An efficient and mild bismuth triflate-catalysed three-component Mannich-type reaction

In the presence of a catalytic amount of Bi(OTf)(3)center dot 4H(2)O, aldehydes together with amines react with silyl enolates to afford the corresponding Mannich-type adducts smoothly. A wide variety of silyl enolates derived from ketones, as well as esters and thioesters, react rapidly to afford the beta-amino ketones or the beta-amino esters in high yields (up to 94%).