Simple Synthetic Method for the Functionalized Benzo[c]cinnolines

Functionalized benzo[c]cinnoline derivatives were synthesized from easily accessible 2,2‐diamino‐1,1′‐biaryls using a nitrite source. In this simple process, various functional groups were tolerated under mild reaction conditions, and the practicality of the process was demonstrated through the gram‐scale production of the benzo[c]cinnolines. Functionalized benzo[c]cinnoline derivatives were synthesized from easily accessible 2,2′‐diamino‐1,1′‐biaryls using a nitrite source. This simple method shows high tolerance of various functional groups and the practicality of the process through gram‐scale production of the benzo[c]cinnolines.