Flavonoids and Triterpenoid Saponins from Pimenta dioica (Merr.) L

• Published in: Natural product communications Vol. 2; no. 9; p. 1934578
• Main Authors: Moharram, Fatma A., Mohamed, Mona A, Marzouk, Mohamed SA, Aboutabl, Elsayed A
• Format: Journal Article
• Language: English
• Published: Los Angeles, CA SAGE Publications 01.09.2007
• Subjects: triterpenoid saponins; Myrtaceae; flavonoids; Pimenta dioica
• ISSN: 1934-578X; 1555-9475
• DOI: 10.1177/1934578X0700200904

The defatted and desalted 80% methanolic extract of the leaves of Pimenta dioica (Mirr.) L. resulted in the isolation of three triterpenoid saponins, 23-hydroxy-3α-[(O-α-L-rhamnopyranosyl-(1→2)-O-α-L-arabinopyranosyl) oxy] olean-12-en-28-oic acid O-α-L-rhamnopyranosyl-(1→4)-O-β-D-galactopyranosyl-(1→6)-O-β-D-galactopyranosyl ester (1), 2α,3α,23-trihydroxyolean-12-en-28-oic acid O-β-D-glucopyranosyl ester (2), and 2α,3α,23-trihydroxyolean-13(18)-en-28-oic acid O-β-D-glucopyranosyl ester (3), along with a novel dihydrokaempferol glucoside, namely, 3-carboxy-6,8-di-C-methyl-dihydrokaempferol 3-O-β-D-glucopyranoside (4), together with three known flavonoids, quercetin 3-O-β-D-glucuronopyranoside (5), quercitrin (6) and mernesitin (7), all for the first time from the genus Pimenta. The structures were identified on the basis of chemical and physicochemical analysis (UV, HRESI-MS, 1 and 2D NMR).