vincamine/tabernaemontana

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Ibogan, Aspidosperman, Vincamine, and Bisindole Alkaloids from a Malayan Tabernaemontana corymbosa: Iboga Alkaloids with C-20α Substitution.

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Prijava / prijava

Ten new indole alkaloids (1-10) comprising five ibogan, two aspidosperman, one vincamine, and two bisindole alkaloids, in addition to 32 known alkaloids, were isolated from the stem-bark extract of a Malayan Tabernaemontana corymbosa. The structures of these alkaloids were determined based on

[12-Methoxy-17,18-dehydro-vincamine and 16-epi-isositsirikine, alkaloids from Tabernaemontana psorocarpa].

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Prijava / prijava

Besides sweroside ( 1) two main alkaloids were isolated from twigs and leaves of Tabernaemontana psorocarpa and shown to be 12-methoxy-17,18-dehydrovincamine ( 2) and 16-epi-isositsirikine ( 3) respectively.

Alkaloids from Tabernaemontana psorocarpa.

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Prijava / prijava

The isolation of the alkaloids from two different samples of stem bark of Tabernaemontana psorocarpa is described. Both samples contained 16-epi-isositsirikine as the major alkaloid but differed from each other in the number and quantity of the other alkaloids. The following minor alkaloids were

Seco-tabersonine alkaloids from Tabernaemontana corymbosa.

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Prijava / prijava

Two seco-tabersonine alkaloids, jerantiphyllines A and B, in addition to a tabersonine hydroxyindolenine, jerantinine H, and a recently reported vincamine alkaloid 7, were isolated from the leaf extract of the Malayan Tabernaemontana corymbosa and the structures were established using NMR and MS

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