1H-1,2,3-triazole tethered isatin-ferrocene conjugates: Synthesis and in vitro antimalarial evaluation
摘要:
1H-1,2,3-triazole tethered isatin-ferrocene conjugates were synthesized and evaluated for their anti-plasmodial activities against chloroquine-susceptible (3D7) and chloroquine-resistant (W2) strains of Plasmodium falciparum. The conjugates 5f and 5h with an optimum combination of electron-withdrawing halogen substituent at C-5 position of isatin ring and a propyl chain, introduced as linker, proved to be most potent and non-cytotoxic among the series with IC50 values of 3.76 and 4.58 mu M against 3D7 and W2 strains, respectively. (c) 2014 Elsevier Masson SAS. All rights reserved.
A Cu-mediated azide-alkyne cycloaddition protocol has been employed for the synthesis of 16 different triazoles to probe the antitubercular structure activity relationships within the isatin-ferrocene-triazole conjugate family. The antitubercular evaluation studies revealed a marked improvement in activity with the introduction of ferrocene nucleus among precursors N-alkylazido isatins with a prefernce for halogen (F, Cl) substituent at C-S position of isatin as well as propyl chain length as a spacer. The induction of a chalcone nucleus resulted in the enhanced antimycobacterial efficacy irrespective of the subtituent and alkyl chain length as evidenced by the isatin-ferrocenylchalcone hybrids. The described protocol is the first successful attempt of the amalgamation of ferrocene isatin nuclei tethered via a triazole linker.