RESUMEN
Three olean (beta-amyrenone, beta-amyrin and maniladiol), three ursane (alpha-amyrinone, alpha-amyrin and breine) and four tirucallane (3-oxotirucalla-8,24-dien-21-6ic acid, 3alpha-hydroxytirucalla-8,24-dien-21-oic acid, 3alpha-acetoxytirucalla-8,24-dien-21-oic acid and 3alpha-hydroxytirucalla-7,24-dien-21-oic acid) triterpenes were isolated from the oleoresin of Protium hebetatum Daly. The structures were established mainly by 13C, 1D and 2D NMR spectroscopic analysis. The isolation of 3alpha-hydroxytirucalla-8,24-dien-21-oic acid permitted correction of the chemical shift assignments of some of its carbon atoms.
Asunto(s)
Burseraceae/química , Extractos Vegetales/aislamiento & purificación , Espectroscopía de Resonancia Magnética , Extractos Vegetales/química , TriterpenosRESUMEN
From Humirianthera ampla, Icacinaceae, were isolated a phthalate, lupeol, â-sitosterol, glycosyl- sitosterol, one known annonalide diterpene and two new diterpenes named Humirianthol and Acrenol. Humirianthol and Acrenol were determined by 1D and 2D NMR spectroscopic techniques to be 3 â, 20:14 â, 16-diepoxy-3 á, 15 á-dihydroxy-7-pimaren-19, 6 â-olide and 3 â, 20-epoxi-3 á, 15, 16-trihydroxy-7-pimaren-19, 6 â-olide, respectively. Acrenol has antimicrobial activity.