The solvolysis of topotecan in alcohols and acetic anhydride
作者:Jiajun Li、Guolin Wang、Mengjie Dong、Qian Zhang
DOI:10.1016/j.bmcl.2011.02.080
日期:2011.4
Six derivatives of 10-hydroxycamptothecin were prepared via solvolysis of topotecan in corresponding alcohols and acetic anhydride. We attributed the specific reactivity of topotecan to the internal hydrogen-bonding between 10-hydroxy and the nitrogen atom in position 9. As a result the reaction underwent through an intermediate ortho-quionomethlide species to reach equilibrium. Bioactivity screening
tautomerism and solvolysis products in various solvents and conditions. Chemical stability was assessed in methanol and DMSO as compared to water, and the regioselectivity of the N‐ and O‐methylation was studied using various alkylatingagents. The reaction products of quaternization of the nitrogen atom and methylation of the oxygen atom were characterized by means of ESI MS, 1H/13C‐HMBC and ‐HSQCAD NMR.
拓扑替康 (TPT) 在临床上用作抗肿瘤剂 hycamtin™。正因为如此,它需要生物和化学上有用的信息可用。TPT 通过与带切口的 DNA 和拓扑异构酶 I 形成的共价复合物结合而起作用。由于插入单链切口和 TPT 抑制其重新连接,因此具有毒性作用。我们使用 NMR 来追踪各种溶剂和条件下的 TPT 动力学、互变异构和溶剂分解产物。与水相比,在甲醇和 DMSO 中评估了化学稳定性,并使用各种烷化剂研究了 N-和 O-甲基化的区域选择性。通过ESI MS、1H/13C-HMBC和-HSQCAD NMR表征氮原子季铵化和氧原子甲基化的反应产物。我们专注于 TPT 的 NMR 表征,预计其聚集、翻滚特性和分子内偶极相互作用将成为本文中描述的其他化合物的共同特征。这些特征还可用于追踪此类拓扑异构酶 I (TopoI) 毒物与 DNA 的相互作用。此外,使用针对此类化合物在甲醇存在下进行的分析测定