Cl[S:2]([C:5]1[CH:6]=[C:7]([CH:11]=[CH:12][CH:13]=1)[C:8]([OH:10])=[O:9])(=[O:4])=[O:3].[CH3:14][N:15]1[CH2:20][CH2:19][NH:18][CH2:17][CH2:16]1.C(=O)([O-])[O-].[K+].[K+]>C1COCC1>[CH3:14][N:15]1[CH2:20][CH2:19][N:18]([S:2]([C:5]2[CH:6]=[C:7]([CH:11]=[CH:12][CH:13]=2)[C:8]([OH:10])=[O:9])(=[O:4])=[O:3])[CH2:17][CH2:16]13-(chlorosulfonyl)benzoic acid (200 mg, 0.906 mmol) was added to the 1-methylpiperazine (100 mg, 0.997 mmol) in presence of potassium carbonate (251 mg, 1.813 mmol) in THF (Volume: 5 ml) at room temperature and the reaction mixture was stirred for 12 h at room temperature. Reaction was monitored by TLC. After completion of the reaction, the solvent was removed by vacuum and then compound was purified by column chromatography (3% CH3OH/CH2Cl2) afforded the product 3-((4-methylpiperazin-1-yl)sulfonyl)benzoic acid (100 mg, 0.320 mmol, 35.3% yield) as a solid. 1H NMR (CDCl3, 400 MHz): δ 7.77 (m, 2H), 7.63-7.55 (m, 2H), 3.04 (m, 4H), 2.46 (m 4H), 2.31 (s, 3H). Mass [M+H]+:285.1
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