To 0.115 g (0.40 mmol) of 1-benzyl-5-chloro-3-methylcinnolin-4(1H)-one, 0.12 g (0.81 mmol) of cesium fluoride and 0.093 g (0.08 mmol) of tetrakis(triphenylphosphine)palladium(0) was added 4 mL of dimethoxyethane. The dark brown mixture was stirred at room temperature for 15 min. then 0.079 g (0.53 mmol) of 2,4-dimethylphenylboronic acid was added. This mixture was then heated to reflux for 5 h, cooled to room temperature, diluted with ethyl acetate and filtered through a plug of silica gel. The resulting filtrate was concentrated and the residue was purified by flash chromatography eluting with a 17% ethyl acetate/hexanes mixture to give 0.102 g (71%) of the title compound as a light yellow solid.
