Synthesis of iso-epoxy-amphidinolide N and des-epoxy-caribenolide I structures. Revised strategy and final stages
作者:K. C. Nicolaou、Paul G. Bulger、William E. Brenzovich
DOI:10.1039/b602021f
日期:——
agents amphidinolide N (1) and caribenolide I (2) has been developed, and the total synthesis of iso-epoxy-amphidinolide N and des-epoxy-caribenolide I structures is described. Central to the revised strategy was the use of a Horner-Wadsworth-Emmons olefination between beta-ketophosphonate 51 and aldehyde 14 to construct the C1-C13 sector common to both 1 and 2. Stereoselective alkylation of hydrazone 11
已开发出一种通用且高度收敛的合成途径,可制得抗肿瘤药两性霉素N(1)和碳糖单抗I(2)的大环核心结构,并且异环氧-两性内酰胺N和脱环氧-碳环内酰胺I结构的全合成描述。修订后的策略的核心是使用β-酮膦酸酯51和醛14之间的Horner-Wadsworth-Emmons烯化反应来构建1和2共有的C1-C13区段。11 11的立体选择性烷基化先用碘化物65再用溴化物进行。 56允许快速组装完整的Caribenolide I碳骨架。完成脱环氧-碳北烯内酯I结构78合成的关键步骤包括使用Me(3)SnOH水解敏感的甲酯,然后对所得二醇癸二酸进行区域选择性大环内酯化和整体脱保护。11,溴化物56和碘化物64偶联后,进行类似的后期操作序列,以得到完全脱保护的去氧-环氧-两性内酰胺N骨架,该骨架为半缩醛和双环缩醛84的混合物。双环乙缩醛84中C 6亚甲基的选择性环氧化提供了对异-环氧-两性内酯N立体异构体89的接近。