Solvent-Free Synthesis, DNA-Topoisomerase II Activity and Molecular Docking Study of New Asymmetrically N,N'-Substituted Ureas
作者:Andressa Esteves-Souza、Claudio Rodrigues-Santos、Catarina Del Cistia、Daniel Silva、Carlos Sant'Anna、Aurea Echevarria
DOI:10.3390/molecules171112882
日期:——
A new series of asymmetrically N,N'-substituted ureas 20–25 was prepared using solvent free conditions, which is an eco-friendly methodology, starting with Schiff bases derived from cinnamaldehyde and p-substituted anilines, which are subsequently submitted to reduction reactions that afford the corresponding asymmetric secondary amines. All of the intermediates were prepared using solvent free reactions, which were compared to traditional methodologies. All of the reactions required a remarkably short amount of time and provided good yields when solvent free conditions were employed compared to other methodologies. The DNA-topoisomerase II-α (topo II-α) activity was evaluated in relaxation assays, which showed that all of the compounds inhibited the enzyme activity at 10 μM, except for urea 24. Furthermore, a molecular docking study indicated that the compounds 20–25 binding to the topo II-α are able to interact with the same binding site as the anticancer drug etoposide, suggesting that the ureas could inhibit the enzyme by the same mechanism of action observed for etoposide, which prevents re-ligation of the DNA strands.
采用无溶剂条件,以肉桂醛和p位取代的苯胺衍生的希夫碱为原料,经还原反应制得相应的非对称次级胺,进而合成了新系列非对称N,N'-取代的脲类化合物20–25。该方法是一种绿色环保的方法。所有中间体的制备均采用无溶剂反应,并与传统方法进行了比较。所有反应所需时间都极短,且在采用无溶剂条件时的产率普遍高于其他方法。通过松弛实验评估了这些化合物对DNA拓扑异构酶II-α(topo II-α)的活性。结果表明,除脲24外,所有化合物在10 μM浓度下均抑制酶活性。此外,分子对接研究显示,化合物20–25与topo II-α的结合位点与抗癌药物依托泊苷相同,这表明脲类化合物可能通过类似依托泊苷的机制抑制酶活性,即阻止DNA链的再连接。