K 2 CO 3 : A Mild and Efficient Catalyst for the Synthesis of Pyran Annulated Heterocyclic Systems by Grinding Method Under Solvent-Free Conditions

Abstract

The potassium carbonate was applied as a green and efficient catalyst for the one-pot synthesis of pyran annulated heterocyclic systems, via the condensation between aromatic aldehydes, malononitrile and dimedone/1-naphtole by a grinding method at room temperature and solvent-free conditions. Short reaction times, environmentally friendly procedure and excellent yields are the main advantages of this procedure which makes it more economic than other environmentally synthetic methods.