作者:Scott M. Caplan、Paul E. Floreancig
DOI:10.1002/anie.201810336
日期:2018.11.26
This manuscript describes the first total syntheses of divergolides E and H. The route employs a telescoped hetero‐Diels–Alder and oxidative carbon–hydrogen bond cleavage as an entry into the central bridged bicyclic acetal unit. Additional key steps of the highly convergent route include a desymmetrizing epoxidation, a chelation‐controlled alkenylzinc addition, an amide formation between a hindered
这份手稿描述了苦参内酯E和H的第一个总合成物。该路线采用可伸缩的杂Diels-Alder和氧化性碳-氢键裂解作为进入中央桥联双环缩醛单元的入口。高度收敛的途径的其他关键步骤包括脱对称环氧化,螯合控制的链烯基锌的添加,受阻苯胺和酰化剂之间的酰胺形成(易于形成乙烯酮)以及具有挑战性的大内酯化作用。