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Current Organic Chemistry

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ISSN (Print): 1385-2728
ISSN (Online): 1875-5348

Research Article

Hemisynthesis of Pentacyclic Triterpenoids from Diospyros foxworthyi with In vitro and In silico Anti-malarial Evaluation

Author(s): Muhammad Solehin Abd Ghani, Nur Ain Latifhaa Abu Bakar, Arba Pramundita Ramadani, Arde Toga Nugraha, Khalijah Binti Awang, Mohammad Tasyriq Che Omar, Unang Supratman, Ezatul Ezleen Kamarulzaman and Mohamad Nurul Azmi Mohamad Taib*

Volume 28, Issue 10, 2024

Published on: 16 April, 2024

Page: [799 - 814] Pages: 16

DOI: 10.2174/0113852728294047240315063815

Price: $65

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Abstract

A total of twelve pentacyclic triterpenoid derivatives based on betulin (1) and lupeol (2) scaffolds isolated from Diospyros foxworthyi were hemisynthesized by acylation or acetylation reactions with appropriate acid chloride or acetic anhydride. The structures of the hemisynthesised compounds were characterised by means of FT-IR, 1D- and 2D-NMR, as well as HRMS analysis. These compounds were assayed for in vitro anti-malarial studies by inhibition of β-hematin formation assay with chloroquine as a positive control. Compounds 1d and 2f showed the strongest potential as β-hematin formation inhibitors with IC50 values of 6.66 ± 1.36 and 11.89 ± 0.15 μM, respectively, compared with the positive control (chloroquine; IC50 = 37.50 ± 0.60 μM). In silico molecular docking simulations were performed using AutoDock Vina for compounds 1d and 2f to investigate the binding interactions and free energy of binding (FEB) with the hemozoin supercell crystal structure (CCDC number: XETXUP01). The findings revealed several hydrophobic interaction modes between the 1d, 2f and hemozoin, with calculated FEBs of -8.4 ± 0.2 and -8.9 ± 0.0 kcal mol-1, indicating strong and favourable interactions.

Keywords: Pentacyclic triterpenoids, hemisynthesis, anti-malaria, β-hematin inhibition activity, molecular docking, Diospyros foxworthyi.

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