Total synthesis and stereochemical reassignment of (+)-dolastatin 19, a cytotoxic marine macrolide isolated from Dolabella auricularia
作者:Ian Paterson、Alison D. Findlay、Gordon J. Florence
DOI:10.1016/j.tet.2007.01.048
日期:2007.6
the cytotoxic marine macrolide dolastatin 19 is proposed, together with its validation by completion of the first total synthesis. Key features of the highly stereocontrolled route include an asymmetric vinylogous Mukaiyama aldol reaction to simultaneously install both the remote C13 stereocenter and the C10–C11 (E)-trisubstituted olefin, two sequential 1,4-syn boron-mediated aldol reactions, and a late-stage
利用构象分析和生物遗传学的考虑,提出了针对细胞毒性海洋大环内酯多拉汀19的修订构型分配,并通过完成第一个总合成对其进行了验证。高度立体控制的路线的主要特征包括不对称的乙烯基Mukaiyama羟醛反应,可同时安装远程C13立体中心和C10-C11(E)-三取代的烯烃,两个顺序的1,4-顺硼硼介导的羟醛反应,以及一个后期反应。阶段的α选择性Mukaiyama糖基化反应,以附加l-鼠李糖衍生的吡喃糖苷。