Hydrochloric Acid → (R)-2-chloro-5-fluoro-3-(pyrrolidin-2-yl)pyridine dihydrochloride

Participants

Reaction Steps

To a dioxane (5 mL) solution of (R)-tert-butyl 2-(2-chloro-5-fluoropyridin-3-yl)pyrrolidine-1-carboxylate (500 mg, 1.66 mmol) was added HCl (4 N dioxane, 20 mL), followed by stirring at ambient temperature overnight. The mixture was concentrated and treated with Et2O, then vacuum-dried, to provide the product as a white solid (0.36 g, 80%). MS (apci pos) m/z=201.1 (M+H). The enantiomeric excess (ee %) of the product was determined to be >92% according to the method described in Preparation A.

Provenance & Evidence