Abstract
The roots and stems of Aristolochia triangularis CHAMISSO, a woody climber growing in Brasil, contain fatty acids as well as (-)-kaur-16-en-18-acid,
but no aristolochic acids. The following stigmastane type triterpenes have been isolated:
stigmast-4-en-3-on, stigmastan-3,6-dion and stigmast -4-en-3,6-dion as well as kaurane
diterpenes: (-)-kaur-16-en, (-), kaur-16-en-18-al, (-)-kauran-16α-ol-18-al, (-)-16α,
17-epoxykauran, (-)-kaur- 16 - en-18-ol and (-)-kaur-15-en-17-ol. In addition sesquiterpenes
have been found: (-)-α-ylangen, (-)-α-copaen, (E)-β-elemen, γ-elemen, (E)-(R)-Nerolidol.
The lignanes isolated from A. triangularis include cubebin, found so far only in Piper cubeba, and galbacin. The new lignans 3,4-dimethoxy-3,4-desmethylendioxycubebin and 3′,4′-dimethoxy-3′,4′-desmethylendioxycubebin
have been identified. For better interpretation of the 1H-NMR-spectra in relation to the stereochemistry, the 6,6′-dinitro derivates are suitable.
Key Word Index
Aristolochia triangularis - Aristolochiaceae - Lignanes - Kaurans - Sesquiterpenoids
- Triterpenoids
