HCID 178470495, compound → HCID 178524954, compound
Reaction equation
C([O:3][C:4]([C:6]1[C:10]([NH:11][C:12](=[O:21])[C:13]2[C:18]([F:19])=[CH:17][CH:16]=[CH:15][C:14]=2[F:20])=[CH:9][NH:8][N:7]=1)=[O:5])C>[OH-].[Na+].CO>[F:19][C:18]1[CH:17]=[CH:16][CH:15]=[C:14]([F:20])[C:13]=1[C:12]([NH:11][C:10]1[C:6]([C:4]([OH:5])=[O:3])=[N:7][NH:8][CH:9]=1)=[O:21]Participants
3
Reactant 1
Product 1
Reagents, catalysts & solvents 1
Procedure
A mixture of 4-(2,6-difluoro-benzoylamino)-1H-pyrazole-3-carboxylic acid ethyl ester (10.2 g) in 2 M aqueous NaOH/MeOH (1:1, 250 ml) was stirred at ambient temperature for 14 h. Volatile materials were removed in vacuo, water (300 ml) added and the mixture taken to pH 5 using 1M aqueous HCl. The resultant precipitate was collected by filtration and dried through azeotrope with toluene to afford 4-(2,6-difluoro-benzoylamino)-1H-pyrazole-3-carboxylic acid as a pink solid (5.70 g). (LC/MS: Rt 2.33, [M+H]+267.96).