反应详情

A solution of 2-amino-5-chlorobenzoic acid (10 g, 0.06 mol), anhydrous DMF (30 mL) and dioxane (30 mL) was cooled to 0° C. in a 250 mL 3-necked flask, fitted with a magnetic stirrer, thermometer and additional funnel. Bromoacetyl bromide (11.8 g, 5 mL, 100 mol %) was added dropwise over a 20 min period, keeping the internal temperature between 0° C to 1° C. After the addition was completed, the solution was allowed to warm to room temperature and stirring was continued overnight at rt. The reaction mixture was cooled in an ice-bath, stirred for 30 min and diluted with water (80 mL). The resulting light yellow precipitate was filtered, washed with water, and dried in vacuum oven (20 h, 40-45° C.), to afford 11.4 g (67%) of the title compound, mp 210-212° C. (decomp.); 1H NMR (CD3OD) δ 8.58 (d, 1H, J=9.2), 8.03 (d, 1H, J=2.8), 7.55 (dd, 1H, J=2.4, J=6.4), 4.11 (s, 2H); 13C NMR (CD3OD) δ 196.94, 169.69, 140.49, 134.86, 131.94, 129.49, 122.87, 119.47, 30.04; MS (EI, m/z) 293 (M+)

1. customfitted with a magnetic stirrer
2. custombetween 0° C to 1° C
3. additionAfter the addition
4. temperatureThe reaction mixture was cooled in an ice-bath
5. stirringstirred for 30 min
6. filtrationThe resulting light yellow precipitate was filtered
7. washwashed with water
8. customdried in vacuum oven (20 h, 40-45° C.)