HCID 13192226, compound → HCID 13192228, compound

Participants

Reaction Steps

16.0 g (0.04 mol) of trans-3-acetoxy-4-(3,4-dimethyl-phenoxy)-1-carbobenzyloxy-piperidine are dissolved in 400 ml of methanol and hydrogenated in the presence of 1.5 g of a 5% strength palladium-on-charcoal catalyst under normal pressure. After the reaction has ended, the catalyst is filtered off by means of a layer of diatomaceous earth and the filtrate is evaporated under a water pump vacuum, whereupon trans-3-acetoxy-4-(3,4-dimethylphenoxy)-piperidine is obtained in the form of a yellow oil. Reaction of the base with fumaric acid in ethanol/ether gives the crystalline acid fumarate with a melting point of 170°-172°.

Provenance & Evidence