New hydrazone derivatives: synthesis, characterization, carbonic anhydrase I-II enzyme inhibition, anticancer...

A new series of hydrazone derivatives (1a-1l) were prepared from a condensation reaction between different hydrazide derivatives and 3-formylbenzoic acid. Through the use of several spectral techniques, such as ¹H-NMR, ¹³C-NMR, and elemental analysis, the structures of the compounds were clarified. The crystal structure of compound 1d was obtained by single-crystal X-ray crystallography. They were found to have inhibitory effects on the anticancer potentials and human carbonic anhydrase isoforms I and II. Compound 1d was found to be the strongest inhibitor, with IC₅₀ values of 0.133 µM against hCA I. Also, compound 1l showed the highest inhibitory activity with IC₅₀ values of 3.244 µM against hCA II. Moreover, their cytotoxic effects on rat glioma cell and colon adeno carcinoma cell lines were evaluated. According to the cytotoxicity results, compounds 1j and 1l exhibited the highest cytotoxicity on the HT29 cell, while compounds 1e, 1g, and 1l showed the strongest cytotoxic effect on C6 cell line. Compound 1l, which carries the methoxy substituent at the 3^rd position on the phenyl ring, was effective against both cancer cells and showed the highest inhibitory effect on hCA II. The ADME/T properties and molecular docking of the molecules with the highest activity were examined.