4-Bromobenzoyl chloride → HCID 22709573, compound

Participants

Reaction Steps

In dichloromethane (40 ml), cis-1-[(5-chloro-1-phenylsulfonylindol-2-yl)sulfonyl]-3,5-dimethylpiperazine (1.30 g) was dissolved. To the resulting suspension, diisopropylethylamine (645 μl) was added under ice cooling, followed by the dropwise addition of a solution of 4-bromobenzoyl chloride (0.74 g) in dichloromethane (5 ml). Stirring was then effected at room temperature for 3 hours. A saturated aqueous solution of sodium bicarbonate was added to the reaction mixture. The organic layer thus separated was washed with 0.5N hydrochloric acid and saturated aqueous NaCl solution, dried over anhydrous sodium sulfate and distilled under reduced pressure to remove the solvent. The residue was purified by chromatography on a silica gel column (hexane:ethyl acetate=2:1 to 1:1), whereby the title compound (1.8 g, 97%) was obtained as a pale yellow amorphous.

Provenance & Evidence