Results 11 to 20 of about 132,796 (171)

[Studies on heterocyclic compounds. 3. Ring closure reaction of 4,5-diamino-6-substituted-aminopyrimidines].

YAKUGAKU ZASSHI, 1966
T. Okano, S. Goya, A. Takadate, Y. Ito
semanticscholar   +5 more sources

Synthesis, reactions and biological activity of some new bis-heterocyclic ring compounds containing sulphur atom

Chemistry Central Journal, 2013
BackgroundThe derivatives of thieno[2,3-b]thiophene belong to a significant category of heterocyclic compounds, which have shown a wide spectrum of medical and industrial application.ResultsA new building block with two electrophilic center of thieno[2,3-
Y. Mabkhot, A. Barakat, A. M. Al‐Majid, Saeed Alshahrani, S. Yousuf, M. I. Choudhary   +5 more
semanticscholar   +1 more source

Synthesis of New Heterocyclic compounds derived from Pyrazoline-5-one compound

Al-Mustansiriyah Journal of Pharmaceutical Sciences, 2011
In this work new heterocyclic pyrazolin derivatives have been synthesized from diazonium chloride salt of 4-aminobenzoic acid: firstly, Azo compounds were prepared from the reaction of an ethanolic solution of sodium acetate and calculated amount of ...
Rafah F. Al-Smaisim, Redha E. Al-Bayati, Abdul Hussain K. Sharba   +2 more
doaj   +1 more source

X-ray Structures of 3-Acetyloxazolidin-2-one, 3-Acetyloxazolin-2-one and Oxazolin-2(3H)-one

Molbank, 2022
The X-ray structures of three simple heterocyclic compounds have been obtained for the first time. Structures of both 3-acetyloxazolidin-2-one 1 and its unsaturated analogue 3-acetyloxazolin-2-one 3 show a planar imide nitrogen with the exocyclic C=O ...
R. Alan Aitken, Joe S. Logan, Alexandra M. Z. Slawin   +2 more
doaj   +1 more source

Internal conversion and intersystem crossing pathways in UV excited, isolated uracils and their implications in prebiotic chemistry [PDF]

Phys. Chem. Chem. Phys. 18, 20168 (2016), 2019
The photodynamic properties of molecules determine their ability to survive in harsh radiation environments. As such, the photostability of heterocyclic aromatic compounds to electromagnetic radiation is expected to have been one of the selection pressures influencing the prebiotic chemistry on early Earth.
arxiv   +1 more source

Synthesis and studies molecular docking of some new thioxobenzo[g]pteridine derivatives and 1,4-dihydroquinoxaline derivatives with glycosidic moiety

Journal of Taibah University for Science, 2018
The present work is mainly dedicated to heterocyclic compounds as well as S-glycoside. 1,4-dihydroquinoxaline derivatives 3 were obtained from the reaction 2 with carbon disulfide in presence of potassium hydroxide.
Amira A. Ghoneim, Nadia Ali Ahmed Elkanzi, Rania B. Bakr   +2 more
doaj   +1 more source

Synthesis and antitumor activity evaluation of new 2-(4-aminophenyl)benzothiazole derivatives bearing different heterocyclic rings

Journal of Enzyme Inhibition and Medicinal Chemistry, 2015
Twenty-five new N-[4-(benzothiazole-2-yl)phenyl]acetamide derivatives bearing different heterocyclic ring systems were synthesized using 2-(4-aminophenyl)benzothiazole structure as a pharmacophoric group. Final compounds were screened for their potential
Leyla Yurttaş, Funda Tay, Ş. Demirayak
semanticscholar   +1 more source

Antimicrobial activity of thiophene derivatives derived from ethyl (E)-5-(3-(dimethylamino)acryloyl)-4-methyl-2-(phenylamino)thiophene-3-carboxylate

Chemistry Central Journal, 2017
Background The thiophene nucleus has been recognized as an important entity in the synthesis of heterocyclic compounds with promising pharmacological characteristics.
Yahia Nasser Mabkhot, Nahed Ahmed Kaal, Seham Alterary, Salem S. Al-Showiman, Thoraya A. Farghaly, Mohammad S. Mubarak   +5 more
doaj   +1 more source

Fan-shaped and toric textures of mesomorphic oxadiazoles [PDF]

Phase Transitions, Vol.80, 987-998, 2007, 2007
When a family of non symmetrical heterocycled compounds is investigated, a variety of mesophases can be observed with rather different features. Here we report the behaviour of seven different members among a family of such materials, that consists of mesomorphic oxadiazole compounds.
arxiv   +1 more source

Multicomponent reactions for synthesis of bioactive polyheterocyclic ring systems under controlled microwave irradiation

Arabian Journal of Chemistry, 2014
The multi-component reaction of 1-benzothiopyran-4-ones with heterocyclic amines and dimethylformamide-dimethylacetal (DMFDMA) in DMF at 150 °C under controlled microwave heating afforded novel poly-heterocyclic ring systems.
Eman M.H. Abbas, Sobhi M. Gomha, Thoraya A. Farghaly   +2 more
doaj   +1 more source