Solvent-free synthesis of novel unsymmetric chenodeoxycholic acid bis thiocarbazone derivatives promoted by microwave irradiation and evaluation of their antibacterial activity
作者:Zhichuan Shi、Zhigang Zhao、Min Liu、Xiaohong Wang
DOI:10.1016/j.crci.2013.05.009
日期:2013.11
Résumé Eleven new non-symmetric chenodeoxycholic acid bis thiocarbazones were efficiently synthesized via the condensation of steroidal diketones (methyl (5β)-3,7-dioxocholan-24-oate) and substituted benzaldehyde thiocarbohydrazones by means of microwave irradiation. Compared with the conventional heating method, the yields were increased from 31–58% to 80–89% and the reaction times were reduced from 420–520 min to 5.0–7.5 min. The structures of these novel compounds were characterized by spectral data and elemental analysis. Four compounds (7a, 7c, 7f and 7g) possess excellent activity against Bacillus subtilis and Staphylococcus aureus.
摘要
通过微波辐射法,将类固醇二酮(甲基(5β)-3,7-二氧胆酸-24-酯)与取代苯甲醛硫脲氨基酸的缩合,成功合成了十一种新的非对称氟脱氧胆酸双硫氨基酸。与传统加热方法相比,产率从31–58%提高至80–89%,反应时间从420–520分钟缩短至5.0–7.5分钟。这些新化合物的结构通过光谱数据和元素分析进行了表征。四种化合物(7a、7c、7f和7g)对枯草芽孢杆菌和金黄色葡萄球菌表现出优异的活性。