Ethyl 4-piperidinecarboxylate → 4-Piperidinecarboxylic acid

Participants

Reaction Steps

A mixture of ethyl isonipecotate (7.85 g, 0.05 mole, N-(2-chloroethyl)morpholine hydrochloride (9.30 g, 0.05 mole) and sodium bicarbonate (12.0 g, 0.14 mole) inEtOH (250 ml) was stirred at room temperature for two hours and at reflux temperature for three hours. The reaction mixture was filtered, concentrated and the residue extracted with Et2O. The Et2O layer was concentrated to give 13.4 g (quantitative yield) of 4-piperidinecarboxylic acid, 1-[2-(4-morpholinyl)-ethyl]-, ethyl ester, NMR (CDCl3) 4.0 (t, 2H), 3.6 (m, 4H), 3.0-2.3 (m, 13H), 2.2-1.5 (m, 4H), 1.4-1.0 (t, 3H).

Provenance & Evidence