Convergent Route to ent-Kaurane Diterpenoids: Total Synthesis of Lungshengenin D and 1α,6α-Diacetoxy-ent-kaura-9(11),16-dien-12,15-dione
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The Hoppe’s homoaldol reaction of a cyclo-hexenyl carbamate with an aldehyde followed by an unprecedented BF3·OEt2 mediated intramolecular Mukaiyama–Michael-type reaction affords the tetracyclic core structure of ent-kaurane diterpenoids. The usage of this convergent approach for assembling these natural products is demonstrated by the first asymmetric total syntheses of two highly oxidized ent-kaurane diterpenoids: Lungshengenin D and 1α,6α-diacetoxy-ent-kaura-9(11),16-dien-12,15-dione.
创建时间：
2017-02-14
