Platinum-based antitumor drugs containing enantiomerically pure α-trifluoromethyl alanine as ligand

Synthetic amino acids such as fluorinated R-amino acids are currently actively investigated for their biological activity. Herein, we report on the synthesis and characterization of platinum complexes containing an N,O-chelated pure enantiomer of R-trifluoromethylalanine (R-Tfm- Ala). The compounds are either anionic, K[PtCl2(R-Tfm-Ala)], or cationic, [PtAm2(R-Tfm-Ala)]- (NO3) (Am2 ) (NH3)2, ethylendiamine (en), 1,10-phenanthroline (phen), and 2,9-dimethyl-1,10- phenanthroline (Me2phen)). All complexes are highly soluble in water and have been fully characterized by NMR spectroscopy. In vitro cytotoxicity assays on different human tumor cell lines have been performed on some of the isolated compounds. [Pt(NH3)2(R-Tfm-Ala)] with R configuration of the amino acid proved to have an activity comparable to that of the reference compound cisplatin. Flow cytometric analysis on NCI-H460 tumor cells (absence of G2/M arrest, which instead is observed in the case of cisplatin) suggests a mechanism of action different from that of cisplatin.