Affiliation:
1. School of Pharmacy, Henan University of Chinese Medicine, Zhengzhou 450046, China
2. The Engineering and Technology Center for Chinese Medicine Development of Henan Province, Zhengzhou 450046, China
3. Co-Construction Collaborative Innovation Center for Chinese Medicine and Respiratory Diseases by Henan & Education Ministry of P.R. China, Zhengzhou 450046, China
Abstract
Six new compounds, (7R,8S,8′R)-balanophorone (1), (7′S,8′R,8R)-yunnanensin A (2), (3S)-thunberginol C (3), (8R,8′R)-maninsigin B (4), (7S,8R)-4,7,8-dihydroxy-9,9-dimethyl-chroman (5), and 4-hydroxy-1-(4-hydroxy-3-methoxyphenyl)butan-1-one (6), along with eight known compounds (7–14), were isolated from the herbaceous stems of Ephedra intermedia Schrenket C. A. Meyer. Their structures were elucidated based on their spectroscopic (MS, NMR, IR, and UV) data, and their absolute configurations were determined by comparing their calculated and experimental electronic circular dichroic (ECD) spectra. Moreover, compounds 1 and 3–6 were evaluated for their ability to protect human pulmonary epithelial cells (BEAS-2B) from injury induced by lipopolysaccharide (LPS) in vitro. The results showed that compound 6 exhibited a significant protective effect against LPS-induced injury in BEAS-2B, and compound 5 exhibited a slightly protective effect at the concentration of 10 μM.
Funder
National Key Research and Development Program: Major Project for Research of the Modernization of TCM
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