Novel (−)‐β‐Pinene‐Derived Triazolium Salts: Synthesis and Application in the Asymmetric Stetter Reaction

A series of novel chiral triazolium salts derived from (−)-β-pinene were synthesized and found to be highly efficient precatalysts for the enantioselective intramolecular Stetter reaction. The triazolium salts prepared from a single precursor, (−)-β-pinene, react with antipodal enantiofacial selectivity in the Stetter reaction to afford mono-, di-, and trisubstituted chromanones in excellent yields with excellent stereoselectivity.