3,3-Dimethylphthalide → HCID 58649234, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of oxindole (127 mg, 0.956 mmol) in THF (2.0 ml) cooled at 0° C. was added 1.0M LiHMDS in THF (1.91 ml). The mixture was stirred for 4 minutes at 0° C., then allowed to warm to room temperature for an additional 6 minutes. The solid 3,3-dimethyl-2-benzofuran-1(3H)-one (140 mg, 0.86 mmol) was added in one portion and the reaction rapidly stirred for 1.5 hours. The reaction was quenched into 30 ml 10% HCl aqueous solution. The resulting mixture was stirred 5 minutes, and then extracted into EtOAc. The combined organic layers were washed with water, brine, dried with anhydrous Na2SO4, and rotary evaporated to a yellow oil. The yellow oil was chromatographed through silica gel column (20% to 30% EtOAc/hexane gradient) to give (3E)-3-(3,3-dimethyl-2-benzofuran-1(3H)-ylidene)-1,3-dihydro-2H-indol-2-one as a yellow solid (99 mg, 41%).

Provenance & Evidence