反应详情

A mixture of (1-(tert-butoxycarbonyl)-4-fluoro-1H-indol-2-yl)boronic acid (5 g, 18.0 mmol), 6-chloro-2-iodopyridin-3-ol (3.82 g, 15.0 mol) and NaHCO3 (3.78 g, 45.0 mol) in 1,4-dioxane (76 mL) and water (7 mL) was stirred at room temperature for 15 min. Then Pd(PPh3)2Cl2 (527 mg, 0.75 mmol) was added under nitrogen atmosphere, and the mixture was heated at 100° C. under N2 for 16 hours. The reaction mixture was cooled to room temperature, diluted with EtOAc (50 mL), filtered and concentrated. The residue was diluted with H2O (60 mL) and EtOAc (30 mL), and the layer was separated, the aqueous layer was extracted with EtOAc (3*30 mL). The combined organic layers were washed with brine (50 mL), dried over Na2SO4, filtered and concentrated. The residue was purified by column chromatography (PE/EtOAc=20/1˜3/1) to give 6-chloro-2-(4-fluoro-1H-indol-2-yl)pyridin-3-ol (3 g, yield: 76.5%). 1H-NMR (MeOD, 400 MHz) δ 7.36 (s, 1H), 7.23˜7.27 (m, 2H), 7.03˜7.11 (m, 2H), 6.6˜36.68 (m, 1H). MS (M+H)+: 263/265.

1. temperaturethe mixture was heated at 100° C. under N2 for 16 hours
2. temperatureThe reaction mixture was cooled to room temperature
3. filtrationfiltered
4. concentrationconcentrated
5. additionThe residue was diluted with H2O (60 mL) and EtOAc (30 mL)
6. customthe layer was separated
7. extractionthe aqueous layer was extracted with EtOAc (3*30 mL)
8. washThe combined organic layers were washed with brine (50 mL)
9. dry with materialdried over Na2SO4
10. filtrationfiltered
11. concentrationconcentrated
12. customThe residue was purified by column chromatography (PE/EtOAc=20/1˜3/1)