Bioactivities of a New Pyrrolidine Alkaloid from the Root Barks of Orixa japonica.

A new pyrrolidine alkaloid named ()-3-(4-hydroxybenzylidene)-4-(4-hydroxyphenyl)-1-methylpyrrolidin-2-one was isolated from the ethanol extract of the root barks of The structure of the new alkaloid was elucidated on the basis of NMR and MS analysis. The compound exhibited larvicidal activity against the fourth instar larvae of (LC = 232.09 μg/mL), (LC = 49.91 μg/mL), and (LC = 161.10 μg/mL). The new alkaloid also possessed nematicidal activity against (LC = 391.50 μg/mL) and (LC = 134.51 μg/mL). The results indicate that the crude ethanol extract of root barks and its isolated pyrrolidine alkaloid have potential for development into natural larvicides and nematicides.