Fig. 2
From: Enantiodivergence by minimal modification of an acyclic chiral secondary aminocatalyst
Origin of the reversal of enantioselectivity. a Enamine intermediate conformations. b Transition-state models for the asymmetric Mannich reaction of ketimine 1a and aldehyde 2a catalyzed by Ia/0.5TfOH and Id/0.5TfOH
