[ClH:1].C([O:9][N:10]1[CH2:15][CH2:14][CH2:13][CH2:12][C:11]1=[NH:16])C1C=CC=CC=1>CO.[Pd]>[ClH:1].[NH:16]=[C:11]1[CH2:12][CH2:13][CH2:14][CH2:15][N:10]1[OH:9]A solution of 1-(benzyloxy)piperidin-2-imine hydrochloride in methanol, containing palladium on charcoal (10%, w/w) was stirred under hydrogen at atmospheric pressure for 3 h. The catalyst was filtered off and the solution was concentrated to dryness under reduced pressure. The residue was triturated with diethyl ether, filtered and dried under high vacuum to afford 2-iminopiperidin-1-ol hydrochloride as a pale yellow solid.
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