A new steroid with unique rearranged seven-membered B ring isolated from roots of Asparagus filicinus
2017
Wang, Jia-Peng | Cai, Le | Chen, Feng-Yun | Li, Yuan-Yuan | Li, Yuan-Ya | Luo, Ping | Ding, Zhong-Tao
A novel skeleton steroid aspafilisine (1), which has a unique rearranged seven-membered B ring formed by the C(7)–C(14) linkage were isolated from the roots of Asparagus filicinus. A novel hemiketal derivative (1a) was synthesized to identify the structure of 1. The structures of 1 and 1a were elucidated by 1D and 2D NMR spectra as well as by HRESIMS data. The absolute configuration of 1 was assigned on the basis of ROESY spectrum, comparison with literature and computational methods. A plausible biosynthetic pathway of 1 was also proposed.
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