反应详情

5-(2-Chloropyridin-4-yloxy)pyridin-2-amine (0.47 g, 2.121 mmol) was dissolved in DMF (11 ml). Water (3.67 ml) was added to the mixture, followed by 1-methyl-4(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)1H-pyrazole (0.662 g, 3.18 mmol), and cesium carbonate (2.63 g, 8.06 mmol). Argon was bubbled through the mixture for several minutes, and then palladium tetrakistriphenylphosphine (0.245 g, 0.212 mmol) was added. The flask was fitted with a condenser and argon was flushed through the system. The reaction mixture was then placed in a 90° C. oil bath under a balloon of argon and heated for 23 hours. The solution was then cooled to RT and diluted with THF (75 mL) and washed with brine (2×50 mL). The combined aqueous layers were then back extracted with THF (40 mL). The combined organic layers were dried (MgSO4), concentrated under reduced pressure and purified via silica gel chromatography (THF-ethyl acetate) to yield 5-(2-(1-methyl-1H-pyrazol-4-yl)pyridin-4-yloxy)pyridin-2-amine as an off-white solid (0.357 g, 63% yield). 1H NMR (400 MHz, DMSO-d6): δ 8.31 (d, 1H), 8.22 (s, 1H), 7.92 (s, 1H), 7.80 (d, 1H), 7.27 (dd, 1H), 7.14 (d, 1H), 6.85 (s, 6.57 (dd, 1H), 6.01 (s, 2H), 3.84 (s, 3H); MS (ESI) m/z: 268.1 (M+H+).

1. customArgon was bubbled through the mixture for several minutes
2. customThe flask was fitted with a condenser
3. customargon was flushed through the system
4. customwas then placed in a 90° C.
5. temperatureheated for 23 hours
6. additiondiluted with THF (75 mL)
7. washwashed with brine (2×50 mL)
8. extractionThe combined aqueous layers were then back extracted with THF (40 mL)
9. dry with materialThe combined organic layers were dried (MgSO4)
10. concentrationconcentrated under reduced pressure
11. custompurified via silica gel chromatography (THF-ethyl acetate)