Tannins and Related Polyphenols of Lythraceous Plants: III: Hydrolyzable Tannin Oligomers with Macrocyclic Structures, and Accompanying Tannins from Woodfordia fruticosa kurz

Abstract

Besides previously reported hydrolyzable tannin oligomers (woodfordins A—D), a new hydrolyzable tannin monomer [isoschimawalin A (7)] and five oligomers (woodfordins E—I) have been isolated from the dried flowers of Woodfordia fruticosa (an Indonesian crude drug, Sidowaya), and their structures elucidated on the basis of spectra and chemical evidence. Woodfordins G (14) and H (15) were characterized as dimers with structures related to woodfordin B (2). Woodfordins I (16), E (23) and F (24) were a macrocyclic dimer, trimer and tetramer, respectively. © 1992, The Pharmaceutical Society of Japan. All rights reserved.