4-Piperidinecarboxylic acid → 1-Acetylpiperidine-4-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

Isonipecotic acid (129.2 g, 1.00 mol) was dissolved in water (390 mL), and acetic anhydride (153.1 g, 1.50 mol) was added dropwise under ice-cooling for about 10 min. (dropwise addition at 15–18° C. for about 10 min.). After stirring at 55±5° C. for 2 hrs., the mixture was allowed to cool to room temperature and stirred under ice-cooling for 1 hr. The precipitated crystals were collected by filtration, washed with cold diisopropyl ether (125 mL×2) and dried under reduced pressure at 40° C. for 8 hrs. to give the title compound (129.1 g, yield 75.4%).

Provenance & Evidence