Synthesis of 6H‐Thieno[3,2‐b]pyridin‐7‐ones from N‐(2‐X‐Carbonyl)‐3‐thienyl Ketenimines (X = RS, ArO, R2N) via Consecutive [1,5‐]‐X Sigmatropic Rearrangement and 6π‐Electrocyclization. | Publicación