Synthesis and DNA binding properties of novel benzo[b]isoquino[2,3-h]-naphthyridines
作者:Oliver Koepler、Stefania Mazzini、Maria Cristina Bellucci、Rosanna Mondelli、Angelika Baro、Sabine Laschat、Marc Hotfilder、Christophle Viseur、Wolfgang Frey
DOI:10.1039/b503281d
日期:——
Several benzo[b]isoquino[2,3-h]-naphthyridines have been prepared via formal hetero-Diels Alder reaction of N-aryl imines as a key step. These compounds have different side chains at C-11, and a cis or trans configuration at the C-8a,C-14a ring junction. Binding constants for the interaction with oligonucleotides and polynucleotides were determined by UV absorption and melting experiments. NMR experiments (NOE) revealed that the cis isomers, showing a slightly folded structure, preferentially bind to the minor groove of AT-rich oligomers. In contrast, the trans isomers prefer the CG-rich sequences, leading to cap-complexes with the isoquinoline moiety stacked at the top of the double helix, in agreement with the flatter shape, and with a preference for the 3′-terminals, as found for camptothecins. Models of the complexes were built up by molecular dynamics (MD) calculations, by using the inter-proton distances derived from the NOE values. Cytotoxicity assays against human Ewing sarcoma cell lines RD-ES and CAD-ES1 were performed.
作为一个关键步骤,通过 N-芳基亚胺的正式杂 Diels Alder 反应制备出了多种苯并[b]异喹啉并[2,3-h]萘啶类化合物。这些化合物在 C-11 处有不同的侧链,在 C-8a,C-14a 环交界处有顺式或反式构型。与寡核苷酸和多核苷酸相互作用的结合常数是通过紫外线吸收和熔化实验测定的。核磁共振实验(NOE)显示,顺式异构体显示出轻微的折叠结构,优先与富含 AT 的寡核苷酸的小沟结合。与此相反,反式异构体更倾向于富含 CG 的序列,从而形成异喹啉分子堆叠在双螺旋顶端的帽状复合物,这与扁平的形状一致,并且更倾向于喜树碱的 3′-末端。通过分子动力学(MD)计算,利用从 NOE 值得出的质子间距离建立了复合物的模型。对人类尤文肉瘤细胞系 RD-ES 和 CAD-ES1 进行了细胞毒性试验。