反应详情

To (2-amino-5-bromo-pyridin-3-yl)-[6-(2-methoxy-ethylamino)-pyridin-3-yl]-methanone, 3,4-dimethoxyphenylboronic acid (1.3 equiv.) and dichlorobis (triphenylphosphino)palladium (ii) (6 mol %) in a Smith process vial was added a 3:2:1 mixture of acetonitrile, water, and a 2 m solution of sodium carbonate in water to achieve an overall concentration of the starting material of 0.10 m. The reaction was run in a Personal Chemistry® microwave reactor at 165° C. for 1200 s. Water was added and the mixture extracted three times with ethyl acetate. Purification on silica gel with a gradient of MeOH/CH2Cl2 afforded [2-amino-5-(3,4-dimethoxy-phenyl)-pyridin-3-yl]-[6-(2-methoxy-ethylamino)-pyridin-3-yl]-methanone as a yellow solid (74% yield). 1H NMR (DMSO-d6): δ 8.49 (d, J=2.0 Hz, 1H), 8.33 (d, J=2.5 Hz, 1H), 7.85 (d, J=2.0 Hz, 1H), 7.73 (d, J=8.5 Hz, 1H), 7.58 (broad s, 1H), 7.14 (s, 1H), 7.05 (m, 3H), 6.98 (d, J=8.5 Hz, 1H), 6.59 (d, J=9.0 Hz, 1H), 3.79 (s, 3H), 3.75 (s, 3H), 3.50 (broad t, J=5.0 Hz, 2H), 3.46 (t, J=5.0 Hz, 2H), 3.26 (s, 3H); HPLC/MS m/z: 409.2 [MH]+.

1. concentrationan overall concentration of the starting material of 0.10 m
2. additionWater was added
3. extractionthe mixture extracted three times with ethyl acetate
4. customPurification on silica gel with a gradient of MeOH/CH2Cl2