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Lonimacranaldes A-C, three iridoids with novel skeletons from Lonicera macranthoides
Yu-Dan Mei1,2, Hai-Bo Li3, Qian-Qian Pang1
1Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University Guangzhou 510632 P. R. China 1018yuyang@163.com tyaoxs@jnu.edu.cn +86-20-85221559 +86-20-85221559.
Abstract:
Lonimacranaldes A and B (1 and 2), along with one biogenetically related intermediate, lonimacranalde C (3), were isolated from the flower buds of Lonicera macranthoides. Characterized by an iridoid structure and an additional C-6 unit with an aldehyde group, compounds 1 and 2 are the first examples of hybrid iridoids possessing an unexpected 6/5/6 fused tricyclic ring system, while compound 3 serves as an important precursor for their generation. The structures of lonimacranaldes A-C (1-3) were revealed by extensive spectroscopic and X-ray diffraction analyses. A plausible biogenetic pathway for them was proposed. Compound 3 showed anti-inflammatory activities by inhibiting the production of IL-6 on LPS-induced RAW 264.7 cells with an IC50 value of 6.33 μM.
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