A synthesis of the pyranonaphthoquinone antibiotic (±)-frenolicin B[(±)-1] is described. Key step is the intramolecular palladium-catalyzed aryloxycarbonylation of the 2-allyl-1-naphthol derivatives 8a,b to give the tricyclic λ-lactones 6a,b. Only the former (6a) is converted successfully into (±)-deoxyfrenolicin, the immediate precursor of (±)-1.
本文描述了
吡喃
萘醌类抗生素 (±)-frenolicin B[(±)-1] 的合成过程。关键步骤是分子内
钯催化 2-烯丙基-1-
萘酚衍
生物 8a、b 的芳氧基羰基化,得到
三环δ"-内酯 6a、b。只有前者(6a)能成功转化为(±)-脱氧
肾上腺素,即(±)-1的直接前体。