Bisrubescensins A-C: three new dimeric ent-kauranoids isolated from isodon rubescens |
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Authors: | Huang Sheng-Xiong Xiao Wei-Lie Li Li-Mei Li Sheng-Hong Zhou Yan Ding Li-Sheng Lou Li-Guang Sun Han-Dong |
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Institution: | State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, P. R. China. |
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Abstract: | reaction: see text] A phytochemical study of the secondary metabolites produced by the species of Isodon rubescens has led to the isolation of three new dimeric ent-kauranoids and two known ones. The most important of these compounds are bisrubescensin A (1), which contains an unprecedented C(23) ent-kaurane unit, and bisrubescensin C (3), which is the precursor of bisrubescensin B (2) from the viewpoint of biosynthesis. Their structures were determined on the basis of extensive spectroscopic analysis and chemical evidence. |
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