Isolation and structure elucidation of tabercetimines A-D, four new quaternary monoterpenoid indole alkaloids from Tabernaemontana divaricata
2021
Zhu, Wen-Tao | Chen, Chen | Zhao, Qian | Han, Ling-Ling | Yang, Min | Hao, Xiao-Jiang | Zhang, Yu
Tabercetimines A-D, four new quaternary monoterpenoid indole alkaloids with rare skeleton characterized by a quinuclidine moiety were isolated from the stems of Tabernaemontana divaricata. The structures and their absolute configurations were elucidated by extensive analysis of MS, NMR, ECD, and X-ray diffraction. A plausible biogenetic pathway of 1 was also proposed.
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