Imidazole alkaloids
File:Imidazol.svg, the basic structure of imidazole alkaloids]]
Imidazole alkaloids are a group of alkaloids whose basic structure contains the imidazole ring system.{{RömppOnline|ID=RD-09-00231|Name=Imidazol-Alkaloide|Abruf=2020-05-27}}
Occurrence
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File:Leather star fish.jpg In nature, imidazole alkaloids are found both as secondary plant compounds and as byproducts of histidine metabolism in marine organisms. One well-known imidazole alkaloid is pilocarpine, which is present in the leaves of Paraguay jaborandi.
For instance, from the seeds of garden cress (Lepidium sativum), various monomeric imidazole alkaloids can be isolated, including semilepidinoside A and semilepidinoside B, as well as dimeric forms such as lepidins B, C, D, E, and F.Ulrich H. Maier, Heidrun Gundlach, Meinhart H. Zenk: Seven imidazole alkaloids from Lepidium sativum. In: Phytochemistry. 49, 1998, S. 1791–1795, {{doi|10.1016/S0031-9422(98)00275-1}}. In the sponge Leucetta chagosensis, a variety of imidazole alkaloids, such as 2-deoxy-2-aminokealiiquinone and Naamine C, have been identified.Xiong Fu, John R. Barnes, Trang Do, Francis J. Schmitz: New Imidazole Alkaloids from the Sponge Leucetta chagosensis. In: Journal of Natural Products. 60, 1997, S. 497–498, {{doi|10.1021/np960694i}}. Imbricatin has been isolated from the starfish Dermasterias imbricata, while martensin A has been obtained from the red alga Martensia fragilis. Notably, the marine sponge Pseudaxinyssa contains odilin.
The Maca plant contains relevant amounts of lepidilin.
Representative
A well-known imidazole alkaloid is pilocarpine. Other representatives include. cynodin, cynometrin and odilin.
(+)-Pilocarpine Structural Formula V2.svg|(+)-Pilocarpine
Cynodine Structural Formula V2.svg|Cynodine
Cynometrine Structural Formula V1.svg|Cynometrine
Odiline Structural Formula V2.svg|Odiline
Websites
- [https://www.spektrum.de/lexikon/biochemie/imidazolalkaloide/3062 Imidazole Alkaloids]. In Encyclopedia of Biochemistry, at spektrum.de. Retrieved September 29, 2019.