Synthesis and characterization of new pyrazole-based thiazoles

Development and radiosterilization of new hydrazono-quinoline hybrids as DNA gyrase and topoisomerase IV inhibitors: Antimicrobial and hemolytic activities against uropathogenic isolates with molecular docking study

This study aimed to synthesize new potent quinoline derivatives based on hydrazone moieties and evaluate their antimicrobial activity. The newly synthesized hydrazono-quinoline derivatives 2, 5a, 9, and 10b showed the highest antimicrobial activity with MIC values ≤1.0 μg/ml against bacteria and ≤8.0 μg/ml against the fungi. Further, these derivatives exhibited bactericidal and fungicidal effects with MBC/MIC and MFC/MIC ratio ≤4. Surprisingly, the most active compounds displayed good inhibition to biofilm formation with MBEC values ranging between (40.0 ± 10.0 - 230.0 ± 31.0) and (67.0 ± 24.0 - 347.0 ± 15.0) μg/ml against Staphylococcus aureus and Pseudomonas aeruginosa, respectively. The hemolytic assays confirmed that the hydrazono-quinoline derivatives are non-toxic with low % lysis values ranging from 4.62% to 14.4% at a 1.0 mg/ml concentration. Besides, compound 5a exhibited the lowest hemolytic activity value of ~4.62%. Furthermore, the study suggests that the hydrazono-quinoline analogs exert their antibacterial activity as dual inhibitors for DNA gyrase and DNA topoisomerase IV enzymes with IC₅₀ values ranging between (4.56 ± 0.3 - 21.67 ± 0.45) and (6.77 ± 0.4 - 20.41 ± 0.32) μM, respectively. Additionally, the recent work advocated that compound 5a showed the reference SAL at the ɣ-radiation dose of 10.0 kGy in the sterilization process without affecting its chemical structure. Finally, the in silico drug-likeness, toxicity properties, and molecular docking simulation were performed. Besides, the result exhibited good oral-bioavailability, lower toxicity prediction, and lower binding energy with good binding mode rather than the positive control.

Efficient Synthesis of New Benzofuran‐based Thiazoles and Investigation of their Cytotoxic Activity Against Human Breast Carcinoma Cell Lines

A new series of 1,3‐thiazole‐benzofuran derivatives was synthesized via heterocyclization of 2‐(1‐(6‐alkoxy‐4,7‐dimethoxybenzofuran‐5‐yl)ethylidene)‐2‐methyl‐2l4‐diazane‐1‐carbothioamides with hydrazonoyl halides. Also, 1‐(4,7‐dimethoxybenzofuran‐5‐yl)‐3‐phenylprop‐2‐en‐1‐one derivatives were used for synthesis of another series of 1,3‐thiazole‐pyrazole‐benzofuran. The structure of the newly synthesized products was elucidated via elemental analysis, spectral data, and alternative routes whenever possible. Seven new compounds were evaluated for their anticancer activity against the human breast carcinoma (MCF‐7) cell lines compared with doxorubicin drug. The results revealed that some new compounds showed promising anticancer activity.