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15-O-Deacetylrhaposerin and rhaserin -- new components of a lactone mixture from Rhaponticum serratuloides |
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| Authors: | Berdin A G Raldugin V A Shakirov M M Bagryanskaya I Yu Gatilov Yu V Druganov A G Kulyyasov A T Adekenov S M Habdolda G Tolstikov G A |
| Institution: | (1) Institute of Phytochemistry, Ministry of Education and Sciences Kazakhstan Republic, 4 ul. Gazalieva, 470032 Karaganda, Kazakhstan;(2) N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences, 9 prosp. Acad. Lavrent"eva, 630090 Novosibirsk, Russian Federation |
| Abstract: | As part of our continuing studies of lactones from the aerial part of the plant Rhaponticum serratuloides, 15-O-deacetylrhaposerin and new guaianolide called rhaserin were isolated along with the well-known loliolide. The configuration of the C(17) asymmetric center in 15-O-deacetylrhaposerin was established by X-ray diffraction analysis. The molecular structure of rhaserin was determined based on the data from 1H and 13C NMR spectroscopy (including 2D NMR spectroscopy) of this lactone and its 4,15-O-isopropylidene derivative. |
| Keywords: | sesquiterpenoids guaianolides 15-O-deacetylrhaposerin rhaserin acetonides 2D NMR spectroscopy X-ray diffraction analysis HPLC |
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