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3-Oxo-friedelan-20α-OIC acid from gymnosporia emarginata |
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| Authors: | Parimi Atchuta Ramaiah Parimi Uma Devi Felix Frolow David Lavie |
| Institution: | Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot, Israel |
| Abstract: | 3-Oxo-friedelan-20α-oic acid, named as maytenonic (polpunonic) acid, has been isolated along with β-amyrin and sitosterol from Gymnosporia emarginata. 1H and 13C NMR signals have been assigned for the structure. X-ray analysis of the single crystal confirmed that the carboxylic acid is α-oriented at C-20 and the D/E rings of this D:A-friedo-oleanane are in chair-chair conformation. 13C NMR data of the present compound also enabled the assignment of the C-20α- and β-methyl carbons in friedelin. |
| Keywords: | Celastraceae β-amyrin D:A-friedo-oleananes friedelin 3-oxo-friedelan-20α-oic acid maytenonic acid polpunonic acid sitosterol |
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