Diisopropylethylamine → 1H-pyrrole-2-carboxylic acid [2-(5-benzenesulfonyl-1H-indazol-3-ylcarbamoyl)-5-(4-methyl-piperazin-1-yl)-phenyl]amide

Participants

Reaction Steps

2-Amino-N-(5-benzenesulfonyl-1H-indazol-3-yl)-4-(4-methyl-piperazin-1-yl)-benzamide (245 mg, 0.5 mmol) was suspended in dichloromethane (10 mL), treated first with neat N,N-diisopropylethylamine (0.35 mL, 2 mmol) then with solid 1H-pyrrole-2-carbonyl chloride (258 mg, 2 mmol). The reaction was stirred at room temperature overnight then treated with additional acid chloride (258 mg) and N,N-diisopropylethylamine (0.35 mL). After two hours the solvent was removed under reduced pressure and the crude was taken up with tetrahydrofuran (30 mL) and treated with 2N NaOH (10 mL). After stirring overnight the solvent was removed and the solid was filtered and washed thoroughly with water. The crude was purified by flash chromatography over silica gel (eluent: ethyl acetate/methanol/aq.33% NH4OH in 9:1:0.1 ratio) to give 60 mg of title compound.

Provenance & Evidence