was performed under transition-metal-free conditions, affording (E)-oximes in a moderate-to-good yield through recrystallization. Our methodology demonstrates a successful combination of a Mannich-type reaction and radical coupling, providing a green and practical approach for the synthesis of potentially bioactive quinoxalinone-containing molecules.
K2S2O8-catalyzed highly regioselective amidoalkylation of diverse N-heteroaromatics in water under visible light irradiation
Chen, Zhi,Li, Jianjun,Ren, Quanlei,Song, Shengjie,Wang, Chaodong,Xu, Ning,Zhou, Jiadi
supporting information, p. 5753 - 5758 (2021/08/23)
A K2S2O8-catalyzed versatile C(sp2)-C(sp3) bond formation with N-heteroaromatics and γ-lactams/amides was developed. Quinoxalin-2(1H)-one, quinoline, isoquinoline, phthalazine, and benzothiazole reacted with γ-lactams/amides to give the corresponding C(sp2)-H amidoalkylation products in moderate to good yields with high regioselectivity. This visible-light-induced photocatalyst-free reaction was conducted in H2O at ambient temperature, which comply with the principles of "green chemistry". The new K2S2O8 catalytic mechanism was investigated with control experiments.
Visible-Light-Promoted Switchable Synthesis of C-3-Functionalized Quinoxalin-2(1H)-ones
Aganda, Kim Christopher C.,Hong, Boseok,Lee, Anna
supporting information, p. 1443 - 1448 (2021/01/26)
A visible-light-promoted synthesis of quinoxalin-2(1H)-ones has been developed using 9-mesityl-10-methylacridinium perchlorate as an organo-photocatalyst. The atmosphere-controlled method (Ar/air) enabled the selective synthesis of hydroxyl- and acyl-containing quinoxalin-2(1H)-ones under mild reaction conditions without the use of any metal catalysts or toxic reagents. A fluorescent labelling experiment showed that hydroxyl-containing quinoxalin-2(1H)-ones may have utility in various biological applications as potent fluorophores. (Figure presented.).
PIDA-induced oxidative C–N bond coupling of quinoxalinones and azoles
Wimonsong, Watchara,Yotphan, Sirilata
supporting information, (2021/01/25)
A metal-free promoted direct oxidative C–N bond coupling of quinoxalinones and azoles for the rapid and effective synthesis of potent pharmaceutical important 3-(azol-1-yl)quinoxalin-2-one has been developed. Employing PIDA as the easily available mediator, the desired coupling products were isolated in moderate to excellent yields with a good substrate scope under operational simplicity and mild reaction conditions. Preliminary mechanistic studies suggested that a radical process is likely to be involved in the reaction.
