1,2-Dichloro-4-fluorobenzene → 4-(3,4-Dichlorophenoxy)piperidine

Participants

Reaction Steps

4-Hydroxypiperidine (50 g) was added portionwise to a stirred suspension of potassium tert-butoxide (110.9 g) in THF (900 mL) at room temperature and under nitrogen. The mixture was heated at reflux and 1,2-dichloro-4-fluorobenzene (98 g) added dropwise over 30 min. The mixture was stirred at reflux for another 1 h then cooled down to room temperature, diluted with ethyl acetate (500 mL) and washed with water (500 mL). The organic phase was diluted further with ethyl acetate (500 mL) and extracted with 1M hydrochloric acid (200 mL). The aqueous extract was adjusted to over pH 10 by addition of a solution of sodium hydroxide and extracted twice with tert-butylmethyl ether (750 mL). The organic extracts were dried over magnesium sulfate, filtered and concentrated under vacuum to yield the sub-title compound as a dark oil which was used as such in the next step.

Provenance & Evidence