Tannins and related compounds. LII Studies on the constituents of the leaves of Thujopsis dolabrata SIEB. et ZUCC.

Abstract

From the leaves of Thujopsis dolabrata SIEB. et Zucc. (Cupressaceae), four new flavanonol glycosides, the 3-O-β-D-xylopyranosides (1→4) of (+) -taxifolin, (-) -taxifolin, (+) -epitaxifolin and (-) -epitaxifolin, together with (+) -catechin (5), (-) -epicatechin (6) and thirteen oligomeric procyanidins (7-19), were isolated and their chemical structures were characterized by spectroscopic and chemical investigations.