Results 31 to 40 of about 9,953 (212)

Antimicrobial Evaluation and Synthesis of Some Phenylpyrazolo benzothiazolo quinoxaline Derivatives

E-Journal of Chemistry, 2009
2,3-Diphenyl quinoxaline (SI) was fused with 2-amino benzothiazoles (SII) by a methylene bridge, which was then allowed for acetylation. The acetylated product (SIV) was made to react with different aromatic aldehydes to give chalcones (SV1-SV5 ...
CH. Sridevi, K. Balaji, A. Naidu, R. Sudhakaran   +3 more
doaj   +1 more source

Reduction Potential Predictions for Thirty-Seven 1,4-di-N-Oxide Quinoxaline-2-Carboxamide Derivatives with Anti-Tuberculosis Activity

Compounds, 2023
The ability for density functional theory with the B3LYP functional with the lanl2dz basis set to predict the 1st (Wave 1) and 2nd (Wave 2) reductions of the diazine ring in a series of thirty-seven (37) 1,4-di-N-oxide quinoxaline-2-carboxamide ...
Faranak Pooladian, Philip W. Crawford, Jonathan M. Kessler, Garrett R. Casey, Christina M. Ragain   +4 more
doaj   +1 more source

Diazo Transfer From Nitrous Oxide Employing Phosphorus Ylides

Angewandte Chemie, EarlyView.
A phosphorus ylide‐mediated strategy achieves the direct fixation of nitrous oxide (N2O) to access diazo compounds, which after intra‐ or intermolecular trapping, afford N2‐containing organic building blocks. This approach provides an alternative to hazardous diazo‐transfer reagents and establishes N2O fixation as a sustainable methodology.
Jhen‐Kuei Yu, Jan Niclas Ludwig, Patrick Wolf Antoni, David Tymann, Max Martin Hansmann   +4 more
wiley   +2 more sources

An electron-deficient triosmium cluster containing the thianthrene ligand: Synthesis, structure and reactivity of [Os₃(CO)₉(μ3-η2-C₁₂H₇S₂)(μ-H)] [PDF]

, 2008
Reaction of [Os₃(CO)₁₀(CH₃CN)₂] with thianthrene at 80 °C leads to the nonacarbonyl dihydride compound [Os₃(CO)₉(μ-3,4-η²-C₁₂H₆S₂)(μ-H)₂] (1) and the 46-electron monohydride compound [Os₃(CO)₉(μ₃-η²-C₁₂H₇S₂)(μ-H)] (2).
Hassan, Mohammad R., Kabir, Shariff E., Karim, Md. Manzurul, Nicholson, Brian K., Raha, Arun K., Rosenberg, Edward, Salassa, Luca, Sharmin, Ayesha   +7 more
core   +1 more source

Quinoxaline 1,4-Dioxides: Advances in Chemistry and Chemotherapeutic Drug Development

Pharmaceuticals, 2023
N-Oxides of heterocyclic compounds are the focus of medical chemistry due to their diverse biological properties. The high reactivity and tendency to undergo various rearrangements have piqued the interest of synthetic chemists in heterocycles with N ...
Galina I. Buravchenko, Andrey E. Shchekotikhin   +1 more
doaj   +1 more source

Improved Computational Prediction of the Electrochemical Reduction Potential of Twenty 3-Aryl-Quinoxaline-2-Carbonitrile 1,4-Di-N-Oxide Derivatives

Computation, 2023
The ability of density functional theory (DFT) using the functional B3LYP with the cc-pVTZ basis set to accurately predict the electrochemical properties of 20 3-aryl-quinoxaline-2-carbonitrile 1,4-di-N-oxide derivatives in dimethylformamide (DMF) was ...
Shambhu Bhattarai, Pradeep Mareta, Philip W. Crawford, Jonathan M. Kessler, Christina M. Ragain   +4 more
doaj   +1 more source

Sinteza i biološko djelovanje novih 1-benzil i 1-benzoil 3-heterocikličkih derivata indola [PDF]

, 2010
Starting from 1-benzyl- (2a) and 1-benzoyl-3-bromoacetyl indoles (2b) new heterocyclic, 2-thioxoimidazolidine (4a,b), imidazolidine-2,4-dione (5a,b), pyrano(2,3-d)imidazole (8a,b and 9a,b), 2-substituted quinoxaline (11a,b–17a,b) and triazolo(4,3-a ...
A. Barry, A. Kar, A. Mandour, A. Mndzhoyan, E. El-Sawy, E. Szymanska, Eslam El-Sawy, Fatma Bassyouni, Hanaa Rady, J. Dickstein, J. Okuda, J. William, K. Bodendorf, M. Radwan, Mohamed Abdlla, R. Cao, R. Tiwari, S. Kotharkar, S. Martin, S. Sondhi, Sherifa Abu-Bakr, T. Mosmann, W. Qinjie, W. Reeve   +23 more
core   +2 more sources

Synthesis and biological evaluation of new quinoxaline derivatives as antioxidant and anti-inflammatory agents [PDF]

, 2011
We report the synthesis, anti-inflammatory and antioxidant activities of novel quinoxaline and quinoxaline 1,4-di-N-oxide derivatives. Microwave assisted methods have been used in order to optimize reaction times and to improve the yields.
Aldana, I. (Ignacio), Ancizu, S. (Saioa), Burguete, A. (Asunción), Hadjipavlou-Litina, D. (Dimitra), Monge, A. (Antonio), Moreno-de-Viguri, E. (Elsa), Pontiki, E. (Eleni), Pérez-Silanes, S. (Silvia), Solano, B. (Beatriz), Torres, E. (Enrique), Villar, R. (Raquel)   +10 more
core   +1 more source

The enthalpies of dissociation of the N-O bonds in two quinoxaline derivatives [PDF]

, 2009
The present work reports the first experimental thermochemical study of mono-N-oxides derived from quinoxaline, namely, 3-methoxycarbonyl-2-methyl-quinoxaline N-oxide and 3-ethoxycarbonyl-2-methyl-quinoxaline N-oxide.
Andre R Monteiro, Bruno B Campos, Jose R B Gomes, Maria D M C R Ribeiro da Silva, Paula Gomes   +4 more
core   +1 more source

Synthesis of Some Phenylpyrazolo Benzimidazolo Quinoxaline Derivatives as Potent Antihistaminic Agents

E-Journal of Chemistry, 2010
2,3-Diphenyl quinoxaline (NI) was fused with benzimidazole (NII) by a methylene bridge, which was then allowed for acetylation. The acetylated product (NIV) was made to react with different aromatic aldehydes to give chalcones (NV1-NV5).
C. H. Sridevi, K. Balaji, A. Naidu, R. Sudhakaran   +3 more
doaj   +1 more source