Triterpenoid saponins from stem bark of Pentaclethra macroloba

Journal of the Brazilian Chemical Society

Braz-Filho, Raimundo¹  Universidade Federal de São Carlos, São Carlos -, Brazil¹  Pouliquen, Yvone B. M.¹  Rodrigues-Filho, Edson¹  Universidade Federal do Ceará, Fortaleza, Brazil¹  Viana, Francisco Arnaldo¹  Andrade Net, Manoel¹  Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, Brazil¹  Santiago, Gilvandete M. P.¹  Universidade do Estado do Rio Grande do Norte, Mossoró, Brazil¹ 

关键词: Pentaclethra macroloba;    Mimosoideae;    pentacyclic triterpenoid saponins;   

DOI  :  10.1590/S0103-50532004000400024

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

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).

【 授权许可】

Unknown