[CH3:1][C:2]1([NH:9][C:10](=[O:16])[O:11][C:12]([CH3:15])([CH3:14])[CH3:13])[CH2:7][CH2:6][C:5](=O)[CH2:4][CH2:3]1.CO.C([O-])=O.[NH4+:22]>[Pd].O>[NH2:22][CH:5]1[CH2:6][CH2:7][C:2]([NH:9][C:10](=[O:16])[O:11][C:12]([CH3:15])([CH3:14])[CH3:13])([CH3:1])[CH2:3][CH2:4]1To a mixture of tert-butyl (1-methyl-4-oxocyclohexyl)carbamate (4.00 g) and methanol (50 mL), ammonium formate (10.2 g) and water (5 mL) were added and stirred for 1 hour until they were completely dissolved. Then, 10% palladium on carbon (2.0 g) was added and stirred at room temperature for 65 hours. After insoluble materials were separated by filtration through celite, the solvent was distilled off, and chloroform was added to the resulting residue, followed by drying over anhydrous magnesium sulfate. The solvent was distilled off to give tert-butyl (4-amino-1-methylcyclohexyl)carbamate (3.73 g) as a colorless syrup.
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