反应详情

A solution of 4-chloro-2-[(2,5-dichloro-4-pyridinyl)amino]benzonitrile (2.8 g, 9.38 mmol), 3-methyl-1-(1-methylethyl)-1H-pyrazol-5-amine (1.305 g, 9.38 mmol) and cesium carbonate (9.17 g, 28.1 mmol) in 1,4-dioxane (40 mL) was degassed. DPEPhos (0.404 g, 0.750 mmol) followed by palladium acetate (0.084 g, 0.375 mmol) were added, and the suspension was refluxed overnight. The solid was filtered, the reaction mixture was evaporated. The black oil was purified by flush column chromatography on silica gel (5% EtOAc:DCM). The combined fractions were evaporated. The resulting oil was dissolved in dioxane (20 mL) and sodium hydroxide (20 mL, 20.00 mmol) was added and the reaction mixture was refluxed overnight. The layers were separated and the organic layer was washed with 20 ml of 1 M NaOH. The aqueous layers were combined and washed with EtOAc. The combined organic layers were washed with water, brine and dried over MgSO4 and filtered. The solution was evaporated, suspended in acetonitrile and filtered. 4-Chloro-2-[(5-chloro-2-{[3-methyl-1-(1-methylethyl)-1H-pyrazol-5-yl]amino}-4-pyridinyl)amino]benzoic acid (260 mg, 0.619 mmol, 6.60% yield) was isolated as a yellow solid. 1H NMR (400 MHz, DMSO-d6) ppm 1.28 (d, J=6.57 Hz, 6 H) 1.91 (s, 1 H) 2.13 (s, 3 H) 4.43 (quin, J=6.57 Hz, 1 H) 5.97 (s, 1 H) 6.78 (s, 1 H) 7.05 (dd, J=8.46, 1.89 Hz, 1 H) 7.48 (d, J=1.77 Hz, 1 H) 7.96 (d, J=8.34 Hz, 1 H) 8.03 (s, 1 H) 8.61 (s, 1H); HPLC Rt=2.70 min, MS (ESI): 420.1, 422.0 [M+H]+.

1. additionwere added
2. temperaturethe suspension was refluxed overnight
3. filtrationThe solid was filtered
4. customthe reaction mixture was evaporated
5. customThe black oil was purified
6. customby flush column chromatography on silica gel (5% EtOAc:DCM)
7. customThe combined fractions were evaporated
8. dissolutionThe resulting oil was dissolved in dioxane (20 mL)
9. temperaturethe reaction mixture was refluxed overnight
10. customThe layers were separated
11. washthe organic layer was washed with 20 ml of 1 M NaOH
12. washwashed with EtOAc
13. washThe combined organic layers were washed with water, brine
14. dry with materialdried over MgSO4
15. filtrationfiltered
16. customThe solution was evaporated
17. filtrationfiltered