title: Platinum(II) complexes containing long-chain hydrophobic N-alkyl-diamine ligands: synthesis, characterization, molecular modeling, and cytotoxic activity.
abstract: A series of novel platinum(II) complexes derived from N-alkyl-ethanediamine and N-alkyl-propanediamine ligands were prepared and characterized. These complexes contain a long chain aliphatic diamine where the carbon length is variable and present a hydroxyl group in two different positions. The complexes with the ethanediamine derivatives were prepared from K(2)PtCl(4). Interestingly, the propanediamine derivatives did not react well with this platinum salt under the experimental conditions normally employed and could only be obtained from the more reactive K(2)PtI(4). A theoretical molecular modeling study was performed to understand this difference in reactivity and it showed that the conformation around the diamine plays an important role in the ring closure step of complex formation. The complexes had their cytotoxicity investigated in B16F1, CT26, B16F10, and MDA cell lines. Some of them demonstrated superior activity when compared to cisplatin and carboplatin. We were also able to confirm a structure-activity relationship between cytotoxicity and carbon chain length.
authors.affiliation: Departamento de Química, Universidade Federal de Juiz de Fora, 36036-900 Juiz de Fora, MG, Brazil.
authors.forename: Tatiane Teixeira
authors.initials: TT
authors.lastname: Tavares
authors.forename: Glaucia Franco
authors.initials: GF
authors.lastname: Teixeira
authors.forename: Carolina Mauad
authors.initials: CM
authors.lastname: Lopes
authors.forename: Willian Tássio Gomes
authors.initials: WT
authors.lastname: Novato
authors.forename: Heveline
authors.initials: H
authors.lastname: Silva
authors.forename: Míriam Teresa Paz
authors.initials: MT
authors.lastname: Lopes
authors.forename: Mauro Vieira
authors.initials: MV
authors.lastname: De Almeida
authors.forename: Richard Michael
authors.initials: RM
authors.lastname: Grazul
authors.forename: Hélio Ferreira
authors.initials: HF
authors.lastname: Dos Santos
authors.forename: Ana Paula Soares
authors.initials: AP
authors.lastname: Fontes
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D045744:Cell Line, Tumor; D003603:Cytotoxins / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D005029:Ethylenediamines / Q000737:chemistry; D006801:Humans; D051379:Mice; D009944:Organoplatinum Compounds / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D010984:Platinum / Q000737:chemistry*
chemical_list: D000970:Antineoplastic Agents; D003603:Cytotoxins; D005029:Ethylenediamines; D009944:Organoplatinum Compounds; D010984:Platinum; C031234:ethylenediamine