New C(28) steroidal glycosides from Tubocapsicum anomalum |
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Authors: | Kiyota Naoko Shingu Kazushi Yamaguchi Koki Yoshitake Yasuyuki Harano Kazunobu Yoshimitsu Hitoshi Miyashita Hiroyuki Ikeda Tsuyoshi Tagawa Chie Nohara Toshihiro |
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Institution: | Faculty of Medical and Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan. |
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Abstract: | Two new C(28) steroidal glycosides, tuboanosides A (1) and B (2), were isolated from the fruit of Tubocapsicum anomalum MAKINO. Their chemical structures were elucidated on the basis of spectroscopic and X-ray diffraction analysis of the p-bromobenzoyl derivative (4) of tuboanosigenin (3), the sapogenol derivative of these two glycosides. Tuboanosides have the structural peculiarity of an unusual side chain carrying an unusual linkage with a C-21 bound to C-25 on the lactone ring. |
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