Sodium hydride → 1-methyl-4-(4-methylphenyl)-3-(2-phenoxyethoxy)-1H-pyrazol-5-amine

HRID 1368635Notes

Reaction equation

HRID 1368635 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.[H-].[Na+].Br[CH2:19][CH2:20][O:21][C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1>CN(C)C=O.O>[CH3:7][N:6]1[C:2]([NH2:1])=[C:3]([C:9]2[CH:14]=[CH:13][C:12]([CH3:15])=[CH:11][CH:10]=2)[C:4]([O:8][CH2:19][CH2:20][O:21][C:22]2[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=2)=[N:5]1

Participants

6

Reactant 3

HCID 24758Sodium hydrideHCID 68526Benzene, (2-bromoethoxy)-HCID 1784239155-amino-1-methyl-4-(4-methylphenyl)-1H-pyrazol-3-ol

Product 1

HCID 222820241-methyl-4-(4-methylphenyl)-3-(2-phenoxyethoxy)-1H-pyrazol-5-amineYield 25.1%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

To 5-amino-1-methyl-4-(4-methylphenyl)-1H-pyrazol-3-ol (Preparation 3a) (50 mg) in dimethylformamide (2 ml) at room temperature was added sodium hydride (60% dispersion in oil, 10 mg) and β-bromophenetole (49.5 mg). The mixture was stirred for 2 hrs. The reaction was diluted with water (10 ml) and extracted with ethyl acetate (10 ml). The organic fraction was dried over magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by column chromatography on silica (10 g) eluted with ether to yield the title compound as a white solid (20 mg).

Workup

  1. extractionextracted with ethyl acetate (10 ml)
  2. dry with materialThe organic fraction was dried over magnesium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated under reduced pressure
  5. customThe residue was purified by column chromatography on silica (10 g)
  6. washeluted with ether

Sources & evidence

ORD record
ord-af01a8ef555d4b499e82d3317c3153f4
Source dataset
uspto-grants-2003_06
Patent number
US06573270B1

Reaction notes

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