Water → 1-Phenylpiperidin-4-amine

1-Phenylpiperidin-4-one (3.0 g, 17.1 mmol) was dissolved in methanol (250 mL) and acetic acid (147 mL), and ammonium acetate (67 g, 870 mmol) was added portionwise. The mixture was stirred for 4 hrs at room temperature, then cooled to 0° C. (ice-water) and sodium cyanoborohydride (1.6 g, 25 mmol) was added, then the reaction mixture was stirred at room temperature for 18 hrs. Water (20 mL) was added, and the mixture was concentrated under reduced pressure. The residue was adjusted to pH 12 with 15% aqueous NaOH and the resulting mixture was extracted with dichloromethane (3×100 mL). The combined organic extracts were dried over MgSO4, filtered, and concentrated in vacuo. The residue was chromatographed on silica gel, eluting with dichloromethane—3% methanol—0.3% NH4OH to give the product as a pale solid.

1. additionwas added
2. stirringthe reaction mixture was stirred at room temperature for 18 hrs
3. concentrationthe mixture was concentrated under reduced pressure
4. extractionthe resulting mixture was extracted with dichloromethane (3×100 mL)
5. dry with materialThe combined organic extracts were dried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe residue was chromatographed on silica gel
9. washeluting with dichloromethane—3% methanol—0.3% NH4OH

ORD record

ord-735a55a8a4f848028e8ab423997d3700

Source dataset

uspto-grants-2001_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06248756B1