The Catalytically Lignan-Activation-Based Approach for the Synthesis of (<i>epi</i>)-Podophyllotoxin Derivatives
作者:Jun-Hao Wan、Yang Hu、Hui Liu、Yuan-Hong Tu、Zhong-Yi He、Jian-Song Sun
DOI:10.1021/acs.joc.7b00485
日期:2017.6.2
acid, could efficiently couple with a variety of nucleophiles including alcohol, phenol, aniline, and carbon nucleophiles, all to provide (epi)-podophyllotoxin derivatives. Thus, the first catalytic and lignan-activation-based approach for (epi)-podophyllotoxin derivatization was established. Based on the new methodology, as well as the judicious choice of N3, AZMB, and Cbz protecting groups, an efficient
在催化量的Au(I)配合物的作用下,通过(epi)-鬼臼毒素和邻-环丙基乙炔基苯甲酸之间的脱水缩合可以很容易地制备4- O-(2-环丙基乙炔基)苯甲酰基-(epi)-鬼臼毒素与各种亲核试剂(包括醇,苯酚,苯胺和碳亲核试剂)结合,均可提供(Epi)-鬼臼毒素衍生物。因此,建立了第一个基于催化和木脂素活化的(Epi)鬼臼毒素衍生化方法。基于新方法,以及对N 3的明智选择,AZMB和Cbz保护基,提出了一种有效的方法。建立了II期临床试验中的抗肿瘤药NK-611,其特征在于在关键的缩合步骤中半缩醛OH的原位异构化。从容易获得的起始原料开始,使用最长的线性步骤(六步)和38%的总收率获得目标分子。