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Published on:June 2018
Indian Journal of Pharmaceutical Education and Research, 2018; 52(3):472-479
Original Article | doi:10.5530/ijper.52.3.55

Synthesis and Antimalarial Activity of Lawsone Mannich Base Derivatives


Authors and affiliation (s):

Medhi Arundhati, Chetia Dipak, Rudrapal Mithun*

Department of Pharmaceutical Sciences, Dibrugarh University, Dibrugarh, INDIA.

Abstract:

Introduction: The emergence of multi-drug resistant strains of Plasmodium falciparum has increasingly become a serious health problem worldwide. To address this challenging issue, there is an urgent need to discover and develop novel and potent antimalarial agents. Materials and Methods: A new series of lawsone Mannich base derivatives were synthesized, characterized (IR, NMR and Mass) and evaluated for in vitro for antimalarial activity against chloroquine (CQ)-sensitive and CQ-resistant strains of P. falciparum. Results and Discussion: Among synthesized compounds, five compounds showed good antimalarial activity against both chloroquine (CQ)-sensitive (3D-7) and -resistant (RKL- 2) strains of P. falciparum, which, however, was considerably less than that of the standard reference drug, CQ. The antimalarial activity of these five compounds was found better against sensitive (IC50 = 0.411-0.502 μg/ml) strain than the resistant (IC50 = 1.391-2.394 μg/ml) one. The IC50 values for CQ were 0.044 μg/ml and 0.216 μg/ml against sensitive and resistant strains of P. falciparum, respectively. SAR study suggests that antimalarial potential of lawsone structural scaffold can be modulated by different substitution pattern like Mannich base substitution (alkyl/aryl/heteroaryl substituted aminoalkyl moiety) at the C-3 position of 1,4-naphthoquinone ring system. Conclusion: Owing to their antimalarial effectiveness, lawsone derived aminonaphthoquinones can be used as lead structure(s) in the development of yet more potent antimalarial agents.

Key words: Lawsone, Mannich bases, Aminonaphthoquinone, Plasmodium falciparum, Resistant malaria.

 

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The Official Journal of Association of Pharmaceutical Teachers of India (APTI)
(Registered under Registration of Societies Act XXI of 1860 No. 122 of 1966-1967, Lucknow)

Indian Journal of Pharmaceutical Education and Research (IJPER) [ISSN-0019-5464] is the official journal of Association of Pharmaceutical Teachers of India (APTI) and is being published since 1967.

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