Synthesis and cytotoxicity of new platinum(IV) complexes of mixed carboxylates

• Published in: Journal of inorganic biochemistry 2003-08, Vol.96 (2), p.339-345
• Main Authors: Song, Rita, Park, Sun Young, Kim, Yeong-Sang, Kim, Youngmee, Kim, Sung-Jin, Ahn, Byung Tae, Sohn, Youn Soo
• Format: Article
• Language: English
• Subjects: Animals; Anticancer; Antineoplastic Agents - chemical synthesis; Antineoplastic Agents - pharmacology; Carboxylic Acids - chemical synthesis; Carboxylic Acids - pharmacology; Cell Survival - drug effects; Crystallography, X-Ray; Cytotoxicity; Guanosine Monophosphate - chemistry; Hydrophobic and Hydrophilic Interactions; Lipophilicity; Mice; Molecular Structure; Organometallic Compounds - chemical synthesis; Organometallic Compounds - pharmacology; Platinum - chemistry; Platinum(IV); Tumor Cells, Cultured
• ISSN: 0162-0134; 1873-3344
• DOI: 10.1016/S0162-0134(03)00149-1

In order to develop new antitumor platinum(IV) complexes with highly tuned lipophilicity, a series of (diamine)Pt(IV) complexes of the formula [Pt IV(dach)L 3L′] or [Pt IV(dach)L 2L″ 2] (dach= trans-(±)-1,2-diaminocyclohexane; L=acetato, propionato; L′=acetato, propionato, valerato or pivalato; L″=trifluoroacetato) have been synthesized by electrophilic substitution of the tris(carboxylato)hydroxoplatinum(IV) complexes, [Pt IV(dach)L 3OH] (L=acetato, propionato), with various carboxylic anhydrides such as acetic, trifluoroacetic, pivalic and valeric anhydrides. The present platinum(IV) complexes were fully characterized by means of elemental analyses, 1H NMR, mass and IR spectroscopies. The complexes 8 and 10, satisfying the appropriate range of lipophilicity (log P=0.18–1.54), exhibited high activity (ED 50, 5.1 and 1.3 μM, respectively) compared with other complexes, which implies that the lipophilicity is an important factor for the antitumor activity of this series of complexes.