Potassium → 3-(4-Pyridyl)-2-(4-fluorophenyl)indole

Participants

Reaction Conditions

Reaction Steps

Graphite (272 mg, 3.63 mmol) and potassium (100 mg, 0.33 mmol) were warmed to 150° C. under argon in a 250 mL round bottom flask with stirring for 25 min. THF (30 mL) was added via syringe to the hot bronze colored solid followed by a suspension of titanium (III) chloride (254 mg, 1.65 mmol) in THF (20 mL). The resultant black solution was allowed-to reflux for 1 h. 4-(2-(4-fluoro-N-benzoylamino)benzoyl)pyridine (14) (100 mg, 0.33 mmol) and THF (20 mL) were then added to the hot (65° C.) reaction mixture over 5 min. After 1 h at 65° C., the reaction was cooled to 23° C. the filtered through a silica gel pad (20 g). After concentration in vacuo, the residue was purified by flash chromatography (ethyl acetate:methylene chloride 1:1) to afford 3-(4-pyridyl)-2-(4-fluorophenyl)indole (3): Mass spectrum (CI) 289 (MH+).

Provenance & Evidence