Journal
BIOORGANIC CHEMISTRY
Volume 84, Issue -, Pages 98-105Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bioorg.2018.11.037
Keywords
Molecular hybridization; Leishmaniasis; Leishmania infantum; Leishmania donovani; Promastigotes; Amastigotes
Funding
- Council of Scientific and Industrial Research, New Delhi, India
- TKS's Welcome Trust [093228]
- European Community [602773]
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A series of piperazinyl-beta-carboline-3-carboxamide derivatives were designed through a molecular hybridization approach. Designed analogues were synthesized, characterized and evaluated for anti-leishmanial activity against Leishmania infantum and Leishmania donovani. In L. infantum inhibition assay, compounds 7d, 7g and 7c displayed potent inhibition of promastigotes (EC50 1.59, 1.47 and 3.73 mu M respectively) and amastigotes (EC50 1.4, 1.9 and 2.6 mu M respectively). SAR studies revealed that, para substitution of methoxy, chloro groups and methyl group on ortho position favored anti-leishmanial activity against L. infantum. Among these analogues 7d, 7h, 7n and 7g exhibited potent inhibition against L. donovani promastigotes (EC50 0.91, 4.0, 4.57 and 5.02 mu M respectively), axenic amastigotes (EC50 0.9, 3.5, 2.2 and 3.8 mu M respectively) and intracellular amastigotes (EC50 1.3, 7.8, 5.6 and 6.3 mu M respectively). SAR studies suggested that, para substitution of methoxy group, para and meta substitution of chloro groups and benzyl replacement recommended for significant anti-leishmanial against L. donovani.
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