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Leonurine structure.png
IUPAC name
4-(Diaminomethylideneamino)butyl 4-hydroxy-3,5-dimethoxybenzoate
3D model (JSmol)
ECHA InfoCard 100.208.686
Molar mass 311.338 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Leonurine is a pseudoalkaloid that has been isolated from Leonotis leonurus, Leonotis nepetifolia, Leonotis artemisia, Leonurus cardiaca (Motherwort), Leonurus sibiricus, as well as other plants of family Lamiaceae. Leonurine is easily extracted into water.[1]

Chemical synthesis[edit]

Leonurine can be synthesized starting from eudesmic acid. Reaction with sulfuric acid produces syringic acid. Protection with ethyl chloroformate followed by reaction with thionyl chloride SOCl2 and then tetrahydrofuran yields 4-carboethoxysyringic acid 4-chloro-1-butyl ester. The chloride is then converted to an amino group via a Gabriel synthesis with potassium pthalimide) followed by hydrazinolysis (Ing–Manske procedure). The final step is reaction of the amine with S-methylisothiourea hemisulfate salt.

Leonurine synthesis[1]


  1. ^ a b "The Leonurine and its preparation". An Hui New Star Pharmaceutical Development Co. 2008. Archived from the original on 2008-05-15. Retrieved 2008-08-28. Cite uses deprecated parameter |deadurl= (help)

Further reading[edit]