1-Piperidinecarboxaldehyde → HCID 15132179, compound

Participants

Reaction Conditions

Reaction Steps

1.2 g of Mg (magnesium shavings) in 15 ml of absolute tetrahydrofuran are initially introduced under a nitrogen atomsphere. A few drops of dibromomethane are added at 65° C. A solution of 14.25 g of 3-bromo-2-methylbenzyl tetrahydro-2-pyranyl ether in 50 ml of tetrahydrofuran is added dropwise while the temperature is kept at 65° C. The refluxed mixture is then stirred for 2 hours. A solution of 5.65 g of N-formylpiperidine in 10 ml of absolute tetrahydrofuran is added dropwise to the reaction mixture after the latter has been cooled to 0° C. Stirring is carried out for 20 hours at room temperature, the mixture is rendered slightly acidic with about 50 ml of 5% strength hydrochloric acid and extraction is carried out several times with ether. The combined ether extracts are washed with water, dried and evaporated down. The crude product (11 g) can be purified by column chromatography over silica gel using 97.5:2.5 toluene/acetone.

Provenance & Evidence