Asymmetric Construction of Nitrogen-Containing [2.2.2] Bicyclic Scaffolds Using N-(p-Dodecylphenylsulfonyl)-2-pyrrolidinecarboxamide

An organocatalyzed approach to enantioenriched isoquinuclidines and bicyclo[2.2.2]octanes via a p-dodecylphenylsulfonamide-modified proline catalyst has been developed. A series of aromatic imines have been explored for the formation of isoquinuclidines with high levels of enantioselectivity and diastereoselectivity, strongly favoring the exo product. A series of aliphatic imines has also been explored, which provide access to bicyclo[2.2.2]octanes through a novel mechanistic pathway in high levels of enantioselectivity and diastereoselectivity, favoring the endo product.