Evaluation of in vitro anticancer, antimicrobial and antioxidant activities of new Cu(II) complexes derived from 4(3H)-quinazolinone: Synthesis, crystal structure and molecular docking studies

Present study describes synthesis of a series of Cu(II) metal complexes (C-1 - C-3) of bidentate Schiffbase ligands (L-1 - L-3) derived from the condensation reaction of 3-amino-2-methyl-4(3H)quinazolinone with 2-chlorobenzaldehyde, 4-bromobenzaldehyde and 2-nitrobenzaldehyde. The structural characterization of synthesized compounds has been analyzed on the basis of FT-IR, UV-Visible, 1 H NMR and mass spectroscopy. The orthorhombic structure of the L-3 is determined by X-ray crystallographic analysis. In silico analysis of all compounds against various protein targets prove to have better interaction parameters in case of c-MET and VEGFR, thus in accordance with the docking score, the colon cell line (HT-29) was selected for further in vitro analysis and the results revealed that L-3, C-1, C-2 and C-3 exhibit important anticancer activity when compared with the standard drug Adriamycin. Further, synthesized compounds have shown excellent activity against Gram-positive (Staphylococcus aureus) and Gram-negative pathogens (Escherichia coli) but exhibited poor activity against fungal strain. Antioxidant activity of the all compounds revealed that the complexes displayed a higher scavenging activity than the corresponding ligands. These studies reveal that the coordination of Cu(II) ion with mixed ligands play a vital role in the enhancement of the biological potential of the complexes. (C) 2021 Elsevier B.V. All rights reserved.