Asymmetric Construction of Enantioenriched Spiro gem-Diamines via [3+3] Annulation of α,β-Unsaturated N-Sulfonyl Ketimines and 3-Aminobenzofurans

A general and facile catalytic asymmetric protocol for the construction of enantioenriched spiro gem-diamines through [3+3] annulation of α,β-unsaturated N-sulfonyl ketimines and 3-aminobenzofurans has been accomplished under the catalysis of...