Structure and absolute stereochemistry of tomenphantopin-A and -B two cytotoxic sesquiterpene lactones from elephantopus tomentosus |
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| Affiliation: | 1. School of pharmacy, Daqing Campus of Harbin Medical University, No. 1, Xinyang Rd., Daqing 163319, China;2. The First Affiliated Hospital of Harbin Medical University, No.199, Dazhi Street, Nangang District, Harbin, Heilongjiang 150001, China |
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| Abstract: | The structure and absolute stereochemistry of the new cytotoxic sesquiterpene lactones, tomenphantopin-A and -B, isolated from Elephantopus tomentosus, were determined from spectral data, chemical transformation and single-crystal X-ray analysis. Tomenphantopin-A and -B are two elephantopin-type germacranolides which possess an α-orientation of the oxygen substituent at C-2. |
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