Tannins and Related Compounds. LXXXIII. : Isolation and Structures of Hydrolyzable Tannins, Phillyraeoidins A-E from Quercus phillyraeoides

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A chemical examination of the leaves of Quercus phillyraeoides A. GRAY (Fagaceae) has led to the isolation of five new tannins, phillyraeoidins A-E (27-31), together with twenty-six structurally known tannins and related compounds including gallotannins (1,2), ellagitannins (3-14), proanthocyanidins (15-17), complex tannins (18-21) and simple phenol glucoside gallates (22-26). On the basis of spectroscopic and chemical evidence, the structures of phillyraoidins A-D have been established as dimeric hydrolyzable tannins in which two glucose units are linked through a valoneayl ester bond, while phillyraeoidin E was characterized as 1,2,3,6-tetra-O-galloyl-4-valoneayl(lactone)-β-D-glucose.
公益社団法人日本薬学会の論文
1989-08-25

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