1-(Naphthalen-2-yl)-2-(piperidin-1-yl)ethane-1,2-dione is an intermediate for the synthesis of (±)-threo-Ethylnaphthidate Hydrochloride (T433447), which is the threo-form of Ethylnaphthidate (Hydrochloride) (CAS: 2170529-69-6) which is a neuroenhancing phenidate analog.