[CH2:1]([N:3]1[CH2:8][CH2:7][N:6]([CH2:9][C:10]([O:12]CC)=[O:11])[CH2:5][CH2:4]1)[CH3:2]>Cl>[CH2:1]([N:3]1[CH2:8][CH2:7][N:6]([CH2:9][C:10]([OH:12])=[O:11])[CH2:5][CH2:4]1)[CH3:2]The solution of ethyl 2-(4-ethylpiperazin-1-yl)acetate (1.3 g, 6.50 mmol, 1.0 eq) in 8 N HCl stirred at 95° C. for 16 h. The mixture was concentrated on vacuum pump, and quenched and extracted as in Intermediate Example 15(b). The solvent was distilled off to afford the product in 54.5% yield (0.6 g).
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