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Artigo Acesso aberto Produção Nacional Revisado por pares
BIBTEX RIS

Triterpenoid saponins from stem bark of Pentaclethra macroloba

2004; Brazilian Chemical Society; Volume: 15; Issue: 4 Linguagem: Inglês

10.1590/s0103-50532004000400024

ISSN

1678-4790

Autores

Francisco Arnaldo Viana, Raimundo Braz‐Filho, Yvone B.M. Pouliquen, Manoel Andrade Net, Gilvandete M. P. Santiago, Edson Rodrigues‐Filho,

Tópico(s)

Plant biochemistry and biosynthesis

Resumo

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 3beta-O-{[beta-D-glucopyranosyl-(1->3)-alpha-L-rhamnopyranosyl-(1->2)],beta-D- glucopyranosyl-(1->4)}-alpha-L-arabinopyranosylhederagenin (3) and 3beta-O-{[beta-D-glucopyranosyl-(1->4)-beta-D-glucopyranosyl-(1->3)-alpha-L-rhamnopyranosyl- (1->2)],beta-D- glucopyranosyl(1->4)}-alpha-L-arabinopyranosyloleanolic acid (4).

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