反应详情

温度

0 °C

3-Phenoxypyridin-2-amine (20.50 g, 110.1 mmol) was placed in acetic acid (50 mL) and cooled to 0° C. Bromine (d 3.12) (7.049 mL, 137.6 mmol) was slowly added and the reaction mixture was stirred for 1 hour. The reaction mixture was poured onto saturated sodium bisulfite and ice and allowed to sit overnight. Solids were removed by filtration and washed with water to give pure 5-bromo-3-phenoxypyridin-2-amine. The filtrate was then extracted with CH2Cl2 several times, combined, and washed with water. Organic layer was dried, filtered, and concentrated. The residue was purified by silica gel (5-20% EtOAc in hexanes) to give additional 5-bromo-3-phenoxypyridin-2-amine (total yield: 22.69 g, 77.74% yield).

1. waitto sit overnight
2. customSolids were removed by filtration
3. washwashed with water