Triterpenoids from Eugenia grandis: structure elucidation by NMR spectroscopy |
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Authors: | Manoharan Karuppiah Pillai Song Fan Jing Benny Tan Kwong Huat Yang Daiwen |
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Institution: | Department of Chemistry, National University of Singapore, Science Drive 3, 117543 Singapore. |
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Abstract: | A new pentacyclic triterpenoid, 2alpha,3beta-dihydroxylup-12-en-28-oic acid (1) and a rarely encountered pentacyclic triterpenoid, 3beta-hydroxylup-12-en-28-oic acid (2), together with five known compounds, friedelin (3), 3beta-friedelinol (4), betulinic acid (5), oleanolic acid (6) and beta-sitosterol (7) were isolated from the chloroform extract of stem bark of Eugenia grandis (Syn: Syzygium grande). The structure and stereochemistry of the new compound (1) and the rarely encountered compound (2) were established by 1D and 2D NMR spectroscopic techniques. All the above isolated compounds from this plant are reported for the first time. |
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Keywords: | 1H NMR 13C NMR 2D NMR Eugenia grandis Myrtaceae triterpenoids friedelin 3β‐friedelinol β‐sitosterol |
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