Tetrachlorosilane and zinc chloride as a binary reagent for the preparation of 2-amino-6-chloropyridine-3,5-dicarbonitrile derivatives

A green one-pot method for efficient synthesis of 2-amino-6-chloropyridine-3,5-dicarbonitrile derivatives was developed, based on stirring of various aldehydes and malononitrile with tetrachlorosilane and zinc chloride under solvent-free conditions at room temperature for 3–10 h. The effects of zinc chloride and the reaction conditions were studied. Compounds were characterized by X-ray analysis and NMR spectroscopy.