[CH2:1]([O:3][C:4]([C:6]1[CH:10]=[C:9]([CH2:11][CH2:12][CH3:13])[NH:8][N:7]=1)=[O:5])[CH3:2].[O-][Cl:15].[Na+]>C(O)(=O)C>[CH2:1]([O:3][C:4]([C:6]1[C:10]([Cl:15])=[C:9]([CH2:11][CH2:12][CH3:13])[NH:8][N:7]=1)=[O:5])[CH3:2]Following protocol K, 5-propyl-1H-pyrazole-3-carboxylic acid ethyl ester was treated with glacial acetic acid and NaOCl under similar reaction conditions, yieliding the title compound.
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