Cl.[C:2]([C:4]1[CH:17]=[CH:16][C:7]([CH2:8][N:9]2[CH2:14][CH2:13][NH:12][CH2:11][C:10]2=[O:15])=[CH:6][CH:5]=1)#[N:3].C(N(CC)CC)C.Cl[CH2:26][CH2:27][S:28](Cl)(=[O:30])=[O:29]>ClCCl>[C:2]([C:4]1[CH:5]=[CH:6][C:7]([CH2:8][N:9]2[CH2:14][CH2:13][N:12]([S:28]([CH:27]=[CH2:26])(=[O:30])=[O:29])[CH2:11][C:10]2=[O:15])=[CH:16][CH:17]=1)#[N:3]To a solution of 1-(4-cyanobenzyl)-2-piperazinone hydrochloride (3.85 g) and triethylamine (12.5 ml) in dichloromethane (50 ml) was added dropwise a solution of 2-chloroethanesulfonyl chloride (4.08 g) in dichloromethane (10 ml) at 0° C., and the mixture was stirred at 0° C. for 4 hours. The reaction solution was diluted with dichloromethane, washed with sodium bicarbonate solution and saturated brine, dried (MgSO4) and concentrated, and the residue was purified with silica gel column chromatography (ethyl acetate) to give colorless crystals of 1-(4-cyanobenzyl)-4-vinylsulfonyl-2-piperazinone (3.15 g).
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