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In Marcgravia williamsii (Marcgraviaceae) pianta usata in Perù nella medicina popolare con il nome di Murcu Huasca sono stati isolati l'armina, la tetraidroarmina e in minore quantità l'armalina, l'armolo e l'armano. È la prima volta che questo gruppo di alcaloidi viene riscontrato in Marcgraviaceae.
Sono stati esaminati gli spettri di RMN, in CCl ed in CH, di vari acidi diterpenici -metil---insaturi. La determinazione dello spostamento chimico subito dal metile adiacente al carbonio insaturo ha permesso di stabilire l'isomeria geometrica del doppio legame in 13-14.
The alkaloid composition of Tabernaemontana sananho, a plant used in Perù in folk medicine, has shown the presence of coronaridin, ibogamin, 19-hydroxycoronaridin, 20-hydroxycoronaridin (heyneanine) and voacangine. The finding of 19-hydroxycoronaridin, which, during extraction rapidly undergoes to chemical changes, indicates that this alkaloid may be found in other species of Tabernaemontana when appropriate techniques are used.
Two new alkaloids from a sample of Ervatamia coronaria (syn Tabernae-montana coronaria) an Apocynacea, grown in the state of Pernambuco (Brasil). The structures of these alkaloids were established through the physico-chemical properties (u.v., i.r., n.m.r. spectra), the mass fragmentation patterns and the chemical behaviour. The alkaloids, derived both from coronaridin (18-carbomethoxy ibogamin)(I), also present in the plant, are 19,(2)-ketopropyl-coronaridin(V) and 19-oxo-coronaridin(VI). Ten other...
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