Chalcone Mannich base derivatives: synthesis, antimalarial activities against , and molecular docking analysis

• Published in: RSC advances 2023-12, Vol.13 (51), p.3635-3647
• Main Authors: Syahri, Jufrizal, Hilma, Rahmiwati, Ali, Amatul Hamizah, Ismail, Norzila, Yee Ling, Ng, Nurlaili, Nurohmah, Beta Achromi, Agustar, Hani Kartini, Ling, Lau Yee, Latip, Jalifah
• Format: Article
• ISSN: 2046-2069
• DOI: 10.1039/d3ra05361j

Development and discovery of new antimalarial drugs are needed to overcome the multi-resistance of Plasmodium parasites to commercially available drugs. Modifying the substitutions on the amine groups has been shown to increase antimalarial activities and decrease cross-resistance with chloroquine. In this study, we have synthesized several chalcone derivatives via the substitution of aminoalkyl groups into the aromatic chalcone ring using the Mannich-type reaction. The chalcone derivatives were evaluated for their antimalarial properties against Plasmodium knowlesi A1H1 and P. falciparum 3D7, as well as their molecular docking on Plasmodium falciparum dihydrofolate reductases-thymidylate synthase (PfDHFR-TS). Data from in vitro evaluation showed that chalcone Mannich-type base derivatives 2a , 2e , and 2h displayed potential antimalarial activities against P. knowlesi with EC 50 of 2.64, 2.98, and 0.10 μM, respectively, and P. falciparum 3D7 with EC 50 of 0.08, 2.69, and 0.15 μM, respectively. The synthesized compounds 2a , 2e , and 2h exerted high selectivity index (SI > 10) values on the A1H1 and 3D7 strains. The molecular docking analysis on PfDHFR-TS supported the in vitro assay of 2a , 2e , and 2h by displaying CDOCKER energy of −48.224, −43.292, and −45.851 kcal mol −1 . Therefore, the evidence obtained here supports that PfDHFR-TS is a putative molecular target for the synthesized compound. Research on the antimalarial effect of aminoalkyl chalcone derivatives against Plasmodium falciparum and Plasmodium knowlesi has bolstered efforts in drug discovery to combat cases of drug resistance.