Ethyl bromoacetate → (4-(4-chloro-1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl)-5-fluoro-2-nitrophenoxy)acetic acid, ethyl ester

HRID 260958Notes

Reaction equation

[Cl:1][C:2]1[C:3]([C:12]2[C:17]([F:18])=[CH:16][C:15]([OH:19])=[C:14]([N+:20]([O-:22])=[O:21])[CH:13]=2)=[N:4][N:5]([CH3:11])[C:6]=1[C:7]([F:10])([F:9])[F:8].C([O-])([O-])=O.[K+].[K+].Br[CH2:30][C:31]([O:33][CH2:34][CH3:35])=[O:32]>CC(C)=O.O>[Cl:1][C:2]1[C:3]([C:12]2[C:17]([F:18])=[CH:16][C:15]([O:19][CH2:30][C:31]([O:33][CH2:34][CH3:35])=[O:32])=[C:14]([N+:20]([O-:22])=[O:21])[CH:13]=2)=[N:4][N:5]([CH3:11])[C:6]=1[C:7]([F:10])([F:8])[F:9]

Participants

Conditions

Temperature: 40 °C

Procedure

At 25° C., 6.11 g (0.018 mole) 4-(4-chloro-1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl)-5-fluoro-2-nitrophenol, 2.5 g (0.019 mole) K2CO3, and 2.0 mL (0.019 mole) ethyl bromoacetate were slurried in 100 mL acetone. The reaction mixture was stirred at 40° C. for 4 hours. The mixture was cooled, diluted with 100 mL cold water, and extracted four times with ethyl acetate. The ethyl acetate extracts were washed with brine, dried over anhydrous MgSO4, and stripped in vacuo. The residue was recrystallized from methylcyclohexane to give 7.5 g (99%) of (4-(4-chloro-1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl)-5-fluoro-2-nitrophenoxy)acetic acid, ethyl ester as a light yellow solid, mp 95°-96° C.

Workup

customAt 25° C.
temperatureThe mixture was cooled
extractionextracted four times with ethyl acetate
washThe ethyl acetate extracts were washed with brine
dry with materialdried over anhydrous MgSO4
customThe residue was recrystallized from methylcyclohexane

Sources & evidence

ORD record: ord-78ce4f6d02e84d838b9d7610ce87da38
Source dataset: uspto-grants-1996_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05530126

Reaction notes

Loading…