3,5-Dichlorobenzenesulfonyl chloride → 4-(4-benzyl-piperazin-1-yl)-1-(3,5-dichloro-benzenesulfonyl)-1H-indole

Participants

Reaction Steps

4-(4-Benzyl-piperazin-1-yl)-1H-indole (274 mg, 0.94 mmole) and 50 mg tetra-n-butylammonium hydrogen sulfate was stirred in a mixture of 10 mL toluene and 5 mL 4 N sodium hydroxide. Solid 3,5-dichlorobenzenesulfonyl chloride (246 mg, 1.0 mmole) was added in one portion. The reaction mixture was stirred at room temperature for 6 hours, then it was diluted with 20 mL water and extracted with 25 mL ethyl acetate. The organic phase was washed with 10 mL saturated sodium chloride solution, dried (magnesium sulfate) and concentrated. Recrystallization from dichloromethane provided 473 mg of 4-(4-benzyl-piperazin-1-yl)-1-(3,5-dichloro-benzenesulfonyl)-1H-indole, m.p. 201-203° C.

Provenance & Evidence