AbstractHeterocyclic compounds, including benzimidazolones, naphthimidazolone, benzoxazolones, benzothiazolone, quinazolinone, benzoxazinone, quinazolinedione, and imidazopyridinone were synthesized in good yields by sulfur‐assisted carbonylation of aromatic amines with carbon monoxide (1 atm) at room temperature, with subsequent oxidation using molecular oxygen (1 atm, RT). The present method is characterized as a simple procedure carried out under quite mild condition