Dimethylamine → 4-iodo-N,N-dimethylbenzenesulfonamide

Dimethylamine (100 mL of 2.0 M solution in tetrahydrofuran; 200 mmol) was added to a solution of 4-iodobenzenesulfonyl chloride (54.76 g; 181 mmol) in pyridine (300 mL) at 0° C. under N2, followed by the addition of 4-N,N-dimethylaminopyridine (15 mg). The reaction was allowed to warm to room temperature and was stirred under N2 for 48 hrs. The reaction solution was poured into 1.2 liter of water, and the precipitated product was collected by filtration and rinsed with water (300 mL×2). The solid was dissolved in ethyl acetate (500 mL) and washed with 5% aqueous hydrochloric acid (300 mL×3), water (300 mL×2) and brine (300 mL). The organic solution was dried over anhydrous sodium sulfate and concentrated to give 4-iodo-N,N-dimethyl-benzenesulfonamide (49.46 g; 88%) as a white solid, which was used in the next reaction without further purification. 1H NMR (300 MHz, CDCl3) δ 7.88 (d, 2H, J=8.5 Hz), 7.46 (d, 2H, J=8.5 Hz), 2.69 (s, 3H).

1. filtrationthe precipitated product was collected by filtration
2. washrinsed with water (300 mL×2)
3. dissolutionThe solid was dissolved in ethyl acetate (500 mL)
4. washwashed with 5% aqueous hydrochloric acid (300 mL×3), water (300 mL×2) and brine (300 mL)
5. dry with materialThe organic solution was dried over anhydrous sodium sulfate
6. concentrationconcentrated

ORD record

ord-37c771df27ff466fb4b7088e4af54a2b

Source dataset

uspto-grants-2013_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08551998B2