2-[1-(3-hydroxypropyl)-1H-indol-3-yl]acetamide → 3-(1-Methyl-1H-indol-4-yl)-4-[1-(3-hydroxypropyl)-1H-indol-3-yl]pyrrole-2,5-dione

Participants

Reaction Steps

Add potassium tert-butoxide (4.1 ml, 4.1 mmol, 1M in tetrahydrofuran) to a suspension of 2-[1-(3-hydroxypropyl)-1H-indol-3-yl]acetamide (0.32 g, 1.38 mmol) and (1-methyl-1H-indol-4-yl)oxoacetic acid methyl ester (0.30 g, 1.38 mmol) in dimethylformamide (10 ml). Stir the reaction at room temperature for 12 hours, quench with 1N HCl, and extract into ethyl acetate. Wash the organic extract with 5% aqueous lithium chloride and saturated aqueous sodium chloride, dry over magnesium sulfate, filter, and concentrate under reduced pressure. Chromatograph on flash silica using a gradient from neat hexanes to 100% ethyl acetate:hexane to obtain the title compound (0.3 g, 54%) as a red solid. ES(M++1)400.2 ES(M−−1)398.6.

Provenance & Evidence