反应详情

To a solution of 5-bromo2-nitropyridine (2.03 g, 10.0 mmol) in DMF (30 mL) was added Cs2CO3 (4.9 g, 15.0 mmol) followed by 4-acetylaminophenol (1.66 g, 11.0 mmol) in DMF (30 mL) at 0° C. then stirred at room temperature overnight. The mixture was extracted with ethyl acetate. The organic layer was washed with water and brine, dried over. Na2SO4 then evaporated. Sequence purification on SiO2 column chromatography and recrystalization from ethyl acetate gave 5-(4-acetamidophenoxy)-2-nitropyridine (1.62 g, 59%). Hydrogenation of 5-(4-acetamidophenoxy)-2-nitropyridine (879.0 mg, 3.22 mmol) with 5% Pd—C in MeOH (80 mL) gave the title compound (575.7 mg, 74%): MS m/e 244 (M+1).

1. extractionThe mixture was extracted with ethyl acetate
2. washThe organic layer was washed with water and brine
3. customdried over
4. customNa2SO4 then evaporated
5. customSequence purification
6. customon SiO2 column chromatography and recrystalization from ethyl acetate