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Journal of Natural Products 2008-Jan

Biologically active aspidofractinine alkaloids from Kopsia singapurensis.

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G Subramaniam
Osamu Hiraku
Masahiko Hayashi
Takashi Koyano
Kanki Komiyama
Toh-Seok Kam

Ključne riječi

Sažetak

Ten new indole alkaloids of the aspidofractinine type, in addition to several recently reported indole alkaloids and 20 other known alkaloids, were obtained from the leaf and stem-bark extract of the Malayan Kopsia singapurensis, viz., kopsimalines A-E (1-5), kopsinicine (6), kopsofinone (7), and kopsiloscines H-J (8-10). The structures of these alkaloids were determined using NMR and MS analysis. Kopsimalines A (1), B (2), C (3), D (4), and E (5) and kopsiloscine J (10) were found to reverse multidrug-resistance in vincristine-resistant KB cells, with 1 showing the highest potency.

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