Potassium Phosphate, Tribasic → 8-(4-(2,3-Difluorophenyl)pyridin-2-yl)-2-methylbenzofuro[2,3-b]pyridine

Participants

Reaction Steps

2-methyl-8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzofuro[2,3-b]pyridine (2.8 g, 9.06 mmol), 2-chloro-4-(2,3-difluorophenyl)pyridine (2.452 g, 10.87 mmol), tris(dibenzylideneacetone)palladium(0) (0.166 g, 0.181 mmol) and 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (0.297 g, 0.725 mmol) were charged into the reaction mixture with 200 mL of toluene. Potassium phosphate tribasic (5.76 g, 27.2 mmol) was dissolved in 25 mL of water then was charged into the reaction mixture. This mixture was degassed then heated to reflux for 18 hours. The reaction mixture was cooled to room temperature. The toluene layer was separated and was dried over magnesium sulfate. This mixture was filtered and concentrated under vacuum. The crude residue was passed through a silica gel column using 15-22.5% ethyl acetate/heptanes. The clean product fractions were evaporated under reduced pressure yielding 8-(4-(2,3-difluorophenyl)pyridin-2-yl)-2-methylbenzofuro[2,3-b]pyridine (1.2 g, 3.22 mmol, 35.6% yield) as a white solid.

Provenance & Evidence