Synthesis of Quinoxalines by a Carbon Nanotube-Gold Nanohybrid-Catalyzed Cascade Reaction of Vicinal Diols and Keto Alcohols with Diamines

A one‐pot oxidation–condensation method for the synthesis of quinoxalines from readily available benzoins or benzhydrols and 1,2‐phenylenediamines or 2,3‐diaminopyridine by use of a gold–carbon nanotube nanohybrid as a heterogeneous catalyst is reported. Quinoxalines are formed under mild conditions in air and in excellent yields. The simple and efficient methodology offers a safe and sustainable alternative to conventional acid and/or base‐catalyzed thermal processes. Mild and free: A one‐pot oxidation–condensation method for the synthesis of quinoxalines from readily available benzoins or benzhydrols and aromatic 1,2‐diamines is achieved by use of a gold–carbon nanotube nanohybrid. Quinoxalines are formed under mild conditions in air and in excellent yields.