Results 271 to 280 of about 26,379 (326)

Synthesis of Pyrazolo[1,5-a]quinoxalines

Synthesis, 1996
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
BROGGINI, GIANLUIGI, Garanti L., Molteni G., ZECCHI, GAETANO ALDO   +3 more
openaire   +5 more sources

Novel and selective TLR7 antagonists among the imidazo[1,2-a]pyrazines, imidazo[1,5-a]quinoxalines and pyrazolo[1,5-a]quinoxalines series.

Journal of Medicinal Chemistry, 2019
The Toll-like receptors (TLRs) 7 and 8 play an important role in the immune system activation, and their agonists may therefore serve as promising candidate vaccine adjuvants.
Nour Bou Karroum, Georges Moarbess, J. Guichou, P. Bonnet, C. Patinote, H. Bouharoun-Tayoun, S. Chamat, P. Cuq, M. Diab‐Assaf, I. Kassab, C. Deleuze-Masquéfa   +10 more
semanticscholar   +1 more source

Polymers with quinoxaline units. V. Polymers with quinoxaline and dioxin units

Journal of Polymer Science Part A-1: Polymer Chemistry, 1969
AbstractLadder or partly ladder polymers have been prepared by condensation of tetraphenols with tetrachloroquinoxaline compounds in melt, or in pyridine, naphthalene, and nitrobenzene reaction media. The polymers are dark‐colored, powdery materials with good thermal stability. Some of the samples are slightly soluble in sulfuric acid, while others are
Carl S. Marvel, Rainer Wolf
openaire   +2 more sources

Oxidative Synthesis of Benzimidazoles, Quinoxalines, and Benzoxazoles from Primary Amines by ortho-Quinone Catalysis.

Organic Letters, 2017
The bioinspired ortho-quinone catalysts have been applied to heterocycles synthesis. Without any metal cocatalysts, a sole ortho-quinone catalyst enables the oxidative synthesis of benzimidazoles, quinoxalines and benzoxazoles from primary amines in high
Ruipu Zhang, Yan Qin, Long Zhang, S. Luo
semanticscholar   +1 more source

Quinoxaline Macrocycles

2014
Macrocyclic cоmpounds are some of the most interesting objects in modern synthetic chemistry and, as shown in this critical review, they provide an attractive entry into quinoxaline derivatives, which are very important heterocycles from many points of view including medicinal and pharmaceutical chemistry and material sciences.
Alexey A. Kalinin, Vakhid A. Mamedov
openaire   +2 more sources

Metal-Free Synthesis of Pyrrolo[1,2-a]quinoxalines Mediated by TEMPO Oxoammonium Salts

Synthesis, 2018
We herein describe a novel TEMPO oxoammonium salt initiated Pictet–Spengler reaction of imines, generated in situ from carbonyl compounds and pyrrole- or indole-containing substrates, to afford 4,5-dihydropyrrolo[1,2-a]quinoxalines or 5,6-dihydroindolo[1,
Xiangying Tang, Y. Gong, Hengrui Huo
semanticscholar   +1 more source

Ball-milling synthesized hydrotalcite supported Cu-Mn mixed oxide under solvent-free conditions: an active catalyst for aerobic oxidative synthesis of 2-acylbenzothiazoles and quinoxalines

, 2018
A rapid solvent-free ball-milling method was developed to prepare a hydrophobic hydrotalcite supported Cu–Mn mixed oxide catalyst (Cu–Mn/HT). The mechanochemically prepared catalyst exhibited high catalytic activity and recyclability towards the aerobic ...
Xu Meng, Xiuru Bi, Chaoying Yu, Ge-xin Chen, Baohua Chen, Zhenqiang Jing, Pei-qing Zhao   +6 more
semanticscholar   +1 more source

Halogen-Bond-Promoted Double Radical Isocyanide Insertion under Visible-Light Irradiation: Synthesis of 2-Fluoroalkylated Quinoxalines.

Organic Letters, 2016
A halogen-bond-promoted double radical isocyanide insertion with perfluoroalkyl iodides is reported. With perfluoroalkyl iodides as halogen-bond donors and organic bases as halogen-bond acceptors, fluoroalkyl radicals can be generated by a visible-light ...
Xiaoyang Sun, Wenmin Wang, Yanle Li, Jing Ma, Shouyun Yu   +4 more
semanticscholar   +1 more source

Quinoxaline-Based Cyclo(oligophenylenes) [PDF]

The Journal of Organic Chemistry, 2015
A series of fully conjugated quinoxaline-based oligophenylene macrocycles is synthesized by Ni(0)-mediated Yamamoto-type diaryl homocoupling of (fluorinated) 2,3-bis(4'-bromophenyl)quinoxaline precursors. Cyclotrimers and cyclotetramers are obtained as the dominant reaction products.
Wouter Maes, Wouter Maes, Dirk Vanderzande, Dirk Vanderzande, Julija Kudrjasova, Julija Kudrjasova, Laurence Lutsen, Laurence Lutsen, Lidia Marin, Pieter Verstappen, Pieter Verstappen, Huguette Penxten, Huguette Penxten, Koen Robeyns   +13 more
openaire   +2 more sources

Copper-catalyzed tandem aerobic oxidative cyclization for the synthesis of 4-cyanoalkylpyrrolo[1,2-a]quinoxalines from 1-(2-aminophenyl)pyrroles and cyclobutanone oxime esters.

Chemical Communications, 2018
A copper-catalyzed tandem ring-opening/cyclization reaction for the synthesis of 4-cyanoalkylpyrrolo[1,2-a]quinoxalines from 1-(2-aminophenyl)pyrroles and cyclobutanone oxime esters has been developed. This reaction involves C-C bond cleavage and C-C and
Zhenyu An, Yong Jiang, X. Guan, Rulong Yan   +3 more
semanticscholar   +1 more source