反应详情

温度

0 °C

To a solution of methyl 2-[(5-aminopyridin-2-yl)oxy]-5-chlorobenzoate (step 2 of Example 101, 1.00 g, 3.6 mmol) in 0.66 M hydrochloric acid (11 mL) was added sodium nitrite (252 mg, 3.6 mmol) in water (5 mL) at 0° C. The reaction mixture was stirred for 30 mim at 0° C. The mixture was added dropwise to a stirred suspension of cupper(II) chloride (1.21 g, 9.0 mmol) in acetone (18 mL) and water (5.4 mL). The whole was stirred at 50° C. for 30 min. Then the reaction mixture was poured into water and it was added ammonia solution. The aqueous mixture was extracted with ethyl acetate. The organic phase was washed with brine, dried over sodium sulfate, and concentrated. The residue was purified by flush column chromatography on silica gel eluting with hexane/ethyl acetate (20/1) to afford 347 mg (32%) of the title compound: 1H-NMR (CDCl3) δ 8.00 (1H, d, J=2.8 Hz), 7.99 (1H, d, J=2.8 Hz), 7.67 (1H, dd, J=8.7, 2.8 Hz), 7.55 (1H, dd, J=8.6, 2.8 Hz), 7.14 (1H, d, J=8.6 Hz), 6.97 (1H, d, J=8.7 Hz), 3.72 (3H, s).

1. stirringThe whole was stirred at 50° C. for 30 min
2. extractionThe aqueous mixture was extracted with ethyl acetate
3. washThe organic phase was washed with brine
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated
6. customThe residue was purified
7. customby flush column chromatography on silica gel eluting with hexane/ethyl acetate (20/1)