反应详情

To a mixture of 3-bromo-4-methoxy-5-nitrobenzonitrile (6.26 g, 24.35 mmol) in dimethoxyethane (61 ml) was added water (16 ml), isopropenyl boronic acid (6.28 g, 73.1 mmol), potassium carbonate (10.10 g, 73.1 mmol), and tetrakis(triphenylphosphine) palladium(0) (0.281 g, 0.244 mmol). The resulting mixture was heated to reflux and stirred at this temperature overnight under nitrogen. The reaction mixture was then concentrated, diluted with water, and extracted with ethyl acetate (3×). The combined organics were washed with brine, dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was purified by flash column chromatography using a Horizon Biotage, 65i Si column, eluting with 1 column volume of hexanes, followed by a linear gradient of ethyl acetate in hexanes from 0% to 100% over 10 column volumes to afford the title compound as a red oil.

1. temperatureThe resulting mixture was heated
2. temperatureto reflux
3. concentrationThe reaction mixture was then concentrated
4. additiondiluted with water
5. extractionextracted with ethyl acetate (3×)
6. washThe combined organics were washed with brine
7. dry with materialdried over sodium sulfate
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customThe residue was purified by flash column chromatography
11. washeluting with 1 column volume of hexanes