Potassium Carbonate → 3-[1-ethyl-5-(4-fluoro-2-nitrophenoxy)-1H-pyrazol-3-yl]benzonitrile

HRID 540757Notes

Reaction equation

F[C:2]1[CH:7]=[CH:6][C:5]([F:8])=[CH:4][C:3]=1[N+:9]([O-:11])=[O:10].[CH2:12]([N:14]1[C:18](=[O:19])[CH:17]=[C:16]([C:20]2[CH:21]=[C:22]([CH:25]=[CH:26][CH:27]=2)[C:23]#[N:24])[NH:15]1)[CH3:13].C(=O)([O-])[O-].[K+].[K+]>CS(C)=O.O>[CH2:12]([N:14]1[C:18]([O:19][C:2]2[CH:7]=[CH:6][C:5]([F:8])=[CH:4][C:3]=2[N+:9]([O-:11])=[O:10])=[CH:17][C:16]([C:20]2[CH:21]=[C:22]([CH:25]=[CH:26][CH:27]=2)[C:23]#[N:24])=[N:15]1)[CH3:13]

Participants

Conditions

Temperature: 80 °C

Procedure

1,4-difluoro-2-nitrobenzene (2.06 g, 9.85 mmol, 3 equiv) was added to a stirring mixture of 3-(1-ethyl-5-oxo-2,5-dihydro-1H-pyrazol-3-yl)benzonitrile (0.70 g, 3.28 mmol, 1 equiv) and potassium carbonate (1.36 g, 9.85 mmol, 3 equiv) in DMSO (6.57 mL). The reaction mixture was stirred at 80° C. for 20 minutes then cooled to 22° C. and diluted with water. The mixture was extracted with ethyl acetate, and then the organic layer was washed sequentially with water (two times) and saturated aqueous sodium chloride. The washed solution was dried over anhydrous magnesium sulfate. The drying agent was filtered, and the filtrate was concentrated in vacuo to give the 3-[1-ethyl-5-(4-fluoro-2-nitrophenoxy)-1H-pyrazol-3-yl]benzonitrile. The crude reaction product was taken into the next step without further purification. Calcd (M+1)+: 353.1. Found: 353.2.

Workup

temperaturethen cooled to 22° C.
extractionThe mixture was extracted with ethyl acetate
washthe organic layer was washed sequentially with water (two times) and saturated aqueous sodium chloride
dry with materialThe washed solution was dried over anhydrous magnesium sulfate
filtrationThe drying agent was filtered
concentrationthe filtrate was concentrated in vacuo

Sources & evidence

ORD record: ord-7cd8692b71a2491a9793de275956561a
Source dataset: uspto-grants-2014_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08871796B2

Reaction notes

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