F[C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[C:8](=[O:12])[NH:7][CH2:6][CH2:5]2.[C:13]([O:17][C:18]([N:20]1[CH2:25][CH2:24][NH:23][CH2:22][CH2:21]1)=[O:19])([CH3:16])([CH3:15])[CH3:14].O>CS(C)=O>[C:13]([O:17][C:18]([N:20]1[CH2:25][CH2:24][N:23]([C:2]2[CH:3]=[C:4]3[C:9](=[CH:10][CH:11]=2)[C:8](=[O:12])[NH:7][CH2:6][CH2:5]3)[CH2:22][CH2:21]1)=[O:19])([CH3:16])([CH3:14])[CH3:15]6-Fluoro-3,4-dihydro-2H-isoquinolin-1-one (0.99 g) prepared according to the method described in J. Med. Chem., Vol. 39, 4583-4591 (1996) was dissolved in dimethyl sulfoxide (2.5 ml). N-t-Butoxycarbonylpiperazine (3.4 g) was added to the solution, and the mixture was stirred at 120° C. overnight. Water was added to the reaction solution, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was then removed by distillation under the reduced pressure. The residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate=1:3) to give 6-[4-(t-butoxycarbonyl)piperazin-1-yl]-3,4-dihydro-2H-isoquinolin-1-one (0.495 g, 24.9%).
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