The oxa-Michael-aldol condensation reaction offers a fast access to xanthenone scaffolds, which are an important structural motif in natural products. This reaction was investigated and a new organocatalyst based on phosphine was discovered (PhPMe2). After optimization of the reaction conditions, the Michael donors and acceptors were screened to determine the scope and limitations of this reaction. Furthermore, important observations were made, allowing the formulation of a surprising reaction pathway for this catalyst system.
oxa-Michael-aldol缩合反应提供了一种快速获得
氧杂蒽酮骨架的方法,这是
天然产物中的一个重要的结构基序。本研究对这一反应进行了探讨,并发现了一种基于膦的新型有机催化剂(PhPMe2)。在优化反应条件之后,对Michael给体和受体进行了筛选,以确定该反应的范围及局限性。此外,还取得了一些重要的发现,使得该催化体系的新颖反应途径得以确立。