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A stirred slurry of 842 mg (4.0 mmole) of 5-chloro-2-oxindole-1-carboxamide and 1.08 g (8.8 mmole) of 4-(N,N-dimethylamino)pyridine in 15 ml of N,N-dimethylformamide was cooled to ice-bath temperature, and then a solution of 449 mg (4.4 mmole) of acetic anhydride in 5 ml of N,N-dimethylformamide was added dropwise. Stirring was continued for ca. 30 minutes, and then the reaction mixture was poured into a mixture of 75 ml of water and 3 ml of 3N hydrochloric acid. The resulting mixture was cooled in an ice-bath and the solid was recovered by filtration. The solid was recrystallized from acetic acid to give 600 mg of fluffy, pale pink crystals, m.p. 237.5° C. (dec.).

1. temperatureThe resulting mixture was cooled in an ice-bath
2. filtrationthe solid was recovered by filtration
3. customThe solid was recrystallized from acetic acid
4. customto give 600 mg of fluffy, pale pink crystals, m.p. 237.5° C. (dec.)