反应详情

Oxindole (0.1332 g, 1 mmol) and acetophenone (1.4 ml, 1.2 mmol) were mixed in toluene; then pyrrolidine (0.17 ml, 2 mmol) was added. The mixture refluxed for 3 hand monitored by TLC. When the reaction was finished the solvent was removed under reduced pressure. The residue was separated by flash chromatography column (gradient elution, 10-25% ethyl acetate in petroleum ether) to give 3-(1-phenyl-ethylidene)-1,3-dihydro-indol-2-one as yellow powder (200 mg, 85%). 1H NMR (400 MHz, DMSO-d6) δ ppm 2.70 (s, 3H) 5.96 (d, J=7.83 Hz, 1H) 6.51-6.57 (m, 1H) 6.77 (d, J=7.58 Hz, 1H) 7.00-7.10 (m, 1H) 7.30-7.37 (m, 2H) 7.44-7.58 (m, 3H) 10.54 (br. s., 1H). MS calcd. for C16H13NO 235, obsd. (ESI+) [(M+H)+] 236.

1. temperatureThe mixture refluxed for 3 hand
2. customwas removed under reduced pressure
3. customThe residue was separated by flash chromatography column (gradient elution, 10-25% ethyl acetate in petroleum ether)