Synthesis and Biological Evaluation of Novel A-Ring Modified Hexacyclic Camptothecin Analogues
作者:Dae-Kee Kim、Do Hyun Ryu、Ju Young Lee、Namkyu Lee、Young-Woo Kim、Jae-Sun Kim、Kieyoung Chang、Guang-Jin Im、Tae-Kon Kim、Won-Son Choi
DOI:10.1021/jm0004751
日期:2001.5.1
Eleven A-ring modified hexacyclic analogues of camptothecin (CPT) containing a 1,4-oxazine ring were synthesized from 10-hydroxycamptothecin (11a) and 7-ethyl-10-hydroxycamptothecin (3) (SN-38) in four to five steps and were subjected to the biological tests such as cytotoxicity, topoisomerase I (Topo I) inhibitory activity, acetylcholinesterase (AChE) inhibition, and stability in human plasma. Four
由10-羟基喜树碱(11a)和7-乙基-10-羟基喜树碱(3)(SN-38)分四到五步合成11个含有1,4-恶嗪环的喜树碱(APT)修饰的六环类似物(CPT)并进行了生物学测试,例如细胞毒性,拓扑异构酶I(Topo I)抑制活性,乙酰胆碱酯酶(AChE)抑制以及在人血浆中的稳定性。四种化合物15a,15b,16a和16c的效力比拓扑替康高约2倍,对人癌细胞系A549,H128,WiDr,MKN45,SK-OV-3和SK-BR-3的效力相当于CPT。在体外,即使活性最高的化合物15b的效力略低于SN-38。Topo I抑制这些化合物的效力与其细胞毒性显示出相对良好的相关性。大多数化合物的AChE抑制活性比CPT(23 +/- 5%)或拓扑替康(20 +/- 4%)弱(9 +/- 2至20 +/- 3%),与SN-38( 13 +/- 2%),表明它们可能对引起早期腹泻影响不大。这些化合物的内