Tannins and Related Compounds. XCIV. : Isolation and Characterization of Seven New Hydrolyzable Tannins from the Leaves of Macaranga tanarius (L.) MUELL. et ARG.

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A chemical examination of the tannins in the leaves of Macaranga tanarius (L.) MUELL. et ARG. (Euphorbiaceae) has led to the isolation of seven new hydrolyzable tannins (22-28), together with twenty-one known tannins (1-21). On the basis of chemical and spectroscopic evidence, the structures of compounds 22-28 were established as 1, 4-di-O- galloyl-α-D-glucopyranose (22), 3, 4-di-O-galloyl-D-glucopyranose (23), galloylpunicafolin (24), galloylgeraniin (25), 1-O- galloyl-3-O-brevifolincarboxyl-β-D-glucopyranose (26), 1, 2, 4-tri-O-galloyl-3, 6-(S)-hexahydroxydiphenoyl-β-D-glucopyranose (macaranganin) (27) and 1, 2, 4-tri-O-galloyl-3, 6-(R)-dehydrohexahydroxydiphenoyl-β-D-glucopyranose (tanarinin) (28).