A new series of betulin derivatives containing one or two pharmacophores bearing an acetylenic and carbonyl function at the C-3 and/or C-28 positions has been synthesized and characterized by 1H- and 13C-NMR, IR, MS and elemental analyses. The crystal structure of 28-O-propynoylbetulin was determined by X-ray structural analysis. All new compounds, as well as betulin, were tested in vitro for their antiproliferative activity against human SW707 colorectal, CCRF/CEM leukemia, T47D breast cancer, and against murine P388 leukemia and Balb3T3 normal fibroblasts cell lines. Most of the compounds showed better cytotoxicity than betulin and cisplatin used as reference agent. 28-O-Propynoylbetulin was the most potent derivative, being over 500 times more potent than betulin and about 100 times more cytotoxic than cisplatin against the human leukemia (CCRF/CEM) cell line, with an ID50 value of 0.02 μg/mL.
一种新的含有一个或两个药效团的贝图林衍
生物已被合成,这些药效团在C-3和/或C-28位置上具有
炔烃和羰基功能。通过高分辨率的1H-NMR、13C-NMR、红外光谱、质谱以及元素分析对其进行了表征。28-O-
丙炔酰贝图林的晶体结构通过X射线结构分析确定。所有新的化合物以及贝图林在体外测试了其对人SW707结肠癌、CCRF/C
EM白血病、T47D乳腺癌及小鼠P388白血病和Balb3T3正常成纤维细胞株的抗增殖活性。大多数化合物的细胞毒性优于作为参考药物的贝图林和
顺铂。28-O-
丙炔酰贝图林是最有效的衍
生物,其活性比贝图林强超过500倍,对人白血病(CCRF/C
EM)细胞株的细胞毒性约为
顺铂的100倍,ID50值为0.02 μg/mL。