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Classification Of Alkaloids As Per Structure
(a) True alkaloids
1. Pyrrole and pyrrolidine: Hygrine, coca species.
2. Pyridine and piperidine: Arecoline, Anabasine, coniine, trigonelline.
3. Pyrrolizidine: Echimidine, symphitine.
4. Tropane (piperidine/N-methyl pyrrolidine): Atropine, hyoscine.
5. Quinoline: Quinine, Quinidine, Chinchonine.
6. Isoquinoline: Morphine, codeine.
7. Aporphine (reduced isoquinoline – Naphthalene): boldine.
8. Indole (Benzpyrole): Vincristine, Ergometrine, Reserpine.
9. Imidazole: Pilocarpine, Isopilocarpine.
10. Norlupiname: Cytisine, Spartine.
11. Purine (pyrimidine/ imidazole): Caffine/ theofronine, theophylline.
12. Steroidal (cyclo pentano per hydro phenathrene ring): Solanidine, Conessine.
(b) Pseudo alkaloids
Diterpenes- Aconitine, Aconine
(c) Proto alkaloids
Alkylamines (amino alkaloids) – Ephedrine, colchinine