Dimethylformamide → tert-Butyl4-[5-(trifluoromethyl)pyridin-3-yl]piperazine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

Copper(I) iodide (0.49 g, 2.6 mmol) and potassium fluoride (0.15 g, 2.6 mmol) in a flask were flame-heated under gentle shaking and at high vacuum until a greenish color appeared. A solution of tert-butyl 4-(3-iodophenyl)piperazine-1-carboxylate (0.5 g, 1.0 mmol) and (trifluoromethyl)trimethylsilane (0.37 g, 2.6 mmol) in DMF (5 mL) was added. The brown solution was stirred at room temperature overnight. More (trifluoromethyl)trimethylsilane (0.37 g) was added. The mixture was heated at 50° C. overnight, diluted with EtOAc and washed with saturated ammonium chloride. The aqueous layer was extracted with EtOAc three times. The combined organic layers were dried (MgSO4), concentrated and purified by flash chromatography on silica gel (20% to 40% EtOAc/hexanes) to give 120 mg of desired product. MS calculated for C15H20F3N3O2: (M+H) 332; found 332.1.

Provenance & Evidence