234-95-7Relevant academic research and scientific papers
A Green Aerobic Oxidative Synthesis of Pyrrolo[1,2-a]quinoxalines from Simple Alcohols without Metals and Additives
Li, Jixing,Zhang, Jinlong,Yang, Huameng,Gao, Zeng,Jiang, Gaoxi
, p. 765 - 769 (2017)
A practical and concise protocol for the efficient preparation of pyrrolo[1,2-a]quinoxalines through a cascade of alcohol oxidation/imine formation/intramolecular cyclization/oxidative dehydrogenation has been established. A series of substituted pyrrolo[1,2-a]quinoxaline derivatives were constructed readily in yields of 53-93% from the cheap primary alcohols by using dioxygen as the terminal oxidant. Remarkably, the fact that no extra metals and additives were necessary makes this unprecedented aerobic oxidation process highly step- and atom-economical. The usefulness of this transformation was further demonstrated with the gram-scale synthesis of compound 3aa under standard conditions.
Transition-metal-free N-arylation: A general approach to aza-fused poly-heteroaromatics
Annareddygari, Srikanth,Kasireddy, Venkateshwer Reddy,Reddy, Jayachandra
, p. 3267 - 3276 (2019)
A new and efficient method for the synthesis of various aza-fused poly-hetero aromatics has been described. This protocol includes an intermolecular condensation followed by metal-free base-promoted intramolecular C―N coupling reaction. The advantage of this one-pot transformation lies in the use of simple cyclic amidines-like compounds without prefunctionalization of the starting heterocycles.
Efficient copper-catalyzed annulation of 2-formylazoles with 2-haloanilines for the synthesis of pyrrole- and imidazole-fused quinoxalines
Li, Zihao,Yan, Nannan,Xie, Jianwei,Liu, Ping,Zhang, Jie,Dai, Bin
, p. 589 - 593 (2015)
Promoted by CuI/2-hydroxybenzohydrazide catalytic system, a variety of pyrrole- and imidazole-fused quinoxalines have been efficiently one-pot synthesized from pyrrole-/imidazole-2-carboxaldehyde and 2-haloanilines in moderate to excellent yields. 2-Hydroxybenzohydrazide-promoted CuI-catalyzed one-pot annulation of pyrrole-/imidazole-2-carboxaldehyde with 2-haloanilines for the synthesis of pyrrolo[1,2-α]- and imidazo[1,2-α]quinoxalines under relatively mild conditions is described.
PEG-400 as a carbon synthon: Highly selective synthesis of quinolines and methylquinolines under metal-free conditions
Ding, Chengcheng,Feng, Kaili,Li, Shichen,Ma, Chen
, p. 5542 - 5548 (2021/08/16)
A metal-free, peroxide-free, and efficient procedure for the highly selective synthesis of quinolines and methylquinolines was reported. The main feature of this method was that the same substrate can produce quinolines and methylquinolines, respectively, under different reaction conditions. PEG-400 was used as both a reactant and solvent in this reaction. The utility of the designed procedure was also demonstrated by the derivatization of the products to bioactive compounds. This journal is
N,N-Dimethylformamide as Carbon Synthons for the Synthesis ofN-Heterocycles: Pyrrolo/Indolo[1,2-a]quinoxalines and Quinazolin-4-ones
Ding, Chengcheng,Li, Shichen,Ma, Chen,Ren, Jianing,Wang, Yishou
, p. 16848 - 16857 (2021/12/06)
N,N-dimethylformamide (DMF) as synthetic precursors contributing especially the methyl, acyl, and amino groups has played a significant role in heterocycle syntheses and functionalization. In this protocol, a wide range of pyrrolo/indolo[1,2-a]quinoxalines and quinazolin-4-ones were obtained in moderate to good yields by using elemental iodine without any metal or peroxides. We considered thatN-methyl andN-acyl of DMF participate and complete the reaction separately through different mechanisms, which displayed potential still to be explored of DMF.
Synthesis method of pyrrole[1,2-a]quinoxaline derivative
-
Paragraph 0055-0058, (2021/03/11)
The invention relates to a synthesis method of a pyrrole [1,2a] quinoxaline derivative. The method comprises the steps: dissolving a cuprous complex, 2-bromoaniline, a pyrrole formaldehyde compound and an alkali in an organic solvent, carrying out a reaction, and carrying out separation and purification to obtain the pyrrole[1,2a] quinoxaline derivative, wherein the molar ratio of the cuprous complex to the 2-bromoaniline to the pyrrole formaldehyde compound to the alkali is (0.01-0.03): 1.0: 1.0: 1.5, the reaction temperature is 50-65 DEG C, and the reaction time is 6-8 hours. Compared with the prior art, the method has the advantages of mild reaction conditions, high yield, high substrate universality, less waste and the like.
α-Hydroxy acid as an aldehyde surrogate: metal-free synthesis of pyrrolo[1,2-a]quinoxalines, quinazolinones, and other N-heterocyclesviadecarboxylative oxidative annulation reaction
Jung, Chanhyun,Jung, Jae-Kyung,Lee, Heesoon,Lee, Kiho,Lee, Seohu,Park, Yunjeong,Sim, Jaeuk,Viji, Mayavan,Vishwanath, Manjunatha
, p. 37202 - 37208 (2020/10/28)
A metal-free and efficient procedure for the synthesis of pyrrolo[1,2-a]quinoxalines, quinazolinones, and indolo[1,2-a]quinoxaline has been developed. The key features of our method include thein situgeneration of aldehyde from α-hydroxy acid in the presence of TBHP (tert-butyl hydrogen peroxide), and further condensation with various amines, followed by intramolecular cyclization and subsequent oxidation to afford the corresponding quinoxalines, quinazolinones derivatives in moderate to high yields.
Pyrrolo[1,2-a]quinoxalines: Insulin Mimetics that Exhibit Potent and Selective Inhibition against Protein Tyrosine Phosphatase 1B
García-Marín, Javier,Griera, Mercedes,Sánchez-Alonso, Patricia,Di Geronimo, Bruno,Mendicuti, Francisco,Rodríguez-Puyol, Manuel,Alajarín, Ramón,de Pascual-Teresa, Beatriz,Vaquero, Juan J.,Rodríguez-Puyol, Diego
, p. 1788 - 1801 (2020/09/15)
PTP1B dephosphorylates insulin receptor and substrates to modulate glucose metabolism. This enzyme is a validated therapeutic target for type 2 diabetes, but no current drug candidates have completed clinical trials. Pyrrolo[1,2-a]quinoxalines substituted at positions C1–C4 and/or C7–C8 were found to be nontoxic to cells and good inhibitors in the low- to sub-micromolar range, with the 4-benzyl derivative being the most potent inhibitor (0.24 μm). Some analogues bearing chlorine atoms at C7 and/or C8 kept potency and showed good selectivity compared to TCPTP (selectivity index '40). The most potent inhibitors behaved as insulin mimetics by increasing glucose uptake. The 4-benzyl derivative inhibited insulin receptor substrate 1 and AKT phosphorylation. Molecular docking and molecular dynamics simulations supported a putative binding mode for these compounds to the allosteric α3/α6/α7 pocket, but inconsistent results in enzyme inhibition kinetics were obtained due to the high tendency of these inhibitors to form stable aggregates. Computational calculations supported the druggability of inhibitors.
Terminal methyl as a one-carbon synthon: Synthesis of quinoxaline derivatives: Via radical-type transformation
Wang, Xinfeng,Liu, Huanhuan,Xie, Caixia,Zhou, Feiyu,Ma, Chen
, p. 2465 - 2470 (2020/02/20)
An iron-promoted method for the construction of pyrrolo[1,2-a]quinoxaline derivatives has been developed. Ferric chloride served as a promoter and as a Lewis acid in the reaction. Solvents provided the corresponding carbon sources simultaneously. The majority of solvents with terminal methyl groups, including ethers, amines and dimethyl sulfoxide, were reactive in the synthesis of quinoxaline derivatives at a certain yield via C-H(sp3) amination/C-O or C-N (C-S) cleavage. This method was applicable to a wide range of pyrrolo[1,2-a]quinoxaline and indolo[1,2-a]quinazoline substrates.
Unexpected activated carbon-catalyzed pyrrolo[1,2-a]quinoxalines synthesis in water
Sun, Qi,Liu, Liyan,Yang, Yu,Zha, Zhenggen,Wang, Zhiyong
, p. 1379 - 1382 (2019/05/04)
An interesting and recyclable activated carbon/water catalytic system for efficient synthesis of pyrrolo[1,2-a]quinoxaline derivatives was developed. The intramolecular C–N and C–C bond can be easily constructed in water under mild condition. This reaction features a broad substrate scope, a good tolerance to water and air, metal-free, additive-free and redox reagent-free.
