%0 Journal Article
%T Triterpenoid saponins from stem bark of Pentaclethra macroloba
%A Viana
%A Francisco Arnaldo
%A Braz-Filho
%A Raimundo
%A Pouliquen
%A Yvone B. M.
%A Andrade Net
%A Manoel
%A Santiago
%A Gilvandete M. P.
%A Rodrigues-Filho
%A Edson
%J Journal of the Brazilian Chemical Society
%D 2004
%I Sociedade Brasileira de Qu¨ªmica, SBQ
%R 10.1590/S0103-50532004000400024
%X two new and two known triterpenoid saponins were isolated from the stem bark of pentaclethra macroloba. their structures were determined using a combination of homo- (1d 1h nmr, 13c nmr-hbbd and 13c nmr-dept) and heteronuclear 2d nmr techniques (1h-1h-cosy, 1h-1h-tocsy, 1h-1h-noesy, hmqc and hmbc), esims and chemical methods. the structures of the two new pentacyclic triterpenoid saponins were established as 3b-o-{[b-d-glucopyranosyl-(1£¿3)-a-l-rhamnopyranosyl-(1£¿2)],b-d- glucopyranosyl-(1£¿4)}-a-l-arabinopyranosylhederagenin (3) and 3b-o-{[b-d-glucopyranosyl-(1£¿4)-b-d-glucopyranosyl-(1£¿3)-a-l-rhamnopyranosyl- (1£¿2)],b-d- glucopyranosyl(1£¿4)}-a-l-arabinopyranosyloleanolic acid (4).
%K pentaclethra macroloba
%K mimosoideae
%K pentacyclic triterpenoid saponins.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532004000400024&lng=en&nrm=iso&tlng=en