Table 10.1 Ring structure present in alkaloidal drugs
Heterocyclic
ring
Alkaloidal drugs
Ring structure
True alkaloidal drugs (Heterocyclic alkaloids)
Indole
Reserpine, Ergotamine, Ergometrine, Physostigmine,
Strychnine, Vincristine, Vinblastine
N
H
Imidazole
Pilosine, Pilocarpine,
N
H
N
Isoquinoline
Morphine codeine, Papaverine, Narcotine,
d-tubocurarine, Emetine, Cephaeline
N
Norlupinane
Lupanine, Sparteine
N
Pyrrole and
pyrrolidine
Cocoa, Hygrine
N
H
N
H
Pyridine and
piperidine
Arecoline, Conine, Lobeline
N
N
H
Pyrrolizidine
Senecionine, Symphitine
N
Quinoline
Quinine, Quinidine, Cinchonine, Camptothecin
N
Steroidal
Conessine, Funtumine, Solanidine, Protoveratrine,
Withanine
Tropane
Atropine, Hyoscine, Cocaine, Meteloidine
N
C
H 3
Proto alkaloidal drugs (non-heterocyclic alkaloids)
Alkylamine
(Amino
alkaloid)
Ephedrine, Colchicine, Pseudoephedrine, Aconite
R-NH 2
Pseudo alkaloidal drugs
Diterpenes
Aconitine, Aconine
C 10 H 16
Purine
Caffeine, theophylline, theobromine
N
H
NH
N
H
N
H
O
O
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C. C. Kandar