Indomethacin → tert-Butyl 3-[2-{1-(4-chlorobenzoyl)-5-methoxy-2-methyl-1H-indol-3-yl}acetamido]propylcarbamate

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an Indo-Coumarinyl Analog: Compound 27gg, N-[3-{7-(N,N-Diethylamino)coumarin-3-carboxylamido}butyl]-2-{1-(4-chlorobenzoyl)-5-methoxy-2-methyl-1H-indol-3-yl}acetamide was synthesized by the method depicted in FIG. 8. Briefly, indomethacin was complexed with tert-Butyl-3-aminopropylcarbamate for 16 hours at room temperature in the presence of 1-ethyl-3-(3′-dimethylaminopropyl)carbodiimide hydrochloride (EDCl), 1-hydroxybenzotriazole (HOBt), N,N-diisopropylethylamine (DIPEA), and N,N-dimethylformamide (DMF). tert-Butyl 3-[2-{1-(4-chlorobenzoyl)-5-methoxy-2-methyl-1H-indol-3-yl}acetamido]propylcarbamate was produced as a pale yellow solid at 70% yield. This product was then dissolved in dichloromethane and treated with HCl (gas) for 2 hours at room temperature, producing N-(4-qminobutyl)-2-{1-(4-chlorobenzoyl)-5-methoxy-2-methyl-1H-indol-3-yl}acetamide hydrochloride as a brown solid with a yield of 98%, which was reacted with triethylamine (TEA) in dimethyl sulfoxide (DMSO) for 5 minutes at room temperature prior to the addition of 7-(N,N-Diethylamino)coumarin-3-carboxylic acid succinimidyl ester. The reaction proceeded for 16 hours at room temperature and produced Compound 27gg as a yellow solid (66% yield).

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