Melodinus celastroides

The aerial parts of Melodinus celastroides (Apocynaceae), as well as yielding several monoterpene indole alkaloids, including tabersonine (110),... 

The structure of 16BH-A -vincanol, a constituent of Melodinus celastroides, has been confirmed by X-ray crystal structure... 

Rabaron and Plat (295) have reported the isolation and structure elucidation of four new alkaloids from the leaves and twigs of Melodinus celastroides Baillon. 

The branches and leaves of Melodinus celastroides have yielded 19-epi-vindolinine, (19/ )- and (19S)-hydroxytabersomne, (-)-tabersonine, (-)-venalstonine, (-)-vindolinine, and five new alkaloids, which are 14,15-dehydroisoeburnamine, buxomeline (189), and three alkaloids whose structures have not yet been disclosed, viz. melonine, melonine TVb-oxide, and methylene-bis-l,r-melonine. The structure (189) of buxomeline was deduced almost entirely from its spectroscopic properties the presence of both Nb-carbinolamine and carbinolamine ether functions is unusual. 

Methylene-bis-l,l -melonine is a new constituent of Melodinus celastroides whose structure has not yet been revealed. ... 

Sarpagine-Ajmaline-Picraline-Vobasine Group. The roots and stems of Rauwolfia schueli Speg. (R. boliviana Mgf.) have been re-examined,and the ajmaline content has been quantitatively estimated the conclusion is that this plant constitutes one of the richest sources of ajmaline. Ajmaline also occurs in Melodinus balansae Baillon var. paucivenosus, normacusine B occurs in Strych-nos nux vomicai akuammidine in M. celastroides, and pericyclivine and caberine in the aerial parts of Catharanthus ovalis. ... 

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