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Classification Of Alkaloids As Per Structure

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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

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