N-bromobutanimide → Methyl 3-(3-bromo-2-(4-fluorophenyl)furo[2,3-b]pyridin-5-yl)-4-methylbenzoate

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The reaction flask was wrapped in aluminum foil. NBS (175 mg, 0.983 mmol) was added to a stirring solution of methyl 3-(2-(4-fluorophenyl)furo[2,3-b]pyridin-5-yl)-4-methylbenzoate (289 mg, 0.800 mmol) in dichloroethane (8 mL) at room temperature. It was allowed to stir overnight. The mixture was diluted with EtOAc and quenched with 10% sodium metabisulfate and washed with sat NaCl. The organic phase was dried over Na2SO4, filtered and concentrated was purified on silica gel (Biotage, EtOAc/hexanes gradient, fraction collection at λ=254 nm) the expected product consistent by LCMS and NMR. 1H NMR (400 MHz, DMSO-d6) δ ppm 8.41 (1H, d, J=2.01 Hz), 8.16-8.26 (2H, m), 8.06 (1H, d, J=2.26 Hz), 7.95 (1H, dd, J=8.03, 1.76 Hz), 7.87 (1H, d), 7.45-7.57 (3 H, m), 3.86 (3H, s), 2.34 (3H, s). LC-MS retention time: 2.85 min; m/z (MH+): 440, 442. LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a Waters SunFire 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 3 min, a hold time of 1 min, and an analysis time of 4 min where solvent A was 10% acetonitrile/90% H2O/0.1% trifluoroacetic acid and solvent B was 10% H2O/90% acetonitrile/0.1% trifluoroacetic acid. MS data was determined using a Micromass Platform for LC in electrospray mode.

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