Water → 4-bromomethyl-5-fluoro-1-phenyl-3-trifluoromethyl-1H-pyrazole

HRID 1292791Notes

Reaction equation

[F:1][C:2]1[N:6]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)[N:5]=[C:4]([C:13]([F:16])([F:15])[F:14])[C:3]=1[CH2:17]O.P(Br)(Br)[Br:20].O>C(OCC)C>[Br:20][CH2:17][C:3]1[C:4]([C:13]([F:16])([F:15])[F:14])=[N:5][N:6]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)[C:2]=1[F:1]

Participants

Conditions

Temperature: 0 °C

Procedure

A solution of 27.5 g (105.7 mmoles) of (5-fluoro-1-phenyl-3-trifluoromethyl-1H-pyrazol-4-yl)-methanol dissolved in 300 ml of diethyl ether was cooled to 0° C. Thereto was added 10.0 g (37.0 mmoles) of phosphorus tribromide. The mixture was stirred at room temperature for 2 hours to give rise to a reaction. After the completion of the reaction, the reaction mixture was poured into water, followed by extraction with diethyl ether. The resulting organic layer was washed with an aqueous sodium chloride solution and then dried over anhydrous magnesium sulfate. The resulting solution was subjected to vacuum distillation to remove the solvent contained therein, to obtain 30.3 g (yield: 88.8%) of 4-bromomethyl-5-fluoro-1-phenyl-3-trifluoromethyl-1H-pyrazole.

Workup

customto give rise
customto a reaction
customAfter the completion of the reaction
extractionfollowed by extraction with diethyl ether
washThe resulting organic layer was washed with an aqueous sodium chloride solution
dry with materialdried over anhydrous magnesium sulfate
distillationThe resulting solution was subjected to vacuum distillation
customto remove the solvent

Sources & evidence

ORD record: ord-df0ee044718a4688ad80bc2a37448b5c
Source dataset: uspto-grants-2007_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07238689B2

Reaction notes

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