Limonoids from Aphanamixis polystachya and their antifeedant activity.

Eight new aphanamixoid-type aphanamixoids (C-J, 1-8) and six new prieurianin-type limonoids, aphanamixoids K-P (9-14), along with 10 known terpenoids were isolated from Aphanamixis polystachya, and their structures were established by spectroscopic data analysis. Among the new limonoids, 13 compounds exhibited antifeedant activity against the generalist Helicoverpa armigera, a plant-feeding insect, at various concentration levels. In particular, compounds 1, 4, and 5 showed potent activities with EC50 values of 0.

Daphnimacropodines A-D, alkaloids from Daphniphyllum macropodum.

Four new Daphniphyllum alkaloids, daphnimacropodines A-D (1-4), together with three known ones, daphnilactone B and daphnezomines H and I, were isolated from the fruits of Daphniphyllum macropodum. Their structures were determined by spectroscopic methods, especially 2D NMR techniques.

Isolation, X-ray crystallography, and computational studies of calydaphninone, a new alkaloid from Daphniphyllum calycillum.

[structure: see text]. A new hexacyclic alkaloid, calydaphninone (1), containing a 4-azatricyclo[5.2.