[Br:1][C:2]1[CH:3]=[C:4]([CH:7]=[CH:8][CH:9]=1)[CH2:5]Br.[C:10]([N:17]1[CH2:22][CH2:21][NH:20][CH2:19][CH2:18]1)([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11].C(N(CC)CC)C.C(=O)(O)[O-].[Na+]>C(#N)C>[Br:1][C:2]1[CH:3]=[C:4]([CH2:5][N:20]2[CH2:19][CH2:18][N:17]([C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])[CH2:22][CH2:21]2)[CH:7]=[CH:8][CH:9]=1
A solution of 3-bromobenzyl bromide (6 g) and Boc-piperazine (4.06 g) in acetonitrile (30 mL) was treated with triethylamine (3.36 mL). The resulting mixture was heated at reflux for 16 hours. After cooling to room temperature, the reaction mixture was treated with saturated sodium bicarbonate solution (20 mL), and then extracted with ethyl acetate (2×30 mL). The organic phases were combined, dried (MgSO4) and concentrated under vacuum. The residue was purified by chromatography on silica (100 g) eluting with ethyl acetate/cyclohexane to give the title compound (6.95 g). LC/MS: m/z, 355, 357 (M+H), 2.40 min.
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