1,2-Dichloroethane → 2,3-dimethoxy-benzoic acid 1-{3-[4-(1-methyl-6-nitro-1H-indol-3-yl)-2,5-dioxo-2,5-dihydro-1H-pyrrol-3-yl]-indol-1-yl}-ethyl ester

Beteiligte Stoffe

Reaktionsschritte

To a solution of 3-[1-(1-hydroxy-ethyl)-1H-indol-3-yl]-4-(1-methyl-6-nitro-1H-indol-3-yl)-pyrrole-2,5-dione (165.3 mg, 0.678 mmol) (from step d) above), EDC.HCL (284.5 mg, 1.484 mmol), and dimethylaminopyridine (185.5 mg, 1.58 mmol) in 20 mL of CH2Cl2 was added 2,3-dimethoxybenzoic acid (287.4 mg, 0.668 mmol). The solution was stirred at room temperature for 0.5 hour, washed with saturated NaHCO3, brine, dried over magnesium sulfate, and evaporated. The residue was purified by flash chromatography using EtOAc/hexanes to give 203 mg of 2,3-dimethoxy-benzoic acid 1-{3-[4-(1-methyl-6-nitro-1H-indol-3-yl)-2,5-dioxo-2,5-dihydro-1H-pyrrol-3-yl]-indol-1-yl}-ethyl ester. (Yield 50%).

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