Piscidinols H–L, apotirucallane triterpenes from the leaves of Walsura trifoliata and their insecticidal activity

Abstract Five new apotirucallane-type terpenoids, Piscidinols H–L ( 1 – 5 ), were isolated from the leaves of Walsura trifoliata and their structures were fully established on the basis of detailed spectroscopic (especially 2D NMR and mass) analysis. These new compounds possessed tetracyclic and acetal rings. All the new isolates were evaluated for their antifeedant activities in tobacco caterpillar ( Spodoptera litura ) and castor semilooper ( Achaea janata ) using a no-choice laboratory bioassay and the test compounds ( 1 – 6 ) exhibited moderate insecticidal activities.