[Br:1][C:2]1[CH:7]=[CH:6][C:5]([S:8](Cl)(=[O:10])=[O:9])=[CH:4][CH:3]=1.[N:12]1[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=1[CH2:18][CH2:19][NH2:20].C(N(CC)CC)C.C(=O)(O)[O-].[Na+]>ClCCl>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([S:8]([NH:20][CH2:19][CH2:18][C:13]2[CH:14]=[CH:15][CH:16]=[CH:17][N:12]=2)(=[O:10])=[O:9])=[CH:4][CH:3]=1Add a solution of 4-bromo-benzenesulfonyl chloride (1.278 g, 5.0 mmol) in 10 mL dichloromethane at r.t. to a solution of 2-pyridin-2-yl-ethylamine (611 mg, 5.0 mmol) and triethylamine (708 μL, 5.0 mmol) in 5 mL dichloromethane over a period of 20 min via syringe pump and stir for 12 h. Add 20 mL saturated aqueous sodium bicarbonate solution and extract the aqueous phase with dichloromethane. Wash the combined organic extracts with brine, dry over sodium sulfate, filtrate and concentrate under reduced pressure to obtain 4-bromo-N-(2-pyridin-2-yl-ethyl)-benzenesulfonamide (1.67 g) as a pale yellow oil which slowly crystallizes upon storage at ambient temperature. Further purification is not necessary. MS (m/e): 342 (M+H).
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