Chlorosuccinimide → 4-Chloro-1-difluoromethyl-1H-pyrazole-3-carboxylic acid methyl ester

HRID 2409212Notes

Reaction equation

[CH3:1][O:2][C:3]([C:5]1[CH:9]=[CH:8][N:7]([CH:10]([F:12])[F:11])[N:6]=1)=[O:4].[Cl:13]N1C(=O)CCC1=O>CN(C=O)C>[CH3:1][O:2][C:3]([C:5]1[C:9]([Cl:13])=[CH:8][N:7]([CH:10]([F:12])[F:11])[N:6]=1)=[O:4]

Participants

Conditions

Temperature: 50 °C

Procedure

A mixture of 1-difluoromethyl-1H-pyrazole-3-carboxylic acid methyl ester (535 mg, 3 mmole) and N-chloro-succinimide (1.22 g, 9.1 mmole) in DMF (5 ml) was heated at 50° C. overnight. The reaction mixture was cooled, partitioned between AcOEt and water, the organic layer was washed with water, dried, evaporated and the residue was purified by chromatography on silica gel using cyclohexane/AcOEt (3:1) to give the title compound (540 mg) as a white solid. MS: m/z=209.9 [M]+.

Workup

temperatureThe reaction mixture was cooled
custompartitioned between AcOEt and water
washthe organic layer was washed with water
customdried
customevaporated
customthe residue was purified by chromatography on silica gel

Sources & evidence

ORD record: ord-81b37e3c60a84da68af4ef7da612106d
Source dataset: uspto-grants-2014_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08815881B2

Reaction notes

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