反应详情

Benzylamine (751 mg, 7.02 mmol), N-methoxy-N-methyl-3-oxocyclobutanecarboxamide (423 mg, 2.70 mmol), and sodium cyanoborohydride (237 mg, 3.78 mmol) were dissolved in 25 mL of anhydrous methanol. The pH of the solution was brought to 5 by addition of acetic acid, and the reaction was stirred for 24 hours at room temperature. The pH of the solution then was brought to 8 by addition of 1 M aqueous sodium bicarbonate. The solvents were removed under reduced pressure. The crude product was partitioned between ethyl acetate (80 mL) and water (25 mL). The organic layer was washed with water and brine and dried, purified using flash column chromatography with hexanes/ethyl acetate (2:1) as an eluant to give 3-(benzylamino)-N-methoxy-N-methylcyclobutanecarboxamide (498 mg, 2.00 mmol, 75% yield) as an oil.

1. customThe solvents were removed under reduced pressure
2. customThe crude product was partitioned between ethyl acetate (80 mL) and water (25 mL)
3. washThe organic layer was washed with water and brine
4. customdried
5. custompurified