Asymmetric Synthesis of 2-Substituted Hexahydroquinolin-4-ones Using a Pd-Catalyzed Asymmetric Allylic Amination and Intramolecular Mannich Reaction: Catalytic Asymmetric Synthesis of 2-epi-cis-195A
asymmetric allylicamination using a chiral diaminophosphine oxide (DIAPHOX) preligand and diastereoselective intramolecular Mannich reaction. The developed synthetic method could be applied to the catalytic asymmetric synthesis of (+)-2-epi-cis-195A. asymmetric allylicamination - asymmetric synthesis - chiral diaminophosphine oxide - decahydroquinoline alkaloid - intramolecular Mannich reaction - palladium
Gephyrotoxin 287C, a bioactive alkaloid bearing a perhydropyrrolo[1,2‐a]quinoline skeleton with five stereocenters, is an attractive target for synthetic organic chemistry. We achieved an enantioselectivetotalsynthesis of (+)‐gephyrotoxin 287C, for which the key steps were palladium‐catalyzed asymmetric allylic amination using a chiral diaminophosphine oxide (DIAPHOX) preligand, diastereoselective