反应详情

To a solution of methyl 5-[2-(tetrahydro-2H-pyran-2-yloxy)ethyl]pyrazine-2-carboxylate (1.36 g) in methanol (20 mL) was added 1 M aqueous sodium hydroxide solution (15 mL) under ice-cooling. It was stirred at room temperature for 2 hours. To the reaction mixture was added 1 M hydrochloric acid under ice-cooling to adjust the pH to 3. A saturated brine was added, followed by extraction with a solvent (chloroform:methanol=4:1). The organic layer was dried over anhydrous magnesium sulfate, filtered, and concentrated to obtain 5-[2-(tetrahydro-2H-pyran-2-yloxy)ethyl]pyrazine-2-carboxylic acid (1.50 g) as a brown oily substance.

1. temperaturecooling
2. temperaturecooling
3. extractionfollowed by extraction with a solvent (chloroform:methanol=4:1)
4. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated