A concise 8-step synthetic route toward ent-heliespirones A & C is described. This synthetic strategy features a highly diastereoselective palladium-catalyzed Michael addition to form 3,5-trans lactone and a final biomimetic intramolecular oxa-spirocyclization.
本文介绍了一条 8 步合成ent-heliespirones A 和 C 的简明路线。这一合成策略的特点是通过高度非对映选择性的
钯催化迈克尔加成反应生成 3,5-反式内酯,最后进行仿生分子内氧杂螺环化反应。