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0 °C

4-(Chlorosulfonyl)benzoic acid (5.0 g, 22.7 mmol) was added in three portions over a 10 minute period to a stirring solution of furfuryl amine (6.6 g, 68 mmol) in acetone (200 mL) cooled to 0° C. via an ice water bath. After addition of the sulfonyl chloride was complete the ice bath was removed and the solution was stirred for 1 hour at ambient temperature. The mixture was concentrated and subjected to silica gel chromatography (90% ethyl acetate, 8% hexanes and 2% acetic acid) to afford 4.4 of 4-(N-(furan-2-ylmethyl)sulfamoyl)benzoic acid (4.4 g, 68%) as a white solid. 1H NMR (DMSO-d6, 400 MHz): 4.04 (d, 2H, J=6 Hz), 6.13 (d, 1H, J=3.2 Hz), 6.25 (m, 1H), 7.43 (m, 1H), 7.83 (d, 2H, J=8.4 Hz), 8.05 (d, 2H, J=8.4 Hz), 8.36 (t, 1H, J=6 Hz), 13.4 (bs, 1H).

1. customwas removed
2. concentrationThe mixture was concentrated