Results 21 to 30 of about 92,958 (217)

Microwave-Assisted Synthesis and Evaluation of Antimicrobial Activity of 3-{3-(s-Aryl and s-Heteroaromatic)acryloyl}-2Hchromen-2-one Derivatives [PDF]

, 2010
The exploration of potential utilization of microwaves as an energy source for heterocyclic synthesis was herein investigated using condensation of 3-acetylcoumarin (1) with aromatic and heteroaromatic aldehydes to afford the corresponding aromatic ...
Ajani, Al-Soud, Anderson, Anzari, Curir, DekicÌ, Devi, Gaber, Govori, Gürsoy, Hayes, Hwu, Jayashree, Kontogiorgis, Kostova, Kotali, Lacy, Larsen, Lee, Lewis, Lisgarten, Luszcski, Lévai, Majumdar, Mashelkar, Meteeva, Montagner Souza, Mouri, Neyts, Pivonka, Ragitha, Raviraj, Roma, Russell, Satyanarayana, Saxena, Schobert, Siddiqui, Son, Srinivas, Tamilvanan, Tassies, Tosun, Tran, Venugopala, Yamamoto, Yenjai, Yun   +47 more
core   +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

Synthesis of 1,4-Disubstituted Mono and Bis-triazolocarbo-acyclonucleoside Analogues of 9-(4-Hydroxybutyl)guanine by Cu(I)-Catalyzed Click Azide-Alkyne Cycloaddition [PDF]

, 2011
A series of novel mono-1,2,3-triazole and bis-1,2,3-triazole acyclonucleoside analogues of 9-(4-hydroxybutyl)guanine was prepared via copper(I)-catalyzed 1,3-dipolar cycloaddition of N-9 propargylpurine, N-1-propargylpyrimidines/as-triazine with the ...
Engels, Joachim W., Krim, Jamal, Taourirte, Mohamed   +2 more
core   +2 more sources

Quantum Chemical Studies on the Corrosion Inhibition of Mild Steel by Some Triazoles and Benzimidazole Derivatives in Acidic Medium

International Journal of Electrochemical Science, 2012
Quantum chemical calculations using the Density Functional Theory (DFT) method at three different basis sets, namely, 6-31(d,p), 6-31+(d,p) and 6-311G(d,p) were performed on selected triazole and benzimidazole derivatives, namely 2-aminobenzimidazole ...
Mwadham M. Kabanda, Lutendo C. Murulana, Muzaffer Ozcan, Faruk Karadag, Ilyas Dehri, I.B. Obot, Eno E. Ebenso   +6 more
doaj   +1 more source

Asymmetric addition of chiral boron-ate complexes to cyclic iminium ions [PDF]

, 2014
Boron-ate complexes derived from enantioenriched secondary benzylic boronic esters and aryl lithiums have been reacted with quinolinium, pyridinium and dihydroisoquinolinium salts to give enantioenriched heterocyclic structures with very high ...
Aggarwal, Varinder K., Feeney, Katie M J, Leonori, Daniele, Mohiti, Maziar, Rampalakos, Konstantinos   +4 more
core   +2 more sources

Synthesis and Antibacterial Activity of bis Heterocyclic Derivatives of 1,3,4-thiadiazole

Iraqi Journal of Pharmaceutical Sciences, 2017
The Chemistry of heterocyclic sulphur and nitrogen containing compounds have a great role in the  field of scientific studies, The 2-amino 5-mercapto-1,3,4-thiadiazole ring for instance, has gained more importance in recent years because  they are ...
Ahlam A. Al-jubouri, Ahlam J. Qasir
doaj   +3 more sources

Synthesis and Biological Activities of Ethyl 2-(2-pyridylacetate) Derivatives Containing Thiourea, 1,2,4-triazole, Thiadiazole and Oxadiazole Moieties

Molecules, 2017
Thirty six novel heterocyclic derivatives of ethyl 2-(2-pyridylacetate) were efficiently synthesized. The new compounds involve the linkage of a 2-pyridyl ring with thiosemicarbazide (compounds 1–7), 1,2,4-triazole (compounds 1a–7a), 1,3,4-thiadiazole ...
Daniel Szulczyk, Piotr Tomaszewski, Michał Jóźwiak, Anna E. Kozioł, Tadeusz Lis, David Collu, Filippo Iuliano, Marta Struga   +7 more
doaj   +1 more source

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

Triazole-Directed Pd-Catalyzed C(sp2)–H Oxygenation of Arenes and Alkenes [PDF]

, 2016
Selective Pd-catalyzed C(sp2)–H oxygenation of 4-substituted 1,2,3-triazoles is described. Unlike previous metal-catalyzed C–H functionalization events, which preferentially occur at the activated heterocyclic C–H bond, the regioselective oxygenation of ...
Aizpurua Iparraguirre, Jesús María, Correa Navarro, Arkaitz, Irastorza Epelde, Aitziber   +2 more
core   +2 more sources

New 1-(3-Nitrophenyl)-5,6-dihydro-4H-[1,2,4]triazolo[4,3-a][1,5]benzodiazepines: Synthesis and Computational Study

Molecules, 2015
Triazole derivatives constitute an important group of heterocyclic compounds have have been the subject of extensive study in the recent past. These compounds have shown a wide range of biological and pharmacological activities.
Lidija Kosychova, Antanas Karalius, Zita Staniulytė, Romualdas Aleksas Sirutkaitis, Algirdas Palaima, Audrius Laurynėnas, Žilvinas Anusevičius   +6 more
doaj   +1 more source