Spirosolanes: Compounds such as tomatidine and solasodine have the basic nitrogen
included into an oxaazaspirane unit that includes the original steroidal side chain.
Solanidine alkaloids: Solanidine biosynthesis involves the intermediates verazine and etioline.
These alkaloids also are usually glycosides.
22,26-Epiminocholestanes: Alkaloids with this structure are intermediates in the biosynthesis of
spirosolane, solanidine, a -epiminocyclohemiacetal, and 3-aminospirostane
3-Aminospirostane alkaloids: Alkaloids of this group, such as juribidine, are probably synthesized
analogously to the corresponding spirostanols, ., tigogenin. The 3-amino group is probably introduced
late in the biosynthesis by transamination.
Biological activity of Solanum alkaloids