反应详情

温度

50 °C

To a solution of methyl 5-((4-bromo-2-formylphenyl)(4-methoxybenzyl)amino)pentanoate (45.7 g) in dimethyl carbonate (900 ml) was added a methanol solution of sodium methoxide (28%, 26.4 g) and then the mixture was stirred at 50° C. under nitrogen atmosphere for 6 hours. The resultant was cooled to 0° C., followed by addition of water, neutralized with 1N hydrochloric acid, and extracted with ethyl acetate. The organic layer was washed with saturated brine, and dried with magnesium sulfate. The solvent was distilled off under reduced pressure, and the resulting residue was recrystallized from hexane-ethyl acetate to give methyl 8-bromo-1-(4-methoxybenzyl)-1,2,3,4-terahydro-1-benzoazocine-5-carboxylate (32.2 g) as yellow crystals.

1. temperatureThe resultant was cooled to 0° C.
2. extractionextracted with ethyl acetate
3. washThe organic layer was washed with saturated brine
4. dry with materialdried with magnesium sulfate
5. distillationThe solvent was distilled off under reduced pressure
6. customthe resulting residue was recrystallized from hexane-ethyl acetate