Trifluoroacetic anhydride → HCID 68988270, compound

HRID 1874395Notes

Reaction equation

HRID 1874395 reaction equation
[NH2:1][C:2](=O)[CH2:3][N:4]1[CH:9]([NH:10]S(C2C=CC(C)=CC=2)(=O)=O)[CH:8]=[CH:7][C:6]([O:21][C:22]2[CH:23]=[CH:24][C:25]([CH3:38])=[C:26]([NH:28][C:29]([C:31]3[N:35]([CH3:36])[N:34]=[C:33]([CH3:37])[CH:32]=3)=[O:30])[CH:27]=2)=[CH:5]1.FC(F)(F)C(OC(=O)C(F)(F)F)=O>ClCCl>[NH2:1][C:2]1[N:10]=[C:9]2[CH:8]=[CH:7][C:6]([O:21][C:22]3[CH:23]=[CH:24][C:25]([CH3:38])=[C:26]([NH:28][C:29]([C:31]4[N:35]([CH3:36])[N:34]=[C:33]([CH3:37])[CH:32]=4)=[O:30])[CH:27]=3)=[CH:5][N:4]2[CH:3]=1

Participants

4

Reactant 2

HCID 9845Trifluoroacetic anhydrideHCID 68990670HCID 68990670, compound

Product 1

HCID 68988270HCID 68988270, compoundYield 68.4%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A mixture of N-{5-[(1-(2-amino-2-oxoethyl)-6-{[(4-methylphenyl)sulfonyl]amino}-1,6-dihydropyridin-3-yl)oxy]-2-methylphenyl}-1,3-dimethyl-1H-pyrazole-5-carboxamide (2.34 g, 4.27 mmol), trifluoroacetic anhydride (15 mL) and dichloromethane (20 mL) was stirred at room temperature for 5 hr. The reaction solution was concentrated under reduced pressure, 1N aqueous sodium hydroxide solution (20 mL) and ethanol (20 mL) were added to the residue and the mixture was stirred at room temperature for 1 hr. 8N Aqueous sodium hydroxide solution (4 mL) was further added and the mixture was stirred at room temperature for 15 hr. The reaction mixture was diluted with water and extracted with ethyl acetate (×3). The organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate and filtrated. The filtrate was concentrated under reduced pressure, and the residue was collected by filtration and washed with ethyl acetate-hexane to give N-{5-[(2-aminoimidazo[1,2-a]pyridin-6-yl)oxy]-2-methylphenyl}-1,3-dimethyl-1H-pyrazole-5-carboxamide (1.10 g, 68%) as a white solid. To a solution of N-{5-[(2-aminoimidazo[1,2-a]pyridin-6-yl)oxy]-2-methylphenyl}-1,3-dimethyl-1H-pyrazole-5-carboxamide (1.10 g, 2.92 mmol) thus-obtained and triethylamine (1.21 mL, 8.76 mmol) in tetrahydrofuran (15 mL) was added with stirring under ice-cooling cyclopropanecarbonyl chloride (345 μL, 3.80 mmol), and the mixture was stirred at room temperature for 2 hr. The reaction mixture was diluted with water and extracted with ethyl acetate. The organic layer was washed with water and saturated brine, dried over anhydrous magnesium sulfate and filtrated. The filtrate was concentrated under reduced pressure, and the residue was purified by column chromatography (silica gel, hexane/ethyl acetate=70/30→40/100) and recrystallized from ethyl acetate-hexane to give the title compound (863 mg, 60%) as a white solid.

Workup

  1. concentrationThe reaction solution was concentrated under reduced pressure, 1N aqueous sodium hydroxide solution (20 mL) and ethanol (20 mL)
  2. additionwere added to the residue
  3. stirringthe mixture was stirred at room temperature for 1 hr
  4. addition8N Aqueous sodium hydroxide solution (4 mL) was further added
  5. stirringthe mixture was stirred at room temperature for 15 hr
  6. additionThe reaction mixture was diluted with water
  7. extractionextracted with ethyl acetate (×3)
  8. washThe organic layer was washed with saturated brine
  9. dry with materialdried over anhydrous magnesium sulfate
  10. filtrationfiltrated
  11. concentrationThe filtrate was concentrated under reduced pressure
  12. filtrationthe residue was collected by filtration
  13. washwashed with ethyl acetate-hexane

Sources & evidence

ORD record
ord-091b57be48cd4af78b11429c4ffcf310
Source dataset
uspto-grants-2012_11
Patent number
US08304557B2

Reaction notes

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