The Structures of Claudimerines-A and -B, Novel Bicoumarins from Citrus hassaku

Motoharu JU-ICHI; Yuko TAKEMURA; Masayoshi OKANO; Narihiko FUKAMIYA; Keiichiro HATANO; Yoshinori ASAKAWA; Toshihiro HASHIMOTO; Chihiro ITO; Hiroshi FURUKAWA

doi:10.1248/cpb.44.11

Motoharu JU-ICHI, Yuko TAKEMURA, Masayoshi OKANO, Narihiko FUKAMIYA, Keiichiro HATANO, Yoshinori ASAKAWA, Toshihiro HASHIMOTO, Chihiro ITO, Hiroshi FURUKAWA

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Keywords: bicoumarin, claudimerin-A, claudimerin-B, Citrus hassaku, Rutaceae

JOURNAL FREE ACCESS

1996 Volume 44 Issue 1 Pages 11-14

DOI https://doi.org/10.1248/cpb.44.11

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Abstract

Two novel dimeric coumarins, claudimerin-A (1) and -B (3), were isolated from the roots of Citrus hassaku (Rutaceae). The chemical structures were elucidated by spectroscopic studies and/or single-crystal X-ray analysis. The main structural characteristic is a pyranopyran ring connecting two clausarin (2) units.

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