Hydrochloric Acid → 5-Chloro-3-(5-dimethylamino-3H-isobenzofuran-1-ylidene)-1,3-dihydroindol-2-one

Participants

Reaction Conditions

Reaction Steps

A solution of 5-chlorooxindole (1.18 mg, 7.05 mmol) in 20 mL of DME was cooled to 0° C., and treated with 6.2 mL of 2.5M n-BuLi/hexane solution (15.5 mmol) dropwise under nitrogen. The mixture was stirred at 0° C. for 10 minutes. 5-dimethylaminophthalide (1.0 g, 5.64 mmol) was added as one portion. The mixture was allowed to warm to room temperature under nitrogen and stirring was continued for 3 hours. The cloudy mixture was then slowly added into 0.5M aqueous HCl solution (0° C.) with vigorous stirring. The resulting mixture was neutralized with 1 M NaOH solution until pH=9. The yellow precipitate which formed was collected by filtration, washed with water, dried under vacuum. The solid obtained was triturated with hot MeOH (20 mL) followed by ethyl acetate (10 mL), collected by filtration and dried to give title compound (900 mg, 49%) as a bright yellow powder.

Provenance & Evidence