Phytochemical reinvestigation of Tabebuia argentea leaves and Catalpa bignonioides petioles extracts (Bignoniaceae) allowed to isolate two compounds not described before: one glycosylated lignan and one phenolic glycoside characterized as 5-hydroxysesamin 5-O-beta-D-glucopyranosyl-(1 -> 2)-[beta-D-glucopyranosyl-( 1 -> 6)]-beta-D-glucopyranoside (1) and 1-benzyl-[6-p-hydroxybenzoyl]-beta-D-glucopyranosyl( 1 -> 3)-beta-D-glucopyranoside (2), respectively. Their structural characterization was obtained on the basis of extensive NMR spectral studies. Five known phenolic glycosides along with six flavonol glycosides were also isolated and characterized
Phenolic glycosides from Tabebuia argentea and Catalpa bignonioides
DE TOMMASI, Nunziatina
2014
Abstract
Phytochemical reinvestigation of Tabebuia argentea leaves and Catalpa bignonioides petioles extracts (Bignoniaceae) allowed to isolate two compounds not described before: one glycosylated lignan and one phenolic glycoside characterized as 5-hydroxysesamin 5-O-beta-D-glucopyranosyl-(1 -> 2)-[beta-D-glucopyranosyl-( 1 -> 6)]-beta-D-glucopyranoside (1) and 1-benzyl-[6-p-hydroxybenzoyl]-beta-D-glucopyranosyl( 1 -> 3)-beta-D-glucopyranoside (2), respectively. Their structural characterization was obtained on the basis of extensive NMR spectral studies. Five known phenolic glycosides along with six flavonol glycosides were also isolated and characterizedI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
