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22 indole alkaloids were isolated from the stem bark of Nigerian Rauwolfia vomitoria and 20 characterized. The alkaloids comprised E-seco heteroyohimbine, sarpagan, dihydroindole, yohimbine and heteroyohimbine types. The biosynthetic relationship of the alkaloids is discussed. 相似文献
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24 indole alkaloids were isolated from the stem bark of Rauwolfia cumminsii and 21 identified. The alkaloids comprised E-seco, sarpagan, dihydroindole, yohimbine, heteroyohimbine, 18-hydroxyyohimbine ester and anhydronium types together with peraksine and deacetylpicraline. The probable biosynthesis of the alkaloids is discussed. 相似文献
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Twenty-one indole alkaloids were isolated from the leaves of Rauwolfia oreogiton and identified. The alkaloids comprised E-seco heteroyohimbine, heteroyohimbine, akuammiline, akuammicine, pleiocarpamine, picraline, picrinine, dihydroindole and sarpagan types. No chemical differentiation between the leaves of R. oreogiton and R. volkensii could be established. 相似文献
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Thirty-three indole alkaloids were isolated from the root bark of Rauwolfia nitida. Sarpagan, dihydroindole, indolenine, yohimbine, 18-hydroxy-yohimbine ester, heteroyohimbine and anhydronium base types were isolated. The principal alkaloids were reserpine (0.034%), serpentinine (0.033%), pseudoreserpine (0.013%) and reserpiline (0.012%). 相似文献
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