Structure determination of ursene-type triterpenes by NMR techniques |
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| Authors: | Ahmed Zaheer Ali Dildar Malik Abdul |
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| Affiliation: | International Center for Chemical Sciences, H.E.J. Research Institute of Chemistry, University of Karachi, 75270-Karachi, Pakistan. zaheer_hej@mail.com |
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| Abstract: | Two new ursene-type triterpenes, nudicauline A and nudicauline B, have been isolated from Launaea nudicaulis. Their structures have been assigned as 3beta-hydroxy-urs-11-ene (1) and 3beta-acetyl-urs-11-ene (2), respectively, by extensive NMR studies. In addition, olean-11,13(18)-diene (3), 3beta-hydroxy-13(28)-epoxy-urs-11-ene (4) and 3-keto-13(28)-epoxy-urs-11-ene (5) are also reported for the first time from this species. |
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