鬼臼类二芳醚农药的合成研究

鬼臼毒素(Podophyllotoxion)是从盾叶鬼臼(Podophyllum peltatum)和西藏鬼臼(P.emodi)等植物中提取分离的一种具有显著的抗肿瘤、抗病毒活性作用的活性成分,在我国资源丰富.西北农林科技大学无公害农药研究服务中心首次发现并报道了柏科圆柏属植物砂地柏的杀虫活性.从1999年以来,我们对该类植物进行了比较系统的研究,已证明鬼臼毒素(Podophyllotoxin)及脱氧鬼臼毒素(deoxypodophyllotoxin)为其重要的活性成分[1].基于在农药分子中引入二芳醚结构可以显著改善农药的理化性质和生物活性(如:提高光学稳定性、降低对哺乳动物的毒性,扩大生物活性谱等特点)[2],我们设计合成了含有鬼臼类二芳醚的十个新化合物,可望得到高效低毒的具有显著活性的农药[3],该类化合物结构经IR,1H NMR,13C NMR,ESI-MS,HRMS等所证实.其合成路线如下:     

新的依托泊苷衍生物作为细胞毒药物的设计, 合成和生物活性评价

Five novel compounds composed of etoposide and 5-fluorouracil derivatives joined by an ester linkage were prepared and evaluated for their antitumor potential. Most of these analogues have exhibited promising in vitro cytotoxic activity against cell cultures of murine leukaemia P-388 and human lung carcinoma A-549. The results presented herein challenged the long-standing structure-activity relationships, which proposed that a free 4＇-hydroxyl group is essential structural requirement for etoposide-like activity. And in addition, the 4＇-position was suggested to tolerate chemical modifications such as esterification. The preliminary testing results also indicated that the design and synthesis of these compounds were beneficial for therapeutic values of etoposide.