Water → 4-(Bromomethyl)-5-chloro-1-phenyl-3-(trifluoromethyl)-1H-pyrazole

HRID 1172095Notes

Reaction equation

[Cl: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[Cl:1]

Participants

Conditions

Temperature: -10 °C

Procedure

A solution of 3.0 g (10.9 mmoles) of (5-chloro-1-phenyl-3-trifluoromethyl-1H-pyrazol-4-yl)-methanol dissolved in 60 ml of diethyl ether was cooled to −10° C. Thereto was added 1.0 g (3.8 mmoles) of phosphorus tribromide. The mixture was stirred at room temperature for 1 hour to give rise to a reaction. After the completion of the reaction, the reaction mixture was poured into water, followed by extraction with ethyl acetate. 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 3.6 g (yield: 95.8%) of 4-bromomethyl-5-chloro-1-phenyl-3-trifluoromethyl-1H-pyrazole as white crystals.

Workup

customto give rise
customto a reaction
customAfter the completion of the reaction
extractionfollowed by extraction with ethyl acetate
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-f8f63eb742ef40ae8a432cc15f93a324
Source dataset: uspto-grants-2010_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07833939B2

Reaction notes

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