DITERPENOID ALKALOIDS FROM DELPHINIUM-DAVISII

Three new hetisane-type diterpenoid alkaloids, davisinol (6), 18-benzo yldavisinol (7), and Davisin (9) have been isolated from Delphinium da visii Munz. and their structures established by detailed spectroscopic studies. Accurate H-1- and C-13-NMR assignments have been made for ko busine (8), a related hetisane-type alkaloid, and karakoline (5), a no rditerpenoid alkaloid. The known norditerpenoid alkaloids 14-acetylper egrine (4), 6-deacetylperegrine (3), and karakoline (5) and the diterp enoid alkaloids hetisine and hetisinone were also isolated.