New acetylated flavone C-glycosides from Iris lactea |
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| Authors: | Andrei K. Whaley Weaam Ebrahim Mona El-Neketi Elena U. Ancheeva Ferhat Can Özkaya Nina I. Pryakhina Nadezhda U. Sipkina Vladimir G. Luzhanin Zhen Liu Peter Proksch |
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| Affiliation: | 1. Institute of Pharmaceutical Biology and Biotechnology, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany;2. Saint Petersburg State Chemical Pharmaceutical Academy, Street Prof. Popova 14, 197376 Saint Petersburg, Russian Federation;3. Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura 35516, Egypt |
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| Abstract: | Chemical investigation of the aerial parts of Iris lactea afforded three new flavone C-glycosides including 4?-O-acetyl-embinin (1), 2?,4?-O-diacetyl-embinin (2) and 6″,4?-O-diacetyl-embinin (3) along with the known analogue embinin (4). Their structures were elucidated by 1D and 2D NMR spectroscopic analysis as well as by HRESIMS data. The sugars were characterized following acid hydrolysis of the respective glycosides and TLC analysis compared to known standards. Duplicated signals can be observed in the NMR spectra, indicating the presence of rotamers caused by rotational hindrance around the glycosyl-flavone C | |
| Keywords: | Rotamers Corresponding authors. |
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