Malononitrile → 2-amino-1-(4-bromo-2,6-dimethylphenyl)-4-methyl-5-oxo-4,5-dihydro-1H-pyrrole-3-carbonitrile

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Reaction Steps

To a suspension of NaH (17.2 g) in tetrahydrofuran (500 mL) was added a solution of malononitrile (28.4 g) in tetrahydrofuran (100 mL) under ice-cooling and the mixture was stirred at room temperature for 1 hour. 2-Bromo-N-(4-bromo-2,6-dimethylphenyl)propionamide (120 g) was added and the mixture was heated at reflux for 1 hour. With ice-cooling, an ammonium chloride aqueous solution was added and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated under reduced pressure to give a solid. The solid was washed with a mixture of diisopropylether and ethyl acetate and filtered, dried to give 2-amino-1-(4-bromo-2,6-dimethylphenyl)-4-methyl-5-oxo-4,5-dihydro-1H-pyrrole-3-carbonitrile (110.1 g).

Provenance & Evidence