反应详情

To a nitrogen flushed flask containing 5-(4-chloro-2-fluorophenyl)pyrazin-2-amine (82.8 g, 370 mmol), (2-(N-(tert-butyl)sulfamoyl)phenyl)boronic acid (100.0 g, 388.9 mmol), and chloro(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II) (5.83 g, 7.41 mmol) were added N2 sparged THF (926 mL) and sparged 0.5 M K3PO4(aq) (1.65 L, 825 mmol). The mixture was stirred for 15 hours at room temperature. The layers were separated and the organic layer was washed with 600 mL brine, dried over MgSO4, filtered, and concentrated to dryness to give a solid residue. The solid was dissolved in 900 mL DMA, stirred with 60 g activated charcoal at 80° Celsius for 2 hours, and then stirred at room temperature for an additional 16 hours. The charcoal was removed by filtration and then washed with 150 mL DMA. The combined filtrates were treated three times with fresh Silicycle brand SiliaMetS Thiol Pd Scavenger (30 g, 15 g, 7.5 g) in DMA at 80° Celsius for 8 hours to 16 hours. Upon cooling to rt the scavenger was filtered off and the filtrate was concentrated to dryness. The resulting solid was triturated in toluene (1.2 L) at 90° Celsius for 2 hours. Upon cooling to rt the solid was collected by filtration and washed twice with toluene (700 mL) and twice with hexanes (700 mL) yielding the title compound (120.0 g, 80.9%). MS (ESI): mass calcd. for C20H21FN4O2S, 400.14; m/z found, 401.1 [M+H]+. 1H NMR (600 MHz, DMSO-d6) δ 8.42-8.37 (m, 1H), 8.10-8.02 (m, 2H), 7.95-7.86 (m, 1H), 7.70-7.63 (m, 1H), 7.63-7.58 (m, 1H), 7.41-7.35 (m, 1H), 7.35-7.26 (m, 2H), 7.00-6.92 (s, 1H), 6.79-6.66 (s, 2H), 1.10-0.95 (s, 9H).

1. customsparged THF (926 mL)
2. customThe layers were separated
3. washthe organic layer was washed with 600 mL brine
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated to dryness
7. customto give a solid residue
8. stirringstirred with 60 g
9. customat 80° Celsius
10. customfor 2 hours
11. stirringstirred at room temperature for an additional 16 hours
12. customThe charcoal was removed by filtration
13. washwashed with 150 mL DMA
14. additionThe combined filtrates were treated three times with fresh Silicycle brand SiliaMetS Thiol Pd Scavenger (30 g, 15 g, 7.5 g) in DMA at 80° Celsius for 8 hours to 16 hours
15. temperatureUpon cooling to rt the scavenger
16. filtrationwas filtered off
17. concentrationthe filtrate was concentrated to dryness
18. customThe resulting solid was triturated in toluene (1.2 L) at 90° Celsius for 2 hours
19. temperatureUpon cooling to rt the solid
20. filtrationwas collected by filtration
21. washwashed twice with toluene (700 mL) and twice with hexanes (700 mL)