Lewis acid assisted ring-closing metathesis of chiral diallylamines: an efficient approach to enantiopure pyrrolidine derivatives.

Lewis acid assisted ring-closing olefin metathesis (RCM) of chiral diallylamines, using the second generation RCM ruthenium-based catalyst, leads to enantiopure pyrrolidine derivatives in 79-93% yields under very mild conditions. The scope of the olefin metathesis has been expanded. [structure: see text]