Tannins and Related Polyphenols of Melastomataceous Plants. I. Hydrolyzable Tannins from Tibouchina semidecandra COGN.

Takashi YOSHIDA; Hideyuki OHBAYASHI; Kohkichi ISHIHARA; Wakayo OHWASHI; Kumiko HABA; Yoshiaki OKANO; Tetsuro SHINGU; Takuo OKUDA

doi:10.1248/cpb.39.2233

Takashi YOSHIDA, Hideyuki OHBAYASHI, Kohkichi ISHIHARA, Wakayo OHWASHI, Kumiko HABA, Yoshiaki OKANO, Tetsuro SHINGU, Takuo OKUDA

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Keywords: Tibouchina semidecandra, Melastomataceae, tannin, dimeric ellagitannin, methylvescalagin, nobotanin A, nobotanin D, nobotanin F

JOURNAL FREE ACCESS

1991 Volume 39 Issue 9 Pages 2233-2240

DOI https://doi.org/10.1248/cpb.39.2233

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Abstract

Four new hydrolyzable tannins, methylvescalagin and nobotanins, A, D and F, along with eleven known polyphenolics, have been isolated from the leaves of Tibouchina semidecandra COGN. Based on spectral and chemical evidence, nobotanin D was characterized as 1, 6-di-O-galloyl-2, 3-O-(S)-hexahydroxydiphenoyl-β-D-glucose (16), and the structures of nobotanins A (17) and F (18) were established as dimeric hydrolyzable tannins possessing a valoneoyl group as a linking unit between the monomers.

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