Two novel tetracycles,cassibiphenols A and B from the flowers of Cassia siamea |
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| Authors: | Jun Deguchi Tadahiro Sasaki Yusuke Hirasawa Toshio Kaneda Idha Kusumawati Osamu Shirota Hiroshi Morita |
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| Institution: | 1. Faculty of Pharmaceutical Sciences, Hoshi University, Ebara 2-4-41, Shinagawa-ku, Tokyo 142-8501, Japan;2. Faculty of Pharmacy, Airlangga University, Jalan Dharmawangsa Dalam, Surabaya 60286, Indonesia;3. Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki City, Kagawa 769-2193, Japan |
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| Abstract: | Chemical investigation of the flowers of Cassia siamea (Leguminosae), resulted in the isolation of two novel tetracycles connecting 5-(2-hydroxypropyl)benzene-1,3-diol, cassibiphenols A (1) and B (2). The structures were elucidated by analysis of the 1D, 2D NMR, and HRMS spectra. Synthesis of a tetracyclic core of 1 and 2 led to determine the absolute configuration of 1 and C-12 of 2. |
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| Keywords: | Cassia siamea Cassibiphenols A and B Biphenyl Structure elucidation Partial synthesis |
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