反应详情

To a solution of 7-methoxycarbonyl-2-methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine (prepared in Preparation 1) (1.00 g) in dimethylformamide (5 ml) were added 60% sodium hydride (in oil) (0.22 g) and ethyl iodide (0.78 g) and the mixture was stirred at room temperature for 3 hours. Water was added to the reaction solution and extraction with ethyl acetate was conducted. The solvent was distilled off under reduced pressure to give 4-ethyl-7-methoxycarbonyl-2-methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazine (0.89 g).

1. distillationThe solvent was distilled off under reduced pressure