[C:1]([N:5]1[CH2:10][CH2:9][C:8](=[N:11][NH:12][C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:7][CH2:6]1)([CH3:4])([CH3:3])[CH3:2].CC(C[AlH]CC(C)C)C.CO.O>C1COCC1>[C:1]([N:5]1[CH2:6][CH2:7][CH:8]([NH:11][NH:12][C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:9][CH2:10]1)([CH3:4])([CH3:3])[CH3:2]To a solution of tert-butyl 2-(1-tert-butylpiperidin-4-ylidene)hydrazinecarboxylate (400 mg, 1.49 mmol) in THF (40 mL) was added DIBAl-H (15 mL, 15 mmol) under nitrogen atmosphere. The resulting mixture was stirred at 25° C. overnight. Methanol (5 mL) was added at −78° C. After being stirred at room temperature for 1 h, water (10 mL) was added. The solid was filtered off and washed with EtOAc. The combined filtrate was partitioned and extracted with EtOAc (3×50 mL), dried over Na2SO4, and concentrated. The residue was purified by silica gel chromatography eluting with EtOAc/petroleum ether (1:10) to give tert-butyl 2-(1-tert-butylpiperidin-4-yl)hydrazinecarboxylate (350 mg, 87% yield) as colorless oil. LCMS (ESI) m/z: 272.4 [M+H+].
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