Phenolic Constituents from the Roots of Rosa taiwanensis Nakai (I)

Abstract

Phytochemical investigation of the polyphenols present in the root of Rosa taiwanensis led to the isolation of fifteen compounds (1-15). These compounds were identified by their spectral data as well as by direct comparison with data in the literature and with authentic samples. Compound 1 was established as gallic acid 3-O-(6'-O-galloyl)-β-D-glucopyranoside (1). Compounds 2-6 were found to he hydrolyzable tannins possessing a glucose core: 1,6-di-O-galloyl-β-D-glucopyra-nose (2), strictinin (3), 2,3-(S)-HHDP-D-glucopyranose (4), 2,3-(S)-HHDP-6-O-galloyl-D-glucopyranose (5) and pedunculagin (6). Compounds 7-10 were condensed tannins: catechin (7), procyanidin B-1 (8), procyanidin B-3 (9) and procyanidin B-3 3-O-gallae (10). Compounds 11-13, all possessing an open-chain glucose group, were identified as casuarinin (11), casuariin (12) and punicacortein A (13). Compounds 14 and 15 were established as stenophyllinins A and B, respectively. These complex tannins (14 and 15) were isolated for the first time from a Rosaceae plant.