Results 71 to 80 of about 132,796 (171)
Chemistry of Substituted Thiazinanes and Their Derivatives
Molecules, 2020 Thiazinanes and its isomeric forms represent one of the most important heterocyclic compounds, and their derivatives represented a highly potent drug in disease treatment such as, 1,1-dioxido-1,2-thiazinan-1,6-naphthyridine, which has been shown to have ...
Alaa A. Hassan +3 more
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Arabian Journal of Chemistry, 2021 Continuing in our researches on the syntheses, reactivity, pharmacological/biological activities of heterocyclic compounds containing one or more nitrogen atoms we have examined some chemico-physical properties (1H and 13C NMR, electrochemical behavior ...
El Mostapha Rakib +10 more
doaj
Al-Mustansiriyah Journal of Pharmaceutical Sciences, 2018 A series of sulfamethoxazole derivatives attached to heterocyclic ring such as 1,2-diazepane (3), 1,3,4-oxadiazole (4), two pyrazoles (5,6), 1,2,4-triazine (7), 1,3,4-oxadiazine (8) and four novel 1,3-oxazepines (14-17)were designed and synthesized in ...
Ayad Kareem Khan
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Grasas y Aceites, 1996 The reaction of Nα-acetyl-L-histidine with diazomethane was studied in order to analyze the esterification reaction of a carboxylic group in the presence of an imidazole ring. The reaction produced the expected Nα-acetyl-L-histidine methyl ester (1) as a
R. Zamora, F. J. Hidalgo
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Variations in the 6.2 $μ$m emission profile in starburst-dominated galaxies: a signature of polycyclic aromatic nitrogen heterocycles (PANHs)? [PDF]
, 2017 Analyses of the polycyclic aromatic hydrocarbon (PAH) feature profiles, especially the 6.2 $\mu$m feature, could indicate the presence of nitrogen incorporated in their aromatic rings. In this work, 155 predominantly starburst-dominated galaxies (including HII regions and Seyferts, for example), extracted from the Spitzer/IRS ATLAS project (Hern\'an ...
arxiv +1 more source
Molecules, 2017 A group of flavones, isoflavones, flavanones, and chalcones was subjected to small-scale biotransformation studies with the Gram-negative Stenotrophomonas maltophilia KB2 strain in order to evaluate the capability of this strain to transform flavonoid ...
Edyta Kostrzewa-Susłow +4 more
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Is ESA Relationship The Tool In Searching For Interstellar Heterocycles? [PDF]
arXiv, 2019 Because of their importance in biological systems, in our understanding of the solar system and in other applications, seven heterocycles; furan, imidazole, pyridine, pyrimidine, pyrrole, quinoline and isoquinoline have been astronomically searched for in different molecular clouds with only the upper limits in the range of 4*1012 to 2.8*1021cm-2 ...
arxiv
, 1971 Preparations of pyridine N-oxide (7a) and N-aminopyridinium chloride (10a) by ring opening of a quaternary pyridinium salt and successive recyclization were investigated, and the following methods established.
Y. Tamura, N. Tsujimoto, M. Mano
semanticscholar +1 more source
Molecules, 2005 This review presents a survey of the condensations of 3-formylchromone with various active methylene and methyl compounds, e.g. malonic or barbituric acid derivatives, five-membered heterocycles, etc.
M. Lácova, R. Gasparová
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Preparation and Characterization of Heterocyclic Compounds Containing S, Se, and Te Ring Atoms
, 2006 The synthesis and characterization of some heterocyclic compounds containing S, Se, and Te ring atoms are reported. The compounds 2,3-dihydro-2-isopropyl-7-(N-isopropylcarbamoyl)-1,2-benzisothiazole-3-oxide (1a), 2,3-dihydro-2-isopropyl-7-(N ...
G. Steinfeld, B. Kersting
semanticscholar +1 more source