Results 31 to 40 of about 14,696 (253)

Silica Bonded S-Sulfonic Acid: A Recyclable Catalyst for the Synthesis of Quinoxalines at Room Temperature

Molecules, 2009
The reaction of 3-mercaptopropylsilica (MPS) and chlorosulfonic acid in chloroform afforded silica bonded S-sulfonic acid (SBSSA), which was used as a catalyst for the room temperature synthesis of quinoxaline derivatives from 1,2-diamino compounds and 1,
Khodabakhsh Niknam, Maleki Mohagheghnejad, Dariush Saberi   +2 more
doaj   +1 more source

Dual Allosteric Effect in Glycine/NMDA Receptor Antagonism: A Comparative QSAR Approach

Pharmaceuticals, 2010
A comparative Hantzsch type QSAR study was conducted using multiple regression analysis on various sets of quinoxalines, quinoxalin-4-ones, quinazoline-2-carboxylates, 4-hydroxyquinolin-2(1H)-ones, 2-carboxytetrahydroquinolines, phenyl-hydroxy-quinolones,
Vipin B. Gupta, Manish Sharma
doaj   +1 more source

Preparation, structures and preliminary host–guest studies of fluorinated syn-bis-quinoxaline molecular tweezers

Beilstein Journal of Organic Chemistry, 2010
A series of polycyclic frameworks with fluorinated syn-facial quinoxaline sidewalls has been prepared as potential molecular tweezers for electron-rich guest compounds.
Markus Etzkorn, Jacob C. Timmerman, Matthew D. Brooker, Xin Yu, Michael Gerken   +4 more
doaj   +1 more source

Fused-Ring Derivatives of Quinoxalines: Spectroscopic Characterization and Photoinduced Processes Investigated by EPR Spin Trapping Technique

Molecules, 2014
10-Ethyl-7-oxo-7,10-dihydropyrido[2,3-f]quinoxaline derivatives, synthesized as promising biologically/photobiologically active compounds were characterized by UV/vis, FT-IR and fluorescent spectroscopy.
Zuzana Barbieriková, Dana Dvoranová, Maroš Bella, Viktor Milata, Adriana Czímerová, Vlasta Brezová   +5 more
doaj   +1 more source

Simplified Kinetics and Colour Formation in Sucrose Solutions Based on A-Dicarbonyl Compounds [PDF]

, 2007
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence
Fiedler, Thorsten, Kroh, Lothar, Kurz, Tomas, Smejkal, Quido   +3 more
core   +1 more source

Small Band Gap Polymers Synthesized via a Modified Nitration of 4,7-Dibromo-2,1,3-benzothiadiazole [PDF]

, 2010
The nitration of 4,7-dibromo-2,1,3-benzothiadiazole was modified by using CF3SO3H and HNO3 as the nitrating agent, and the related yield was improved greatly.
Andersson, Mats R., Hellström, Stefan, Hou, L. T., Inganas, O., Mammo, W., Wang, Ergang, Wang, Z. Q., Zhang, F. L.   +7 more
core   +1 more source

Studies on Log Po/w of Quinoxaline di-N-Oxides: A Comparison of RP-HPLC Experimental and Predictive Approaches

Molecules, 2011
As reported in our previous papers, a series of quinoxaline-2-carboxamide 1,4-di-N-oxide derivatives were synthesized and studied as anti-tuberculosis agents. Here, the capability of the shake-flask method was studied and the retention time (expressed as
James A. Platts, Antonio Monge, Ignacio Aldana, Mauro Ravera, Enrique Torres, Silvia Pérez-Silanes, Elisabetta Gabano, Elsa Moreno   +7 more
doaj   +1 more source

Novel Synthetic Routes to Prepare Biologically Active Quinoxalines and Their Derivatives: A Synthetic Review for the Last Two Decades

Molecules, 2021
Quinoxalines, a class of N-heterocyclic compounds, are important biological agents, and a significant amount of research activity has been directed towards this class.
Hena Khatoon, Emilia Abdulmalek
doaj   +1 more source

Thermochemical and Theoretical Studies of 2-Hydroxyquinoxaline, 2,3-Dihydroxyquinoxaline, and 2-Hydroxy-3-methylquinoxaline [PDF]

, 2000
The standard (p° = 0.1 MPa) molar enthalpies of formation for crystalline 2-hydroxyquinoxaline, 2,3-dihydroxyquinoxaline, and 2-hydroxy-3-methylquinoxaline were derived from the standard molar enthalpies of combustion, in oxygen, at T = 298.15 K ...
Matos, M. A. R., Miranda, M. S., Morais, V. M. F., Ribeiro da Silva, M. A. V., Rio, Carolina   +4 more
core   +1 more source

Condensation of 4-hydroxy-2-thiazolines with 1,2-phenylenediamine as a novel effective route to thiazolo[3,4-a]quinoxalines [PDF]

, 2004
Thiazolo[3,4-a]quinoxalin-4-ones were prepared in two steps starting from methyl phenylchloropyruvate using a new strategy for the construction of the ring system. A key step in this new method involves the reaction of 4-hydroxytetrahydrothiazoles with 1,
Gubaidullin, Aidar T, Litvinov, Igor A, Mamedov, Vakhid A., Nurkhametova, Ilsiyar Z, Tsuboi, Sadao   +4 more
core   +1 more source