[H-].[Al+3].[Li+].[H-].[H-].[H-].[NH:7]1[CH2:12][CH2:11][O:10][CH:9]([CH2:13][N:14]2[CH2:19][CH2:18][N:17]([C:20](OC(C)(C)C)=O)[CH2:16][CH2:15]2)[CH2:8]1.[OH-].[Na+].C(Cl)(Cl)Cl>O1CCCC1>[CH3:20][N:17]1[CH2:16][CH2:15][N:14]([CH2:13][CH:9]2[O:10][CH2:11][CH2:12][NH:7][CH2:8]2)[CH2:19][CH2:18]1
Lithium aluminum hydride (150 mg, 4.10 mmol) was suspended in tetrahydrofuran (5 mL), and the suspension was mixed with a solution of tert-butyl 4-morpholin-2-ylmethylpiperazinecarboxylate (390 mg, 1.37 mmol) prepared as an intermediate according to Process Step 2 of Reference Example 19 in tetrahydrofuran (5 mL) added dropwise under ice-cooling, followed by heating at 60° C. under reflux for two hours. An aqueous sodium hydroxide solution (2 mol/L, 10 mL) and chloroform (50 mL) were added under ice-cooling, followed by separation. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure, to thereby yield the title compound (180 mg, in a yield of 66%).
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