Synthesis and Antitumor Activity of 20(S)-Camptothecin Derivatives: A-Ring Modified and 7,10-Disubstituted Camptothecins.
作者:Seigo SAWADA、Shun-ichi MATSUOKA、Ken-ichiro NOKATA、Hiroshi NAGATA、Tomio FURUTA、Teruo YOKOKURA、Tadashi MIYASAKA
DOI:10.1248/cpb.39.3183
日期:——
20(S)-Camptothecin derivatives having nitro, amino, chloro, bromo, hydroxyl and methoxyl groups in the A-ring were synthesized. B-Ring hydrogenated camptothecin (2a) was converted into 10-hydroxycamptothecin (6e) by treatment with lead tetraacetate in trifluoroacetic acid. 10-Substituted derivatives (6) were obtained by a photoreaction of N-oxides (9). The cytotoxicity o the A-ring modified camptothecins was evaluated against KB cells in vitro and leukemia L1210 in mice. 7-Ethyl-10-hydroxycamptothecin (6i) was identified as a potential derivative for further modification.
在A环上具有硝基、氨基、氯、溴、羟基和甲氧基的20(S)-喜树碱衍生物被合成出来。通过在三氟乙酸中用四乙酸铅处理,B环氢化的喜树碱(2a)被转化为10-羟基喜树碱(6e)。通过N-氧化物(9)的光反应得到了10-取代的衍生物(6)。对A环修饰的喜树碱的细胞毒性进行了体外KB细胞和小鼠中的白血病L1210的评估。鉴定出7-乙基-10-羟基喜树碱(6i)作为一个有潜力的衍生物,可进一步进行修饰。