Synthesis of Novel 1,2,3-Triazole Derivatives of Isocoumarins and 3,4-Dihydroisocoumarin with Potential Antiplasmodial Activity In Vitro

Author(s): Lucas da Silva Santos, Matheus Fillipe Langanke de Carvalho, Ana Claudia de Souza Pinto, Amanda Luisa da Fonseca, Julio César Dias Lopes, Fernando de Pilla Varotti, Rossimiriam Pereira de Freitas, Rosemeire Brondi Alves*

Journal Name: Medicinal Chemistry

Volume 17 , Issue 8 , 2021

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Graphical Abstract:


Background: Malaria greatly affects the world health, having caused more than 228 million cases only in 2018. The emergence of drug resistance is one of the main problems in its treatment, demonstrating the need for the development of new antimalarial drugs.

Objective: Synthesis and in vitro antiplasmodial evaluation of triazole compounds derived from isocoumarins and a 3,4-dihydroisocoumarin.

Methods: The compounds were synthesized in 4 to 6-step reactions with the formation of the triazole ring via the Copper(I)-catalyzed 1,3-dipolar cycloaddition between isocoumarin or 3,4- dihydroisocoumarin azides and terminal alkynes. This key reaction provided compounds with an unprecedented connection of isocoumarin or 3,4-dihydroisocoumarin and the 1,2,3-triazole ring. The products were tested for their antiplasmodial activity against a Plasmodium falciparum chloroquine resistant and sensitive strains (W2 and 3D7, respectively).

Results: Thirty-one substances were efficiently obtained by the proposed routes with an overall yield of 25-53%. The active substances in the antiplasmodial test displayed IC50 values ranging from 0.68-2.89 μM and 0.85-2.07 μM against W2 and 3D7 strains, respectively.

Conclusion: This study demonstrated the great potential of isocoumarin or 3,4-dihydroisocoumarin derivatives because practically all the tested substances were active against Plasmodium falciparum.

Keywords: Isocoumarin, 3, 4-dihydroisocoumarin, 1, 2, 3-triazole, antiplasmodial activity, malaria, Plasmodium falciparum.

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Article Details

Year: 2021
Published on: 02 June, 2020
Page: [820 - 833]
Pages: 14
DOI: 10.2174/1573406416666200602161047
Price: $65

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