反应详情

To the sodium methoxide obtained by mixing sodium (1.57 g) with anhydrous methanol (45 ml), methyl N-(5-t-butyl-3-isoxazolyl)carbamate (12.88 g) is added. The resultant mixture is stirred at room temperature for 10 minutes, and the methanol is evaporated under reduced pressure. The residue is mixed with anhydrous benzene (100 ml) and dimethyl sulfate (8.61 g). The resultant mixture is stirred for 1 hour and refluxed for 1 hour. After cooling, the precipitate is filtered off. The organic layer is washed with an aqueous saturated solution of sodium bicarbonate and water in order, dried over anhydrous sodium sulfate, and the solvent is evaporated. The residue is distilled to give methyl N-methyl-N-(5-t-butyl-3-isoxazolyl)carbamate (11.45 g) as a distillate boiling at 84.0° to 87.0° C/0.55 mm Hg.

1. additionis added
2. customthe methanol is evaporated under reduced pressure
3. additionThe residue is mixed with anhydrous benzene (100 ml) and dimethyl sulfate (8.61 g)
4. temperaturerefluxed for 1 hour
5. temperatureAfter cooling
6. filtrationthe precipitate is filtered off
7. washThe organic layer is washed with an aqueous saturated solution of sodium bicarbonate and water in order
8. dry with materialdried over anhydrous sodium sulfate
9. customthe solvent is evaporated
10. distillationThe residue is distilled