Cesium carbonate → 4-[1-methyl-3-(trifluoromethyl)-1H-pyrazol-5-yl]phenol

HRID 508415Notes

Reaction equation

HRID 508415 reaction equation
I[C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[CH:4][CH:3]=1.[CH3:9][N:10]1[C:14](B(O)O)=[CH:13][C:12]([C:18]([F:21])([F:20])[F:19])=[N:11]1.C(=O)([O-])[O-].[Cs+].[Cs+]>O.O1CCOCC1.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[CH3:9][N:10]1[C:14]([C:2]2[CH:7]=[CH:6][C:5]([OH:8])=[CH:4][CH:3]=2)=[CH:13][C:12]([C:18]([F:21])([F:20])[F:19])=[N:11]1

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 108944-IodophenolHCID 120567131-Methyl-3-(trifluoroMethyl)pyrazole-5-boronic acid

Product 1

HCID 1363877554-[1-methyl-3-(trifluoromethyl)-1H-pyrazol-5-yl]phenolYield 74.1%

Reagents, catalysts & solvents 3

HCID 178418476HCID 178418476, compoundCatalystHCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
90 °C

Procedure

To a solution of 4-iodophenol (75 mg, 0.34 mmol) in a mixture of water (1 mL) and 1,4-dioxane (2 mL) was added [1-methyl-3-(trifluoromethyl)-1H-pyrazol-5-yl]boronic acid (Preparation 7, 90 mg, 0.46 mmol), dichlorobis(triphenylphosphine)palladium(II) (18.3 mg, 0.03 mmol) and cesium carbonate (240 mg, 0.74 mmol). The resulting mixture was heated at 90° C. in a Reactivial™ for 4 hours. The reaction mixture was cooled to room temperature and partitioned between ethyl acetate (10 mL) and brine (2×10 mL). The organic extract was dried over anhydrous sodium sulfate and evaporated in vacuo. The crude material was purified by flash column chromatography using the ISCO™ system (12 g column), eluting with 70:30 heptane/ethyl acetate. Fractions containing product were combined and concentrated in vacuo to afford the title compound as a white solid (61 mg, 73%).

Workup

  1. temperatureThe reaction mixture was cooled to room temperature
  2. custompartitioned between ethyl acetate (10 mL) and brine (2×10 mL)
  3. extractionThe organic extract
  4. dry with materialwas dried over anhydrous sodium sulfate
  5. customevaporated in vacuo
  6. customThe crude material was purified by flash column chromatography
  7. washeluting with 70:30 heptane/ethyl acetate
  8. additionFractions containing product
  9. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-5608a6e032a341049ac040513c905687
Source dataset
uspto-grants-2015_08
Patent number
US09096500B2

Reaction notes

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