反应详情

温度

70 °C

2-Iodobenzenesulphonyl chloride (obtained as described in J Org Chem, 1977, 42, 3265) (12.1 g) was added to a solution of 2-amino-3-methoxy-5-methylpyrazine (5.6 g) in pyridine (100 ml) and the solution was heated at 70° C. for 8 hours. Volatile material was removed by evaporation and water (200 ml) was added to the residue. The mixture was extracted with ethyl acetate (2×200 ml) and the extracts were washed with 2M hydrochloric acid (200 ml) and water (200 ml). The extracts were dried (MgSO4) and the solvent was removed by evaporation. The residue was triturated with ether to give N-(3-methoxy-5-methyl-2-pyrazinyl)-2-iodobenzenesulphonamide (7.2 g), m.p. 136°-138° C.; 1H NMR (d6 -DMSO): 2.3 (s,3H), 3.9 (s,3H), 7.3 (dt,1H), 7.5-7.65 (m,2H), 8.05-8.15 (m,2H), 10.7-10.8 (br s, 1H).

1. customVolatile material was removed by evaporation and water (200 ml)
2. additionwas added to the residue
3. extractionThe mixture was extracted with ethyl acetate (2×200 ml)
4. washthe extracts were washed with 2M hydrochloric acid (200 ml) and water (200 ml)
5. dry with materialThe extracts were dried (MgSO4)
6. customthe solvent was removed by evaporation
7. customThe residue was triturated with ether