Cyclopropylamine → 4-(Cyclopropylsulfamoyl)benzoic acid

Participants

Reaction Steps

To 4-chlorosulfonylbenzoic acid (10.0 g, 45.3 mmol) in dichloromethane (350 mL) at 0° C. was added cyclopropanamine (15.5 g, 19 mL, 271.9 mmol). The reaction mixture was allowed to warm to room temperature over 16 hours. The solvent was evaporated under reduced pressure. The residue was dissolved in water (150 mL) and acidified using hydrochloric acid. The aqueous layer was extracted with EtOAc (2×200 mL). The organic layer was dried over sodium sulfate, filtered and concentrated in vacuo to give 4-(cyclopropylsulfamoyl)benzoic acid (10.0 g, 92%) as a white solid. ESI-MS m/z calc. 241.0. found 242.5 (M+1)+; Retention time: 0.84 minutes (3 min run); 1H NMR (400 MHz, DMSO) δ 13.27 (s, 1H), 7.97 (d, J=8.3 Hz, 2H), 7.91 (d, J=2.5 Hz, 1H), 7.75 (d, J=8.3 Hz, 2H), 2.03-1.90 (m, 1H), 0.38-0.28 (m, 2H), 0.23-0.15 (m, 2H).

Provenance & Evidence