Structure-Activity Relationship of Novel Pyrimidine Derivatives with Potent Inhibitory Activities against .

Discovery of novel antitubercular drugs is an effective strategy against drug-resistant tuberculosis (TB). Our previous study has identified as a novel antitubercular compound. Herein, we perform a comprehensive structure-activity relationship (SAR) based on , indicating that the central pyrimidine ring moiety was crucial for the antitubercular activities of its derivatives, and replacing the naphthyl group with hydrophobic substitutes was well tolerated. The representative derivative exhibited potent activity against H37Ra, H37Rv, and clinical drug-resistant TB with minimum inhibitory concentration (MIC) values of 0.5-1.0 μg/mL. Meanwhile, showed an acceptable safety and displayed a favorable oral bioavailability with a value of 40.7%. The differential scanning fluorescence, isothermal titration calorimetry, and molecular docking assays indicated that PknB could be one of the targets of compound . Overall, this study identified as a novel promising lead compound with the potential to develop candidates for the treatment of drug-resistant TB.