Coumarins with Pyrazolopyrimidine pendants at the third position were synthesized and evaluated for their activity as semiochemicals against insect Spodoptera litura L. (Lepidoptera : Noctuidae) to evaluate their repellant and antifeedant activity. The test solutions were prepared by dissolving 2 mg of the newly synthesized compound in 1 ml of chloroform. Among six compounds (1-6), compound 3 had shown highest antifeedent activity and compound 5 was with least antifeedent activity when compared to controlled leaf exposed fifth instar test insect larvae. This suggests that compound 3 could be developed in future as antifeedant and repellent against various insect pests in addition to Spodoptera litura based on further studies with other insects.