Structural Diversity of Copper(II) Complexes with N-(2-Pyridyl)Imidazolidin-2-Ones(Thiones) and Their in Vitro Antitumor Activity
作者:Łukasz Balewski、Franciszek Sączewski、Patrick Bednarski、Maria Gdaniec、Ewa Borys、Anna Makowska
DOI:10.3390/molecules191017026
日期:——
Six series of structurally different mono- and binuclear copper(II) complexes 5–10 were obtained by reacting N-(2-pyridyl)imidazolidin-2-ones (1a–l), N,N'-bis(2-pyridyl)imidazolidin-2-ones (2a,b), N-acyl-N'(2-pyridyl)imidazolodin-2-ones (3a–j) and N-(2-pyridyl)imidazolidine-2-thiones (4a–g) with copper(II) chloride at an ambient temperature. The coordination modes of the complexes obtained were established by elemental analysis, IR spectroscopic data and single crystal X-ray diffraction studies. The in vitro cytotoxic activities of both the free ligands and copper(II) complexes were evaluated using a crystal violet microtiter plate assay on five human tumor cell lines: LCLC-103H, A-427, SISO, RT-4 and DAN-G. The free ligands 1–4 at concentration attainable in cancer cells of 20 μM showed no meaningful cytotoxic effect with cell viability in the range of 88%–100%. The most potent copper(II) complex of 1-(6-ethoxy-2-pyridyl)imidazolidin-2-one (6b) exhibited selective cytotoxicity against A-427 lung cancer cell line, while the complexes of 1-(5-methyl-2-pyridyl)imidazolidine-2-thione (5h) and 1-(4-tert-butyl-2-pyridyl)imidazolidine-2-thione (5j) showed cytostatic effect against a whole panel of five human tumor cell lines. In conclusion, the only complexes that showed remarkably increased activity in comparison to the free ligands were those obtained from N-(2-pyridyl)imidazolidine-2-thiones 4c and 4e substituted with alkyl group at position 4 or 5 of pyridine ring.
通过在常温下将N-(2-吡啶基)咪唑啉-2-酮(1a-l)、N,N'-双(2-吡啶基)咪唑啉-2-酮(2a,b)、N-乙酰基-N'-(2-吡啶基)咪唑啉-2-酮(3a-j)和N-(2-吡啶基)咪唑啉-2-硫酮(4a-g)与二价铜氯化物反应,得到了六系列结构不同的单核和双核铜(II)配合物5-10。通过元素分析、红外光谱数据和单晶X射线衍射研究确定了所得配合物的配位模式。利用紫外分光光度计在五种人肿瘤细胞系(LCLC-103H、A-427、SISO、RT-4和DAN-G)上评估了自由配体和铜(II)配合物的体外细胞毒活性。在癌细胞中可达到的20 μM浓度下,自由配体1-4未显示出有意义的细胞毒性,细胞存活率在88%-100%之间。1-(6-乙氧基-2-吡啶基)咪唑啉-2-酮(6b)的最强铜(II)配合物对A-427肺癌细胞系表现出选择性细胞毒性,而1-(5-甲基-2-吡啶基)咪唑啉-2-硫酮(5h)和1-(4-叔丁基-2-吡啶基)咪唑啉-2-硫酮(5j)的配合物对全部五种人肿瘤细胞系表现出细胞抑制作用。总之,与自由配体相比,显示出显著增强活性的唯一配合物是来自N-(2-吡啶基)咪唑啉-2-硫酮4c和4e的配合物,它们在吡啶环的4或5位上被烷基取代。