反应详情

温度

120 °C

To a 50 mL tube was added 2-[(2,5-dichloro-4-pyridinyl)amino]benzonitrile (738 mg, 2.80 mmol), 1-ethyl-3-methyl-1H-pyrazol-5-amine (350 mg, 2.80 mmol), BINAP (696 mg, 1.118 mmol), cesium carbonate (2733 mg, 8.39 mmol) and palladium(II) acetate (62.8 mg, 0.280 mmol) in 1,4-dioxane (15 mL). The reaction mixture was heated to 120° C. for 18 hr. Solid was filtered off and discarded and the solution was concentrated. Product was then dissolved in 1 M HCl (1 mL) and extracted with EtOAc. The organic layer was discarded. The water layer was neutralized with 1 M NaOH (to pH 8) and extracted with EtoAc. The organic layer was separated, washed with brine, dried over MgSO4, filtered and evaporated. The solid was the dissolved in 20 mL of EtOAc and 20 mL of water and 1 mL of acetic acid were added. The organic layer was separated, washed with brine, dried over MgSO4, filtered and evaporated. 2-({5-Chloro-2-[(1-ethyl-3-methyl-1H-pyrazol-5-yl)amino]-4-pyridinyl}amino)benzonitrile (450 mg, 1.275 mmol, 45.6% yield) was isolated as orange foam. This product was used in the next step without further purification. LCMS (M+H)+=353.1; 1H NMR (400 MHz, DMSO-d6) ppm 1.19 (t, J=7.20 Hz, 3 H) 1.91 (s, 3 H) 3.84 (q, J=7.24 Hz, 2 H) 5.92 (s, 1 H) 6.03 (s, 1 H) 7.41 (td, J=7.64, 0.88 Hz, 1 H) 7.48 (d, J=8.08 Hz, 1 H) 7.76 (td, J=7.83, 1.52 Hz, 1 H) 7.91 (dd, J=7.83, 1.52 Hz, 1 H) 7.96 (s, 1 H) 8.47 (d, J=7.07 Hz, 1 H) 11.98 (br. s., 1 H)

1. filtrationSolid was filtered off
2. concentrationthe solution was concentrated
3. dissolutionProduct was then dissolved in 1 M HCl (1 mL)
4. extractionextracted with EtOAc
5. extractionextracted with EtoAc
6. customThe organic layer was separated
7. washwashed with brine
8. dry with materialdried over MgSO4
9. filtrationfiltered
10. customevaporated
11. dissolutiondissolved in 20 mL of EtOAc
12. addition20 mL of water and 1 mL of acetic acid were added
13. customThe organic layer was separated
14. washwashed with brine
15. dry with materialdried over MgSO4
16. filtrationfiltered
17. customevaporated