反应详情

4-Hydroxy-6-methyl-2H-pyran-2-one (11.1 g, 88.0 mmol) was suspended into ethanol (5.0 mL), added with 28% aqueous ammonia (55 mL), and the resultant mixture was stirred at 100° C. for 1 hour. The reaction solution was cooled down to room temperature, added with chloroform (25 mL) and ether (25 mL) to extract solid substance which was then washed sequentially with chloroform (10 mL), ether (10 mL) and tetrahydrofuran (30 mL), and concentrated in vacuo. Then, the obtained residue was further washed sequentially with chloroform (10 mL), ether (10 mL) and tetrahydrofuran (30 mL). 4-Hydroxy-6-methylpyridin-2(1H)-one (9.70 g, yield 88%) was obtained as a pale yellow crystal.

1. extractionto extract solid substance which
2. washwas then washed sequentially with chloroform (10 mL), ether (10 mL) and tetrahydrofuran (30 mL)
3. concentrationconcentrated in vacuo
4. washThen, the obtained residue was further washed sequentially with chloroform (10 mL), ether (10 mL) and tetrahydrofuran (30 mL)