Synthesis and Antitumor Activity of 20(S)-Camptothecin Derivatives. A-Ring-Substituted 7-Ethylcamptothecins and Their E-Rig-Modified Water-Soluble Derivatives.
作者:Takashi YAEGASHI、Seigo SAWADA、Hiroshi NAGATA、Tomio FURUTA、Teruo YOKOKURA、Tadashi MIYASAKA
DOI:10.1248/cpb.42.2518
日期:——
Twenty-six novel A-ring-modified 7-ethylcamptothecins (6) were synthesized by Friedlander's condensation of the chiral tricyclic ketone (5) with aminopropiophenones (4). The compounds substituted with fluorine at the 11 position showed strong cytotoxicity to KB and L1210 cells. The 11-fluoro derivatives also exhibited strong inhibitory activity on DNA topoisomerase I. Nine compounds 6 with four to ten times stronger cytotoxicity than that of camptothecin were selected and converted into water-soluble 17-O-acyl amide derivatives (8). Compounds 8e (10-Me, O-COCH2CH2SCH3) and 8f (11-F, O-COC2H5) showed activity towards Meth A in mice that was comparable to that of CPT-11, at lower doses than CPT-11.
合成了二十六种新型A环修饰的7-乙基喜树碱(6),通过Friedlander缩合反应,将手性三环酮(5)与氨基丙酮芳香化合物(4)进行反应。11位取代氟的化合物对KB细胞和L1210细胞表现出强烈的细胞毒性。11-氟衍生物在DNA拓扑酶I上的抑制活性也很强。选择了九种细胞毒性比喜树碱强四到十倍的化合物6,并将其转化为水溶性的17-O-酰胺衍生物(8)。化合物8e(10-甲基,O-COCH2CH2SCH3)和8f(11-氟,O-COC2H5)在小鼠中对Meth A的活性与CPT-11相当,且所需剂量低于CPT-11。