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Terengganensines A and B, dihydroeburnane alkaloids from Kopsia terengganensis
✍ Scribed by Shasya Uzir; Ali M. Mustapha; A.Hamid A. Hadi; Khalijah Awang; Christophe Wiart; Jean-François Gallard; Mary Païs
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- French
- Weight
- 186 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
Five known indole alkaloids, (+)-quebrachamine, (-)-eburnamine, (+)-isoeburnamine, (-)eburnaminol and (+)-larutensine, and two new alkaloids, terengganensines A 1 and B 2, possessing a unique dihydroeburnane skeleton were isolated from the bark of Kopsia terengganensis. The structures of the new compounds were elucidated by spectral methods.
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Three novel quinolinic alkaloids, viz., mersinines A and B and mersiloscine, were obtained from a Malayan Kopsia species and the structures established by spectroscopic analysis.
## Bark and leaves MKopsia lapidilecta Van der Slmen were extrackd Two MY in&le alkaloids were aforded : lapidilec~inc A I (bark) and lapidilcctine B 2 (leaves). Both possess a novel skeleton with ajive membered wuaturated rbtg. The swuctures of these alMoids wre elucidated especially by 20 NMR an
Two novel indole alkaloids having unusual skeletons were isolated from the aerial part of Yunnan Kopsia arborea. Kopsiyunnanine A (1) is a new class of bisindole alkaloid composed of vallesiachotamine (modified Corynanthe-type) and Aspidospermatan-type alkaloids. Kopsiyunnanine B ( 2) is a new Coryn