C(OC([N:8]1[CH2:13][CH2:12][C:11]([CH2:15][CH2:16][CH2:17][OH:18])([OH:14])[CH2:10][CH2:9]1)=O)(C)(C)C.[ClH:19].O1CCOCC1>>[ClH:19].[OH:18][CH2:17][CH2:16][CH2:15][C:11]1([OH:14])[CH2:10][CH2:9][NH:8][CH2:13][CH2:12]1A mixture of 1-tert-butoxycarbonyl-4-(3-hydroxypropyl)piperidin-4-ol and 4M HCl-dioxane solution was stirred at ambient temperature for 3.5 hours to yield 4-(3-hydroxypropyl)piperidin-4-ol hydrochloride.
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