Zr(OTf)4-Catalyzed Direct Three-Component Mannich-Type Reaction of Carbamates: An Efficient One-Step Synthesis of N-Protected β- Aryl-β -Amino Ketones

Carbamates were reacted in one pot with aromatic aldehyde and ketones at ambient temperature in the presence of catalytic amount of Zr(OTf)4 to furnish the corresponding N-protected β-amino-β-aryl ketones in good yields.