反应详情

温度

80 °C

A mixture of 1-[6-(4-bromo-phenoxy)-pyridin-3-yl]-pyrrolidine-2,2-dicarboxylic acid diethyl ester (0.28 g, 0.53 mmol), zinc cyanide (0.037 g, 0.32 mmol), tetrakistriphenylphosphine palladium (0) (0.024 g, 0.021 mmol) and 0.66 mL of dimethylformamide was heated to 80° C. for 24 hours. An additional 37 mg of zinc cyanide and 24 mg of tetrakistriphenylphosphine palladium (0) was added and the mixture was stirred at 80° C. for an additional 48 hours. After cooling to room temperature, the mixture was diluted with toluene and was washed with 2M ammonium hydroxide (twice), brine, dried over sodium sulphate, filtered and concentrated in vacuo. Purification by radial chromatography (ethyl acetate-hexanes, then methanol) afforded 58 mg of 1-[6-(4-Cyano-phenoxy)-pyridin-3-yl]-pyrrolidine-2,2-dicarboxylic acid diethyl ester as a colorless syrup. 1H NMR (CDCl3, 500 MHz): 8.07 (d, 1H, J=3.5 Hz), 7.80 (dd, 1H, J=2.5, 9.0 Hz), 7.69 (d, 2H, J=9.0 Hz), 7.25 (d, 2H, J=9.0 Hz), 7.02 (d, 1H, J=9.0 Hz), 4.21 (q, 4H, J=7.5 Hz), 2.74 (m, 2H), 2.66 (m, 2H), 1.19 (t, 6H, J=7.0 Hz) ppm. MS (APCl, m/z): 424 [M+H]+.

1. temperatureAfter cooling to room temperature
2. washwas washed with 2M ammonium hydroxide (twice), brine
3. dry with materialdried over sodium sulphate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customPurification by radial chromatography (ethyl acetate-hexanes