ChemInform Abstract: Contrasting Behavior of NBS Towards 1,4‐Dihydrobenzothieno[3,2‐b]pyridine 5,5‐Dioxides and 4,5‐Dihydro‐1H‐indeno[1,2‐b]pyridines.

Abstract

Benzothienopyridine dioxides (I) react with NBS under mild conditions to yield fully aromatized products (II) directly whereas the analogous indenones (III) give stable bromides (IV) which are not prone to dehydrobromination.