title: Preparation, characterization, and antitumor activity of new cisplatin analogues with 1-methyl-4-(methylamino)piperidine: crystal structure of [PtII(1-methyl-4-(methylamino) piperidine)(oxalate)].
abstract: A series of new platinum(II) complexes of the type [Pt(II)(mmap)X] (where mmap, 1-methyl-4-(methylamino)piperidine and X, 1,1-cyclobutanedicarboxylato (CBDCA), oxalato, malonato, methylmalonato, dimethylmalonato, ethylmalonato, diethylmalonato or 2,3-naphthalene dicarboxylato (NDCA)) have been synthesized and characterized by elemental analysis, infrared (IR), and 13C and 195Pt nuclear magnetic resonance (NMR) spectroscopy. The crystal structure of the analogue [Pt(II)(mmap)(oxalate)] was determined using the single crystal X-ray diffraction method. Based upon a total of 4964 collected reflections, we determined that the compound crystallizes in the monoclinic space group P2(1)/c (with a=11.890(2) A, b=9.6695(19) A, c=9.875(2) A, beta=102.03(3) degrees, Z=4, and R=0.0428). In this complex, platinum has a slightly distorted square planar geometry with the two adjacent corners being occupied by two nitrogen atoms of the mmap ligand, whereas the remaining cis positions are occupied by two oxygen atoms of the oxalate molecule. The mmap ligand is in a boat conformation and forms six-membered chelating rings as well as the oxalate molecule forms five-membered chelating rings with platinum. The complexes were evaluated for their cytotoxic potential against the sensitive A2780 tumor model and cisplatin-resistant clone derived in vitro from potential cells.
authors.affiliation: Department of Experimental Therapeutics, Box 353, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA.
authors.forename: Uday
authors.initials: U
authors.lastname: Mukhopadhyay
authors.forename: John
authors.initials: J
authors.lastname: Thurston
authors.forename: Kenton H
authors.initials: KH
authors.lastname: Whitmire
authors.forename: Zahid H
authors.initials: ZH
authors.lastname: Siddik
authors.forename: Abdul R
authors.initials: AR
authors.lastname: Khokhar
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D002945:Cisplatin / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology*; D018360:Crystallography, X-Ray; D004354:Drug Screening Assays, Antitumor; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D002945:Cisplatin