Diethyl Ether → 1-(3,5-Dichlorophenyl)-1,3-dihydro-indol-2-one

Participants

Reaction Steps

To a solution of 7.8 g (29.9 mmol) of 1-(3,5-Dichlorophenyl)-1H-indole in 50 mL of acetic acid was added 4.0 g (30.1 mmol) of N-chlorosuccinimide. The mixture was warmed at reflux for 1hr, when TLC indicated the disappearance of starting material. The mixture was cooled and diluted with 16 mL of 70% aqueous phosphoric acid and 4 mL of water and warmed at reflux for 6 hr. The reaction was then cooled to afford a precipitate which was diluted with 50 mL of water and collected by filtration. The solid was partially dried by pulling vacuum through the filter cake and then dissolved in dichloromethane, dried (MgSO4), treated with carbon (Norit A), filtered through diatomaceous earth and concentrated to afford an orange solid. Trituration with ether gave 5.9 g (71%) of 1-(3,5-dichlorophenyl)-1,3-dihydro-indol-2-one which was used without further purification.

Provenance & Evidence