Configurational and conformational analysis of highly oxygenated pyrrolizidines: definitive identification of same naturally occurring 7a-epi-alexines
The NMR spectra of a number of naturally occurring alexines (tetrahydroxylated pyrrolizidine alkaloids) are analyzed and the consequences of changes in the configuration on the conformation of these bicyclic systems discussed. Unambiguous syntheses of australine (7-epi-alexine) and of 7,7a- epi-alex...
| Hauptverfasser: | , , , , , |
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| Format: | Journal article |
| Sprache: | English |
| Veröffentlicht: |
1998
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