An Enantioselective Entry to Substituted 6-Membered Nitrogen Heterocycles from Chiral Pyridinium Salts via Selective Epoxidation of Tetrahydropyridine Intermediates - Gil, Laurent; Compère, Delphine; Guilloteau-Bertin, Bérangère; Chiaroni, Angèle; Marazano, Christian (Synthesis, 2000)