Tannins and Related Polyphenols of Melastomataceous Plants. II. Nobotanins B, C and E, Hydrolyzable Tannin Dimer and Trimers from Tibouchina semidecandra COGN.

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

doi:10.1248/cpb.39.2264

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

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Keywords: Tibouchina semidecandra, Melastomataceae, tannin, ellagitannin oligomer, nobotanin B, nobotanin C, nobotanin E

JOURNAL FREE ACCESS

1991 Volume 39 Issue 9 Pages 2264-2270

DOI https://doi.org/10.1248/cpb.39.2264

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Abstract

The structures of three new hydrolyzable tannin oligomers, nobotanins B (7), C (20) and E (21), which were isolated from the leaves of Tibouchina semidecandra COGN. (Melastomataceae), have been elucidated on the basis of spectral and chemical evidence. Nobotanin B is an isomer of a co-existing dimer, nobotanin F, and nobotanins C and E are trimers possessing the nobotanin B moiety as a partial structure.

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