4-Toluenesulfonyl chloride → HCID 59815649, compound

Participants

Reaction Steps

5-Bromo-3-nitropyridin-2-ol (30.00 g, 0.137 mmol) and p-toluenesulfonyl chloride (30.03 g, 0.158 mmol) were suspended in CH2Cl2 under N2 and treated dropwise with triethylamine (38.2 mL, 0.274 mmol) prior to the addition of DMAP (3.35 g, 0.027 mmol). After stirring at rt for 16 h the mixture was diluted with CH2Cl2 (500 mL) then washed with 1M HCl(aq) (2×500 mL) and brine (500 mL). The aqueous layer was back-extracted with CH2Cl2 (200 mL) and the combined organic layers dried over Na2SO4, and concentrated in vacuo. The crude material thus isolated was chromatographed over silica gel eluting with 50% EtOAc/hexane to give, on evaporation, a solid which was crystallized from 50% EtOAc/hexane to afford 5-bromo-3-nitropyridin-2-yl 4-methylbenzenesulfonate. 1H NMR (400 MHz, CDCl3) δ 2.51 (s, 3H), 7.43 (dd, 2H, J=8.4, 0.4 Hz), 7.99 (dt, 2H, J=6.8, 2.0 Hz), 8.52 (d, 1H, J=2.4 Hz), 8.60 (d, 1H, J=2.4 Hz).

Provenance & Evidence