2000
DOI: 10.1590/s0103-50532000000200007
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Chemical constituents from Ouratea floribunda: complete¹H and 13C NMR assignments of atranorin and its new acetyl derivative

Abstract: O fracionamento cromatográfico do extrato hexânico da madeira de Ouratea floribunda (Ochnaceae) forneceu, além dos triterpenos friedelina (1), friedelanol (2) e lupeol (3), o depsídeo atranorina (4). As estruturas das substâncias isoladas foram determinadas através da análise dos dados espectroscópicos de RMN 1 H e 13 C, massas e comparação com dados da literatura. A atribuição inequívoca dos deslocamentos químicos dos átomos de carbono e hidrogênio do depsídeo 4 e do seu novo derivado monoacetilado 4a foi rea… Show more

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Cited by 29 publications
(18 citation statements)
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“…Chromatographic separations led also to the isolation of 30-hydroxylup-20-(29)-en-3-one (5) [24] and 30-hydroxylup-20-(29)-en-3β-ol (6) [20,25], previously isolated from Catha cassinoides and Cassine papillosa, respectively, along with small amounts of atranorin [26], methyl 2,4-dihydroxy-3,6-dimethyl benzoate [27], sitosterol-3β-O-glucoside [28], and linoleic acid [29]. The structure elucidation of the known metabolites was based on comparison of their spectral data with literature values.…”
Section: Resultsmentioning
confidence: 99%
“…Chromatographic separations led also to the isolation of 30-hydroxylup-20-(29)-en-3-one (5) [24] and 30-hydroxylup-20-(29)-en-3β-ol (6) [20,25], previously isolated from Catha cassinoides and Cassine papillosa, respectively, along with small amounts of atranorin [26], methyl 2,4-dihydroxy-3,6-dimethyl benzoate [27], sitosterol-3β-O-glucoside [28], and linoleic acid [29]. The structure elucidation of the known metabolites was based on comparison of their spectral data with literature values.…”
Section: Resultsmentioning
confidence: 99%
“…Além dos flavonóides e biflavonóides, esses gêneros são bioprodutores de outras classes de metabólitos como triterpenos, diterpenos, depsídeos, ésteres graxos e triglicerídeos 17,[20][21][22][23] . Entre essas classes de substâncias, os biflavonóides recebem destaque na literatura, devido à freqüência e abundância com que são encontrados nesses gêneros e cuja diversidade estrutural é devida, principalmente, aos diferentes padrões de ligações entre seus monômeros.…”
Section: Flavonóides Identificados Nos Gêneros Ouratea E Luxemburgiaunclassified
“…Species of the Ochnaceae family are distributed in tropical and subtropical zones throughout the World (Hegnauer, 1969;Carvalho et al, 2000) This family is characterized by the presence of fl avonoids and bifl avonoids and terpenoids as main secondary metabolites (Oliveira et al, 2002;Estevam et al 2005). Several members of the Ouratea genus are employed for the extraction of edible oil, and are used as medicinal plants (Moreira et al, 1994;Agra et al, 2007).…”
Section: Introductionmentioning
confidence: 99%