化学
立体中心
全合成
邻接
序列(生物学)
立体化学
天然产物
二烯
有机化学
催化作用
对映选择合成
生物化学
天然橡胶
作者
Nicholas J. Hafeman,Melinda Chan,Tyler J. Fulton,Eric J. Alexy,Steven A. Loskot,Scott C. Virgil,Brian M. Stoltz
摘要
The first total synthesis of the furanobutenolide-derived cembranoid diterpenoid havellockate is disclosed. Our convergent strategy employs a Julia–Kocienski olefination to join two enantioenriched fragments to produce a diene that is subsequently used in a propiolic acid esterification/Diels–Alder cascade. This sequence generates the fused carbocyclic core of the natural product in short order. A challenging Zn-mediated Barbier allylation then forges the final C–C bond and also establishes two vicinal stereogenic centers. Finally, a Cu-catalyzed aerobic oxidation facilitates the formation of the β-hydroxybutanolide to complete the total synthesis.
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