Synthesis of novel 4-aminoquinolineerhodanine hybrid using inexpensive starting materials via easy to
operate methodology, and their biological activity is reported. All the compounds were screened for their
in vitro antimalarial activity against chloroquine-resistant (K1) and chloroquine-sensitive (3D7) strains of
Plasmodium falciparum, and their cytotoxicity toward VERO cell line. Compounds 9, 19, 21 and 23
exhibited excellent antimalarial activity with IC50 value ranging from 13.2 to 45.5 nM against
chloroquine-resistant (K1) strain. Biochemical studies revealed that inhibition of hemozoin formation is
the primary mechanism of action of these analogs for their antimalarial activity. Additionally, some
derivatives (14, 18 and 26) of this series also exhibited the antimycobacterial activity against H37Rv strain
of Mycobacterium tuberculosis with MIC value of 6.25 mM.