Cesium carbonate → Methyl 4-(4-chloro-2-fluorophenyl)nicotinate

Participants

Reaction Steps

To a stirred solution of methyl 4-chloronicotinate (7 g, 40.8 mmol), (4-chloro-2-fluorophenyl)boronic acid (7.11 g, 40.8 mmol) and cesium carbonate (26.6 g, 82 mmol) in a mixture of dioxane (60 mL) and water (8 mL) purged with nitrogen gas for 5 min, was added Pd(PPh3)4 (2.83 g, 2.448 mmol) and the resultant mixture was heated at 85° C. for 15 h. Water (30 mL) was added and the mixture was extracted with EtOAc (1×50 mL). The organic layer was washed with water (1×30 mL) and brine (1×30 mL), dried over sodium sulfate and concentrated under reduced pressure. The residue was purified via silica gel column (30% EtOAc in hexane) to give methyl 4-(4-chloro-2-fluorophenyl)nicotinate (5 g, 18.82 mmol, 40% yield). LCMS (ESI) m/e 266.7 [(M+H)+, calcd for C13H10ClFNO2 266.0]; LCMS retention time (Method C): tR=1.73 min.

Provenance & Evidence