作者:Felix Kaden、Susanne Nowotni、Franziska Höfner、Melanie Lorenz、André Barthel、Anne Jäger、Felix Hennersdorf、Jan J. Weigand、Peter Metz
DOI:10.1002/ejoc.202100681
日期:2021.7.7
Domino metathesis of the acyclic substrates 2 and 3 prepared by asymmetric anti aldol reactions gave access to suitably functionalized carbobicyclic cores of (−)-dehydrocostus lactone (1). Subsequent transformation of these hydroazulenes to triol 4 by multiple hydroboration/oxidation installed three out of four stereogenic centers of the target sesquiterpenoid 1 in a single step and paved the way for
通过不对称反羟醛反应制备的无环底物2和3 的多米诺复分解获得了 (-)-脱氢木香内酯 ( 1 ) 的适当官能化碳双环核心。随后通过多次硼氢化/氧化将这些氢化甘菊烯转化为三醇4,在一个步骤中安装了目标倍半萜1的四个立体中心中的三个,并为内酯化铺平了道路。在将γ-内酯掩蔽为缩醛后,最终以良好的收率实现了后期双羰基烯化。