129580-63-8Relevant articles and documents
Crystal and Molecular Structures of Asymmetric cis- and trans-Platinum(II/IV) Compounds and Their Reactions with DNA Fragments
Talman, Eduard G.,Brüning, Wolfgang,Reedijk, Jan,Spek, Anthony L.,Veldman, Nora
, p. 854 - 861 (2008/10/09)
The asymmetrically substituted platinum(II) complexes cis-Pt(NH3)(c-C5H11NH2)Cl 2 and trans-Pt(NH3)(c-C6H11-NH2)Cl 2 have been synthesized and their crystal structures have been determined. Crystals of cis-Pt(NH3)(c-C6H11NH2)Cl 2 (1) are orthorhombic, space group Pbca (no. 61) with a = 10.1994(12), b = 10.494(2), c = 18.826(2) ?, Z = 8. The structure refinement converged to R1 = 0.0518 and wR2 = 0.1143. Crystals of trans-Pt(NH3)(c-C6H11NH2)Cl 2 (2) are monoclinic, space group P21/c (no. 14) with a = 12.141(3), b = 6.0965(9), c = 19.864(3) ?, β= 118.71(2)°, Z = 4. The structure refinement converged to R1 = 0.0711 and wR2 = 0.1846. In addition, the Pt(IV) analogues with axial hydroxide ligands have been synthesized. Also the corresponding bis(carboxylato)-platinum(IV) compound of formula trans,cis,cis-Pt(NH3)(c-C6H11NH 2)Cl2(OOCCH3)2 has been obtained by conversion of the hydroxide with acetic anhydride. Reactions of these platinum complexes with 9-methylhy-poxanthine and guanosine-5′-monophosphate (5′-GMP) have been studied in significant detail. The course of the reactions was followed by NMR spectroscopy, and 1H and 195Pt techniques were used to identify the formation of the products. It was found that the Pt(II) compounds easily react with the bases at the N7 position, whereas the Pt(IV) compounds react very slowly (for trans,cis,cis-Pt(NH3)(c-C6H11NH 2)Cl2(OOCCH3)2) or not at all (for trans,trans,trans-Pt(NH3)(c-C6H11NH 2)Cl2(OH)2). Only in the presence of glutathione does a reaction of the latter with 5′-GMP takes place. In this case a major product was found to be the reduced trans-Pt(II) complex with one molecule of 5′-GMP and one molecule of S-bonded glutathione.
Studies on the oral anticancer drug JM-216: Synthesis and characterization of isomers and related complexes
Barnard, Christopher F. J.,Vollano, Jean F.,Chaloner, Penny A.,Dewa, Shaliza Z.
, p. 3280 - 3284 (2008/10/09)
The complex cis,trans,cis-[PtCl2(OAc)2NH3(c-C 6H11NH2)] (JM-216) is currently undergoing clinical evaluation as an antitumor agent. In support of characterization and analysis of this complex a study of its isomers and other complexes [PtClm(OAc)4-mNH3(c-C6H 11NH2)] (m = 0-4) has been undertaken. The complexes have been obtained by a variety of synthetic routes which now extend the scope for the preparation of platinum(IV) antitumor complexes. As platinum(IV) complexes are very stable to substitution in the absence of catalysis, use has been made of both light and base catalysis to promote substitution. Oxidative addition to platinum(II) using hypervalent iodine reagents has also been used. The stereochemistry of the complexes has been confirmed by spectroscopic studies, primarily NMR including natural abundance 15N NMR spectroscopy.