New palladium and platinum complexes with bioactive 3,5-diacetyl-1,2,4-triazol bis(4-cyclohexyl thiosemicarbazone) ligand: chemistry, antiproliferative activity and preliminary toxicity studies
作者:Ana I. Matesanz、Josefina Perles、Pilar Souza
DOI:10.1039/c2dt31199b
日期:——
The preparation and characterization of the new 3,5-diacetyl-1,2,4-triazol bis(4-cyclohexyl thiosemicarbazone) ligand, H55L11, is described. Treatment of H55L11 with K2PtCl4 gave the dinuclear complex [Pt(H3L1)]2, 1, but using MCl2(PPh3)2 where M = Pd or Pt, mononuclear complexes 2 and 3, of general formula [M(H3L1)PPh3], were obtained. Subsequent reaction of the [Pd(H3L1)PPh3] complex with PdCl2(PPh3)2 yielded a new dinuclear complex [(PPh3)Pd(H2L1)PdCl], 4. All compounds have been characterized by elemental analysis and FAB+ spectrometry and by IR and NMR spectroscopy. The molecular structures of mononuclear complexes 2 and 3 and dinuclear complex 4 have been determined by X-ray crystallography. The new compounds synthesized have been evaluated for antiproliferative activity in vitro against NCI-H460, HepG2, MCF-7, A2780 and A2780cisR human cancer cell lines. The cytotoxicity data suggest that the H55L11 ligand and [Pt(H3L1)]2, complex 1, may be endowed with important cytotoxic properties since they are capable of not only circumventing cisplatin resistance in A2780cisR but also exhibit antiproliferative activity in NCI-H460. The interactions of these compounds with calf thymus DNA were investigated by UV-vis absorption and a nephrotoxic study, in LLC-PK1 cells, has also been carried out.
本文介绍了新型 3,5-二乙酰基-1,2,4-三唑双(4-环己基硫代氨基甲酮)配体 H55L11 的制备和表征。用 K2PtCl4 处理 H55L11 可以得到双核络合物 [Pt(H3L1)]2、1,但使用 MCl2(PPh3)2(其中 M = Pd 或 Pt)可以得到通式为 [M(H3L1)PPh3] 的单核络合物 2 和 3。随后,[Pd(H3L1)PPh3] 复合物与 PdCl2(PPh3)2 反应,得到了新的双核复合物 [(PPh3)Pd(H2L1)PdCl],即 4。 所有化合物都通过元素分析和 FAB+ 光谱法以及红外光谱和核磁共振光谱法进行了表征。单核复合物 2 和 3 以及双核复合物 4 的分子结构已通过 X 射线晶体学确定。体外评估了合成的新化合物对 NCI-H460、HepG2、MCF-7、A2780 和 A2780cisR 人类癌细胞系的抗增殖活性。细胞毒性数据表明,H55L11 配体和[Pt(H3L1)]2 复合物 1 可能具有重要的细胞毒性特性,因为它们不仅能规避 A2780cisR 的顺铂抗性,还能在 NCI-H460 中表现出抗增殖活性。通过紫外-可见吸收研究了这些化合物与小牛胸腺 DNA 的相互作用,还在 LLC-PK1 细胞中进行了肾毒性研究。