反应详情

温度

65 °C

A mixture of 5-bromo-6-chloro-2-(4-fluorophenyl)-N-methylfuro[2,3-b]pyridine-3-carboxamide (5.0 g, 13 mmol), (3-(tert-butoxycarbonyl)phenyl)boronic acid (2.75 g, 12.4 mmol). Pd(Ph3P)4 (2.26 g, 1.96 mmol) and cesium carbonate (8.49 g, 26.1 mmol) was degassed/charged with N2 and diluted with water (22 ml)/DMF (220 ml). The resultant mixture was then degassed, charged with N2, heated to an internal temperature of 65° C. and allowed to stir under N2 atmosphere for 16 h. The reaction mixture was cooled to rt then diluted with EtOAc and sat. 1M HCl. The layers were separated and the aq layer was extracted with EtOAc (3×10 mL). The combined organic extracts were washed with water, brine, dried over Na2SO4 filtered and concentrated. The resultant solid was then flashed on SiO2 eluting with a 0-100% EtOAc in hexanes gradient over 16 CV to give tert-butyl 3-(6-chloro-2-(4-fluorophenyl)-3-(methylcarbamoyl)furo[2,3-b]pyridin-5-yl)benzoate (5.2 g, 11 mmol, 83% yield) as a slightly yellow solid contaminated with the bis-coupled product di-tert-butyl 3,3′-(2-(4-fluorophenyl)-3-(methylcarbamoyl)furo[2,3-b]pyridine-5,6-diyl)dibenzoate. 1H NMR (500 MHz, CHLOROFORM-d) δ 8.18 (s, 1H), 8.08-8.02 (m, 2H), 7.95-7.89 (m, 2H), 7.63 (dt, J=7.6, 1.5 Hz, 1H), 7.52 (t, J=7.6 Hz, 1H), 7.24-7.18 (m, 2H), 6.03 (d, J=4.3 Hz, 1H), 2.99 (d, J=4.9 Hz, 3H), 1.62 (s, 9H).

1. customThe resultant mixture was then degassed
2. additioncharged with N2
3. temperatureThe reaction mixture was cooled to rt
4. additionthen diluted with EtOAc and sat. 1M HCl
5. customThe layers were separated
6. extractionthe aq layer was extracted with EtOAc (3×10 mL)
7. washThe combined organic extracts were washed with water, brine
8. dry with materialdried over Na2SO4
9. filtrationfiltered
10. concentrationconcentrated