Morpholine → 3-(Morpholine-4-sulfonyl)benzoic acid

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Commercially available 3-(chlorosulfonyl)benzoic acid (3 g, 13.5 mmol) was suspended in dichloromethane (50 mL). Diisopropylethylamine (5.19 mL, 30 mmol) and morpholine (1.67 mL, 21 mmol) were added slowly. After 2 h, the solvent was removed under reduced pressure. The residue was dissolved in ethyl acetate and washed with 3N HCl three times. The ethyl acetate phase was dried over magnesium sulfate and the solvent was removed under reduced pressure, to provide the title product (2.97 g, 81%) as a white solid. 1HNMR (DMSO-d6) δ8.28 (d, J=8 Hz, 1H), 8.20 (s, 1H), 8.01 (d, 8 Hz, 1H), 7.83 (t, J=8 Hz, 1H), 3.91(m, 4H), 3.12 (M, 4H). MS (EI-NEG):[M+] 270.

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