Breaking with convention: A homodinuclear nickel complex derived from a biphenyldiamine-based Schiff base catalyzed an anti-selective Mannich-type reaction of α-ketoanilides (see scheme) to afford unique building blocks for the synthesis of azetidine-2-amides and α-hydroxy γ-amino amides. This approach stands in contrast to conventional Mannich-type reactions for the synthesis of β-amino carbonyl compounds. o-Ns=o-nitrobenzenesulfonyl.
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