[C:1]1([C@@H:7]2[NH:12][CH2:11][CH2:10][N:9]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:8]2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[H-].[Na+].[CH3:22][O:23][CH2:24][CH2:25]Br.O>CN(C=O)C.C(OCC)(=O)C>[CH3:22][O:23][CH2:24][CH2:25][N:12]1[CH2:11][CH2:10][N:9]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:8][C@@H:7]1[C:1]1[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1
Under a nitrogen atmosphere, to a solution of 330 mg of tert-butyl (3S)-3-phenylpiperazine-1-carboxylate in 3.5 mL of DMF was added 75.4 mg of sodium hydride (including 40% mineral oil) under ice-cooling, followed by stirring for 30 minutes. To the mixture was added 0.27 mL of 2-bromoethyl methyl ether, followed by stirring at room temperature for 16 hours. To the mixture were added 75.4 mg of sodium hydride (including 40% mineral oil) and 0.6 mL of 2-bromoethyl methyl ether, followed by further stirring for 8 hours. The mixture was poured into a mixture of water and ethyl acetate, and the aqueous layer was separated. The organic layer was washed with saturated brine and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography (chloroform/methanol) to obtain 330 mg of tert-butyl (3S)-4-(2-methoxyethyl)-3-phenylpiperazine-1-carboxylate.
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