Total Synthesis of 7-Ethyl-10-hydroxycamptothecin (SN38) and its Application to the Development of C18-Functionalized Camptothecin Derivatives
作者:Yuan-Shan Yao、Jia-Li Liu、Jie Xi、Bukeyan Miu、Guai-Sai Liu、Shaozhong Wang、Linghua Meng、Zhu-Jun Yao
DOI:10.1002/chem.201101389
日期:2011.9.5
N‐acyliminium intermediate with a silyl enol ether. An intramolecular oxa Diels–Alder reaction efficiently constructed the D and E rings in one step. Successive asymmetric dihydroxylation and I2‐based hemiacetal oxidation furnished the stereochemistry of SN38 with high enantiopurity. Utilizing the ABC‐ring intermediate and a functionalized silyl enol ether permitted the synthesis of a number of new C18‐functionalized
喜树碱前药伊立替康的活性代谢产物SN38的新化学合成已通过简单的市售起始原料实现了12个步骤。温和有效的FeCl 3催化的Friedländer缩合成功地用于构建AB环系统。C环的官能化通过的原位产生的N一插烯向山反应完成- acyliminium中间体与甲硅烷基烯醇醚。分子内氧杂Diels-Alder反应可一步有效地构建D和E环。连续不对称二羟基化和I 2基于半缩醛的氧化使SN38的立体化学具有很高的对映体纯度。利用ABC环中间体和官能化的甲硅烷基烯醇醚可以合成许多新的C18官能化的SN38衍生物。发现带有C 10甲氧基的几种新颖的SN38衍生物相对于SN38表现出可比的或更有效的抑制癌细胞增殖的活性。