Highly Enantioselective One‐Pot, Three‐Component Mannich‐type Reaction Catalyzed by an N,N′‐Dioxide–Scandium(III) Complex

Mild-mannered Mannich reaction: Highly enantioselective one-pot, three-component Mannich-type reaction of aldehydes, 2-aminophenol, and ketene silyl acetal with 5 mol % of a C(2)-symmetric N,N'-dioxide-based scandium(III) triflate (2:1) complex as the catalyst was achieved under mild conditions (see scheme), which facilitated the asymmetric synthesis of biologically interesting beta-amino esters.