Formaldehyde → HCID 118431255, compound

Participants

Reaction Steps

To a solution of (2R,4R)-4-methylpiperidine-2-carboxylic acid (2 g, 13.97 mmol) in MeOH (40 mL) and water (40.0 mL) was added paraformaldehyde (2.52 g, 27.94 mmol) and Pd/C (10%) (0.8 g, 7.52 mmol). The reaction mixture was stirred under a hydrogen atmosphere at room temperature overnight. From TLC, the reaction was not completed. Another one equivalent of paraformaldehyde (2.52 g, 27.94 mmol) was added and the reaction mixture was stirred another 24 hours. TLC indicated the reaction was completed and reaction mixture was filtered, washed the catalyst with MeOH (2×30 mL). The filtrate was concentrated in vacuo to give crude product as a white solid, which was washed with ether (3×30 mL), dried in high vacuum overnight to yield (2R,4R)-1,4-dimethylpiperidine-2-carboxylic acid (1) (1.870 g, 85%) as a white solid. LC-MS: 158 (M+1); 1H NMR (400 MHz, D2O) δ ppm 0.97 (d, J=5.52 Hz, 3H), 1.54 (br. s, 1H), 1.71-1.87 (m, 3H), 1.91-2.07 (m, 1H), 2.84 (s, 3H), 3.13 (td, J=8.41, 3.76 Hz, 1H), 3.35 (m, 1H), 3.65 (m, 1H).

Provenance & Evidence