[CH3:1][O:2][C:3](=[O:18])[C:4]1[CH:9]=[C:8]([O:10][CH3:11])[CH:7]=[C:6]([S:12]C(=O)N(C)C)[CH:5]=1.CO[Na].Cl>C1COCC1>[CH3:1][O:2][C:3](=[O:18])[C:4]1[CH:9]=[C:8]([O:10][CH3:11])[CH:7]=[C:6]([SH:12])[CH:5]=1To a stirred solution of 3-dimethylcarbamylthio-5-methoxybenzoic acid methyl ester (500 mg, 1.86 mmol) in THF (10 mL) at room temperature was added MeONa (0.5 M in MeOH, 10.0 mL, 5.0 mmol, 2.69 eq.). The reaction was refluxed for 2 h, then cooled to room temperature and added to 1.0 N HCl aqueous solution (150 mL). The resulting mixture was extracted with EtOAc/hexanes (1:1, 150 mL). The organic layer was washed with brine (100 mL), dried over MgSO4 and concentrated in vacuo to give 3-mercapto-5-methoxybenzoic acid methyl ester (0.365 g). The product was used without further purification.
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