Hydrochloric Acid → 4-Piperidinecarboxylic acid, methyl ester, hydrochloride (1:1)

Isonipecotic acid (40 g, 310 mmol) was suspended, with stirring, in 250 mL of dry methanol and treated with HCl gas (lecture bottle) until solution was obtained. The solution was then cooled in an ice bath and treatment with HCl gas continued for an additional 20 min. After 2.5 h, the reacion mixture was stripped of solvent using a water aspirator (30° C.) and the resulting heavy, white cake suspended in 150 mL dry THF and filtered. The filter cake was washed with two portions of 50 mL THF, followed by washing with 3×50 ml Et2O, dried briefly in air (suction). The pale-yellow filtrate was discarded. Drying the slightly off-white solid was completed over-night in a desiccator (CaSO4) under high vacuum. The title compound (43.25 g) was obtaind analytically pure. Anal. (C7H14ClNO2) calcd: C, 46.80; H, 7.86; N, 7.80; Cl, 19.73. found C, 46.66; H, 7.78; N, 19.82. TLC Rf=0.63 (silica gel, 3:1 ethanol/conc. aq. ammonium hydroxide).

1. customwas obtained
2. temperatureThe solution was then cooled in an ice bath
3. customaspirator (30° C.)
4. filtrationfiltered
5. washThe filter cake was washed with two portions of 50 mL THF
6. washby washing with 3×50 ml Et2O
7. customdried briefly in air (suction)
8. customDrying the slightly off-white solid
9. waitwas completed over-night in a desiccator

ORD record

ord-632f0a84ed7d4e689ab8320f716c77d6

Source dataset

uspto-grants-2000_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06069143