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13C-NMR. Analysis of the Roxburghines |
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| Authors: | Lucio Merlini Rosanna Mondelli Gianluca Nasini Felix W. Wehrli Edward W. Hagaman Ernest Wenkert |
| Abstract: | The 13C shifts of the alkaloids roxburghine B, C, D and E are determined. They confirm the following configurations for the last three bases: C(18α)-normal, C(18α)-pseudo and C(18β)-pseudo, respectively. Roxburghine B is shown to be a C(18β)-epi-allo isomer. |
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