[NH:1]1[CH:5]=[CH:4][CH:3]=[N:2]1.[C:6]([OH:10])(=[O:9])[CH:7]=[CH2:8]>C(N(CC)CC)C>[N:1]1([CH2:8][CH2:7][C:6]([OH:10])=[O:9])[CH:5]=[CH:4][CH:3]=[N:2]1In a 10 mL round-bottomed flask equipped with a condenser and a stirring bar was placed pyrazole (0.50 g, 7.3 mmol), acrylic acid (0.50 mL, 7.3 mmol) and triethylamine (3 mL). The reaction mixture was refluxed for 6 hours. After removing triethylamine, the viscous oil was dried on high vacuo during 12 hours to yield quantitatively the desired acid (1.0 g) suitable for the next step without further purification.
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