Tannins and Related Polyphenols of Lythraceous Plants. Part2. Woodfordin D and Oenothein A, Trimeric Hydrolyzable Tannins of Macro-Ring Structure with Antitumor Activity.
trimeric hydrolyzable tannins, woodfordin D (5) and oenothein A (13), were isolated from the dried flowers of Woodfordia fruticosa, and their macrocyclicstructures, which have a novel constituent unit (woodfordinoyl group) connecting the monomers, have been elucidated on the basis of spectral and chemical evidence. Oenothein A (13) was also isolated from the leaves of Oenothera biennis.
A New Trimeric Hydrolyzable Tannin, Oenotherin T2, Isolated from Aerial Parts of Oenothera tetraptera Cav.
作者:Tsutomu Hatano、Shoko Taniguchi、Yoko Imayoshi、Takashi Yoshida
DOI:10.3987/com-08-s(d)26
日期:——
A new hydrolyzable tannin, oenotherin T-2, was isolated from the aerial parts of Oenothera tetraptera Cav., together with 15 known polyphenolic compounds. The trimeric structure of oenotherin T-2 was elucidated based on spectroscopic data and chemical correlation with oenotherin T-1.
A macrocyclic ellagitannin trimer, oenotherin T1, from Oenothera species
作者:Shoko Taniguchi、Yoko Imayoshi、Ryoko Yabu-uchi、Hideyuki Ito、Tsutomu Hatano、Takashi Yoshida
DOI:10.1016/s0031-9422(01)00435-6
日期:2002.1
Oenotherin T-1 was isolated from leaves of Oenothera tetraptera as a major ellagitannin. Its structure, that of a macrocyclic trimer with a new acyl group, an isodehydrovaloneoyl group, was established. This compound was also produced by callus tissues induced from O. laciniata leaves. (C) 2002 Published by Elsevier Science Ltd.