反应详情

温度

0 °C

A solution of 2-amino-5-chlorobenzoic acid (10 g, 0.06 mol) in the mixture of anhydrous DMF (30 mL) and dioxane (30 mL) was cooled to 0° C. in a 250 mL 3-necked flask which was fitted with a magnetic stirrer, thermometer and an 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 ice-bath was removed, and then stirring was continued overnight at rt. The reaction mixture was cooled in an ice-bath and stirred for 30 min, water (80 mL) was added, and then the light yellow precipitate which formed was filtered, washed with water, and then dried in a vacuum oven (20 h, 40°-45° C.) affording 11.4 g (67%) of the title compound: mp 210°-212° C. (dec.), 1H NMR (CD3OD) δ8.58 (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) δ196.94, 169.69, 140.49, 134.86, 131.94, 129.49, 122.87, 119.47, 30.04; MS (EI, m/z) 293 (M+).

1. customwas fitted with a magnetic stirrer
2. custombetween 0° C. to 1° C
3. additionAfter the addition
4. customthe ice-bath was removed
5. temperatureThe reaction mixture was cooled in an ice-bath
6. stirringstirred for 30 min
7. additionwater (80 mL) was added
8. customthe light yellow precipitate which formed
9. filtrationwas filtered
10. washwashed with water
11. customdried in a vacuum oven (20 h, 40°-45° C.)