Table of Contents
Metal-Based Drugs
Volume 2 (1995), Issue 1, Pages 57-63
http://dx.doi.org/10.1155/MBD.1995.57

Synthesis and Characterization of New Ethylenediamine Platinum(IV) Complexes Containing Lipophilic Carboxylate Ligands

Anorganisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 270, Heidelberg D - 69120, Germany

Received 13 September 1994; Accepted 26 September 1994

Copyright © 1995 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A series of new ethylenediamine (en) platinum(IV) complexes of the type Pt(IV)enX2A2 , with X2= cyclobutane-1,1-dicarboxylato (CBDCA), dichloro or bis(decanoato) and A = acetato, dodecanoato, tetradecanoato, hexadecanoato, octadecanoato, adamantanecarboxylato (Ad) or , 12α -diformoxy--cholato (DFCA) were synthesized and characterized by elemental analysis, infrared and NMR (H1andC13) spectroscopic techniques. Previous platinum(IV) compounds were usually restricted to trans-dihydroxo or trans-dichloro platinum(IV) complexes. Recently trans-dicarboxylato platinum(IV) complexes with mainly acetate, trifluoracetate or short-chain carboxylate groups (<11 carbons) in the axial position have been described in the literature[1,2,3]. In this paper we report on the synthesis and characterization of a new class of ethylenediamine platinum(IV) compounds that have high lipophilic long-chain carboxylate ligands either in the axial or equatorial position. The platinum(IV) compounds with the lipophilic trans-carboxylate ligands in the axial position were prepared by acylation of the trans-dihydroxo platinum(IV) species using an acyl halide in the presence of pyridine. In contrast to previous publications[1] the yields were excellent (up to 94%!).