A series of Schiff bases of 4-amino-1,2,4-triazole derivatives containing pyrazole (5a-h) were synthesized from condensation of 4-amino-5-(5-methyl-1H-pyrazol-3-yl)-4H-1,2,4-triazole-3-thiol (3) derivative with various aromatic aldehydes (4a-h). The structures of the synthesized compounds were elucidated by IR, H NMR, C NMR, and mass spectrometry. All the synthesized compounds (5a-h) were screened for their in vivo analgesic and in vitro antioxidant activities revealing significant analgesic and antioxidant properties.
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http://dx.doi.org/10.1016/j.pharma.2016.03.005 | DOI Listing |
Chem Biodivers
January 2025
Al-Azhar University - Assiut Branch, Pharmacology, Assiut, Cairo, EGYPT.
Herein, Schiff base was synthesized via reaction between 2-bromo-4-(trifluoromethoxy)aniline and 2-hydroxybenzaldehyde. The ligand was reacted with Cu(II) salt to obtain complex. The compounds were characterization using various techniques.
View Article and Find Full Text PDFMol Divers
January 2025
Department of Pharmaceutics, College of Pharmacy, King Saud University, 11451, Riyadh, Saudi Arabia.
The current research focused on the synthesis of two series of pyrazole derivatives and evaluation of their insecticidal effectiveness. In the first series, seven pyrazole Schiff bases 3a-g were successfully synthesized with yields (79-95%) by condensing phenylfuran-2-carbaldehyde with substituted pyrazole rings. In the second series, eleven amino acid-pyrazole conjugates 6a-k were synthesized utilizing acetic acid, sulfuric acid, morpholine, and EDC.
View Article and Find Full Text PDFJ Phys Chem B
January 2025
Departamento de Química Analítica, Química Física e Ingeniería Química, Universidad de Alcalá, Alcalá de Henares, Madrid E-28871, Spain.
The retinal Schiff base is a chromophore of significant biological relevance, as it is responsible for capturing sunlight in rhodopsins, which are photoactive proteins found in various living organisms. Additionally, this chromophore is subjected to various mechanical forces in different proteins, which alter its structure and, consequently, its properties. To thoroughly understand the mechanical response limits of the retinal excitation energy, a simple first-order formalism has been developed to quantify the chromophore's optimal mechanical response to applied external forces (on the order of tens of pN).
View Article and Find Full Text PDFCarbohydr Polym
March 2025
Department of Chemistry, Faculty of Science (boys), Al-Azhar University, 11884 Nasr City, Cairo, Egypt.
This study aims to enhance the antimicrobial properties of chitosan through preparing novel chitosan Schiff bases via coupling with 4-formylphenyl 2,3-dioxo-1,2,3,4-tetrahydroquinoxaline-6-sulfonate (B5) where, different molar ratios of B5 were used to prepare various Schiff bases with chitosan, resulting in Schiff bases coded as d5, d6, d7, and d8, respectively. The modified chitosan samples (d5, d6, d7, and d8) showed reduced crystallinity and improved thermal stability. The crystallinity index of unmodified chitosan was 64 %, which decreased to 59, 55.
View Article and Find Full Text PDFRSC Adv
January 2025
Department of Life Science and Agriculture, Zhoukou Normal University Zhoukou Henan 466001 China
This study reports a green, multi-component synthesis of 2-aminoimidazole-linked quinoxaline Schiff bases using a novel superparamagnetic acid catalyst. The catalyst consists of sulfo-anthranilic acid (SAA) immobilized on MnCoFeO@alginate magnetic nanorods (MNRs), achieving high SAA loading (1.8 mmol g) and product yields (91-97%).
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