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Ru(arene) compounds have many desirable features making them promising candidates for further development in anticancer drug research. While a lot of emphasis has been placed on the modification of the ancillary ligands, there are not many examples of arene ligands bearing functional groups. Herein, we report the preparation of [Ru(arene)(8-oxyquinolinato)Cl] complexes with the arene being a protected form of the amino acid l-phenylalanine and 8-oxyquinolinato ligand substituted with halogens. With this approach we aimed to alter the pharmacological properties of the complexes and address issues with the aqueous solubility of the analogous p-cymene complexes. The complexes were shown to be stable in DMSO and water and reacted readily with l-histidine and 9-ethylguanine as protein and DNA models, respectively. Assaying the antiproliferative activity in cancer cells gave IC 50 values in the low μM range. While the lipophilicity of the p-cymene analogues correlated well with their in vitro cytotoxicity, the potency of the complexes with the l-phenylalanine-derived arene was independent of lipophilicity.

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Making organoruthenium complexes of 8-hydroxyquinolines more hydrophilic: impact of a novel <scp>l</scp>-phenylalanine-derived arene ligand on the biological activity

Making organoruthenium complexes of 8-hydroxyquinolines more hydrophilic: impact of a novel l-phenylalanine-derived arene ligand on the biological activity