[N:1]1([CH2:7][CH2:8][OH:9])[CH2:6][CH2:5][NH:4][CH2:3][CH2:2]1.[N+:10]([C:13]1[CH:18]=[CH:17][C:16]([S:19](Cl)(=[O:21])=[O:20])=[CH:15][CH:14]=1)([O-:12])=[O:11].C(N(CC)CC)C>ClCCl>[N+:10]([C:13]1[CH:14]=[CH:15][C:16]([S:19]([N:4]2[CH2:5][CH2:6][N:1]([CH2:7][CH2:8][OH:9])[CH2:2][CH2:3]2)(=[O:21])=[O:20])=[CH:17][CH:18]=1)([O-:12])=[O:11]To a solution of 415 μL (3.38 mmol) of 1-piperazineethanol in 20 mL of dichloromethane were added 500 mg (2.26 mmol) of 4-nitrobenzenesulfonyl chloride and 472 μL (3.38 mmol) of triethylamine under ice cooling, and the mixture was stirred for 30 minutes at the same temperature. The reaction mixture was diluted with dichloromethane and the organic layer was washed with water, saturated sodium bicarbonate aqueous solution and saturated saline solution and then, dried over with anhydrous sodium sulfate. The solvent was removed under reduced pressure and the residue was purified by silica gel column chromatography (eluent:dichloromethane/methanol=30/1) to give 670 mg (94%) of the title compound.
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