Reaction #10030

Reaction equation

N-methylformanilide

butyl vinyl ether

bis-trichloromethylcarbonate

sodium hydroxide

→

pure compound

Yield 69.0%

N-methyl-N-phenylaminoacrolein

Yield 69.0%

Solvents

Water

clorobenzene

clorobenzene

Conditions

Workup

1. 1
   Temperaturethe mixture is cooled at about 5–10° C.
2. 2
   OtherAfter separation of the phases
3. 3
   Extractionthe aqueous layer is extracted with chlorobenzene (50 ml)
4. 4
   Washthe combined organic layers are washed with water (20 ml)
5. 5
   Otherevaporated under reduced pressure
6. 6
   workup.ADDITIONTo the residue tert-butyl methyl ether (50 ml) is added
7. 7
   Temperaturethe mixture is cooled at −15° C. for 1 hour
8. 8
   FiltrationThe precipitate is filtered on Buchner
9. 9
   Washwashed twice with tert-butyl methyl ether (25 ml×2)
10. 10
    Otherdried at 30–35° C. under vacuum overnight

Procedure

To a solution of N-methylformanilide (30 g), butyl vinyl ether (22.2 g) in 25 ml of clorobenzene under stirring at 10° C., a solution of bis-trichloromethylcarbonate (24.3 g) in 50 ml of clorobenzene is added dropwise in 2 hours. The reaction mixture is kept under stirring at room temperature overnight. Water (50 ml) is added, the mixture is cooled at about 5–10° C. and the pH is corrected to about 7 by adding sodium hydroxide 30% aqueous solution (50 ml). After separation of the phases, the aqueous layer is extracted with chlorobenzene (50 ml) and the combined organic layers are washed with water (20 ml) and evaporated under reduced pressure. To the residue tert-butyl methyl ether (50 ml) is added and the mixture is cooled at −15° C. for 1 hour. The precipitate is filtered on Buchner, washed twice with tert-butyl methyl ether (25 ml×2) and dried at 30–35° C. under vacuum overnight. 24.66 g of pure compound are obtained (69% molar yield)

Source