Alkamine occurrence

Co-occurrence of Steroidal Sapogenins/Saponins and Alkamines/Glycoalkaloids... 

Occurrence in Non-solanaceous Taxa. Steroidal alkaloids with an intact alka-mine skeleton (sometimes called Solamm alkaloids ) as metabohtes of the plant kingdom are confined to the Solanaceae and to the Liliaceae s.l. (including Melanthiaceae), respectively. In spite of the fact that they are not related (nested within the eudicots and the monocots, respectively) these two famihes share the occurrence of a few alkamines, e.g., solanidine, solasodine (see different footnotes of Table 7.3). 

Fig. 7.20 Three types of steroidal alkamines with two basic centres and their occurrence in the genus Solarium. Highlighted in grey, cyclohemiketal moiety (fuU ketal -OCH or -OCH CH instead of -OH examples in Table 7.3). Dotted lines separate the respective structures given together with their trivial and/or chemical names (above) from the structurally related 5,6-dehydto congener in case of 3-aminospirosolanes and from corresponding isomers in case of 3-amino-22,26-epiminocho-lestanes (below). The 5,6-dehydro derivative of solanocapsine, solanoforthine, is another constituent of S. seaforthianum demonstrating the co-occurrence of different structural types...

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