Potassium Phosphate, Tribasic → 2-Methyl-8-(4-phenyl-2-pyridinyl)benzofuro[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 (5.96 g, 19.28 mmol), 2-chloro-4-phenylpyridine (4.39 g, 23.13 mmol), tris(dibenzylideneacetone)palladium(0) (0.353 g, 0.386 mmol) and 2-Dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (0.8 g, 1.951 mmol) were charged into a 500 mL 2-neck flask. Potassium phosphate tribasic (12.26 g, 57.8 mmol) was then dissolved in 45 mL of water. This solution was charged into the reaction mixture. The reaction mixture was degassed with nitrogen then was heated to reflux overnight. The reaction mixture was cooled to room temperature. The toluene layer was separated and was dried over magnesium sulfate. These organics were filtered and concentrated under vacuum. The crude product was passed through a silica gel column using 70-99% toluene/heptanes followed by 5-15% ethyl acetate/toluene. Some of the impure product fractions were columned on silica gel using 5-15% ethyl acetate/DCM. All the clean product fractions were combined yielding 2-methyl-8-(4-phenylpyridin-2-yl)benzofuro[2,3-b]pyridine (5.3 g, 15.76 mmol, 82% yield).

Provenance & Evidence