Stereoselective Kinugasa/Aldol Cyclization: Synthesis of Enantioenriched Spirocyclic -Lactams
ORGANIC LETTERS(2023)
摘要
We report an enantioselective copper-catalyzed Kinugasa/aldol domino reaction. This strategy enables access to a range of spirocyclic beta-lactam pyrrolidinones in a stereoselective fashion. Under mild reaction conditions, prochiral alkyne-tethered ketones are coupled with nitrones to enable the facile construction of two spirofused ring systems containing three continuous stereocenters with excellent enantioselectivity. Also disclosed are post-transformation modifications demonstrating potential downstream functionalization of the spirocyclic molecules.
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