intramolecular Michael addition as a pivotal step, furan 4 has been converted to dioxaspiro compounds 5 and 6, whose heterocyclic frameworks constitute important structural units of 14,15-dihydroprehispanolone 3 and prehispanolone 1, respectively. Hispanolone 2 was converted to 3 as well as 1 by utilizing a similar strategy.
利用分子内迈克尔加成作为关键步骤,
呋喃4已转化为dioxaspiro化合物5和6,它们的杂环骨架分别构成14,15-dihydroprehispanolone 3和prehispanolone 1的重要结构单元。通过使用类似的策略,将Hispanolone 2转换为3以及1。