Sulfuric Acid → HCID 13216750, compound

Participants

Reaction Steps

To a suspension of 1-methyl-4-(2-fluorophenylmethoxy)piperidine (liberated from 30.6 g, 90.7 mmole, of the oxalate, and 165 ml of water was added a solution of 22 ml of conc. sulfuric acid in 53 ml of water. To the solution was added 4.0 g (13.4 mmole) of mercuric sulfate. The mixture was heated at reflux for 1.5 hr. under nitrogen and allowed to cool to room temperature. The mixture was poured into cold saturated sodium carbonate, extracted twice with ether and washed with saturated sodium chloride. The ether solution was dried over anhydrous potassium carbonate, filtered and the solvent evaporated to provide an oil. The oxalate salt was precipitated, and recrystallization from methanol/ethanol provided 21.1 g (59.4%) of 4-(1-oxoethyl)-4-(2-fluorophenylmethoxy)-1-methylpiperidine oxalate. The material appeared pure by TLC on silica gel in methanol:methylene chloride (9:1), Rf =0.4 and on alumina in ether, Rf =0.3. IR (Nujol), NMR-DMSO-d6 and MS (ci MH+ =266) are consistent with the structure, m.p.=180°-181° C.

Provenance & Evidence