反应详情

At 0° C., to a stirred ice-water suspension (˜200 mL) of 2-chloro-5-(chlorosulfonyl)-4-fluorobenzoic acid was slowly added a precooled 40% methylamine (13 mL). The reaction mixture was then stirred for 2 hours before being acidified to pH˜2. The desired product was precipitated and filtered out. After being dried overnight, the pure 2-chloro-4-fluoro-5-[(methylamino)sulfonyl]benzoic acid was obtained as white solid (9.8 g, 100%).

1. customThe desired product was precipitated
2. filtrationfiltered out
3. customAfter being dried overnight