反应详情

温度

80 °C

2-Bromo-5-chloropyridine (2.04 g, 10.6 mmol), 2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (2.50 g, 10.6 mmol), K2CO3 (4.38 g, 31.8 mmol) and PdCl2 (dppf) (0.40 g, 0.53 mmol) were stirred in DMSO (20 mL). The reaction mixture was degassed, then back-filled with N2. The reaction mixture was stirred at 80° C. in a pre-heated oil bath for 2 hours. After cooling, the reaction was quenched with water and extracted with CH2Cl2. The organic layer was washed with H2O and 5% LiCl, dried with Na2SO4, filtered and concentrated. Flash chromatography (silica gel, hexanes/EtOAc), 100:0 to 50:50) afforded the title compound (810 mg, 34%) as a white solid: 1H NMR (300 MHz, CDCl3) δ 8.67 (d, J=2.0 Hz, 1H), 8.27 (d, J=5.3 Hz, 1H), 7.79-7.75 (dd, J=8.8, 2.3 Hz, 1H), 7.70 (d, J=8.3 Hz, 1H), 7.46-7.44 (dd, J=5.3, 1.5 Hz, 1H), 7.30 (s, 1H), 3.99 (s, 3H).

1. customThe reaction mixture was degassed
2. additionback-filled with N2
3. temperatureAfter cooling
4. customthe reaction was quenched with water
5. extractionextracted with CH2Cl2
6. washThe organic layer was washed with H2O and 5% LiCl
7. dry with materialdried with Na2SO4
8. filtrationfiltered
9. concentrationconcentrated