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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 311.34 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 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. 

Further reading[edit]

  • Cheng KF, Yip CS, Yeung HW, Kong YC (May 1979). "Leonurine, an improved synthesis". Experientia. 35 (5): 571–2. doi:10.1007/BF01960323. PMID 446644.