Puberunine and puberudine, two new C18-diterpenoid alkaloids from Aconitum barbatum var. puberulum |
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Authors: | Mu Zhen-Qiang Gao Hao Huang Zhi-Yun Feng Xiao-Lin Yao Xin-Sheng |
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Affiliation: | College of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, People's Republic of China. |
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Abstract: | Two C(18)-diterpenoid alkaloids, puberunine (1) and puberudine (2), together with four other new alkaloids, including the first examples having β-oriented substitution at C-3 and a rare chloro-substituent were isolated from Aconitum barbatum var. puberulum. Their structures were elucidated by spectroscopic methods. Puberunine and puberudine, which possess a unique rearranged E ring and an opened A ring, respectively, represent new subtypes of the C(18)-diterpenoid alkaloids. A plausible biosynthetic pathway of 1 and 2 was proposed. |
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