反应详情

4-Bromobenzenesulfonyl chloride (3.19 g, 12.5 mmol) was added to a solution of 4-amino-2-chloropyridine (642 mg, 5 mmol) in pyridine (5 ml) and dichloromethane (5 ml). The reaction mixture was stirred at room temperature for 2 h. The solvent was evaporated and the residue suspended in 2M NaOH (25 ml) and heated at 60° C. for 1 h. The reaction mixture was extracted with ethyl acetate (2×25 ml). The extracts were washed, dried and evaporated. The residue was suspended in methanol and filtered. Evaporation of the filtrate and trituration with diethyl ether afforded the title compound (D3), 1H NMR (DMSO) δ: 6.54 (1H, d), 6.62 (1H, s), 7.60-7.63 (4H, m), 7.66 (1H, d).

1. customThe solvent was evaporated
2. temperatureheated at 60° C. for 1 h
3. extractionThe reaction mixture was extracted with ethyl acetate (2×25 ml)
4. washThe extracts were washed
5. customdried
6. customevaporated
7. filtrationfiltered
8. customEvaporation of the filtrate and trituration with diethyl ether