Terpenoids. XX. The Structure and Absolute Configuration of Lasiokaurin and Lasiodonin, New Diterpenoids from Isodon lasiocarpus (HAYATA) KUDO

Abstract

On the basis of chemical and spectroscopic evidence, the structure and absolute configuration of lasiokaurin and lasiodonin, which were isolated from Isodon lasiocarpus (HAYATA) KUDO, were established as ent-7β, 20-epoxy-1β-acetoxy-15-oxo-16-kaurene-6α, 7α, 14α-triol (II) and ent-7β, 20-epoxy-15-oxo-16-kaurene-1β, 6α, 7α, 11α-tetraol (VIII), respectively.