Diaminocarbene Complexes of Palladium(II) Containing 2-Aminooxazole and 2-Aminothiazole Heterocyclic Ligands as Potential Antitumor Agents

A new diaminocarbene cis -palladium(II) complex containing a 2-aminobenzoxazole ligand was synthesized by reacting cis -[PdCl 2 (CNCy) 2 ] and 2-aminobenzoxazole. The structure and composition of the obtained complex were proven by NMR spectroscopy and high-resolution mass spectrometry. The cytotoxicities of the obtained complex and structurally similar palladium(II) complexes containing a 2-aminothiazole ligand were tested against human cancer cells of various histogenesis (MCF-7, HL60, HeLa, DLD1, A431). The activities of several complexes against cancer cells were higher than those of the reference drug cisplatin and the free ligands, i.e., 2-aminooxazole and substituted 2-aminothiazoles.