Tannins and related compounds. LV Isolation and characterization of acutissimins A and B, novel tannins from Quercus and Castanea species.

K ISHIMARU, GENI NONAKA, I NISHIOKA

文献索引：Ishimaru, Kanji; Nonaka, Gen-Ichiro; Nishioka, Itsuo Chemical and Pharmaceutical Bulletin, 1987 , vol. 35, # 2 p. 602 - 610

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被引用次数: 49

摘要

Two novel and closely related tannins, designated as acutissimins A (1) and B (2), have been isolated from various Fagaceous plants: Quercus acutissima, Q. miyagii, Q. stenophylla, Q. mongolica var. grosseserrata and Castanea crenata. Degradative and synthetic studies combined with 1 H-and 13 C-NMR spectrometry and various mass spectral measurements have permitted the assignments. of the structures, in which (+)-catechin (4) ...