Difemetorex

Difemetorex (INN; sold as Cleofil; also known as diphemethoxidine) is a stimulant drug of the piperidine class which was used as an appetite suppressant, but produced intolerable side effects such as insomnia which limited its clinical use. It was introduced in France by Ciba-Geigy in 1966 but is now no longer marketed.

Synthesis
Alkylation of desoxypipradrol with ethylene oxide gives difemetorex.