4-Chloro-6-methyl-1,3,5-triazin-2-amine → 4-(2-Fluoro-5-methoxypyridin-3-yl)-6-methyl-1,3,5-triazin-2-amine

HRID 1621944

Reaction equation

HRID 1621944 reaction equation
Cl[C:2]1[N:7]=[C:6]([CH3:8])[N:5]=[C:4]([NH2:9])[N:3]=1.[F:10][C:11]1[C:16](B(O)O)=[CH:15][C:14]([O:20][CH3:21])=[CH:13][N:12]=1.C([O-])(=O)C.[K+]>CCO.O>[F:10][C:11]1[C:16]([C:2]2[N:7]=[C:6]([CH3:8])[N:5]=[C:4]([NH2:9])[N:3]=2)=[CH:15][C:14]([O:20][CH3:21])=[CH:13][N:12]=1

Participants

6

Reactant 3

HCID 305914-Chloro-6-methyl-1,3,5-triazin-2-amineHCID 517044Potassium AcetateHCID 574973352-Fluoro-5-methoxypyridine-3-boronic acid

Product 1

HCID 666111694-(2-Fluoro-5-methoxypyridin-3-yl)-6-methyl-1,3,5-triazin-2-amine

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 962WaterSolvent

Conditions

Temperature
100 °C

Procedure

To a 20 mL microwave reaction tube was added 4-chloro-6-methyl-1,3,5-triazin-2-amine (Example 9, 1.02 g, 7.05 mmol), 2-fluoro-5-methoxypyridin-3-ylboronic acid (1.67 g, 9.77 mmol), Am-Phos (Aldrich, 0.255 g, 0.360 mmol) and potassium acetate (Aldrich, 2.11 g, 21.5 mmol) in EtOH (10 mL) and water (1 mL). The mixture was degassed by bubbling argon through for 5 min. The tube was heated in a microwave reactor (Biotage) at 100° C. for 20 min. The reaction mixture was partitioned between water (200 mL) and EtOAc (200 mL). Layers were separated and insoluble material was collected (precipitate 1). The aqueous phase was further extracted with 10% isopropanol in chloroform (3×100 mL). Each organic phase was dried over sodium sulfate, filtered and concentrated in vacuo. Upon addition of DCM to the crude product, precipitate came out and the solid was collected via filtration. The first precipitate (precipitate 1) and the solid from extraction were all desired product (1.17 g, 70.3%). 1H NMR (400 MHz, CDCl3) δ ppm 8.08 (dd, J=7.53, 3.23 Hz, 1H) 7.97 (dd, J=3.03, 1.86 Hz, 1H) 5.47 (br. s., 2H) 3.92 (s, 3H) 2.54 (s, 3H). m/z (ESI, positive ion): 236.0 (M+H)+.

Workup

  1. customThe mixture was degassed
  2. customby bubbling argon through for 5 min
  3. customThe reaction mixture was partitioned between water (200 mL) and EtOAc (200 mL)
  4. customLayers were separated
  5. custominsoluble material was collected (precipitate 1)
  6. extractionThe aqueous phase was further extracted with 10% isopropanol in chloroform (3×100 mL)
  7. dry with materialEach organic phase was dried over sodium sulfate
  8. filtrationfiltered
  9. concentrationconcentrated in vacuo
  10. additionUpon addition of DCM to the crude product, precipitate
  11. filtrationthe solid was collected via filtration
  12. extractionThe first precipitate (precipitate 1) and the solid from extraction

Sources & evidence

ORD record
ord-f149619c22a147898e2d3d370d2dfc74
Source dataset
uspto-grants-2014_07
Patent number
US08772480B2

Linked notes

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