Results 41 to 50 of about 14,648 (255)

Development and application of in silico models to design new antibacterial 5-amino-4-cyano-1,3-oxazoles against colistin-resistant E. coli strains

Artificial Intelligence Chemistry, 2023
Here we describe the results of QSAR analysis based on artificial neural networks, synthesis, activity evaluation and molecular docking of a number of 1,3-oxazole derivatives as anti-E. coli antibacterials.
Ivan Semenyuta, Diana Hodyna, Vasyl Kovalishyn, Bohdan Demydchuk, Maryna Kachaeva, Stepan Pilyo, Volodymyr Brovarets, Larysa Metelytsia   +7 more
doaj  

Ultrafast electron dynamics following outer-valence ionization: The impact of low-lying relaxation satellite states [PDF]

J. Chem. Phys. 130, 154305 (2009), 2008
Low-lying relaxation satellites give rise to ultrafast electron dynamics following outer-valence ionization of a molecular system is studied. To demonstrate the impact of such satellites, the evolution of the electronic cloud after sudden removal of an electron from the highest occupied molecular orbital (HOMO) of the organic unsaturated nitroso ...
arxiv   +1 more source

1,4- Addition of diazomethane to a heterodiene: a direct preparation of the oxazolic ring

Anais da Academia Brasileira de Ciências, 2007
The reaction of naphthoquinone-oximes (3) and (4) with diazomethane yields directly, in one step, the oxazoles (5) and (6), respectively.A reação das naphthoquinona-oximas (3) e (4) com diazometano fornece diretamente, em uma etapa, os oxazóis (5) e (6),
Flávio da S. Emery, Raphael S.F. Silva, Kelly C.G. de Moura, Maria C.F.R. Pinto, Mauro B. Amorim, Valéria R.S. Malta, Regina H.A. Santos, Kátia M. Honório, Albérico B.F. da Silva, Antonio V. Pinto   +9 more
doaj   +1 more source

2-(3-Bromophenyl)imidazo[2,1-b]oxazole

Molbank, 2023
The microwave-assisted reaction of 2-nitroimidazole with 3-bromophenacyl bromide in the presence of potassium carbonate as a base and dimethylformamide as a solvent afforded 2-(3-bromophenyl)imidazo[2,1-b]oxazole.
Ángel Cores, Mercedes Villacampa, J. Carlos Menéndez   +2 more
doaj   +1 more source

Photoactivatable prodrugs of butyric acid based on new coumarin fused oxazole heterocycles [PDF]

, 2017
New coumarin fused oxazoles were investigated as photosensitive units for carboxylic acid groups using butyric acid as a model compound. 6-Oxo-6H-benzopyrano[6,7-d]oxazol-8-yl)methyl derivatives possessing various (hetero)aromatic substituents at ...
Ana M.S. Soares, Brieke, Dore, Fernandes, Fernandes, Fernandes, Fonseca, Furuta, Ghosh, Givens, Graham Hungerford, Hungerford, Kim, Klán, Lakowicz, Lavis, Lee, Loudwig, M. Sameiro T. Gonçalves, Miller, Morris, Muller, Nguyen, Nudelman, Nudelman, Piloto, Piloto, Piloto, Santini, Shell, Soares, Soares, Soares, Soares, Soares, Susana P.G. Costa, Vidali   +36 more
core   +1 more source

Investigation on the reactivity of α-azidochalcones with carboxylic acids: Formation of α-amido-1,3-diketones and highly substituted 2-(trifluoromethyl)oxazoles

Beilstein Journal of Organic Chemistry, 2015
The reaction of α-azidochalcones with carboxylic acids has been investigated resulting in the formation of α-amido-1,3-diketones under microwave irradiation via in situ formation of 2H-azirine intermediates.
Kandasamy Rajaguru, Arumugam Mariappan, Rajendran Suresh, Periasamy Manivannan, Shanmugam Muthusubramanian   +4 more
doaj   +1 more source

Transition metal-free cycloisomerization of propargylic amides to oxazoles in hexafluoroisopropanol (HFIP) [PDF]

, 2022
A transition metal-free method for the cycloisomerization of propargylic amides to oxazoles was developed. The reaction utilizes in situ generated hydrogen chloride in hexafluoroisopropanol (HFIP).
Dietrich, Julian, Jankowski, Nicholas, Krause, Norbert   +2 more
core  

The LANCA three-component reaction to highly substituted β-ketoenamides – versatile intermediates for the synthesis of functionalized pyridine, pyrimidine, oxazole and quinoxaline derivatives

Beilstein Journal of Organic Chemistry, 2019
The LANCA three-component reaction of lithiated alkoxyallenes LA, nitriles N and carboxylic acids CA leads to β-ketoenamides KE in good to excellent yields.
Tilman Lechel, Roopender Kumar, Mrinal K. Bera, Reinhold Zimmer, Hans-Ulrich Reissig   +4 more
doaj   +1 more source

Repositioning Antitubercular 6-Nitro-2,3-dihydroimidazo[2,1-b][1,3]oxazoles for Neglected Tropical Diseases: Structure-Activity Studies on a Preclinical Candidate for Visceral Leishmaniasis. [PDF]

, 2016
6-Nitro-2,3-dihydroimidazo[2,1-b][1,3]oxazole derivatives were initially studied for tuberculosis within a backup program for the clinical trial agent pretomanid (PA-824).
Blaser, Adrian, Denny, William A, Franzblau, Scott G, Gupta, Suman, Launay, Delphine, Ma, Zhenkun, Maes, Louis, Martin, Denis, O'Connor, Patrick D, Thompson, Andrew M, Wan, Baojie, Wang, Yuehong, Yardley, Vanessa   +12 more
core   +3 more sources

Alkoxyallene‐Based LANCA Three‐Component Synthesis of 1,2‐Diketones, Quinoxalines, and Unique Isoindenone Dimers and a Computational Study of the Isoindenone Dimerization [PDF]

, 2020
A series of β‐alkoxy‐β‐ketoenamides was prepared by the well‐established LANCA three‐component reaction of lithiated 1‐(2‐trimethylsilylethoxy)‐substituted allenes, nitriles, and α,β‐unsaturated carboxylic acids.
Bera M. K., Holland J. M., Lechel T., Lechel T., Zimmer R., Zimmer R., Zimmer R.   +6 more
core   +1 more source