Organic Letters, Journal Year: 2025, Volume and Issue: unknown
Published: May 22, 2025
An enantioselective total synthesis of (-)-vallesamidine is described, integrating asymmetric hydrogenation with aza-Wacker cyclization to form the chiral spirocyclopentane-1,2'-indoline. Intramolecular Stetter reaction and alkylation are employed construct a tetracyclic framework featuring quaternary carbon center. Schmidt rearrangement intramolecular aldol condensation facilitate formation D E rings. This achieves in 14 steps an overall yield 4.2% from exocyclic enone ester.
Language: Английский