Triethylamine → (Z)-N-[3-[2,3-dihydro-2-oxo-3-[(1H-pyrrol-2-yl)methylene]-1H-indol-4-yl]phenyl]-4-(phenylsulfonyl)-2-thiophenesulfonamide

Participants

Reaction Steps

A solution of (Z)-4-(3-aminophenyl)-1,3-dihydro-3-[(1H-pyrrol-2-yl)methylene]-2H-indol-2-one (60 mg, 0.200 mmol) (from Example 4 supra), Et3N (28 μL , 0.201 mmol), and 4-benzenesulfonylthiophene-2-sulfonyl chloride (64.6 mg, 0.200 mmol) (Lancaster) in 7 mL of 1,2-dimethoxyethane (Fisher Scientific) was heated at reflux for 1 h. The reaction mixture was allowed to cool and then stirred at room temperature for 15 h. The reaction mixture was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 45% ethyl acetate-hexanes elution) provided pure (Z)-N-[3-[2,3-dihydro-2-oxo-3-[(1H-pyrrol-2-yl)methylene]-1H-indol-4-yl]phenyl]-4-(phenylsulfonyl)-2-thiophenesulfonamide (yield: 42 mg, 36%) as a yellow solid (mp 132-134° C.) (solid to gel).

Provenance & Evidence