73(P2-3) シダ植物およびキク科植物から得られた新骨格のトリテルペノイド(ポスター発表の部)  [in Japanese] 73(P2-3) TRITERPENOIDS HAVING NOVEL CARBON SKELETONS ISOLATED FROM FERN AND COMPOSITE PLANTS  [in Japanese]

From fresh rhizomes of the fern, Polypodiodes niponica (NAKAI) CHING (=Polypodium niponicum NAKAI, Polypodiaceae), the new migrated dammarane hydrocarbon, aonena-3,21-diene (1) was isolated and its structure was established by spectral and chemical methods. Compound 1 is the first example of a final migrated product belonging to the dammarane triterpenoid with a S configuration at C-18 in the side chain. In addition, two oily migrated malabaricane hydrocarbons, podioda-7,17,21-triene (2) and podioda-8,17,21-triene (3) were isolated from the same fern materials. These are also the first example of a migrated malabaricane triterpenoid. From the fresh roots of the composite plant, Picris hieracioides LINNE subsp. japonica (THUNB.) KRYLOV. (Compositae), gammacer-16-en-3β-yl acetate (4), having a new basic triterpenoid skeleton, was isolated along with its corresponding 3α- and 3β-ols (5,6) and their structures were established by physico-chemical and single X-ray crystallographic methods. Two new compounds, pichierenyl acetate (7) and isopichierenyl acetate (8), were also isolated and their structures were confirmed by an acid induced rearrangement experiment of the compound 4.