Oxalic Acid → HCID 20311714, compound

Participants

Reaction Steps

A few drops of ethyl bromide are added to a stirring suspension, under nitrogen, of 3.2 g of magnesium turnings in 10 ml of tetrahydrofuran. After a reaction begins, 17.7 g of N-methyl-4-chloropiperidine in 50 ml of tetrahydrofuran are added dropwise while maintaining a moderate reflux. After total addition, the reaction mixture is heated at reflux for 1 hour and 15.2 g of 3-tolyinitrile in 10 ml of tetrahydrofuran are slowly added. After this addition is complete the reaction mixture is heated at reflux for an additional 2 hours and then permitted to stir at ambient temperature for 16 hours. The reaction mixture is poured into a solution of 35 g of ammonium chloride in 500 ml of ice-water and heated on a steam bath for 3 hours, cooled and extracted with benzene. The combined benzene extracts are dried and most of the benzene is removed, leaving an orange oil. The oil is dissolved in ether and the oxalate salt is prepared by the addition of a solution of anhydrous oxalic acid in isopropanol. The white oxalate salt is recrystallized twice from ethanol to give the product, mp 183°-185° C., 1-methyl-4-(3-toluyl)piperidine oxalate.

Provenance & Evidence