Potassium Carbonate → 2-{[5-amino-1-methyl-4-(4-methylphenyl)-1H-pyrazol-3-yl]oxy}ethyl acetate

HRID 1368636Notes

Reaction equation

HRID 1368636 reaction equation
[NH2:1][C:2]1[N:6]([CH3:7])[N:5]=[C:4]([OH:8])[C:3]=1[C:9]1[CH:14]=[CH:13][C:12]([CH3:15])=[CH:11][CH:10]=1.C(=O)([O-])[O-].[K+].[K+].[C:22]([O:25][CH2:26][CH2:27]Br)(=[O:24])[CH3:23]>CN(C)C=O.O>[C:22]([O:25][CH2:26][CH2:27][O:8][C:4]1[C:3]([C:9]2[CH:14]=[CH:13][C:12]([CH3:15])=[CH:11][CH:10]=2)=[C:2]([NH2:1])[N:6]([CH3:7])[N:5]=1)(=[O:24])[CH3:23]

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 135641-Acetoxy-2-bromoethaneHCID 1784239155-amino-1-methyl-4-(4-methylphenyl)-1H-pyrazol-3-ol

Product 1

HCID 222820022-{[5-amino-1-methyl-4-(4-methylphenyl)-1H-pyrazol-3-yl]oxy}ethyl acetateYield 42.5%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

To 5-amino-1-methyl-4-(4-methylphenyl)-1H-pyrazol-3-ol (Preparation 3a) (250 mg) in dimethyl formamide (5 ml) at room temperature was added potassium carbonate (510 mg) and 2-bromoethyl acetate (205 mg), the mixture was stirred for 16 hrs. The reaction was diluted with water (60 ml) and extracted with ethyl acetate (3×30 ml). The organic fractions were combined, washed with water (2×30 ml) and brine (30 ml) and dried over magnesium sulfate, filtered concentrated under reduced pressure. The residue was purified by column chromatography (silica, 30 g) eluted with ethyl acetate:hexane (1:1) to yield the title compound as a white solid (151 mg).

Workup

  1. extractionextracted with ethyl acetate (3×30 ml)
  2. washwashed with water (2×30 ml) and brine (30 ml)
  3. dry with materialdried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe residue was purified by column chromatography (silica, 30 g)
  7. washeluted with ethyl acetate:hexane (1:1)

Sources & evidence

ORD record
ord-a2bbd010f8f8426693b4cab79d26767c
Source dataset
uspto-grants-2003_06
Patent number
US06573270B1

Reaction notes

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