Synthesis, Crystal Structure, DFT Study and Antifungal Activity of 4-(5-((4-Bromobenzyl) thio)-4-Phenyl-4H-1,2,4-Triazol-3-yl)pyridine

Discovery of Substituted 2-oxoquinolinylthiazolidin-4-one Analogues as Potential EGFRK Inhibitors in Lung Cancer Treatment

PURPOSE

Cancer is the second leading cause of death globally and is responsible for an estimated 9.6 million deaths in 2018. Globally, about 1 in 6 deaths is due to cancer and the chemotherapeutic drugs available have high toxicity and have reported side effects hence, there is a need for the synthesis of novel drugs in the treatment of cancer.

METHODS

The current research work dealt with the synthesis of a series of 3-(3-acetyl-2-oxoquinolin-1-(2H)-yl-2-(substitutedphenyl)thiazolidin-4-one (Va-j) derivatives and evaluation of their in-vitro anticancer activity. All the synthesized compounds were satisfactorily characterized by IR and NMR data. Compounds were further evaluated for their in-vitro anticancer activity against A-549 (lung cancer) cell lines. The in-vitro anticancer activity was based upon the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide (MTT) assay method.

RESULTS

The synthesized compounds exhibited satisfactory anticancer properties against the A-549 cell line. The compound (VH): showed the highest potency amongst the tested derivatives against the A-549 cell line with IC50 values of 100 µg/ml respectively and was also found to be more potent than Imatinib (150 µg/ml) which was used as a standard drug. Molecular docking studies of the titled compounds (Va-j) were carried out using AutoDock Vina/PyRx software. The synthesized compounds exhibited well-conserved hydrogen bonds with one or more amino acid residues in the active pocket of the EGFRK tyrosine kinase domain (PDB 1m17).

CONCLUSION

Among all the synthesized analogues, the binding affinity of the compound (Vh) was found to be higher than other synthesized derivatives and a molecular dynamics simulation study explored the stability of the docked complex system.

Crystal structure of 2-((4-phenyl-5-(pyridin-4-yl)-4H-1,2,4-triazol-3-yl)thio)acetonitrile, C15H11N5S

C15H11N5S, orthorhombic, Pbca (no. 61), a = 9.7864(2) Å, b = 15.5709(3) Å, c = 18.7774(4) Å, V = 2861.36(10) Å3, Z = 8, R gt (F) = 0.0485, wR ref (F 2) = 0.1390, T = 296.15 K.

Synthesis, Crystal Structure and Bioactivities of N-(5-(4-chlorobenzyl)-1,3,5-Triazinan-2-Ylidene)Nitramide

The compound N-(5-(4-chlorobenzyl)-1,3,5-triazinan-2-ylidene)nitramide (C10H12ClN5O2, M = 269.70) was synthesized and structurally confirmed by 1H NMR, 13C NMR, HRMS and single-crystal x-ray diffraction. The crystal belongs to the monoclinic system with space group P21/c. The title compound consisted of a benzene ring and a 1,3,5-triazine ring. All carbon atoms in the benzene ring were nearly coplanar with a dihedral (C6–C5–C10 and C7–C8–C9) angle of 1.71°and all non-hydrogen atoms of the 1,3,5-triazine ring were not planar, but exhibited a half-chair conformation. The crystal structure was stabilized by a strong intramolecular hydrogen bonding interaction N(3)–H(3)···O(2) and three intermolecular hydrogen bonding interactions, N(2)–H(2)···O(1), N(2)–H(2)···N(4) and N(3)–H(3)···Cl(1). The preliminary bioassay showed that the title compound showed not only aphicidal activity against Sitobion miscanthi (inhibition rate: 74.1%) and Schizaphis graminum (77.5%), but also antifungal activities against Pythium aphanidermatum (62.0%). These results provide valuable guidelines for the design and synthesis of novel aphid control agents and fungicides.

Two Cu(ii)-triadimenol complexes as potential fungicides: synergistic actions and DFT calculations

Two Cu(ii) complexes, namely, [CuL₄(H₂O)₂]·2NO₃·2CH₃OH 1 and [CuL₂(CH₃COO)₂] 2, (L = (1S,2R)-1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)butan-2-ol, triadimenol, a commercial 1,2,4-triazole pesticide) were synthesized and characterized by elemental analysis, IR spectra, UV-Vis spectra and single crystal X-ray diffraction. Crystal structural analysis shows that the different types of salts (copper acetate is covalent, while copper nitrate is ionic) contribute to different crystal structures: complex 1 consists of one copper cation, four ligands, two coordinated water molecules, two free nitrate anions and two uncoordinated methanol molecules. Complex 2 is composed of one copper cation, two ligands and two acetate anions, without free molecules. The two complexes and the ligand triadimenol were also screened for antifungal activities against four selected fungi. The antifungal results reveal that both the complexes show better bioactivities in comparison with L, and that complex 1 has higher bioactivities than complex 2. To elaborate the reasons of the enhanced bioactivities after complexation, the interaction levels between Cu²⁺ cation and triadimenol, as well as the density functional theory (DFT) method were carried out. The results indicate that three factors made the antifungal activities stronger after forming Cu(ii) complexes: new active site of copper cation, synergic interactions between Cu²⁺ cation and L, and improved penetration of the metal complexes into the lipid membranes.

Two Cu(ii) complexes of triadimenol show greater antifungal activities than the ligand triadimenol. Moreover, the synergistic interactions and DFT calculations were both carried out to elucidate the reasons for the enhanced bioactivities.

Two novel Co(ii) and Ni(ii) complexes of tebuconazole with enhanced antifungal activities

Controlled release studies and theoretical investigations on two complexes based on tebuconazole were carried out to explain their increased antifungal activities.

Crystal structure of 4-(5-((2-methylbenzyl)thio)-4-phenyl-4H-1,2,4-triazol-3-yl)pyridine, C21H18N4S

C21H18N4S, monoclinic, P21/c (no. 14), a = 18.264(2) Å, b = 11.6302(14) Å, c = 8.9289(10) Å, β = 101.683(7)°, V = 1857.3(4) Å3, Z = 4, R gt (F) = 0.0435, wR ref(F2 ) = 0.1122, T = 296(2) K.

Design, Synthesis, DFT Study and Antifungal Activity of Pyrazolecarboxamide Derivatives

A series of novel pyrazole amide derivatives were designed and synthesized by multi-step reactions from phenylhydrazine and ethyl 3-oxobutanoate as starting materials, and their structures were characterized by NMR, MS and elemental analysis. The antifungal activity of the title compounds was determined. The results indicated that some of title compounds exhibited moderate antifungal activity. Furthermore, DFT calculations were used to study the structure-activity relationships (SAR).