Structure elucidation and NMR assignments of new spirosolane alkaloids from Solanum campaniforme |
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Authors: | Maria Conceição M. Torres José Gustavo L. Almeida Raimundo Braz‐Filho Edilberto R. Silveira Otília Deusdênia L. Pessoa |
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Affiliation: | Departamento de Química Organica e Inorganica, Universidade Federal do Ceará, , Fortaleza‐CE, 60.021‐970 Brazil |
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Abstract: | From the leaves of Solanum campaniforme, two new spirosolane alkaloids β‐acetoxyl‐(25S)‐22βN‐spirosol‐4‐en‐3‐one (1) and β‐hydroxyl‐(25S)‐22βN‐spirosol‐4‐en‐3‐one (4) were isolated along with two other known alkaloids of the same class (25S)‐22βN‐spirosol‐1,4‐dien‐3‐one (2) and (25S)‐22βN‐spirosol‐4‐en‐3‐one (3), which are reported for the first time as natural products. The structures of all alkaloids were established after an extensive analysis by 1D and 2D NMR spectroscopy (COSY, HSQC, HMBC and NOESY) as well as HRESIMS. Copyright © 2012 John Wiley & Sons, Ltd. |
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Keywords: | 1H NMR 13C NMR Solanum campaniforme spirosolane steroidal alkaloids |
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