反应详情

温度

90 °C

A mixture of 1-(3-bromopyridin-4-yl)ethanone (50 mg, 0.250 mmol), 3-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzo[d]oxazol-2(3H)-one (68.8 mg, 0.250 mmol), polymer bound PalladiumTetrakis (56.8 mg, 6.25 μmol) and sodium carbonate (250 μl, 0.500 mmol) in toluene (1 mL) and ethanol (1 mL) was heated to 90° C. in microwave for 45 min. After filtration through a pad of Na2SO4, the solvent was removed in vacuum. The residue was purified by flash column (MeOH—CH2Cl2, v/v, 1%-1.5%) and yielded colorless solid (37 mg). ESI-MS m/z: 269.0 [M+1]+, Retention time 1.03 min; 1H NMR (400.3 MHz, CDCl3): δ 2.13 (s, 3H), 344 (s, 3H), 6.95 (d, J=1.48 Hz, 1H), 7.07 (dd, J=8.2, 1.68 Hz, 1H), 7.29 (d, J=8.2 Hz, 1H), 7.37 (d J=5 Hz, 1H), 8.69 (s, 1H), 8.73 (d, J=5 Hz, 1H).

1. filtrationAfter filtration through a pad of Na2SO4
2. customthe solvent was removed in vacuum
3. customThe residue was purified by flash column (MeOH—CH2Cl2, v/v, 1%-1.5%)