A Selective Method for the Synthesis of N,N′-Diarylbenzene-1,4-diamine and Dispirocyclic Quinazolinone Derivatives Catalyzed by Iodine.

Depending on the 2-aminobenzamides, N,N′-diarylbenzene-1,4-diamine or dispirocyclic quinazolinone derivatives are selectively obtained in I2-catalyzed reactions with cyclohexanedione (II).