反应详情

温度

60 °C

A mixture of 5-bromo-3-iodo-1-(2-methoxy-ethoxymethyl)-1H-pyrazolo[3,4-b]pyridine (180 mg, 0.44 mmol), 1,1′-bis(diphenylphosphino)ferrocenepalladium(II)-dichloride dichlormethane adduct (18 mg, 25 μmol) and 2-methoxyphenylboronic acid (82 mg, 0.51 mmol) in acetonitrile (3 mL) and 2 M aqueous solution of sodium carbonate (3 ml) in a sealed vial was stirred at 60° C. for 2 h. The crude mixture was distributed between ethyl acetate and brine. The aqueous phase was extracted with ethyl acetate (3×) and the combined organic phases were dried over sodium sulfate, filtered and concentrated. The crude was then purified by flash silica gel chromatography using a gradient of ethyl acetate in hexanes to afford 5-bromo-1-(2-methoxy-ethoxymethyl)-3-(2-methoxy-phenyl)-1H-pyrazolo[3,4-b]pyridine (80 mg, 0.2 mmol, 46% yield) as a yellow oil. 1H-NMR (500 MHz, d6-DMSO) δ 8.70 (d, 1H), 8.40 (d, 1H), 7.62 (dd, 1H), 7.49 (ddd, 1H), 7.22 (d, 1H), 7.09 (dt, 1H), 5.85 (s, 2H), 3.85 (s, 3H), 3.68-3.70 (m, 2H), 3.39-3.41 (m, 2H), 3.18 (s, 3H). MS: m/z 316, 318 [MH+].

1. extractionThe aqueous phase was extracted with ethyl acetate (3×)
2. dry with materialthe combined organic phases were dried over sodium sulfate
3. filtrationfiltered
4. concentrationconcentrated
5. customThe crude was then purified by flash silica gel chromatography