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Structure Elucidation of Two New Diterpenoids from Isodon phyllostachys: Phyllostacins A and B
- Source :
- Helvetica Chimica Acta; June 2006, Vol. 89 Issue: 6 p1181-1186, 6p
- Publication Year :
- 2006
-
Abstract
- Two new ent-kaurane-derived diterpene derivatives, phyllostacins A (1) and B (2), were isolated from the aerial parts of Isodon phyllostachys, together with two known compounds, irroratin A (3) and serrin B (4). Both 1 and 2 were found to be present as diastereoisomers. In the case of 1, the corresponding diastereoisomeric diacetates 5 and 6 were prepared and separated. The structures of the new compounds were elucidated by extensive 1D- and 2D-NMR spectroscopic methods, in combination with MS experiments. In (D5)pyridine solution, the two epimers of 1 are present in equal amounts, but in CDCl3 or CD3OD, the (S)-epimer predominates in the mixture of hemiacetals.
Details
- Language :
- English
- ISSN :
- 0018019X and 15222675
- Volume :
- 89
- Issue :
- 6
- Database :
- Supplemental Index
- Journal :
- Helvetica Chimica Acta
- Publication Type :
- Periodical
- Accession number :
- ejs9314748
- Full Text :
- https://doi.org/10.1002/hlca.200690116