二甲基对苯二胺二盐酸 → 2-甲基-2H-吲唑-3-甲酸

参与物

反应步骤

To methyl 2-methylindazole-3-carboxylate (1.59 g, 8.36 mmol) were added THF (85 ml) and 0.25N NaOH (50 ml, 12.5 mmol) and the resulting mixture was stirred at room temperature for 24 hours. The reaction mixture was distilled under reduced pressure to remove the solvent. To the residue was added water, followed by the addition of 1N HCl (50 ml). The crystals thus precipitated were collected by filtration under reduced pressure, washed with water and dried under reduced pressure to give 2-methylindazole-3-carboxylic acid (1.34 g, 91%) as a colorless solid.

来源与证据