[N:1]1([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH2:6][CH2:5][NH:4][CH2:3][CH:2]1[C:7]([O:9][CH3:10])=[O:8].[CH2:18](Br)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.C(N(CC)CC)C>C(#N)C>[CH2:18]([N:4]1[CH2:5][CH2:6][N:1]([C:11]([O:13][C:14]([CH3:17])([CH3:16])[CH3:15])=[O:12])[CH:2]([C:7]([O:9][CH3:10])=[O:8])[CH2:3]1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1To a dry 100 mL round bottom flask equipped with a stirring bar under N2 was added 1-tert-butyl 2-methyl piperazine-1,2-dicarboxylate (5 g, 20.5 mmol), anhydrous acetonitrile (60 mL), benzyl bromide (2.7 mL, 22.5 mmol), and triethylamine (8.5 mL, 61.5 mmol). The reaction mixture was heated at 71° C. for 45 minutes and concentrated under reduced pressure. It was then diluted with methylene chloride and washed with water and brine. The organic layer was dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude compound was purified by flash column chromato-graphy eluting with 8:1 petroleum either/ethyl acetate to afford 336a (4.5 g, 66%). MS: [M+H]+ 335. 1H NMR (500 MHz, CDCl3) δ 7.28 (m, 5H), 4.60 (m, 1H), 3.78 (m, 4H), 3.57 (m, 1H), 3.43 (m, 1H), 3.28 (m, 2H), 2.77 (m, 1H), 2.19 (m, 1H), 2.11 (m, 1H), 1.47 (s, 5H), 1.42 (s, 4H).
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