Potassium Carbonate → 5-Amino-4-[3-(tert-butoxycarbonylmethyloxy)benzoyl]-1-(4-fluorophenyl)pyrazole

HRID 1278873Notes

Reaction equation

[NH2:1][C:2]1[N:6]([C:7]2[CH:12]=[CH:11][C:10]([F:13])=[CH:9][CH:8]=2)[N:5]=[CH:4][C:3]=1[C:14](=[O:22])[C:15]1[CH:20]=[CH:19][CH:18]=[C:17]([OH:21])[CH:16]=1.Br[CH2:24][C:25]([O:27][C:28]([CH3:31])([CH3:30])[CH3:29])=[O:26].C(=O)([O-])[O-].[K+].[K+]>C(#N)C.C(OCC)(=O)C>[NH2:1][C:2]1[N:6]([C:7]2[CH:12]=[CH:11][C:10]([F:13])=[CH:9][CH:8]=2)[N:5]=[CH:4][C:3]=1[C:14](=[O:22])[C:15]1[CH:20]=[CH:19][CH:18]=[C:17]([O:21][CH2:24][C:25]([O:27][C:28]([CH3:31])([CH3:30])[CH3:29])=[O:26])[CH:16]=1

Participants

Conditions

Temperature: 70 °C

Procedure

A mixture of 5-amino-1-(4-fluorophenyl)-4-[3-hydroxybenzoyl]pyrazole (1.0 g, 3.3 mmol), tert-butyl bromoacetate (1.4 g, 7.2 mmol) and potassium carbonate (1 g, 7.2 mmol) in acetonitrile was heated at 70° C. overnight. The reaction mixture was cooled, diluted with ethyl acetate and filtered. The filtrate was concentrated in vacuo and the residue was purified by flash chromatography (elution gradient: 10% acetone/hexane) to give 5-amino-4-[3-(tert-butoxycarbonylmethyloxy)benzoyl]-1-(4-fluorophenyl)pyrazole (1.2 g) as a solid.

Workup

temperatureThe reaction mixture was cooled
filtrationfiltered
concentrationThe filtrate was concentrated in vacuo
customthe residue was purified by flash chromatography (elution gradient: 10% acetone/hexane)

Sources & evidence

ORD record: ord-a151ac1a97d948c2a94e208c716245ad
Source dataset: uspto-grants-2002_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06444696B1

Reaction notes

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