反应详情

To a solution of methyl 2-cyano-2-ethoxyiminoacetate (syn isomer) (4.7 g) in methanol (50 ml) was added 1 N methanolic solution (5 ml) of sodium methoxide under cooling in an ice-bath and stirring, which was continued for 20 minutes in an ice-bath and 15 minutes at room temperature. The mixture was neutralized to the end point of phenolphthalein with 1 N methanolic solution of acetic acid and evaporated. The residue was dissolved in methylene chloride (80 ml), washed with water, dried over magnesium sulfate and evaporated to give methyl 3-imino-3-methoxy-2-ethoxyiminopropionate (syn isomer) (4.8 g) as an oil.

1. temperatureunder cooling in an ice-bath
2. customevaporated
3. dissolutionThe residue was dissolved in methylene chloride (80 ml)
4. washwashed with water
5. dry with materialdried over magnesium sulfate
6. customevaporated