反应详情

A mixture comprising 578 mg (2.27 mmol) of 4,6-dichloro-3-(2-methylphenoxy)pyridazine obtained in Example 1 (2), acetic acid (10 mL) and 0.45 g (4.6 mmol) of potassium acetate was refluxed for 5 hours. The reaction mixture was allowed to stand for cooling, and after adding 50 mL of water, the mixture was extracted with ethyl acetate. The organic layers were combined, and washed successively with water and brine. After drying over anhydrous sodium sulfate, the solvent was removed to obtain 461 mg (1.95 mmol, Yield: 85.9%) of 5-chloro-6-(2-methylphenoxy)-3-pyridazinol.

1. temperaturefor cooling
2. extractionthe mixture was extracted with ethyl acetate
3. washwashed successively with water and brine
4. dry with materialAfter drying over anhydrous sodium sulfate
5. customthe solvent was removed