A Highly Enantio‐ and Diastereoselective Cu‐Catalyzed 1,3‐Dipolar Cycloaddition of Azomethine Ylides with Nitroalkenes

Abstract

Electronic properties of the ligands switch the diastereoselectivity in the Cu-catalyzed 1,3-dipolar cycloaddition of azomethine ylides to nitroalkenes: exo- or endo-pyrrolidines were obtained with high diastereo- and enantioselectivities in the presence of different chiral (phosphanylferrocenyl)oxazoline ligands (e.g. 3 a, b).