NaI Readily Mediated Oxidative Aromatization of Hantzsch 1,4-Dihydropyridines with Hydrogen Peroxide at Room Temperature: A Green Procedure

The oxidative conversion of 1,4-dihydropyridines to give the corresponding pyridine derivatives in excellent yields was easily effected using the catalytic amount of NaI in combination with H2O2 (30%) as a green external oxidant. The process is highly green wherein the solid products are easily filtered out after the addition of ice-water to the reaction mixture. This non-transition metal catalyst is cost-effective, affords simple work-up and easy separation of the product.