Hydrochloric Acid → 3-(2-Benzofuran-1(3H)-ylidene)-5-methoxy-1,3-dihydro-2H-indol-2-one

Participants

Reaction Steps

To a stirred solution of 5-methoxyoxindole (100 mg, 0.61 mmol) in anhydrous THF (5 ml) under nitrogen was added 1.0M LiHMDS/THF solution (1.3 ml, 1.3 mmol). The mixture was stirred at room temperature for 10 minutes, and phthalide (74 mg, 0.55 mmol) was added. The mixture was stirred at room temperature for 5 hours and was then poured into a mixture of THF (10 ml) and 2M HCl (10 ml). The mixture was heated at 45° C. for 30 minutes, cooled to room temperature, and poured into water (125 ml). The resulting solid was separated, washed with water and dried under vacuum to give 3-(3H-Isobenzofuran-1-ylidene)-5-methoxy-1,3-dihydro-indol-2-one (70 mg, 46%).

Provenance & Evidence