Enantioselective Syntheses of Tetrahydroquinolines Based on Iridium‐Catalyzed Allylic Substitutions: Total Syntheses of (+)‐Angustureine and (–)‐Cuspareine

Abstract

Abstract A protecting‐group‐free two‐step approach for the preparation of tetrahydroquinolines has been developed. The procedure involves a highly regio‐ and enantioselective intermolecular iridium‐catalyzed allylic amination followed by one‐pot hydroboration and intramolecular Suzuki–Miyaura cross‐coupling. This method was applied in total syntheses of the alkaloids (+)‐angustureine and (–)‐cuspareine.