p-Bromobenzenesulfonyl chloride → 4-Bromo-N-[2-chloro-5-(cis-3,5-dimethyl-1-piperazinyl)phenyl]benzenesulfonamide
Reaction equation
[CH3:1][C@H:2]1[NH:7][C@@H:6]([CH3:8])[CH2:5][N:4]([C:9]2[CH:10]=[CH:11][C:12]([Cl:16])=[C:13]([CH:15]=2)[NH2:14])[CH2:3]1.[Br:17][C:18]1[CH:23]=[CH:22][C:21]([S:24](Cl)(=[O:26])=[O:25])=[CH:20][CH:19]=1>N1C=CC=CC=1.ClCCl>[Br:17][C:18]1[CH:23]=[CH:22][C:21]([S:24]([NH:14][C:13]2[CH:15]=[C:9]([N:4]3[CH2:5][C@H:6]([CH3:8])[NH:7][C@H:2]([CH3:1])[CH2:3]3)[CH:10]=[CH:11][C:12]=2[Cl:16])(=[O:26])=[O:25])=[CH:20][CH:19]=1Participants
4
Procedure
A solution of 5-(cis-3,5-dimethyl-1-piperazinyl)-2-chloroaniline (D34) (108 mg, 0.45 mmol) in pyridine:dichloromethane (1:1, 4 ml) was treated with 4-bromobenzenesulfonyl chloride (138 mg, 0.54 mmol). The solution was stirred at room temperature for 2 hours, quenched with methanol and concentrated in vacuo. The residue was applied to a SCX cartridge (Varian bond-elute, 5 g) and washed with methanol and 2M ammonia in methanol. The combined basic fractions were concentrated in vacuo and the resulting residue was purified by column chromatography (FlashMaster) (dichloromethane to 5% methanol:dichloromethane) to afford some pure product. The impure fractions were purified further by MDAP, and combined with the above pure product to afford the title product (D35). MS (ES+) m/e 458/460/462 [M+H]+.