21, 20-Anhydromelianone and Melianone from Simarouba amara (Simaroubaceae); Carbon-13 NMR Spectral Analysis of 7-Tirucallol-Type Triterpenes
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چکیده
Further examination of the hexane extract of the root bark of Simarouba amara (Simaroubaceae) has led to the isolation of two side chain oxygenated A’tirucallol-type triterpenes in addition to the already reported compounds 4 and S. One has been found to be identical with the known melianone 8 and the second is a new compound and has been shown to be 21,20-anhydromelianone 11. The 13C-NMR spectra of nine A’-tirucallol derivatives have been analysed and the data obtained have been applied to the confirmation of the structure of the new substance 11.
منابع مشابه
Genetic evidence of Quaternary demographic changes in four rain forest tree species sampled across the Isthmus of Panama
Methods Nuclear microsatellite variation was assayed in multiple populations (1179 trees, 21 locations, 6–13 locations per species) in Jacaranda copaia (Bignoniaceae), Luehea seemannii (Malvaceae), Simarouba amara (Simaroubaceae) and Symphonia globulifera (Clusiaceae). Population structure was analysed using FST-based statistics and a Bayesian clustering approach (baps). Bayesian coalescent met...
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