Sodium Carbonate → Methyl 3-(2-(4-fluorophenyl)-3-methylfuro[2,3-b]pyridin-5-yl)benzoate

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Reaction Steps

2,4,6-trimethyl-1,3,5,2,4,6-trioxatriborinane (0.236 mL, 1.69 mmol) was added to a stirring solution of methyl 3-(3-bromo-2-(4-fluorophenyl)furo[2,3-b]pyridin-5-yl)benzoate (360 mg, 0.845 mmol), sodium carbonate (269 mg, 2.53 mmol), Pd(Ph3P)4 (98 mg, 0.084 mmol) in DMF (10 mL) and Water (1.0 mL). It was subjected to MW irradiation (180° C.) for 30 min. The mixture was diluted with EtOAc and washed with sat NaHCO3, and sat NaCl. The organic phase was dried over Na2SO4, filtered and concentrated. The crude residue was diluted with MeOH and treated with (Diazomethyl)trimethylsilane (467 μL, 0.934 mmol) to re-esterfy the acid which had formed. It was allowed to stir for 1 hour and then concentrated and purified on silica gel (Biotage, EtOAc/hexanes gradient, fraction collection at λ=254 nm) to give the expected product methyl 3-(2-(4-fluorophenyl)-3-methylfuro[2,3-b]pyridin-5-yl)benzoate (163 mg, 0.451 mmol, 53% yield) consistent by LCMS. LC-MS retention time: 1.79 min; m/z (MH+): 362. LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a Waters XBridge 5u C18 4.6×50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM. The elution conditions employed a flow rate of 5 ml/min, a gradient of 100% solvent A/0% solvent B to 0% solvent A/100% solvent B, a gradient time of 2 min, a hold time of 1 min, and an analysis time of 3 min where solvent A was 5% acetonitrile/95% H2O/10 mM ammonium acetate and solvent B was 5% H2O/95% acetonitrile/10 mM ammonium acetate. MS data was determined using a Micromass Platform for LC in electrospray mode.

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