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Triazole Derivatives (triazole + derivative)
Selected AbstractsPositively Charged Iridium(III) Triazole Derivatives as Blue Emitters for Light-Emitting Electrochemical CellsADVANCED FUNCTIONAL MATERIALS, Issue 11 2010Mathias Mydlak Abstract Cationic blue-emitting complexes with (2,4-difluoro)phenylpyridine and different 1,2,3-triazole ligands are synthesized with different counterions. The influence of the substituents on the triazole ligand is investigated as well as the influence of the counterions. The substituents do not change the emission energy but, in some cases, slightly modify the excited-state lifetimes and the emission quantum yields. The excited-state lifetimes, in apolar solvents, are slightly dependent on the nature of the counterion. A crystal structure of one of the compounds confirms the geometry and symmetry postulated on the basis of the other spectroscopic data. Light-emitting electrochemical cell devices are prepared and the recorded emission is the bluest with the fastest response time ever reported for iridium complexes. [source] Design, Synthesis, and Antifungal Activity of Novel Conformationally Restricted Triazole DerivativesARCHIV DER PHARMAZIE, Issue 12 2009Wenya Wang Abstract A series of new triazole derivatives were designed and synthesized on the basis of the active site of lanosterol 14,-demethylase from Candida albicans (CACYP51). 2-(2,4-Difluorophenyl)-3-(methyl-(3-phenoxyalkyl)amino)-1-(1H -1,2,4-triazol-1-yl)propan-2-ols show excellent in-vitro activity against most of the tested pathogenic fungi. The MIC80 value of compound 8a against Candida albicans is 0.01 ,M, which provides a good starting template for further structural optimization. The binding modes of the designed compounds were investigated by flexible molecular docking. The compounds interacted with CACYP51 through hydrophobic, van-der-Waals, and hydrogen-bonding interactions. [source] ChemInform Abstract: [1,2,4]Triazole Derivatives as 5-HT1A Serotonin Receptor Ligands.CHEMINFORM, Issue 15 2002Maria Concetta Sarva Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Correlation between the predicted and the observed biological activity of the symmetric and nonsymmetric cyclic urea derivatives used as HIV-1 protease inhibitors.JOURNAL OF CELLULAR AND MOLECULAR MEDICINE, Issue 3 2003A 3D-QSAR-CoMFA method for new antiviral drug design Abstract The predicted inhibition constant (Ki) and the predicted inhibitor concentration (IC90) of the HIV-1 protease (HIV-1 PR) inhibitors: symmetric and nonsymmetric - benzyl, ketone, oxime, pyrazole, imidazole, and triazole cyclic urea derivatives, were obtained by the 3D-CoMFA (Comparative Molecular Field Analysis) method. The CoMFA statistical parameters: cross-validate correlation coefficient (q2), higher than 0.5, and the fitted correlation coefficient (r2), higher than 0.90 validated the predicted biological activities. The best predictions were found for the trifluoromethyl ketoxime derivative (log 1/Ki predict = 8.42), the m-pyridineCH2 pyrazole derivative (log 1/Ki predict = 9.77) and the 1,2,3 triazole derivative (log 1/Ki predict = 7.03). We attempted to design a new potent HIV-1 protease inhibitor by addition of o-benzyl to the (p-HOPhCH2) pyrazole 12f derivative inhibitor. A favorable steric area surrounded the o-benzyl, suggesting a possible new potent HIV-1 protease inhibitor. [source] ChemInform Abstract: Synthesis and Transformations of 1-(Azidophenyl)-1H-tetrazoles.CHEMINFORM, Issue 39 2010N. T. Pokhodylo Abstract The cyclization of azide (IV) with cyanoacetanilide (VII) affords triazole derivative (VIII), whilst the analogous reaction with ethyl acetoacetate (V) is accompanied by cleavage of the tetrazole ring [some yields not given]. [source] Synthesis of Antipyrine Derivatives Derived from DimedoneCHINESE JOURNAL OF CHEMISTRY, Issue 4 2007E. S. H. Ei ashry Abstract Coupling of dimedone with the diazonium salt of 4-aminoantipyrine afforded 2,3-dimethyl-4-[2-(5,5-dimethyl- 2,6-dioxocyclohex-2-ylidend)-hydrazino]-5-oxo-1-phenylpyrazoline (3). Reaction of 3 with excess phenylhydrazine gave the mixed trishydrazone derivative 4. Treatment of 3 with hydroxylamine produced the bisoxime 5 which upon dehydrative cyclization with acetic anhydride gave the corrsponding tetrahydrobenzo[d][1,2,3]triazole derivative 7. A one-pot synthesis of 7 was done by reacting 3 with hydroxylamine hydrochloride in pyridine, followed by heatment with acetic anhydride. [source] Promising antimicrobial agents: Synthetic approaches to novel tricyclic and tetracyclic pyrimidinones with antimicrobial propertiesJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 5 2010Hatem M. Gaber New tricyclic pyrimidinone derivatives were obtained from the corresponding thiazolopyrimidinone or hydrazino systems. The annelation of tricyclic hydrazino compound with 1,2,4-triazole and tetrazole moieties gave novel tetracyclic condensed pyrimidinones. The investigation of the antimicrobial properties of tricyclic and tetracyclic pyrimidinones, by agar-well diffusion assay, was carried out against six pathogenic bacteria (Bacillus cereus, Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Klebsiella spp, and Salmonella typhyrium) and four pathogenic fungi (Aspergillus flavus, Aspergillus niger, Aspergillus fumigatus, and Trichderma horozianum). Most of the compounds tested exhibited some degree of antimicrobial activity against microorganisms. Among these compounds, 4-benzylidenhydrazino-8-cyano-7-(furan-2-yl)thiazolo[3,2- a:4,5- d,]dipyrimidin-9-one (12) showed the most favorable antibacterial activity, while compound 17 showed the highest effect on fungi. Interestingly, tetrazole derivative 19 displayed a remarkable effect on fungi much more than the corresponding 3-substituted triazole derivatives on the one hand, whereas the lowest effect on bacteria on the other. J. Heterocyclic Chem., (2010). [source] Optical and electrochemical properties of copoly(aryl ether)s consisting of alternate 2,5-distyrylbenzene and electron-transporting oxadiazole or triazole derivativesJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 21 2005Shinn-Horng Chen Abstract New copoly(aryl ether) P1 consisting of alternate electron-transporting 2-(3-(trifluoromethyl)phenyl)-5-(4-(5-(3-(trifluoromethyl)phenyl)-1,3,4-oxadiazol-2-yl)-2,5-bis(hexyloxy)phenyl)-1,3,4-oxadiazole and hole-transporting 2,5-distyrylbenzene (DSB) was synthesized via nucleophilic substitution polymerization. We investigated the optical and electrochemical properties of alternate copoly(aryl ether)s P1,P6, which contain the same hole-transporting DSB segments, but with different electron transporting segments. The effect of trifluoromethyl groups in electron transporting segments is also discussed. Referencing to the spectra of their model compounds M1,M4, the emissions of P1,P3 are dominated exclusively by the hole-transporting fluorophores with longer emissive wavelength about 452,453 nm via efficient excitation energy transfer. Furthermore, P1,P3 also exhibit unique variations in energy transfer in acidic media and solvatochromism in organic solvents. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of P1,P4, estimated from electrochemical data, are ,5.12, ,5.15, ,5.18, ,5.00 eV and ,2.93, ,3.39, ,3.49, ,2.76 eV, respectively. The electron and hole affinity of P1,P6 can be enhanced simultaneously by introducing isolated hole- and electron-transporting segments in backbone. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 5083,5096, 2005 [source] Design, Synthesis, and Antifungal Activity of Novel Conformationally Restricted Triazole DerivativesARCHIV DER PHARMAZIE, Issue 12 2009Wenya Wang Abstract A series of new triazole derivatives were designed and synthesized on the basis of the active site of lanosterol 14,-demethylase from Candida albicans (CACYP51). 2-(2,4-Difluorophenyl)-3-(methyl-(3-phenoxyalkyl)amino)-1-(1H -1,2,4-triazol-1-yl)propan-2-ols show excellent in-vitro activity against most of the tested pathogenic fungi. The MIC80 value of compound 8a against Candida albicans is 0.01 ,M, which provides a good starting template for further structural optimization. The binding modes of the designed compounds were investigated by flexible molecular docking. The compounds interacted with CACYP51 through hydrophobic, van-der-Waals, and hydrogen-bonding interactions. [source] Synthesis and Evaluation of New Thiodigalactoside-Based Chemical Probes to Label Galectin-3CHEMBIOCHEM, Issue 10 2009Monique van Scherpenzeel Abstract Light up galectin: Photoprobes based on thiodigalactoside were prepared for galectin-3, a lectin linked to cancer. The probes contained either benzophenone or acetophenone moieties as the photolabel for covalent attachment to the protein. One particular probe labeled galectin-3 selectively, even in the presence of cell lysate. New chemical probes were synthesized to label galectin-3. They are based on the high affinity thiodigalactoside ligand. The probes were synthesized with benzophenone or acetophenone moieties as the photolabel for covalent attachment to the protein. Besides labeling the protein, these aromatic photolabels also greatly enhance the affinity of the probes towards galectin-3, due to the interaction of the photolabel with two arginine guanidinium groups of the protein. The linkage between the sugar and the photolabel was varied as an ester, an amide, and a triazole. For the amide and triazole derivatives, a versatile synthetic route towards a symmetrical 3-azido-3-deoxy-thiodigalactoside was developed. The new probes were evaluated for their binding affinity of human galectin-3. They were subsequently tested for their labeling efficiency, as well as specificity in the presence of a protein mixture and a human cancer cell lysate. [source] ChemInform Abstract: Synthesis and Biological Activity of Mono- and Disubstituted 1,2,4-Triazole Derivatives.CHEMINFORM, Issue 33 2010Vytautas Mickevicius Abstract Novel substituted triazole derivatives are synthesized by condensation reactions of hydrazinocarbonylpyrrolidinones (I) with cyanates or thiocyanates. [source] | |||||||||||||