Hydrochloric Acid → HCID 10728418, compound

Participants

Reaction Steps

To a solution of 3-(4-hydroxy-4-phenylpiperidin-1-yl)propionitrile (3.71 g, 16.1 mmol, 1.00 equiv) in THF (15 mL) at room temperature was added borane-tetrahydrofuran complex (1.0 M in THF, 56.3 mL, 56.3 mmol, 3.50 equiv) dropwise. The mixture was stirred at reflux for 4.5 hours and then cooled to room temperature. Aqueous HCl (6 N, 85 mL) was added and the mixture was stirred at 50-70° C. for 2 hours. The mixture was basified to pH 9-10 by addition of 6 N aqueous NaOH and extracted with EtOAc (75 mL) and CH2Cl2 (3×75 mL). The combined organic solutions were dried over MgSO4 and concentrated. To a solution of the residue in CH2Cl2 (75 mL) was added HCl in Et2O (1.0 M, 38 mL, 2.3 equiv). After removal of the solvents, the residue was triturated with Et2O (185 mL). The resulting white solid was collected by filtration and washed with Et2O. Water (50 mL) was added to this solid, and the mixture was basified to pH 10-11 by addition of 1 N aqueous NaOH and extracted with CH2Cl2 (150 mL+2×75 mL). The combined CH2Cl2 solutions were dried over MgSO4 and concentrated to give 3.12 g (83%) of colorless oil, which was characterized spectroscopically.

Provenance & Evidence