期刊
STEROIDS
卷 72, 期 3, 页码 270-277出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.steroids.2006.11.017
关键词
phytoecdysteroid; Ajuga nipponensis Makino; NMR; 22-dehydrocyasterone 2-glucoside; ajugacetalsterone A; ajugacetalsterone B
An extract from aerial parts of Ajuga nipponensis Makino was examined by high performance liquid chromatography for minor ecdysteroids. Along with the compounds already reported, namely cyasterone, ajugasterone C, cyasterone 22-acetate and 22-dehydrocyasterone, the presence of three additional bands with the expected ecdysteroid-like UV absorption was observed. The structures of the isolates were unambiguously elucidated based on extensive NMR spectral studies (one and two-dimensional experiments) and pointed out three new phytoecdysteroids. one of the new compounds, 22-dehydrocyasterone 2-glucoside is just the second example of a C-2 glucosyl derivative. The other two compounds displayed hemiacetal functions in the side chain, one unprecedented, and were named ajugacetalsterone A and B. (c) 2006 Elsevier Inc. All rights reserved.
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