Synthesis, crystal structure and evaluation of the cytotoxic, antimicrobial activity of some S- and N-derivatives of 5-phenyl-1,2,4-triazole-2,4-dihydro-3-thione

In this work, we report the synthesis of several S- and N-derivatives of 5-phenyl-1,2,4-triazole-2,4-dihydro-3-thione (3–6). Methods for the preparation of these compounds were based on the alkylation and aminomethylation reactions of triazolethione (2). The target products were obtained in high (85–98%) yield. The structures of the synthesized compounds were confirmed by IR, ¹H and ¹³C NMR spectroscopy, mass spectrometry, and selective X-ray diffraction analysis. All compounds were tested in vitro against four human cancer cells (HeLa, HBL-100, HEp-2, CCRF-CEM), gram-positive (Staphylococcus aureus, Bacillus subtilis) and gram-negative bacteria (Escherichia coli, Pseudomonas aeruginosa), as well as the opportunistic fungus Candida albicans.