Abstract

Diazoacetoacetamides undergo rhodium(II) catalyzed decomposition to form β-lactam products in high yield and with exceptional stereocontrol. Diazoacetamides generally yield mixtures of β- and γ-lactam products whose preference for β-lactam formation can be enhanced by rhodium(II) 2-phenoxybenzoate. Dirhodium(II) catalysts with chiral carboxamide ligands afford a new enantioselective route to lactams.

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