4-Aminoquinoline-ferrocene Hybrids as Potential Antimalarials

Area of Science:

• Medicinal Chemistry
• Parasitology
• Drug Discovery

Background:

• Malaria remains a significant global health threat, primarily treated with 4-aminoquinoline derivatives like chloroquine.
• Combination therapies and hybrid molecules incorporating 4-aminoquinolines are explored for enhanced efficacy.
• Ferrocene-containing 4-aminoquinoline hybrids have shown promise in previous studies.

Purpose of the Study:

• To synthesize novel 4-aminoquinoline-ferrocene hybrids using esterification and amidation.
• To characterize the synthesized compounds using spectroscopic techniques (FTIR, LC-MS, NMR).
• To evaluate the in vitro antimalarial activity of these hybrids against chloroquine-sensitive Plasmodium falciparum.

Main Methods:

• Synthesis of hybrid compounds via established chemical reactions.
• Purification using column chromatography and characterization by FTIR, NMR, and MS.
• In vitro antiplasmodial assays against asexual Plasmodium falciparum, with chloroquine as a reference.

Main Results:

• Hybrid compounds exhibited high percentage inhibition (97.9-102% at 5 μM; 36-96% at 1 μM).
• The IC50 values ranged from 0.7-1.6 μM, showing significant activity compared to the parent drug.
• Activity was observed against chloroquine-sensitive Plasmodium falciparum (NF54 strain).

Conclusions:

• The synthesized 4-aminoquinoline-ferrocene hybrids possess significant antimalarial properties.
• While effective, they were less potent than chloroquine against the tested drug-sensitive strain.
• 4-aminoquinoline and ferrocene scaffolds are promising for the development of new antimalarial agents.