反应详情

温度

90 °C

5-(2-chloropyridin-4-yloxy)-4-methylpyridin-2-amine (0.116 g, 0.492 mmol) was dissolved in DMF (2 ml) and 1-methyl-1H-pyrazole-4-boronic acid pinacol ester (0.154 g, 0.738 mmol) was added, followed by cesium carbonate (0.481 g, 1.477 mmol) and water (0.667 ml). Argon was bubbled through the mixture for several minutes, and then palladium tetrakistriphenylphosphine (0.028 g, 0.025 mmol) was added. The flask was fitted with a reflux condenser, flushed with argon, and heated under a balloon of argon at 90° C. for 16 hours. The mixture was then cooled to RT, and the solution was diluted with a 4:1 mix of ethyl acetate and THF (70 mL). It was washed with 10% aqueous LiCl (2×50 mL) and brine (50 mL), dried (MgSO4), evaporated in vacuo and purified via silica gel chromatography (DCM/MeOH) to yield 4-methyl-5-(2-(1-methyl-1H-pyrazol-4-yl)pyridin-4-yloxy)pyridin-2-amine as a clear oil (0.084 g, 61% yield). 1H NMR (400 MHz, DMSO-d6): δ 8.30 (d, 1H), 8.22 (s, 1H), 7.93 (s, 1H), 7.69 (s, 1H), 7.11 (d, 1H), 6.50 (dd, 1H), 6.38 (s, 1H), 5.89 (s, 2H), 3.84 (s, 3H), 1.95 (s, 3H); MS (ESI) m/z: 282.1 (M+H+).

1. customArgon was bubbled through the mixture for several minutes
2. customThe flask was fitted with a reflux condenser
3. customflushed with argon
4. temperatureThe mixture was then cooled to RT
5. additionthe solution was diluted with a 4:1
6. additionmix of ethyl acetate and THF (70 mL)
7. washIt was washed with 10% aqueous LiCl (2×50 mL) and brine (50 mL)
8. dry with materialdried (MgSO4)
9. customevaporated in vacuo
10. custompurified via silica gel chromatography (DCM/MeOH)