Synthesis, characterization and antioxidant activities of highly functionalized cyclopentadienes catalyzed by ZnO-nanorod as economic and efficient heterogeneous nano catalyst

A three-component condensation was applied for the preparation of cyclopentadiene derivatives through the reaction of primary amines, alkyl propiolate, dialkyl acetylenedicarboxylate in the presence of catalytic amount of ZnO-nanorod (Zn-NR) under solvent-free conditions at 50 °C. Moreover, the antioxidant activity and free radical scavenging capacity of the newly synthesized derivatives was screened.