Dimethylformamide dimethyl acetal → Ethyl 3-[(4-bromo-2-methylphenyl)amino]-2-(dimethylaminomethylene)-3-oxopropanoate

HRID 893216Notes

Reaction equation

HRID 893216 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([NH:8][C:9](=[O:16])[CH2:10][C:11]([O:13][CH2:14][CH3:15])=[O:12])=[C:4]([CH3:17])[CH:3]=1.CO[CH:20](OC)[N:21]([CH3:23])[CH3:22]>C1CCCCC1>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([NH:8][C:9](=[O:16])[C:10](=[CH:20][N:21]([CH3:23])[CH3:22])[C:11]([O:13][CH2:14][CH3:15])=[O:12])=[C:4]([CH3:17])[CH:3]=1

Participants

4

Reactant 2

HCID 78373Dimethylformamide dimethyl acetalHCID 14150214Ethyl 3-[(4-bromo-2-methylphenyl)amino]-3-oxopropanoate

Product 1

HCID 67847700Ethyl 3-[(4-bromo-2-methylphenyl)amino]-2-(dimethylaminomethylene)-3-oxopropanoateYield 50%

Reagents, catalysts & solvents 1

HCID 8078CyclohexaneSolvent

Procedure

A mixture of 21.12 grams (0.07 mole) of ethyl 3-[(4-bromo-2-methylphenyl)amino]-3-oxopropanoate, 12.58 grams (0.11 mole) of N,N-dimethylformamide dimethyl acetal and 900 milliliters of cyclohexane was heated under reflux for a period of thirty two minutes at which time TLC indicated the reaction to be incomplete. Another 12.58-gram (0.11 mole) portion of the acetal was then added and the reaction mixture stirred overnight at ambient temperature. Solvent was stripped from the mixture under reduced pressure and the resulting solid then crystallized from hexane-ethyl acetate (10:1) to give 12.6 grams (0.035 mole) of ethyl 3-[(4-bromo-2-methylphenyl)amino]-2-(dimethylaminomethylene)-3-oxopropanoate having a melting point of 88° C.-90° C.

Workup

  1. temperaturewas heated
  2. temperatureunder reflux for a period of thirty two minutes at which time TLC
  3. customthe reaction
  4. customthe resulting solid then crystallized from hexane-ethyl acetate (10:1)

Sources & evidence

ORD record
ord-1692d6b9cf324def87348802461d47af
Source dataset
uspto-grants-1992_06
Patent number
US05123951

Reaction notes

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