Navegando por Autor "Braz Filho, Raimundo"
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Item Biflavonoids and a glucopyranoside derivative from Ouratea semiserrata.(2002) Velandia, Javier Rincon; Carvalho, Mário Geraldo de; Braz Filho, Raimundo; Werle, Alceni AugustaTwo new biflavonoids, 5-hydroxy-7-methoxyflavone-(4 →O→8 )-4 ,5 ,7 -trihydroxyflavone and 5-hydroxy- 7-methoxyflavone-(4 →O→8 )-5 ,7 -dihydroxy-4 -methoxyflavone, and the glucopyranoside derivative, 1-O-(4-hydroxyphenyl)-6-O-(4-hydroxybenzoyl)- -D-glucopyranoside, as well as the known biflavones lanaraflavone, amentoflavone and podocarpusflavone, the triterpenes lupeol and friedelin, the lignans eudesmin and epieudesmin, the flavonol glycoside rutin, the steroids -sitosterol, stigmasterol, 3 - O- -D-glucopyranosylsitosterol, 7-oxostigmast-5-en-3 -ol and 7-oxostigmasta-5,22-dien-3 -ol, the carbohydrates - and -glucopyranose and 1-O-(4-hydroxybenzoyl)- -D-glucopyranoside, and the norsesquiterpene 6,9-dihydroxymegastigma-4,7-dien-3-one, have been isolated from leaves and branches of Ouratea semiserrata. The structures of these compounds were established from spectral data, including twodimensional NMR experiments and mass spectra.Item Complete assignment of the 1H and 13C NMR spectra of the tetraisoprenylated benzophenone 15-epiclusianone.(2001) Santos, Marcelo Henrique dos; Nagem, Tanus Jorge; Braz Filho, Raimundo; Lula, Ivana Silva; Speziali, Nivaldo LucioAn NMR study of 15-epiclusianone, 1-benzoyl-6-hydroxy-14,14-dimethyl-3,5,15-tri(3-methyl-2-butenyl)- bicyclo[3.3.1]non-1-ene-4,6-dione (1), a novel tetraisoprenylated benzophenone isolated from pericarp of fruits of Rheedia gardneriana, is described. In addition to conventional 1D NMR techniques, 2D shiftcorrelated NMR experiments [1H 1H-COSY, 1H 13C-HMQC-1J(C,H), 1H 13C-HMBC-nJ(C,H) (n = 2 and 3) and 1H 1H-NOESY] were used for 1H and 13C chemical shift assignments of this natural product. The 1D 13C NMR spectrum of 1 in the solid state was also obtained.Item Metabólitos especiais isolados de Laseguea erecta (Apocynaceae).(2006) Carvalho, Mário Geraldo de; Alves, Cássia Cristina Fernandes; Werle, Alceni Augusta; Braz Filho, RaimundoDo caule de Laseguea erecta foram isolados o lupeol, a cumarina escopoletina, o lignóide pinoresinol e o glicosil-cardenoídeo, -L-tevetosil-digitoxigenina. As estruturas foram identifi cadas com o uso de técnicas espectroscópicas de IV, RMN 1H e 13C, incluindo técnicas especiais 1D e 2D, espectroscopia de massas e comparação com dados da literatura.