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:25][CH2:26][S:27](Cl)(=[O:29])=[O:28]>ClCCl>[Cl:25][CH2:26][S:27]([N:12]1[CH2:13][CH2:14][N:9]([CH2:8][C:7]2[CH:6]=[CH:5][C:4]([C:2]#[N:3])=[CH:17][CH:16]=2)[C:10](=[O:15])[CH2:11]1)(=[O:29])=[O:28]To a solution of 1-(4-cyanobenzyl)-2-piperazinone hydrochloride (3.78 g) and triethylamine (6.27 ml) in dichloromethane (50 ml) was added a solution of chloromethanesulfonyl chloride (2.68 g) in dichloromethane (10 ml) at 0° C., and the mixture was stirred at 0° C. for 1 hour. 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 (hexane:ethyl acetate=1:2) to give colorless crystals of 4-chloromethylsulfonyl-1-(4-cyanobenzyl)-2-piperazinone (4.01 g).
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