Chemical constituents of Cordia piauhiensis: Boraginaceae

A new monodesmoside triterpenoid saponin characterized as 3beta-O-alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranosyl pomolic acid, was isolated from Cordia piauhiensis Fresen (Boraginaceae). Its structure was determined by extensive NMR analysis, including ¹H, ¹H-COSY, HMQC, HMBC, and NOESY experiments. In addition, four known triterpenoids: quinovic acid, cincholic acid, cincholic 3beta-O-6-deoxy-beta-D-glucopyranoside acid and quinovic 3beta-O-beta-D-glucopyranoside acid were also isolated.Uma nova saponina triterpênica monodesmosídica, caracterizada como ácido 3beta-O-alfa-L-ramnopiranosil-(1->2)-beta-D-glicopiranosil pomólico, foi isolada de Cordia piauhiensis Fresen (Boraginaceae). Sua estrutura foi determinada através de extensiva análise de métodos de RMN, incluindo os experimentos ¹H, ¹H-COSY, HMQC, HMBC e NOESY. Os triterpenóides ácido quinóvico, ácido cinchólico, ácido 3beta-O-6-deoxi-beta-D-glicopiranosídeo cinchólico e 3beta-O-beta-D-glicopiranosídeo quinóvico foram também isolados