Scheme 3. Scope of 2-amino-3-cyanopyridine derivatives.^{a a}Reaction conditions: arylaldehyde (1.0 mmol), acetophenones (1.0 mmol), ammonium acetate (1.5 mmol), malononitrile (1.0 mmol), GO/IL/Zn_xCl_y (5 mg), solvent-free, 110 °C, 40 min. Isolated yield by crystallization in ethanol (15–20 mL).