反应详情

温度

90 °C

1-(4-Methyl-benzyl)-1H-pyrazole-4-carboxylic acid (0.618 g, 2.86 mmol), which had been prepared according to the protocol described for intermediate (6e), in Example 21, was stirred in toluene (20 mL) at RT and thionyl chloride (681 mg, 0.42 mL, 5.72 mmol) was added. The reaction mixture was slowly heated to 90° C. and heating continued for 3 hrs. After cooling the reaction was concentrated in vacuo. Toluene was added to the residue and concentrated in vacuo. This was repeated a further three times and the crude solid obtained was triturated using isohexane. The solids were separated by filtration washed with isohexane and dried in vacuo to afford 1-(4-methyl-benzyl)-1H-pyrazole-4-carbonyl chloride as a white solid, 0.67 g, quant.

1. temperatureheating
2. temperatureAfter cooling the reaction
3. concentrationwas concentrated in vacuo
4. additionToluene was added to the residue
5. concentrationconcentrated in vacuo
6. customthe crude solid obtained
7. customwas triturated
8. customThe solids were separated by filtration
9. washwashed with isohexane
10. customdried in vacuo