Facile chemoselective rhodium carbenoid N-H insertion reactions: synthesis of 3-arylamino- or 3-heteroarylpiperidin-2-ones

Rhodium(II) acetate catalyzed reactions of substituted 3-diazopiperidin-2-ones with various amines underwent chemoselective N-H insertion reactions to furnish 3-aminopiperidin-2-one derivatives.