Results 71 to 80 of about 25,177 (318)
An efficient synthesis of quinoxalines catalyzed by monoammonium salt of 12-tungstophosphoric acid [PDF]
, 2011 Monoammonium salt of 12-tungstophosphoric acid [(NH4)H2PW12O40] catalyst was used for the synthesis of biologically important quinoxaline derivatives in excellent yields from various aromatic 1,2-dicarbonyl and 1,2-diamines.
Bethala, Lakshmi Anu Prabhavathi Devi +4 more
core +1 more source
Dibenzo[ f,h]furazano[3,4- b]quinoxalines: Synthesis by Intramolecular Cyclization through Direct Transition Metal-Free C-H Functionalization and Electrochemical, Photophysical, and Charge Mobility Characterization [PDF]
, 2020 Herein, we describe the synthesis of unsymmetrically substituted dibenzo[f,h]furazano[3,4-b]quinoxalines by intramolecular cyclization through direct transition metal-free C-H functionalization.
Charushin, V. N. +9 more
core +1 more source
Regioselective C‐H Thio‐ and Selenocyanation of Pyrazolo[1,5‐a]pyrimidines
Chemistry – An Asian Journal, EarlyView.A metal‐free, N‐chlorosuccinimide (NCS) mediated, highly efficient, and regioselective C−H thiocyanation and C−H selenocyanation of pyrazolo[1,5‐a]pyrimidines are achieved under mild reaction conditions for the synthesis of a wide variety of 3‐thiocyanato‐ and 3‐selenocyanatopyrazolo[1,5‐a]pyrimidines in good to excellent yield up to 99 %.
Paramita Pattanayak +3 more
wiley +1 more source
Chemistry – An Asian Journal, EarlyView.The preparation and characterization of the first helical pyrazino‐phenanthroline ligand, namely [4]helicene‐pyrazino[2,3‐f][1,10]phenanthroline (H4PP) and its corresponding Re(CO)3Cl complex (Re‐H4PP) are described. The photophysics and chiroptics (circular dichroism and circularly polarized luminescence) of these new chiral systems are thoroughly ...
Debsouri Kundu +5 more
wiley +1 more source
2-(2-Chlorophenyl)-3-(3,4-dimethoxyphenyl)quinoxaline [PDF]
, 2010 The title compound, C22H17ClN2O2, was synthesized by the condensation reaction between 1,2-phenylenediamine and 2-chloro-3′,4′-dimethoxybenzil in boiling acetic acid.
Bellizzi +8 more
core +3 more sources
Steric and Conformational Effects in Molecular Junctions
Chemistry – An Asian Journal, EarlyView.This review article discusses steric and conformational effects in molecular junctions, focusing on substituent effects, conformational flexibility, and mechanical manipulation, to understand the mechanism of the impact of these factors on molecular conductance.
Yuya Tanaka
wiley +1 more source
Results in Chemistry, 2023 Medicinal chemistry is a basic science that involves identification, synthesis and development of new drugs for therapeutic use. Biological importance of heterocycles makes them more crucial in pharmaceutical industries.In this work heterocyclics like ...
Geethavani Meka, Ramakrishna Chintakunta
doaj
New opportunities for the synthesis of quinoxaline derivatives
Chimica Techno Acta, 2019 Convenient methods for the synthesis of quinoxaline derivatives with the use of nucleophilic aromatic substitution of hydrogen in heteroaromatic part of molecule in conditions of the acid catalysis were elaborated.
Olga S. Koptyaeva +4 more
doaj +1 more source
, 2015 International audienceAmmonium bifluoride was efficiently used (at a 0.5 mol % loading) to catalyze the cyclocondensation between 1,2-arylenediamines and 1,2-dicarbonyl compounds at room temperature in methanol-water, affording quinoxalines and pyrido[2 ...
Chevallier, Floris +5 more
core +2 more sources
ChemMedChem, EarlyView.The review focuses on relationships of oxadiazole derivative structures and their antimycobacterial activity including target structures in mycobacteria, in vitro or in vivo pharmacokinetic parameters, and toxicity. Apart from direct antimycobacterial activity, some 1,2,4‐oxadiazole derivatives can potentiate the antimycobacterial effect of ethionamide
Marta Kučerová‐Chlupáčová
wiley +1 more source