%0 Journal Article
%T Saponins and Sapogenins from Brachiaria decumbens Stapf
%A Pires
%A Viviane S.
%A Taketa
%A Alexandre T. C.
%A Gosmann
%A Grace
%A Schenkel
%A Eloir P.
%J Journal of the Brazilian Chemical Society
%D 2002
%I Sociedade Brasileira de Qu¨ªmica, SBQ
%R 10.1590/S0103-50532002000200002
%X four steroidal saponins and three sapogenins were identified from aerial parts of brachiaria decumbens. their structures were established by chemical and spectroscopic means (1h and 13c nmr, hmbc, hmqc) as 3b-methoxy-lanost-9(11)-ene (1), diosgenin (2a), yamogenin (2b), 3-o-b-d-glucopyranosyl-24(s)-ethyl-22e -dihydrocholesterol (3a), 3-o-b-d-glucopyranosyl-24(r)-ethyl-22e -dihydrocholesterol (3b), dioscin (4a) and 3-o-{a-l-rhamnopyranosyl-(1£¿4)-[a-l-rhamnopyranosyl-(1 £¿2)]-b-d-glucopyranosyl}-25(s)-spirost-5-en-3 b-ol (4b). all these compounds were isolated for the first time from b. decumbens and compound 4b is described for the first time as far as we know.
%K brachiaria decumbens
%K steroidal saponins
%K dioscin
%K diosgenin
%K yamogenin
%K triterpene.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532002000200002&lng=en&nrm=iso&tlng=en