Author(s): Guedes, Maria L. S. ; Cruz, Frederico Guare ; Silva Neto, José T. da ; Guedes, Maria L. S. ; Cruz, Frederico Guare ; Silva Neto, José T. da
Date: 2014
Origin: Oasisbr
Subject(s): Kielmeyera lathrophyton; Guttiferae; Xanthones; 4-alkylcoumarins; 4-phenylcoumarins; Neoflavonoids
p. 117-122
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Do extrato hexânico de Kielmeyera lathrophyton foram isoladas duas novas xantonas, 1,5 -diidroxi -6' -metil -6' -(4 -metil -3 -pentenil) -pirano(2',3':3,2) -xantona, 1,7 -diidroxi -6' -metil -6' -(4 -metil -3-pentenil) -pirano(2',3':3,2) -xantona. Uma terceira xantona, a 2,3 -metilenodioxixantona, teve a atribuição dos dados de RMN de 13C revista. Foram isoladas ainda seis cumarinas sendo duas delas inéditas, 7 -hidroxi -8 -(3 -metil -1 -oxobutil) -4 -s -butil -6',6' -dimetilpirano(2',3':5,6) -cumarina e 7 -hidroxi -8 -(2 -metil -1 -oxobutil) -4 -s -butil -6',6'dimetilpirano(2',3':5,6) -cumarina. Além dessas substâncias foram isolados ainda o d-tocotrienol, a friedelina, o 24a -etilcolest -5 -en -3 -ona e o 24a -etilcolest -5,22 -dien -3 -ol. Estes compostos foram identificados através de suas propriedades espectroscópicas e por comparação de seus dados espectroscópicos com dados da literatura. Three xanthones and six coumarins were isolated from the hexane extract of the stems of Kielmeyera lathrophyton, among them two new prenylated xanthones 1,5-dihydroxy -6'-methyl -6' -(4-methyl -3-pentenyl) -pyrano(2',3':3,2) -xanthone, 1,7 -dihydroxy -6' -methyl -6' -(4 -methyl -3 -pentenyl) -pyrano(2',3':3,2) -xanthone, and two new 4 -s -butylcoumarins 7 -hydroxy -8 -(3-methyl -1 -oxobutyl) -4 -s -butyl -6',6' -dimethylpyrano (2',3':5,6) -coumarin, 7 -hydroxy -8 -(2-methyl -1 -oxobutyl) -4 -s -butyl -6',6' -dimethylpyrano (2',3':5,6) -coumarin, along with the compounds, d -tocotrienol, friedelin, 24a -ethylcholest -5 -en -3 -one, and , 24a -ethylcholest -5,22 -dien -3 -ol. These compounds were identified by comparison with literature data, and their spectroscopic properties.
