10.1021/jo902172r
The research focuses on the synthesis of (+-)-2-epi-pumiliotoxin C using oxazolone cycloadducts as heterocyclic scaffolds. The study employs an intramolecular Diels-Alder cycloaddition of N-substituted oxazolone triene to directly access the functionalized octahydroquinoline framework. Key chemicals involved in the research include divinyl carbinol, heptadienal, oxazolidine-2,4-dione, and diethylzinc. The synthesis process involves several steps, such as Saucy-type rearrangement, Grignard reaction, Mitsunobu reaction, cyclopropanation, and hydrogenolysis, ultimately leading to the final product (+-)-2-epi-pumiliotoxin C. The research demonstrates the utility of oxazolone IMDA cycloadducts as valuable scaffolds for alkaloid construction and provides a direct incorporation approach to synthesizing complex natural products.