New C28 Steroidal Glycosides from Tubocapsicum anomalum

Naoko Kiyota; Kazushi Shingu; Koki Yamaguchi; Yasuyuki Yoshitake; Kazunobu Harano; Hitoshi Yoshimitsu; Tsuyoshi Ikeda; Toshihiro Nohara

doi:10.1248/cpb.55.34

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New C₂₈ Steroidal Glycosides from Tubocapsicum anomalum

Naoko Kiyota, Kazushi Shingu, Koki Yamaguchi, Yasuyuki Yoshitake, Kazunobu Harano, Hitoshi Yoshimitsu, Tsuyoshi Ikeda, Toshihiro Nohara

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Keywords: Tubocapsicum anomalum, isotubocaposide, C₂₈ steroidal glycoside, isotubocaposigenin, X-ray analysis

JOURNAL FREE ACCESS

2007 Volume 55 Issue 1 Pages 34-36

DOI https://doi.org/10.1248/cpb.55.34

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Abstract

Three new C₂₈ steroidal glycosides, isotubocaposides A (1), B (2), and C (3), were isolated from the fruits of Tubocapsicum anomalum MAKINO. Their chemical structures were elucidated on the basis of spectroscopic and X-ray diffraction analysis of p-bromobenzoyl derivative (5) of isotubocaposigenin (4), the sapogenol derivative of these three glycosides. Isotubocaposides have the structural peculiarity of an unusual side chain carrying a C-21 bound to C-24 on the lactone ring.

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