Total Synthesis and Selective Activity of a New Class of Conformationally Restrained Epothilones
作者:Mamoun M. Alhamadsheh、Shuchi Gupta、Richard A. Hudson、Lalith Perera、L. M. Viranga Tillekeratne
DOI:10.1002/chem.200701143
日期:2008.1.7
Stereoselective total syntheses of two novel conformationally restrained epothilone analogues are described. Evans asymmetric alkylation, Brown allylation, and a diastereoselective aldol reaction served as the key steps in the stereoselective synthesis of one of the two key fragments of the convergent synthetic approach. Enzyme resolution was employed to obtain the second fragment as a single enantiomer
描述了两种新型构象限制埃坡霉素类似物的立体选择性全合成。埃文斯不对称烷基化、布朗烯丙基化和非对映选择性羟醛反应是聚合合成方法的两个关键片段之一的立体选择性合成的关键步骤。采用酶拆分以获得作为单一对映体的第二片段。分子通过酯化组装,然后进行闭环复分解。在初步的细胞毒性研究中,其中一种类似物对两种白血病细胞系表现出比人类实体肿瘤细胞系更强的选择性生长抑制活性。该类似物的精确生物学作用机制和高度选择性仍有待研究。