A review on development of bio-active thiosemicarbazide derivatives: Recent advances

Synthesis and Antibacterial Activity of New Azole, Diazole and Triazole Derivatives Based on p-Aminobenzoic Acid

The p-aminobenzoic acid was applied for the synthesis of substituted 1-phenyl-5-oxopyrrolidine derivatives containing benzimidazole, azole, oxadiazole, triazole, dihydrazone, and dithiosemicarbazide moieties in the structure. All the obtained compounds were evaluated for their in vitro antimicrobial activity against Staphylococcus aureus, Bacillus cereus, Listeria monocytogenes, Salmonella enteritidis, Escherichia coli, and Pseudomonas aeruginosa by using MIC and MBC assays. This study showed a good bactericidal activity of γ-amino acid and benzimidazoles derivatives. The antimicrobial activity of the most promising compounds was higher than ampicillin. Furthermore, two benzimidazoles demonstrated good antimicrobial activity against L. monocytogenes (MIC 15.62 µg/mL) that was four times more potent than ampicillin (MIC 65 µg/mL). Further studies are needed to better understand the mechanism of the antimicrobial activity as well as to generate antimicrobial compounds based on the 1-phenyl-5-oxopyrrolidine scaffold.

Structural investigation of N-[2-(4-fluoro-3-phen-oxy-benzo-yl)hydrazinecarbo-thio-yl]benzamide and N-[2-(4-fluoro-3-phen-oxy-benzo-yl)hydrazinecarbo-thio-yl]-4-meth-oxy-benzamide

The compound N-[2-(4-fluoro-3-phen-oxy-benzo-yl)hydrazinecarbo-thio-yl]benzamide, C21H16FN3O3S, crystallizes in the monoclinic centrosymmetric space group P21/c and its mol-ecular conformation is stabilized via an intra-molecular N-H⋯O hydrogen bond. The corresponding para-meth-oxy derivative, namely, N-[2-(4-fluoro-3-phen-oxy-benzo-yl)hydrazinecarbo-thio-yl]-4-meth-oxy-benzamide, C22H18FN3O4S, crystallizes in the monoclinic centrosymmetric space group C2/c. The supra-molecular network mainly comprises N-H⋯O, N-H⋯S and C-H⋯O hydrogen bonds, which contribute towards the formation of the crystal structures for the two mol-ecules. The different inter-molecular inter-actions have been further analysed using Hirshfeld surface analysis and fingerprint plots.