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Updated: Jan 15, 2026

Facile Preparation of 4-Substituted Quinazoline Derivatives
Published on: February 15, 2016
Quinazolinones as Bioisosteres of Naphthoquinones: A Path to Potent HsDHODH Inhibitors with Optimized Properties
Bruna F Godoi1,2, Jéssica D Bueno1,2, Wemenes J L Silva1,3,4
1Center for the Research and Advancement in Fragments and Molecular Targets (CRAFT), School of Pharmaceutical Sciences at Ribeirao Preto, University of São Paulo, Ribeirão Preto 14040-903, SP, Brazil.
Abstract:
Human dihydroorotate dehydrogenase (HsDHODH) is a key enzyme in pyrimidine biosynthesis and a target for antiviral therapies against RNA viruses like SARS-CoV-2. Building on prior quinone-based inhibitors, we explored quinazol-inones as bioisosteric replacements to reduce cytotoxicity and off-target effects. Through structure-based design, we synthesized quinazol-inone derivatives aimed at maintaining critical binding interactions. First-generation compounds showed moderate HsDHODH inhibition (up to 60% at 250 μM), with compound 10c having an IC50 of 25 μM. Using computational modeling, we optimized second-generation derivatives, with 10e showing the highest potency (IC50 = 0.59 ± 0.03 μM) and significant antiviral activity against SARS-CoV-2 (EC50 = 0.15 ± 0.03 μM). These compounds demonstrated improved selectivity compared to naphtho-quinone analogs, though challenges with aqueous solubility remain. These results highlight quinazol-inones as promising scaffolds for further development of anti-SARS-CoV-2 therapies targeting HsDHODH.
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