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Vibsatins A and B, two new tetranorvibsane-type diterpenoids from Viburnum tinus cv. variegatus
Xiu Gao1, Li-Dong Shao, Liao-Bin Dong
1State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201, People's Republic of China.
Abstract:
Vibsatins A (1) and B (2), a pair of 14,15,16,17-tetranorvibsane-type diterpenoids that feature a bicyclo[4.2.1]nonane moiety formed by a new C-13/C-2 bond, were isolated from the twigs and leaves of Viburnum tinus cv. variegatus. The structures and absolute configurations were elucidated by a combination of NMR spectra, optical rotation, and X-ray diffraction experiments. A possible biogenetic pathway is also proposed. Moreover, vibsatin A (1) enhanced the neurite outgrowth of NGF-mediated PC12 cells at a concentration of 10 μM.
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