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With hydrogenchloride; H2; sodium hydroxide; In water;
C. 1-[(Phenylmethoxy)carbonyl]-<strong>[74494-52-3]3-piperidineacetic acid</strong> Platinum oxide (300 mg, Alfa) was added to a solution of 3-pyridyl acetic acid (3.3 g, 24.08 mmol) in water (120 mL) and conc. HCl (2.5 mL). The solution was hydrogenated at up to 50 psi of H2 pressure for 6.5 hrs. The catalyst was removed by filtration through a pad of Celite and the pad was washed with more water. The stirred aqueous solution of the 3-piperidine acetic acid was cooled (0-5 C.) and treated with 5 N aqueous NaOH solution (20 mL). Benzyl chloroformate (4 mL) was added dropwise to the cooled, stirred solution. During the ten minute addition, the pH was maintained between 10 and 12 by addition of NaOH solution. After one hour the reaction mixture was extracted with ether (2*100 mL). The ether extracts were discarded and the aqueous layer was acidified with 2 N HCl solution. The acidified aqueous layer was then extracted with ethyl acetate (2*100 mL). The combined extracts were dried over magnesium sulfate and concentrated in vacuo to give title compound as an oil (7.0 g, contained EtOAc).