Cobalt/Copper-Cocatalyzed Synthesis of Imidazo[1,2‑a:3,4‑a′]dipyridiniums from 2H‑[1,2′-Bipyridin]-2-ones and 2‑Bromoacetophenones

A cobalt/copper-cocatalyzed facile synthesis of imidazo­[1,2-a:3,4-a′]­dipyridiniums from 2H-[1,2′-bipyridin]-2-ones and 2-bromoacetophenones is presented. This strategy provides an alternative to the imidazo­[1,2-a:3,4-a′]­dipyridinium synthesis by employing readily available substrates and a simple procedure, which would render this method potentially useful in organic synthesis.