Bromoacetonitrile → 1-cyanomethyl-4-(4-fluorophenyl)-3-[4-(methylsulfonyl)phenyl]-5-(trifluoromethyl)-1H-pyrazole

HRID 1292229Notes

Reaction equation

[F:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[C:9]([C:17]3[CH:22]=[CH:21][C:20]([S:23]([CH3:26])(=[O:25])=[O:24])=[CH:19][CH:18]=3)=[N:10][NH:11][C:12]=2[C:13]([F:16])([F:15])[F:14])=[CH:4][CH:3]=1.Br[CH2:28][C:29]#[N:30]>C1(C)C=CC=CC=1>[C:29]([CH2:28][N:11]1[C:12]([C:13]([F:16])([F:14])[F:15])=[C:8]([C:5]2[CH:6]=[CH:7][C:2]([F:1])=[CH:3][CH:4]=2)[C:9]([C:17]2[CH:22]=[CH:21][C:20]([S:23]([CH3:26])(=[O:24])=[O:25])=[CH:19][CH:18]=2)=[N:10]1)#[N:30]

Participants

Conditions

Temperature: 190 °C

Procedure

A mixture of 4-(4-fluorophenyl)-3-[4-(methylsulfonyl)phenyl]-5-(trifluoromethyl)-1H-pyrazole (Example 1, step 3)(0.10 g), 4.2 g of bromoacetonitrile and 3 mL of toluene was heated at reflux for 2 hours. Toluene was distilled off and the mixture was heated at 190° C. for 24 hours. The reaction mixture was diluted with methylene chloride and filtered through silica gel. The filtrate was concentrated in vacuo and the residue was purified by HPLC (30% ethyl acetate-hexane). The second fraction eluted with 40% ethyl acetate-hexane yielding 1-cyanomethyl-4-(4-fluorophenyl)-3-[4-(methylsulfonyl)phenyl]-5-(trifluoromethyl)-1H-pyrazole (1 2 mg, 11%): mp 192°-194° C.

Workup

temperaturewas heated
temperatureat reflux for 2 hours
distillationToluene was distilled off
additionThe reaction mixture was diluted with methylene chloride
filtrationfiltered through silica gel
concentrationThe filtrate was concentrated in vacuo
customthe residue was purified by HPLC (30% ethyl acetate-hexane)
washThe second fraction eluted with 40% ethyl acetate-hexane

Sources & evidence

ORD record: ord-281e63f208094befa67ce7daf89ce7bb
Source dataset: uspto-grants-1998_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05756530

Reaction notes

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