Several C-4 carbon-substituted analogues of podophyllotoxin, 1, were prepared by treatment of 1 with allyltrimethylsilane or trimethylsilylcyanide in the presence of boron trifluoride etherate. Alternatively, carbon substituents were introduced via additions to the carbobenzyloxy-protected C-4′-dimethylated podophyllotoxone. These 4′-dimethylated derivatives showed promising in vitro antitumour activity and were equally active against human colon cell line HT116 and two multidrug resistant cell lines. The alcohol 6 was evaluated in vivo but was found to be inactive. Key words: podophyllotoxin analogues, podophyllotox-4-one, C4 carbon substituted podophyllotoxins.
通过使用烷基三甲基
硅烷或三甲基
硅氰化物在
三氟化硼醚化剂存在下处理1,制备了几种C-4碳取代的
鬼臼毒素类似物。另外,通过对碳苯甲氧基保护的C-4'-二甲基鬼臼毒酮进行加成反应引入了碳取代基。这些4'-二甲基衍
生物在体外显示出有希望的抗肿瘤活性,并且对人类结肠
细胞系HT116和两种多药耐药
细胞系同样有效。
醇类化合物6在体内评估后未表现出活性。关键词:
鬼臼毒素类似物,
鬼臼毒素-4-酮,C4碳取代
鬼臼毒素。