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    Crystal Structure, Hirshfeld Surface Analysis, In-Silico and Antimycotic Investigations of Methyl 6-methyl-4-(4-nitrophenyl)-2-oxo-1,2-dihydropyrimidine-5-carboxylate
    (Mdpi, 2023) Huseynzada, Alakbar; Mori, Matteo; Meneghetti, Fiorella; Israyilova, Aygun; Guney, Elif; Sayin, Koray; Chiarelli, Laurent R.
    Herein, we report the preparation of methyl 6-methyl-4-(4-nitrophenyl)-2-oxo-1,2-dihydropyrimidine-5-carboxylate 2, obtained by the regioselective oxidative dehydrogenation of the dihydropyrimidine derivative 1 in the presence of cerium ammonium nitrate. The structure of compound 2 was investigated by single-crystal X-ray diffraction (SC-XRD), which allowed the determination of its tautomeric form. Moreover, the presence of non-covalent interactions and their impact on the crystal structure were analyzed. To better characterize the intermolecular contacts, the Hirshfeld surface and enrichment ratio analyses were performed. Furthermore, the antimycotic activity of compounds 1 and 2 was investigated against Candida albicans, Aspergillus flavus, and Aspergillus niger, and their efficacy was compared to that of fluconazole. Computational investigations on the putative target of the compounds provided insights to explain the better activity of 2 with respect to its synthetic precursor.
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    Synthesis, crystal structure, Hirshfeld surface, computational and antibacterial studies of a 9-phenanthrenecarboxaldehyde-based thiodihydropyrimidine derivative
    (Elsevier, 2022) Huseynzada, Alakbar; Mori, Matteo; Meneghetti, Fiorella; Israyilova, Aygun; Tuzun, Gamze; Sayin, Koray; Chiarelli, Laurent R.
    We report herein the synthesis of a new biologically active 3,4-dihydropyrimidin-2(1H)-thione derivative ( 4 ) from 9-phenanthrenecarboxaldehyde, thiourea, and methyl acetoacetate by the Biginelli reaction. The structure of the synthesized compound was investigated by NMR spectroscopy, mass spectrometry, and elemental analysis. Moreover, to gain insight into the conformation and crystal packing, the structure of the novel dihydropyrimidine was also studied by single-crystal X-ray diffraction. The Hirshfeld surface and contact enrichment analyses were used to better understand the molecular interactions. Considering the biological activity of dihydropyrimidines, the antibacterial effect of the synthesized compound was evaluated against A. baumanii, E. coli, P.aeruginosa, K. pneumoniae, and S. aureus; interestingly, high activ-ity was detected against S. aureus. Additionally, computational studies were performed using the Gaussian package and the Maestro Schrodinger programs, and the theoretical IR and NMR spectra of compound 4 were examined. Finally, an ADME/T analysis was performed to estimate the drug-likeness of the com-pound.(c) 2022 Elsevier B.V. All rights reserved.
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    Synthesis, nanostructuring and in silico studies of a new imine bond containing a macroheterocycle as a promising PBP-2a non-?-lactam inhibitor
    (Royal Soc Chemistry, 2023) Huseynzada, Alakbar; Aghayev, Mirjavid; Hajiyeva, Sarvinaz; Israyilova, Aygun; Sayin, Koray; Gasimov, Eldar; Rzayev, Fuad
    This study is devoted to the synthesis of a 40-membered macroheterocycle with its further nanostructuring by magnetite nanoparticles. The mentioned macroheterocycle was synthesized by the [2+2] cyclocondensation of the oxygen-containing diamine with an aromatic dialdehyde in a non-catalytic medium and with no work-up procedure. The structure of the obtained macroheterocycle was studied by H-1 and C-13 nuclear magnetic resonance spectroscopy and matrix-assisted laser desorption/ionization-time of flight mass spectrometry. Furthermore, the nanosupramolecular complex of macroheterocycles with magnetite nanoparticles was obtained and investigated by Fourier-transform infrared and ultraviolet-visible spectroscopy methods. Shifts in the infrared spectra of the nanosupramolecular complex indicate the interaction through metal-aromatic ring non-covalent bonding. The shift is also observed for the C-O-C stretching band of ether bonds. The loading rate of macroheterocycles on magnetite nanoparticles was 18.6%. The morphology of the ensemble was studied by transmission electron microscopy, which confirmed the synthesis of nanospherical particles with a diameter range of 10-20 nm. Powder X-ray diffraction analysis showed patterns of cubic Fe3O4 nanoparticles with a crystallite size equal to 9.1 nm. The macroheterocycle and its nanosupramolecular complex were tested against Klebsiella pneumoniae, Pseudomonas aeruginosa and Staphylococcus aureus. The results have shown that the created complex has shown 64 times better activity against Staphylococcus aureus in comparison with the individual macroheterocycle and 32 times better activity in comparison with the pristine antibiotic Ampicillin as a control. In addition, computational analysis of the macroheterocycle was performed at the B3LYP/6-31G level in water. Molecular docking analyses for the macroheterocycle revealed Penicillin-binding protein PBP2a (5M18) from the transpeptidase family as a target protein in Staphylococcus aureus.