[Et3NH][HSO4] catalyzed efficient synthesis of 5-arylidene-rhodanine conjugates and their antitubercular activity
作者:Dnyaneshwar D. Subhedar、Mubarak H. Shaikh、Laxman Nawale、Amar Yeware、Dhiman Sarkar、Bapurao B. Shingate
DOI:10.1007/s11164-016-2484-0
日期:2016.8
We have described a highly efficient, safer protocol for the synthesis of 5-arylidene-rhodanine conjugates catalyzed by Bronsted acidic ionic liquid [Et3NH][HSO4] in excellent yields. The protocol offers cost-effective, environmentally benign, solvent-free conditions and recycle–reuse of the catalyst. The synthesized 5-arylidene-rhodanine conjugates were characterized on the basis of 1H NMR, 13C NMR and HRMS spectral data. A series of 5-arylidene-rhodanine derivatives 3a–h, 4a–h were synthesized and evaluated for their in vitro antitubercular activity against dormant Mycobacterium tuberculosis H37Ra and M. bovis BCG strains. Moreover, compounds 3a, 3b, 3e, 3f, 3g, 3h and 4f exhibited good antitubercular activity and were also evaluated for anti-proliferative activity against MCF-7, A549 and HCT116 cell lines using modified MTT assay and found to be noncytotoxic. Compounds 3a–h and 4f were further screened for their antibacterial activity against four bacteria strains to assess their selectivity towards M. tuberculosis. Furthermore, in silico ADME prediction of all the tested compounds followed the criteria for orally active drug and, therefore, these compounds may have a good potential for eventual development as oral agents.
我们描述了一种高效、更安全的合成5-芳亚甲基-罗丹宁衍生物的方法,该方法采用布朗斯特酸性离子液体[Et3NH][HSO4]作为催化剂,产率极佳。该方案提供了成本效益高、环境友好、无溶剂的条件以及催化剂的回收再利用。合成的5-芳亚甲基-罗丹宁衍生物通过1H NMR、13C NMR和HRMS光谱数据进行了表征。合成了一系列5-芳亚甲基-罗丹宁衍生物3a–h、4a–h,并评估了它们对休眠的结核分枝杆菌H37Ra和牛分枝杆菌BCG株的体外抗结核活性。此外,化合物3a、3b、3e、3f、3g、3h和4f显示出良好的抗结核活性,并使用改良的MTT assay评估了对MCF-7、A549和HCT116细胞系的抗增殖活性,发现它们无细胞毒性。化合物3a–h和4f进一步筛选了它们对四种细菌株的抗菌活性,以评估它们对结核分枝杆菌的选择性。此外,所有测试化合物的计算机辅助ADME预测遵循口服活性药物的标准,因此,这些化合物可能具有作为口服药物开发的良好潜力。