Aza-Diels-Alder reaction of α,β-unsaturated sulfinylimines derived from α-amino acids with enolethers and enamines

α,β-Unsaturated sulfinylimines derived from α-amino acids undergo aza-Diels-Alder reaction with electron rich dienophiles such as enolethers and enamines. Subsequent elimination of sulfinyl and amine or alkoxy moiety on the resulting cycloadducts affords pyridines derived from α-amino acids.