As cumarinas do pterocaulon balansae, Chodat
AUTOR(ES)
Simone Maria Gonçalves de Barros
DATA DE PUBLICAÇÃO
1981
RESUMO
Starting from an hexane/ethyl ether extract of the aereal parts of Pterocaulon balansae, Chodat, we isolated the five following coumarins: 5-(3 -methyl-2 ,3 -butenyloxy)-6,7-methylenedioxycoumarin; 5-(2 ,3 -epoxy-3 -methylbutyloxy)-6,7-methylenedioxycoumarin; 5-(2 ,3 -dihydroxy-3 -methylbutyloxy)-6,7-methylenedioxycoumarin; 6-methoxy-7-(2 ,3 -epoxy-3 -methylbutyloxy)coumarin; and 6-methoxy-7-(3 -methyl-2 ,3 -dihydroxybutyloxy)coumarin. Three of these coumarins are new. The structures of these coumarins were determined by the usual spectroscopic methods, and by chemical methods. A study of two of the coumarins using carbon-13 magnetic resonance emphasizes the substituent effects upon the carbon chemical shifts, allowing the precise allocation of these substituents on the coumarin ring.
ASSUNTO(S)
analise cromatografica quimica organica plantas
ACESSO AO ARTIGO
http://libdigi.unicamp.br/document/?code=vtls000052719Documentos Relacionados
- Quantificação de cumarinas em extratos de pterocaulon balansae (asteracea) com atividade anti-fúngica
- As cumarinas de Pterrocaulon lanatum O.Kuntze e sintese de cumarinas trioxigenadas
- Poliacetilenos do genero Pterocaulon
- Pau-Ferro-do-Sul (Myracrodruon balansae).
- Antileishmanial metabolites from Lantana balansae
