Autor(es): Guedes, Maria L. S. ; Cruz, Frederico Guare ; Silva Neto, José T. da ; Guedes, Maria L. S. ; Cruz, Frederico Guare ; Silva Neto, José T. da
Data: 2014
Origem: Oasisbr
Assunto(s): Kielmeyera lathrophyton; Guttiferae; Xanthones; 4-alkylcoumarins; 4-phenylcoumarins; Neoflavonoids
p. 117-122
Submitted by Edileide Reis (leyde-landy@hotmail.com) on 2014-02-05T11:34:01Z No. of bitstreams: 1 Maria L. S. Guedes.pdf: 49340 bytes, checksum: ed9adf6a0606c0c5a7afb4faaa39e3dd (MD5)
Approved for entry into archive by Alda Lima da Silva (sivalda@ufba.br) on 2014-02-21T18:56:19Z (GMT) No. of bitstreams: 1 Maria L. S. Guedes.pdf: 49340 bytes, checksum: ed9adf6a0606c0c5a7afb4faaa39e3dd (MD5)
Made available in DSpace on 2014-02-21T18:56:19Z (GMT). No. of bitstreams: 1 Maria L. S. Guedes.pdf: 49340 bytes, checksum: ed9adf6a0606c0c5a7afb4faaa39e3dd (MD5) Previous issue date: 2001
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.
