C([S:4][CH2:5][CH2:6][C:7]1[CH:12]=[CH:11][C:10]([C:13]([O:15]C)=[O:14])=[CH:9][C:8]=1[C:17]([O:19]C)=[O:18])(=O)C.[OH-].[Na+]>C1COCC1.O>[SH:4][CH2:5][CH2:6][C:7]1[CH:12]=[CH:11][C:10]([C:13]([OH:15])=[O:14])=[CH:9][C:8]=1[C:17]([OH:19])=[O:18]To a degassed solution of dimethyl 4-[2-(acetylthio) ethyl]-1,3-benzenedicarboxylate (0.130 g, 0.44 mmol) in THF (5 mL) was added a degassed solution of 5 N NaOH (5 mL). The reaction mixture was stirred under nitrogen overnight. The reaction mixture was diluted with H2O (10 mL) and extracted with EtOAC (10 mL). The organic layer was dried over MgSO4 and concentrated to give 0.045 g of white solid (45% yield): 1H NMR (DMSO) δ 2.67 (t, 2H) 3.21 (t, 2H), 7.37 (d, 1H), 7.98 (d, 1H), 8.46 (s, 1H). 13C NMR (DMSO) δ 26.64, 40.60, 130.87, 132.05, 133.46, 133.81, 134.13, 148.53, 169.22, 170.20. Elemental analysis calculated for C10H10SO4: C, 53.09; H, 4.45; S, 14.47. Found: C, 53.37; H, 4.87; S, 12.84. MS(FAB): 225.
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